53 files changed, 2725 insertions, 1688 deletions

diff --git a/OpenSim/Region/ClientStack/Linden/Caps/EventQueue/EventQueueGetModule.cs b/OpenSim/Region/ClientStack/Linden/Caps/EventQueue/EventQueueGetModule.cs
index ca6c3ca..51535a6 100644
--- a/OpenSim/Region/ClientStack/Linden/Caps/EventQueue/EventQueueGetModule.cs
+++ b/OpenSim/Region/ClientStack/Linden/Caps/EventQueue/EventQueueGetModule.cs
@@ -59,6 +59,7 @@ namespace OpenSim.Region.ClientStack.Linden
     public class EventQueueGetModule : IEventQueue, INonSharedRegionModule
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static string LogHeader = "[EVENT QUEUE GET MODULE]";
 
         /// <value>
         /// Debug level.
@@ -479,7 +480,7 @@ namespace OpenSim.Region.ClientStack.Linden
         public virtual void EnableSimulator(ulong handle, IPEndPoint endPoint, UUID avatarID, int regionSizeX, int regionSizeY)
         {
             m_log.DebugFormat("{0} EnableSimulator. handle={1}, avatarID={2}, regionSize={3},{4}>",
-                "[EVENT QUEUE GET MODULE]", handle, avatarID, regionSizeX, regionSizeY);
+                LogHeader, handle, avatarID, regionSizeX, regionSizeY);
 
             OSD item = EventQueueHelper.EnableSimulator(handle, endPoint, regionSizeX, regionSizeY);
             Enqueue(item, avatarID);
@@ -489,7 +490,7 @@ namespace OpenSim.Region.ClientStack.Linden
                                 ulong regionHandle, int regionSizeX, int regionSizeY) 
         {
             m_log.DebugFormat("{0} EstablishAgentCommunication. handle={1}, avatarID={2}, regionSize={3},{4}>",
-                "[EVENT QUEUE GET MODULE]", regionHandle, avatarID, regionSizeX, regionSizeY);
+                LogHeader, regionHandle, avatarID, regionSizeX, regionSizeY);
             OSD item = EventQueueHelper.EstablishAgentCommunication(avatarID, endPoint.ToString(), capsPath, regionHandle, regionSizeX, regionSizeY);
             Enqueue(item, avatarID);
         }
@@ -500,7 +501,7 @@ namespace OpenSim.Region.ClientStack.Linden
                                         UUID avatarID, int regionSizeX, int regionSizeY)
         {
             m_log.DebugFormat("{0} TeleportFinishEvent. handle={1}, avatarID={2}, regionSize={3},{4}>",
-                "[EVENT QUEUE GET MODULE]", regionHandle, avatarID, regionSizeX, regionSizeY);
+                LogHeader, regionHandle, avatarID, regionSizeX, regionSizeY);
 
             OSD item = EventQueueHelper.TeleportFinishEvent(regionHandle, simAccess, regionExternalEndPoint,
                                                             locationID, flags, capsURL, avatarID, regionSizeX, regionSizeY);
@@ -512,7 +513,7 @@ namespace OpenSim.Region.ClientStack.Linden
                                 string capsURL, UUID avatarID, UUID sessionID, int regionSizeX, int regionSizeY)
         {
             m_log.DebugFormat("{0} CrossRegion. handle={1}, avatarID={2}, regionSize={3},{4}>",
-                "[EVENT QUEUE GET MODULE]", handle, avatarID, regionSizeX, regionSizeY);
+                LogHeader, handle, avatarID, regionSizeX, regionSizeY);
 
             OSD item = EventQueueHelper.CrossRegion(handle, pos, lookAt, newRegionExternalEndPoint,
                                                     capsURL, avatarID, sessionID, regionSizeX, regionSizeY);
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
index 7b6889a..226f2a1 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
@@ -312,6 +312,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         private const float m_sunPainDaHalfOrbitalCutoff = 4.712388980384689858f;
 
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static string LogHeader = "[LLCLIENTVIEW]";
         protected static Dictionary<PacketType, PacketMethod> PacketHandlers = new Dictionary<PacketType, PacketMethod>(); //Global/static handlers for all clients
 
         /// <summary>
@@ -692,12 +693,36 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// <returns>true if the handler was added.  This is currently always the case.</returns>
         public bool AddLocalPacketHandler(PacketType packetType, PacketMethod handler, bool doAsync)
         {
+            return AddLocalPacketHandler(packetType, handler, doAsync, false);
+        }
+
+        /// <summary>
+        /// Add a handler for the given packet type.
+        /// </summary>
+        /// <param name="packetType"></param>
+        /// <param name="handler"></param>
+        /// <param name="doAsync">
+        /// If true, when the packet is received handle it on a different thread.  Whether this is given direct to 
+        /// a threadpool thread or placed in a queue depends on the inEngine parameter.
+        /// </param>
+        /// <param name="inEngine">
+        /// If async is false then this parameter is ignored.
+        /// If async is true and inEngine is false, then the packet is sent directly to a
+        /// threadpool thread. 
+        /// If async is true and inEngine is true, then the packet is sent to the IncomingPacketAsyncHandlingEngine.
+        /// This may result in slower handling but reduces the risk of overloading the simulator when there are many
+        /// simultaneous async requests.
+        /// </param>
+        /// <returns>true if the handler was added.  This is currently always the case.</returns>
+        public bool AddLocalPacketHandler(PacketType packetType, PacketMethod handler, bool doAsync, bool inEngine)
+        {
             bool result = false;
             lock (m_packetHandlers)
             {
                 if (!m_packetHandlers.ContainsKey(packetType))
                 {
-                    m_packetHandlers.Add(packetType, new PacketProcessor() { method = handler, Async = doAsync });
+                    m_packetHandlers.Add(
+                        packetType, new PacketProcessor() { method = handler, Async = doAsync });
                     result = true;
                 }
             }
@@ -1176,11 +1201,14 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
         /// <summary>
         ///  Send the region heightmap to the client
+        ///  This method is only called when not doing intellegent terrain patch sending and
+        ///  is only called when the scene presence is initially created and sends all of the
+        ///  region's patches to the client.
         /// </summary>
         /// <param name="map">heightmap</param>
         public virtual void SendLayerData(float[] map)
         {
-            Util.FireAndForget(DoSendLayerData, map);
+            Util.FireAndForget(DoSendLayerData, m_scene.Heightmap.GetTerrainData());
 
             // Send it sync, and async. It's not that much data
             // and it improves user experience just so much!
@@ -1193,15 +1221,16 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// <param name="o"></param>
         private void DoSendLayerData(object o)
         {
-            float[] map = LLHeightFieldMoronize((float[])o);
+            TerrainData map = (TerrainData)o;
 
             try
             {
+                // Send LayerData in typerwriter pattern
                 for (int y = 0; y < 16; y++)
                 {
-                    for (int x = 0; x < 16; x+=4)
+                    for (int x = 0; x < 16; x++)
                     {
-                        SendLayerPacket(x, y, map);
+                        SendLayerData(x, y, map);
                     }
                 }
             }
@@ -1211,77 +1240,95 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             }
         }
 
-        /// <summary>
-        /// Sends a set of four patches (x, x+1, ..., x+3) to the client
-        /// </summary>
-        /// <param name="map">heightmap</param>
-        /// <param name="px">X coordinate for patches 0..12</param>
-        /// <param name="py">Y coordinate for patches 0..15</param>
-        private void SendLayerPacket(int x, int y, float[] map)
+        // Legacy form of invocation that passes around a bare data array.
+        // Just ignore what was passed and use the real terrain info that is part of the scene.
+        // As a HORRIBLE kludge in an attempt to not change the definition of IClientAPI, 
+        //    there is a special form for specifying multiple terrain patches to send.
+        //    The form is to pass 'px' as negative the number of patches to send and to
+        //    pass the float array as pairs of patch X and Y coordinates. So, passing 'px'
+        //    as -2 and map= [3, 5, 8, 4] would mean to send two terrain heightmap patches
+        //    and the patches to send are <3,5> and <8,4>.
+        public void SendLayerData(int px, int py, float[] map)
         {
-            int[] patches = new int[4];
-            patches[0] = x + 0 + y * 16;
-            patches[1] = x + 1 + y * 16;
-            patches[2] = x + 2 + y * 16;
-            patches[3] = x + 3 + y * 16;
+            if (px >= 0)
+            {
+                SendLayerData(px, py, m_scene.Heightmap.GetTerrainData());
+            }
+            else
+            {
+                int numPatches = -px;
+                int[] xPatches = new int[numPatches];
+                int[] yPatches = new int[numPatches];
+                for (int pp = 0; pp < numPatches; pp++)
+                {
+                    xPatches[pp] = (int)map[pp * 2];
+                    yPatches[pp] = (int)map[pp * 2 + 1];
+                }
 
-            float[] heightmap = (map.Length == 65536) ?
-                map :
-                LLHeightFieldMoronize(map);
+                // DebugSendingPatches("SendLayerData", xPatches, yPatches);
 
-            try
-            {
-                Packet layerpack = TerrainCompressor.CreateLandPacket(heightmap, patches);
-                OutPacket(layerpack, ThrottleOutPacketType.Land);
+                SendLayerData(xPatches, yPatches, m_scene.Heightmap.GetTerrainData());
             }
-            catch
+        }
+
+        private void DebugSendingPatches(string pWho, int[] pX, int[] pY)
+        {
+            if (m_log.IsDebugEnabled)
             {
-                for (int px = x ; px < x + 4 ; px++)
-                    SendLayerData(px, y, map);
+                int numPatches = pX.Length;
+                string Xs = "";
+                string Ys = "";
+                for (int pp = 0; pp < numPatches; pp++)
+                {
+                    Xs += String.Format("{0}", (int)pX[pp]) + ",";
+                    Ys += String.Format("{0}", (int)pY[pp]) + ",";
+                }
+                m_log.DebugFormat("{0} {1}: numPatches={2}, X={3}, Y={4}", LogHeader, pWho, numPatches, Xs, Ys);
             }
         }
 
         /// <summary>
-        /// Sends a specified patch to a client
+        /// Sends a terrain packet for the point specified.
+        /// This is a legacy call that has refarbed the terrain into a flat map of floats.
+        /// We just use the terrain from the region we know about.
         /// </summary>
         /// <param name="px">Patch coordinate (x) 0..15</param>
         /// <param name="py">Patch coordinate (y) 0..15</param>
         /// <param name="map">heightmap</param>
-        public void SendLayerData(int px, int py, float[] map)
+        public void SendLayerData(int px, int py, TerrainData terrData)
+        {
+            int[] xPatches = new[] { px };
+            int[] yPatches = new[] { py };
+            SendLayerData(xPatches, yPatches, terrData);
+        }
+
+        private void SendLayerData(int[] px, int[] py, TerrainData terrData)
         {
             try
             {
-                int[] patches = new int[] { py * 16 + px };
-                float[] heightmap = (map.Length == 65536) ?
-                    map :
-                    LLHeightFieldMoronize(map);
-
-                LayerDataPacket layerpack = TerrainCompressor.CreateLandPacket(heightmap, patches);
-                
-                // When a user edits the terrain, so much data is sent, the data queues up fast and presents a sub optimal editing experience.  
-                // To alleviate this issue, when the user edits the terrain, we start skipping the queues until they're done editing the terrain.
-                // We also make them unreliable because it's extremely likely that multiple packets will be sent for a terrain patch area 
-                // invalidating previous packets for that area.
-
-                // It's possible for an editing user to flood themselves with edited packets but the majority of use cases are such that only a 
-                // tiny percentage of users will be editing the terrain.     Other, non-editing users will see the edits much slower.
-                
-                // One last note on this topic, by the time users are going to be editing the terrain, it's extremely likely that the sim will 
-                // have rezzed already and therefore this is not likely going to cause any additional issues with lost packets, objects or terrain 
-                // patches.
+                /* test code using the terrain compressor in libOpenMetaverse
+                int[] patchInd = new int[1];
+                patchInd[0] = px + (py * Constants.TerrainPatchSize);
+                LayerDataPacket layerpack = TerrainCompressor.CreateLandPacket(terrData.GetFloatsSerialized(), patchInd);
+                 */
+                // Many, many patches could have been passed to us. Since the patches will be compressed
+                //   into variable sized blocks, we cannot pre-compute how many will fit into one
+                //   packet. While some fancy packing algorithm is possible, 4 seems to always fit.
+                int PatchesAssumedToFit = 4;
+                for (int pcnt = 0; pcnt < px.Length; pcnt += PatchesAssumedToFit)
+                {
+                    int remaining = Math.Min(px.Length - pcnt, PatchesAssumedToFit);
+                    int[] xPatches = new int[remaining];
+                    int[] yPatches = new int[remaining];
+                    for (int ii = 0; ii < remaining; ii++)
+                    {
+                        xPatches[ii] = px[pcnt + ii];
+                        yPatches[ii] = py[pcnt + ii];
+                    }
+                    LayerDataPacket layerpack = OpenSimTerrainCompressor.CreateLandPacket(terrData, xPatches, yPatches);
+                    // DebugSendingPatches("SendLayerDataInternal", xPatches, yPatches);
 
-                // m_justEditedTerrain is volatile, so test once and duplicate two affected statements so we only have one cache miss.
-                if (m_justEditedTerrain)
-                {
-                    layerpack.Header.Reliable = false;
-                    OutPacket(layerpack,
-                               ThrottleOutPacketType.Unknown );
-                }
-                else
-                {
-                    layerpack.Header.Reliable = true;
-                    OutPacket(layerpack,
-                               ThrottleOutPacketType.Task);
+                    SendTheLayerPacket(layerpack);
                 }
             }
             catch (Exception e)
@@ -1290,36 +1337,34 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             }
         }
 
-        /// <summary>
-        /// Munges heightfield into the LLUDP backed in restricted heightfield.
-        /// </summary>
-        /// <param name="map">float array in the base; Constants.RegionSize</param>
-        /// <returns>float array in the base 256</returns>
-        internal float[] LLHeightFieldMoronize(float[] map)
+        // When a user edits the terrain, so much data is sent, the data queues up fast and presents a
+        // sub optimal editing experience. To alleviate this issue, when the user edits the terrain, we
+        // start skipping the queues until they're done editing the terrain. We also make them
+        // unreliable because it's extremely likely that multiple packets will be sent for a terrain patch
+        // area invalidating previous packets for that area.
+
+        // It's possible for an editing user to flood themselves with edited packets but the majority
+        // of use cases are such that only a tiny percentage of users will be editing the terrain.
+        // Other, non-editing users will see the edits much slower.
+        
+        // One last note on this topic, by the time users are going to be editing the terrain, it's
+        // extremely likely that the sim will have rezzed already and therefore this is not likely going
+        // to cause any additional issues with lost packets, objects or terrain patches.
+
+        // m_justEditedTerrain is volatile, so test once and duplicate two affected statements so we
+        //    only have one cache miss.
+        private void SendTheLayerPacket(LayerDataPacket layerpack)
         {
-            if (map.Length == 65536)
-                return map;
+            if (m_justEditedTerrain)
+            {
+                layerpack.Header.Reliable = false;
+                OutPacket(layerpack, ThrottleOutPacketType.Unknown );
+            }
             else
             {
-                float[] returnmap = new float[65536];
-
-                if (map.Length < 65535)
-                {
-                    // rebase the vector stride to 256
-                    for (int i = 0; i < Constants.RegionSize; i++)
-                        Array.Copy(map, i * (int)Constants.RegionSize, returnmap, i * 256, (int)Constants.RegionSize);
-                }
-                else
-                {
-                    for (int i = 0; i < 256; i++)
-                        Array.Copy(map, i * (int)Constants.RegionSize, returnmap, i * 256, 256);
-                }
-
-                //Array.Copy(map,0,returnmap,0,(map.Length < 65536)? map.Length : 65536);
-
-                return returnmap;
+                layerpack.Header.Reliable = true;
+                OutPacket(layerpack, ThrottleOutPacketType.Land);
             }
-
         }
 
         /// <summary>
@@ -1348,21 +1393,22 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         {
             Vector2[] windSpeeds = (Vector2[])o;
             TerrainPatch[] patches = new TerrainPatch[2];
-            patches[0] = new TerrainPatch();
-            patches[0].Data = new float[16 * 16];
-            patches[1] = new TerrainPatch();
-            patches[1].Data = new float[16 * 16];
+            patches[0] = new TerrainPatch { Data = new float[16 * 16] };
+            patches[1] = new TerrainPatch { Data = new float[16 * 16] };
 
-            for (int y = 0; y < 16; y++)
+            for (int x = 0; x < 16 * 16; x++)
             {
-                for (int x = 0; x < 16; x++)
-                {
-                    patches[0].Data[y * 16 + x] = windSpeeds[y * 16 + x].X;
-                    patches[1].Data[y * 16 + x] = windSpeeds[y * 16 + x].Y;
-                }
+                patches[0].Data[x] = windSpeeds[x].X;
+                patches[1].Data[x] = windSpeeds[x].Y;
             }
 
-            LayerDataPacket layerpack = TerrainCompressor.CreateLayerDataPacket(patches, TerrainPatch.LayerType.Wind);
+            byte layerType = (byte)TerrainPatch.LayerType.Wind;
+            if (m_scene.RegionInfo.RegionSizeX > Constants.RegionSize || m_scene.RegionInfo.RegionSizeY > Constants.RegionSize)
+                layerType = (byte)TerrainPatch.LayerType.WindExtended;
+
+            // LayerDataPacket layerpack = TerrainCompressor.CreateLayerDataPacket(patches, (TerrainPatch.LayerType)layerType);
+            LayerDataPacket layerpack = OpenSimTerrainCompressor.CreateLayerDataPacket(patches, layerType,
+                                (int)m_scene.RegionInfo.RegionSizeX, (int)m_scene.RegionInfo.RegionSizeY);
             layerpack.Header.Zerocoded = true;
             OutPacket(layerpack, ThrottleOutPacketType.Wind);
         }
@@ -1386,7 +1432,13 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 }
             }
 
-            LayerDataPacket layerpack = TerrainCompressor.CreateLayerDataPacket(patches, TerrainPatch.LayerType.Cloud);
+            byte layerType = (byte)TerrainPatch.LayerType.Cloud;
+            if (m_scene.RegionInfo.RegionSizeX > Constants.RegionSize || m_scene.RegionInfo.RegionSizeY > Constants.RegionSize)
+                layerType = (byte)TerrainPatch.LayerType.CloudExtended;
+
+            // LayerDataPacket layerpack = TerrainCompressor.CreateLayerDataPacket(patches, (TerrainPatch.LayerType)layerType);
+            LayerDataPacket layerpack = OpenSimTerrainCompressor.CreateLayerDataPacket(patches, layerType,
+                                (int)m_scene.RegionInfo.RegionSizeX, (int)m_scene.RegionInfo.RegionSizeY);
             layerpack.Header.Zerocoded = true;
             OutPacket(layerpack, ThrottleOutPacketType.Cloud);
         }
@@ -1491,10 +1543,9 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 mapReply.Data[i].Access = mapBlocks2[i].Access;
                 mapReply.Data[i].Agents = mapBlocks2[i].Agents;
 
-                // TODO: hookup varregion sim size here
                 mapReply.Size[i] = new MapBlockReplyPacket.SizeBlock();
-                mapReply.Size[i].SizeX = 256;
-                mapReply.Size[i].SizeY = 256;
+                mapReply.Size[i].SizeX = mapBlocks2[i].SizeX;
+                mapReply.Size[i].SizeY = mapBlocks2[i].SizeY;
             }
             OutPacket(mapReply, ThrottleOutPacketType.Land);
         }
@@ -1659,15 +1710,6 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
         public void SendKillObject(List<uint> localIDs)
         {
-//            foreach (uint id in localIDs)
-//                m_log.DebugFormat("[CLIENT]: Sending KillObjectPacket to {0} for {1} in {2}", Name, id, regionHandle);
-
-            // remove pending entities
-            lock (m_entityProps.SyncRoot)
-                m_entityProps.Remove(localIDs);
-            lock (m_entityUpdates.SyncRoot)
-                m_entityUpdates.Remove(localIDs);
-
             KillObjectPacket kill = (KillObjectPacket)PacketPool.Instance.GetPacket(PacketType.KillObject);
             // TODO: don't create new blocks if recycling an old packet
             kill.ObjectData = new KillObjectPacket.ObjectDataBlock[localIDs.Count];
@@ -9093,6 +9135,19 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             TeleportLocationRequest handlerTeleportLocationRequest = OnTeleportLocationRequest;
             if (handlerTeleportLocationRequest != null)
             {
+                // Adjust teleport location to base of a larger region if requested to teleport to a sub-region
+                uint locX, locY;
+                Util.RegionHandleToWorldLoc(tpLocReq.Info.RegionHandle, out locX, out locY);
+                if ((locX >= m_scene.RegionInfo.WorldLocX)
+                            && (locX < (m_scene.RegionInfo.WorldLocX + m_scene.RegionInfo.RegionSizeX))
+                            && (locY >= m_scene.RegionInfo.WorldLocY)
+                            && (locY < (m_scene.RegionInfo.WorldLocY + m_scene.RegionInfo.RegionSizeY)) )
+                {
+                    tpLocReq.Info.RegionHandle = m_scene.RegionInfo.RegionHandle;
+                    tpLocReq.Info.Position.X += locX - m_scene.RegionInfo.WorldLocX;
+                    tpLocReq.Info.Position.Y += locY - m_scene.RegionInfo.WorldLocY;
+                }
+
                 handlerTeleportLocationRequest(this, tpLocReq.Info.RegionHandle, tpLocReq.Info.Position,
                                                tpLocReq.Info.LookAt, 16);
             }
diff --git a/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs b/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs
index dcfc630..9d70063 100644
--- a/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs
@@ -213,8 +213,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
             IScene scene = c.Scene;
             UUID destination = c.Destination;
             Vector3 fromPos = c.Position;
-            Vector3 regionPos = new Vector3(scene.RegionInfo.RegionLocX * Constants.RegionSize,
-                                            scene.RegionInfo.RegionLocY * Constants.RegionSize, 0);
+            Vector3 regionPos = new Vector3(scene.RegionInfo.WorldLocX, scene.RegionInfo.WorldLocY, 0);
 
             bool checkParcelHide = false;
             UUID sourceParcelID = UUID.Zero;
@@ -424,8 +423,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
             {
                 Vector3 fromRegionPos = fromPos + regionPos;
                 Vector3 toRegionPos = presence.AbsolutePosition +
-                    new Vector3(presence.Scene.RegionInfo.RegionLocX * Constants.RegionSize,
-                                presence.Scene.RegionInfo.RegionLocY * Constants.RegionSize, 0);
+                    new Vector3(presence.Scene.RegionInfo.WorldLocX, presence.Scene.RegionInfo.WorldLocY, 0);
 
                 int dis = (int)Util.GetDistanceTo(toRegionPos, fromRegionPos);
 
diff --git a/OpenSim/Region/CoreModules/Avatar/UserProfiles/UserProfileModule.cs b/OpenSim/Region/CoreModules/Avatar/UserProfiles/UserProfileModule.cs
index db8405b..7177d9b 100644
--- a/OpenSim/Region/CoreModules/Avatar/UserProfiles/UserProfileModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/UserProfiles/UserProfileModule.cs
@@ -663,8 +663,8 @@ namespace OpenSim.Region.OptionalModules.Avatar.UserProfiles
 
             Vector3 avaPos = p.AbsolutePosition;
             // Getting the global position for the Avatar
-            Vector3 posGlobal = new Vector3(remoteClient.Scene.RegionInfo.RegionLocX*Constants.RegionSize + avaPos.X,
-                                            remoteClient.Scene.RegionInfo.RegionLocY*Constants.RegionSize + avaPos.Y,
+            Vector3 posGlobal = new Vector3(remoteClient.Scene.RegionInfo.WorldLocX + avaPos.X,
+                                            remoteClient.Scene.RegionInfo.WorldLocY + avaPos.Y,
                                             avaPos.Z);
 
             string landOwnerName = string.Empty;
@@ -1353,4 +1353,4 @@ namespace OpenSim.Region.OptionalModules.Avatar.UserProfiles
         }
         #endregion Web Util
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/CoreModules/Framework/Caps/CapabilitiesModule.cs b/OpenSim/Region/CoreModules/Framework/Caps/CapabilitiesModule.cs
index 6e0fd03..f615c6b 100644
--- a/OpenSim/Region/CoreModules/Framework/Caps/CapabilitiesModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/Caps/CapabilitiesModule.cs
@@ -317,9 +317,7 @@ namespace OpenSim.Region.CoreModules.Framework
                 foreach (KeyValuePair<ulong, string> kvp in m_childrenSeeds[agentID])
                 {
                     uint x, y;
-                    Utils.LongToUInts(kvp.Key, out x, out y);
-                    x = x / Constants.RegionSize;
-                    y = y / Constants.RegionSize;
+                    Util.RegionHandleToRegionLoc(kvp.Key, out x, out y);
                     m_log.Info(" >> "+x+", "+y+": "+kvp.Value);
                 }
             }
diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index b32a169..c81e5aa 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -121,8 +121,57 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         /// </summary>
         private EntityTransferStateMachine m_entityTransferStateMachine;
 
-        private ExpiringCache<UUID, ExpiringCache<ulong, DateTime>> m_bannedRegions =
-                new ExpiringCache<UUID, ExpiringCache<ulong, DateTime>>();
+        // For performance, we keed a cached of banned regions so we don't keep going
+        //    to the grid service.
+        private class BannedRegionCache
+        {
+            private ExpiringCache<UUID, ExpiringCache<ulong, DateTime>> m_bannedRegions =
+                    new ExpiringCache<UUID, ExpiringCache<ulong, DateTime>>();
+            ExpiringCache<ulong, DateTime> m_idCache;
+            DateTime m_banUntil;
+            public BannedRegionCache()
+            {
+            }
+            // Return 'true' if there is a valid ban entry for this agent in this region
+            public bool IfBanned(ulong pRegionHandle, UUID pAgentID)
+            {
+                bool ret = false;
+                if (m_bannedRegions.TryGetValue(pAgentID, out m_idCache))
+                {
+                    if (m_idCache.TryGetValue(pRegionHandle, out m_banUntil))
+                    {
+                        if (DateTime.Now < m_banUntil)
+                        {
+                            ret = true;
+                        }
+                    }
+                }
+                return ret;
+            }
+            // Add this agent in this region as a banned person
+            public void Add(ulong pRegionHandle, UUID pAgentID)
+            {
+                this.Add(pRegionHandle, pAgentID, 45, 15);
+            }
+            public void Add(ulong pRegionHandle, UUID pAgentID, double newTime, double extendTime)
+            {
+                if (!m_bannedRegions.TryGetValue(pAgentID, out m_idCache))
+                {
+                    m_idCache = new ExpiringCache<ulong, DateTime>();
+                    m_bannedRegions.Add(pAgentID, m_idCache, TimeSpan.FromSeconds(newTime));
+                }
+                m_idCache.Add(pRegionHandle, DateTime.Now + TimeSpan.FromSeconds(extendTime), TimeSpan.FromSeconds(extendTime));
+            }
+            // Remove the agent from the region's banned list
+            public void Remove(ulong pRegionHandle, UUID pAgentID)
+            {
+                if (m_bannedRegions.TryGetValue(pAgentID, out m_idCache))
+                {
+                    m_idCache.Remove(pRegionHandle);
+                }
+            }
+        }
+        private BannedRegionCache m_bannedRegionCache = new BannedRegionCache();
 
         private IEventQueue m_eqModule;
         private IRegionCombinerModule m_regionCombinerModule;
@@ -337,6 +386,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 "[ENTITY TRANSFER MODULE]: Received teleport cancel request from {0} in {1}", client.Name, Scene.Name);
         }
 
+        // Attempt to teleport the ScenePresence to the specified position in the specified region (spec'ed by its handle).
         public void Teleport(ScenePresence sp, ulong regionHandle, Vector3 position, Vector3 lookAt, uint teleportFlags)
         {
             if (sp.Scene.Permissions.IsGridGod(sp.UUID))
@@ -418,7 +468,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 sp.Name, position, sp.Scene.RegionInfo.RegionName);
 
             // Teleport within the same region
-            if (IsOutsideRegion(sp.Scene, position) || position.Z < 0)
+            if (!sp.Scene.PositionIsInCurrentRegion(position) || position.Z < 0)
             {
                 Vector3 emergencyPos = new Vector3(128, 128, 128);
 
@@ -437,10 +487,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             float posZLimit = 22;
 
             // TODO: Check other Scene HeightField
-            if (position.X > 0 && position.X <= (int)Constants.RegionSize && position.Y > 0 && position.Y <= (int)Constants.RegionSize)
-            {
-                posZLimit = (float)sp.Scene.Heightmap[(int)position.X, (int)position.Y];
-            }
+            posZLimit = (float)sp.Scene.Heightmap[(int)position.X, (int)position.Y];
 
             posZLimit += localHalfAVHeight + 0.1f;
 
@@ -484,9 +531,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             ScenePresence sp, ulong regionHandle, Vector3 position,
             Vector3 lookAt, uint teleportFlags, out GridRegion finalDestination)
         {
-            uint x = 0, y = 0;
-            Utils.LongToUInts(regionHandle, out x, out y);
-            GridRegion reg = Scene.GridService.GetRegionByPosition(sp.Scene.RegionInfo.ScopeID, (int)x, (int)y);
+            // Get destination region taking into account that the address could be an offset
+            //     region inside a varregion.
+            GridRegion reg = GetTeleportDestinationRegion(sp.Scene.GridService, sp.Scene.RegionInfo.ScopeID, regionHandle, ref position);
 
             if (reg != null)
             {
@@ -537,12 +584,12 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
                 // and set the map-tile to '(Offline)'
                 uint regX, regY;
-                Utils.LongToUInts(regionHandle, out regX, out regY);
+                Util.RegionHandleToRegionLoc(regionHandle, out regX, out regY);
 
                 MapBlockData block = new MapBlockData();
-                block.X = (ushort)(regX / Constants.RegionSize);
-                block.Y = (ushort)(regY / Constants.RegionSize);
-                block.Access = 254; // == not there
+                block.X = (ushort)(regX);
+                block.Y = (ushort)(regY);
+                block.Access = (byte)SimAccess.Down; // == not there
 
                 List<MapBlockData> blocks = new List<MapBlockData>();
                 blocks.Add(block);
@@ -550,6 +597,31 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             }
         }
 
+        // The teleport address could be an address in a subregion of a larger varregion.
+        // Find the real base region and adjust the teleport location to account for the
+        //    larger region.
+        private GridRegion GetTeleportDestinationRegion(IGridService gridService, UUID scope, ulong regionHandle, ref Vector3 position)
+        {
+            uint x = 0, y = 0;
+            Util.RegionHandleToWorldLoc(regionHandle, out x, out y);
+
+            // Compute the world location we're teleporting to
+            double worldX = (double)x + position.X;
+            double worldY = (double)y + position.Y;
+
+            // Find the region that contains the position
+            GridRegion reg = GetRegionContainingWorldLocation(gridService, scope, worldX, worldY);
+
+            if (reg != null)
+            {
+                // modify the position for the offset into the actual region returned
+                position.X += x - reg.RegionLocX;
+                position.Y += y - reg.RegionLocY;
+            }
+
+            return reg;
+        }
+
         // Nothing to validate here
         protected virtual bool ValidateGenericConditions(ScenePresence sp, GridRegion reg, GridRegion finalDestination, uint teleportFlags, out string reason)
         {
@@ -650,10 +722,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 return;
             }
 
-            uint newRegionX = (uint)(reg.RegionHandle >> 40);
-            uint newRegionY = (((uint)(reg.RegionHandle)) >> 8);
-            uint oldRegionX = (uint)(sp.Scene.RegionInfo.RegionHandle >> 40);
-            uint oldRegionY = (((uint)(sp.Scene.RegionInfo.RegionHandle)) >> 8);
+            uint newRegionX, newRegionY, oldRegionX, oldRegionY;
+            Util.RegionHandleToRegionLoc(reg.RegionHandle, out newRegionX, out newRegionY);
+            Util.RegionHandleToRegionLoc(sp.Scene.RegionInfo.RegionHandle, out oldRegionX, out oldRegionY);
 
             ulong destinationHandle = finalDestination.RegionHandle;
 
@@ -675,8 +746,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             string reason;
             string version;
+            string myversion = string.Format("{0}/{1}", OutgoingTransferVersionName, MaxOutgoingTransferVersion);
             if (!Scene.SimulationService.QueryAccess(
-                finalDestination, sp.ControllingClient.AgentId, Vector3.Zero, out version, out reason))
+                finalDestination, sp.ControllingClient.AgentId, position, out version, out reason))
             {
                 sp.ControllingClient.SendTeleportFailed(reason);
 
@@ -1274,6 +1346,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             return region;
         }
 
+        // This returns 'true' if the new region already has a child agent for our
+        //    incoming agent. The implication is that, if 'false', we have to create  the
+        //    child and then teleport into the region.
         protected virtual bool NeedsNewAgent(float drawdist, uint oldRegionX, uint newRegionX, uint oldRegionY, uint newRegionY)
         {
             if (m_regionCombinerModule != null && m_regionCombinerModule.IsRootForMegaregion(Scene.RegionInfo.RegionID))
@@ -1298,20 +1373,6 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             return Util.IsOutsideView(drawdist, oldRegionX, newRegionX, oldRegionY, newRegionY);
         }
 
-        protected virtual bool IsOutsideRegion(Scene s, Vector3 pos)
-        {
-            if (s.TestBorderCross(pos, Cardinals.N))
-                return true;
-            if (s.TestBorderCross(pos, Cardinals.S))
-                return true;
-            if (s.TestBorderCross(pos, Cardinals.E))
-                return true;
-            if (s.TestBorderCross(pos, Cardinals.W))
-                return true;
-
-            return false;
-        }
-
         #endregion
 
         #region Landmark Teleport
@@ -1398,42 +1459,20 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             UUID agentID = agent.UUID;
             ulong destinyHandle = destiny.RegionHandle;
 
-            ExpiringCache<ulong, DateTime> r;
-            DateTime banUntil;
-            if (m_bannedRegions.TryGetValue(agentID, out r))
+            if (m_bannedRegionCache.IfBanned(destinyHandle, agentID))
             {
-                if (r.TryGetValue(destinyHandle, out banUntil))
-                {
-                    if (DateTime.Now < banUntil)
-                    {
-                        reason = "Cannot connect to region";
-                        return false;
-                    }
-                    r.Remove(destinyHandle);
-                }
-            }
-            else
-            {
-                r = null;
+                reason = "Cannot connect to region";
+                return false;
             }
 
             Scene ascene = agent.Scene;
 
             if (!ascene.SimulationService.QueryAccess(destiny, agentID, position, out version, out reason))
             {
-                if (r == null)
-                {
-                    r = new ExpiringCache<ulong, DateTime>();
-                    r.Add(destinyHandle, DateTime.Now + TimeSpan.FromSeconds(30), TimeSpan.FromSeconds(30));
-
-                    m_bannedRegions.Add(agentID, r, TimeSpan.FromSeconds(30));
-                }
-                else
-                {
-                    r.Add(destinyHandle, DateTime.Now + TimeSpan.FromSeconds(30), TimeSpan.FromSeconds(30));
-                }
+                m_bannedRegionCache.Add(destinyHandle, agentID, 30.0, 30.0);
                 return false;
             }
+
             return true;
         }
 
@@ -1443,161 +1482,74 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             return GetDestination(scene, agentID, pos, out version, out newpos, out r);
         }
 
-        public GridRegion GetDestination(Scene scene, UUID agentID, Vector3 pos, out string version, out Vector3 newpos, out string reason)
+        // Given a position relative to the current region (which has previously been tested to
+        //    see that it is actually outside the current region), find the new region that the
+        //    point is actually in.
+        // Returns the coordinates and information of the new region or 'null' of it doesn't exist.
+        public GridRegion GetDestination(Scene scene, UUID agentID, Vector3 pos,
+                                            out string version, out Vector3 newpos, out string failureReason)
         {
             version = String.Empty;
-            reason = String.Empty;
             newpos = pos;
+            failureReason = string.Empty;
 
 //            m_log.DebugFormat(
 //                "[ENTITY TRANSFER MODULE]: Crossing agent {0} at pos {1} in {2}", agent.Name, pos, scene.Name);
 
-            RegionInfo regInfo = scene.RegionInfo;
-
-            uint neighbourx = regInfo.RegionLocX;
-            uint neighboury = regInfo.RegionLocY;
-            const float boundaryDistance = 0.7f;
+            // Compute world location of the object's position
+            double presenceWorldX = (double)scene.RegionInfo.WorldLocX + pos.X;
+            double presenceWorldY = (double)scene.RegionInfo.WorldLocY + pos.Y;
 
-/*
-            Vector3 northCross = new Vector3(0, boundaryDistance, 0);
-            Vector3 southCross = new Vector3(0, -1 * boundaryDistance, 0);
-            Vector3 eastCross = new Vector3(boundaryDistance, 0, 0);
-            Vector3 westCross = new Vector3(-1 * boundaryDistance, 0, 0);
-
-            // distance into new region to place avatar
-            const float enterDistance = 0.5f;
-            const float maxX = Constants.RegionSize - enterDistance;
-            const float maxY = Constants.RegionSize - enterDistance;
-
-            if (scene.TestBorderCross(pos + westCross, Cardinals.W))
-            {
-                if (scene.TestBorderCross(pos + northCross, Cardinals.N))
-                {
-                    Border b = scene.GetCrossedBorder(pos + northCross, Cardinals.N);
-                    neighboury += (uint)(int)(b.BorderLine.Z / (int)Constants.RegionSize);
-                    newpos.Y -= Constants.RegionSize;
-                }
-                else if (scene.TestBorderCross(pos + southCross, Cardinals.S))
-                {
-                    neighboury--;
-                    newpos.Y += Constants.RegionSize;
-                }
+            // Call the grid service to lookup the region containing the new position.
+            GridRegion neighbourRegion = GetRegionContainingWorldLocation(scene.GridService, scene.RegionInfo.ScopeID,
+                                                        presenceWorldX, presenceWorldY, 
+                                                        Math.Max(scene.RegionInfo.RegionSizeX, scene.RegionInfo.RegionSizeY));
 
-                neighbourx--;
-                newpos.X += Constants.RegionSize;
-            }
-            else if (scene.TestBorderCross(pos + eastCross, Cardinals.E))
+            if (neighbourRegion != null)
             {
-                Border b = scene.GetCrossedBorder(pos + eastCross, Cardinals.E);
-                neighbourx += (uint)(int)(b.BorderLine.Z / (int)Constants.RegionSize);
-                newpos.X -= Constants.RegionSize;
+                // Compute the entity's position relative to the new region
+                newpos = new Vector3((float)(presenceWorldX - (double)neighbourRegion.RegionLocX),
+                                      (float)(presenceWorldY - (double)neighbourRegion.RegionLocY),
+                                      pos.Z);
 
-                if (scene.TestBorderCross(pos + southCross, Cardinals.S))
+                if (m_bannedRegionCache.IfBanned(neighbourRegion.RegionHandle, agentID))
                 {
-                    neighboury--;
-                    newpos.Y += Constants.RegionSize;
+                    failureReason = "Cannot region cross into banned parcel";
+                    neighbourRegion = null;
                 }
-                else if (scene.TestBorderCross(pos + northCross, Cardinals.N))
+                else
                 {
-                    Border c = scene.GetCrossedBorder(pos + northCross, Cardinals.N);
-                    neighboury += (uint)(int)(c.BorderLine.Z / (int)Constants.RegionSize);
-                    newpos.Y -= Constants.RegionSize;
+                    // If not banned, make sure this agent is not in the list.
+                    m_bannedRegionCache.Remove(neighbourRegion.RegionHandle, agentID);
                 }
-            }
-            else if (scene.TestBorderCross(pos + southCross, Cardinals.S))
-            {
-                Border b = scene.GetCrossedBorder(pos + southCross, Cardinals.S);
-                neighboury--;
-                newpos.Y += Constants.RegionSize;
-            }
-            else if (scene.TestBorderCross(pos + northCross, Cardinals.N))
-            {
-                Border b = scene.GetCrossedBorder(pos + northCross, Cardinals.N);
-                neighboury += (uint)(int)(b.BorderLine.Z / (int)Constants.RegionSize);
-                newpos.Y -= Constants.RegionSize;
-            }
-
-            newpos.X = Util.Clamp(newpos.X, enterDistance, maxX);
-            newpos.Y = Util.Clamp(newpos.Y, enterDistance, maxY);
-*/
-            float regionSizeX = regInfo.RegionSizeX;
-            float regionSizeY = regInfo.RegionSizeY;
-
-            if (pos.X < boundaryDistance)
-                neighbourx--;
-            else if (pos.X > regionSizeX - boundaryDistance)
-                neighbourx += (uint)(regionSizeX / Constants.RegionSize);
 
-            if (pos.Y < boundaryDistance)
-                neighboury--;
-            else if (pos.Y > regionSizeY - boundaryDistance)
-                neighboury += (uint)(regionSizeY / Constants.RegionSize);
-
-            int x = (int)(neighbourx * Constants.RegionSize);
-            int y = (int)(neighboury * Constants.RegionSize);
-
-            ulong neighbourHandle = Utils.UIntsToLong((uint)x, (uint)y);
-
-            ExpiringCache<ulong, DateTime> r;
-            DateTime banUntil;
-
-            if (m_bannedRegions.TryGetValue(agentID, out r))
-            {
-                if (r.TryGetValue(neighbourHandle, out banUntil))
+                // Check to see if we have access to the target region.
+                string myversion = string.Format("{0}/{1}", OutgoingTransferVersionName, MaxOutgoingTransferVersion);
+                if (neighbourRegion != null
+                    && !scene.SimulationService.QueryAccess(neighbourRegion, agentID, newpos, out version, out failureReason))
                 {
-                    if (DateTime.Now < banUntil)
-                        return null;
-                    r.Remove(neighbourHandle);
+                    // remember banned
+                    m_bannedRegionCache.Add(neighbourRegion.RegionHandle, agentID);
+                    neighbourRegion = null;
                 }
             }
             else
             {
-                r = null;
+                // The destination region just doesn't exist
+                failureReason = "Cannot cross into non-existent region";
             }
 
-            GridRegion neighbourRegion = scene.GridService.GetRegionByPosition(scene.RegionInfo.ScopeID, (int)x, (int)y);
             if (neighbourRegion == null)
-            {
-                reason = "";
-                return null;
-            }
-
-            float newRegionSizeX = neighbourRegion.RegionSizeX;
-            float newRegionSizeY = neighbourRegion.RegionSizeY;
-            if (newRegionSizeX == 0)
-                newRegionSizeX = Constants.RegionSize;
-            if (newRegionSizeY == 0)
-                newRegionSizeY = Constants.RegionSize;
-
-            if (pos.X < boundaryDistance)
-                newpos.X += newRegionSizeX;
-            else if (pos.X > regionSizeX - boundaryDistance)
-                newpos.X -= regionSizeX;
-
-            if (pos.Y < boundaryDistance)
-                newpos.Y += newRegionSizeY;
-            else if (pos.Y > regionSizeY - boundaryDistance)
-                newpos.Y -= regionSizeY;
-
-            const float enterDistance = 0.5f;
-            newpos.X = Util.Clamp(newpos.X, enterDistance, newRegionSizeX - enterDistance);
-            newpos.Y = Util.Clamp(newpos.Y, enterDistance, newRegionSizeY - enterDistance);
-           
-            if (!scene.SimulationService.QueryAccess(neighbourRegion, agentID, newpos, out version, out reason))
-            {
-                if (r == null)
-                {
-                    r = new ExpiringCache<ulong, DateTime>();
-                    r.Add(neighbourHandle, DateTime.Now + TimeSpan.FromSeconds(15), TimeSpan.FromSeconds(15));
-
-                    m_bannedRegions.Add(agentID, r, TimeSpan.FromSeconds(45));
-                }
-                else
-                {
-                    r.Add(neighbourHandle, DateTime.Now + TimeSpan.FromSeconds(15), TimeSpan.FromSeconds(15));
-                }
-                return null;
-            }
+                m_log.DebugFormat("{0} GetDestination: region not found. Old region name={1} at <{2},{3}> of size <{4},{5}>. Old pos={6}",
+                    LogHeader, scene.RegionInfo.RegionName,
+                    scene.RegionInfo.RegionLocX, scene.RegionInfo.RegionLocY,
+                    scene.RegionInfo.RegionSizeX, scene.RegionInfo.RegionSizeY,
+                    pos);
+            else
+                m_log.DebugFormat("{0} GetDestination: new region={1} at <{2},{3}> of size <{4},{5}>, newpos=<{6},{7}>",
+                    LogHeader, neighbourRegion.RegionName,
+                    neighbourRegion.RegionLocX, neighbourRegion.RegionLocY, neighbourRegion.RegionSizeX, neighbourRegion.RegionSizeY,
+                    newpos.X, newpos.Y);
 
             return neighbourRegion;
         }
@@ -1632,15 +1584,16 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             uint y;
             Vector3 newpos;
             string version;
-            string reason;
+            string failureReason;
 
             Vector3 pos = agent.AbsolutePosition + agent.Velocity;
 
-            GridRegion neighbourRegion = GetDestination(agent.Scene, agent.UUID, pos, out version, out newpos, out reason);
+            GridRegion neighbourRegion = GetDestination(agent.Scene, agent.UUID, pos,
+                                                            out version, out newpos, out failureReason);
             if (neighbourRegion == null)
             {
-                if (reason != String.Empty)
-                    agent.ControllingClient.SendAlertMessage("Cannot cross to region");
+                if (failureReason != String.Empty)
+                    agent.ControllingClient.SendAlertMessage(failureReason);
                 return agent;
             }
 
@@ -1678,7 +1631,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             agent.Scene.RequestTeleportLocation(
                 agent.ControllingClient, 
-                Utils.UIntsToLong(regionX * (uint)Constants.RegionSize, regionY * (uint)Constants.RegionSize), 
+                Util.RegionLocToHandle(regionX, regionY),
                 position, 
                 agent.Lookat, 
                 (uint)Constants.TeleportFlags.ViaLocation);
@@ -1688,11 +1641,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             if (im != null)
             {
                 UUID gotoLocation = Util.BuildFakeParcelID(
-                    Util.UIntsToLong(
-                                              (regionX *
-                                               (uint)Constants.RegionSize),
-                                              (regionY *
-                                               (uint)Constants.RegionSize)),
+                    Util.RegionLocToHandle(regionX, regionY),
                     (uint)(int)position.X,
                     (uint)(int)position.Y,
                     (uint)(int)position.Z);
@@ -1745,8 +1694,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         /// Calls an asynchronous method to do so..  so it doesn't lag the sim.
         /// </summary>
         public ScenePresence CrossAgentToNewRegionAsync(
-            ScenePresence agent, Vector3 pos, GridRegion neighbourRegion,
-            bool isFlying, string version)
+                                ScenePresence agent, Vector3 pos, GridRegion neighbourRegion,
+                                bool isFlying, string version)
         {
             if (!CrossAgentToNewRegionPrep(agent, neighbourRegion))
             {
@@ -1893,11 +1842,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             // Next, let's close the child agent connections that are too far away.
             uint neighbourx;
             uint neighboury;
-
-            Utils.LongToUInts(neighbourRegion.RegionHandle, out neighbourx, out neighboury);
-
-            neighbourx /= Constants.RegionSize;
-            neighboury /= Constants.RegionSize;
+            Util.RegionHandleToRegionLoc(neighbourRegion.RegionHandle, out neighbourx, out neighboury);
 
             agent.CloseChildAgents(neighbourx, neighboury);
 
@@ -2059,7 +2004,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             if (m_regionInfo != null)
             {
-                neighbours = RequestNeighbours(sp, m_regionInfo.RegionLocX, m_regionInfo.RegionLocY);
+                neighbours = GetNeighbours(sp, m_regionInfo.RegionLocX, m_regionInfo.RegionLocY);
             }
             else
             {
@@ -2216,15 +2161,195 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             }
         }
 
+        // Computes the difference between two region bases.
+        // Returns a vector of world coordinates (meters) from base of first region to the second.
+        // The first region is the home region of the passed scene presence.
         Vector3 CalculateOffset(ScenePresence sp, GridRegion neighbour)
         {
-            int rRegionX = (int)sp.Scene.RegionInfo.RegionLocX;
-            int rRegionY = (int)sp.Scene.RegionInfo.RegionLocY;
+            /*
+            int rRegionX = (int)sp.Scene.RegionInfo.LegacyRegionLocX;
+            int rRegionY = (int)sp.Scene.RegionInfo.LegacyRegionLocY;
             int tRegionX = neighbour.RegionLocX / (int)Constants.RegionSize;
             int tRegionY = neighbour.RegionLocY / (int)Constants.RegionSize;
             int shiftx = (rRegionX - tRegionX) * (int)Constants.RegionSize;
             int shifty = (rRegionY - tRegionY) * (int)Constants.RegionSize;
             return new Vector3(shiftx, shifty, 0f);
+             */
+            return new Vector3( sp.Scene.RegionInfo.WorldLocX - neighbour.RegionLocX,
+                                sp.Scene.RegionInfo.WorldLocY - neighbour.RegionLocY,
+                                0f);
+        }
+
+        public GridRegion GetRegionContainingWorldLocation(IGridService pGridService, UUID pScopeID, double px, double py)
+        {
+            // Since we don't know how big the regions could be, we have to search a very large area
+            //    to find possible regions.
+            return GetRegionContainingWorldLocation(pGridService, pScopeID, px, py, Constants.MaximumRegionSize);
+        }
+
+        #region NotFoundLocationCache class
+        // A collection of not found locations to make future lookups 'not found' lookups quick.
+        // A simple expiring cache that keeps not found locations for some number of seconds.
+        // A 'not found' location is presumed to be anywhere in the minimum sized region that
+        //    contains that point. A conservitive estimate.
+        private class NotFoundLocationCache
+        {
+            private struct NotFoundLocation
+            {
+                public double minX, maxX, minY, maxY;
+                public DateTime expireTime;
+            }
+            private List<NotFoundLocation> m_notFoundLocations = new List<NotFoundLocation>();
+            public NotFoundLocationCache()
+            {
+            }
+            // Add an area to the list of 'not found' places. The area is the snapped region
+            //    area around the added point.
+            public void Add(double pX, double pY)
+            {
+                lock (m_notFoundLocations)
+                {
+                    if (!LockedContains(pX, pY))
+                    {
+                        NotFoundLocation nfl = new NotFoundLocation();
+                        // A not found location is not found for at least a whole region sized area
+                        nfl.minX = pX - (pX % (double)Constants.RegionSize);
+                        nfl.minY = pY - (pY % (double)Constants.RegionSize);
+                        nfl.maxX = nfl.minX + (double)Constants.RegionSize;
+                        nfl.maxY = nfl.minY + (double)Constants.RegionSize;
+                        nfl.expireTime = DateTime.Now + TimeSpan.FromSeconds(30);
+                        m_notFoundLocations.Add(nfl);
+                    }
+                }
+                
+            }
+            // Test to see of this point is in any of the 'not found' areas.
+            // Return 'true' if the point is found inside the 'not found' areas.
+            public bool Contains(double pX, double pY)
+            {
+                bool ret = false;
+                lock (m_notFoundLocations)
+                    ret = LockedContains(pX, pY);
+                return ret;
+            }
+            private bool LockedContains(double pX, double pY)
+            {
+                bool ret = false;
+                this.DoExpiration();
+                foreach (NotFoundLocation nfl in m_notFoundLocations)
+                {
+                    if (pX >= nfl.minX && pX < nfl.maxX && pY >= nfl.minY && pY < nfl.maxY)
+                    {
+                        ret = true;
+                        break;
+                    }
+                }
+                return ret;
+            }
+            private void DoExpiration()
+            {
+                List<NotFoundLocation> m_toRemove = null;
+                DateTime now = DateTime.Now;
+                foreach (NotFoundLocation nfl in m_notFoundLocations)
+                {
+                    if (nfl.expireTime < now)
+                    {
+                        if (m_toRemove == null)
+                            m_toRemove = new List<NotFoundLocation>();
+                        m_toRemove.Add(nfl);
+                    }
+                }
+                if (m_toRemove != null)
+                {
+                    foreach (NotFoundLocation nfl in m_toRemove)
+                        m_notFoundLocations.Remove(nfl);
+                    m_toRemove.Clear();
+                }
+            }
+        }
+        #endregion // NotFoundLocationCache class
+        private NotFoundLocationCache m_notFoundLocationCache = new NotFoundLocationCache();
+
+        // Given a world position (fractional meter coordinate), get the GridRegion info for
+        //   the region containing that point.
+        // Someday this should be a method on GridService.
+        // 'pSizeHint' is the size of the source region but since the destination point can be anywhere
+        //     the size of the target region is unknown thus the search area might have to be very large.
+        // Return 'null' if no such region exists.
+        public GridRegion GetRegionContainingWorldLocation(IGridService pGridService, UUID pScopeID,
+                            double px, double py, uint pSizeHint)
+        {
+            m_log.DebugFormat("{0} GetRegionContainingWorldLocation: call, XY=<{1},{2}>", LogHeader, px, py);
+            GridRegion ret = null;
+            const double fudge = 2.0;
+
+            // One problem with this routine is negative results. That is, this can be called lots of times
+            //   for regions that don't exist. m_notFoundLocationCache remembers 'not found' results so they
+            //   will be quick 'not found's next time.
+            // NotFoundLocationCache is an expiring cache so it will eventually forget about 'not found' and
+            //   thus re-ask the GridService about the location.
+            if (m_notFoundLocationCache.Contains(px, py))
+            {
+                m_log.DebugFormat("{0} GetRegionContainingWorldLocation: Not found via cache. loc=<{1},{2}>", LogHeader, px, py);
+                return null;
+            }
+
+            // As an optimization, since most regions will be legacy sized regions (256x256), first try to get
+            //   the region at the appropriate legacy region location.
+            uint possibleX = (uint)Math.Floor(px);
+            possibleX -= possibleX % Constants.RegionSize;
+            uint possibleY = (uint)Math.Floor(py);
+            possibleY -= possibleY % Constants.RegionSize;
+            ret = pGridService.GetRegionByPosition(pScopeID, (int)possibleX, (int)possibleY);
+            if (ret != null)
+            {
+                m_log.DebugFormat("{0} GetRegionContainingWorldLocation: Found region using legacy size. rloc=<{1},{2}>. Rname={3}",
+                                    LogHeader, possibleX, possibleY, ret.RegionName);
+            }
+
+            if (ret == null)
+            {
+                // If the simple lookup failed, search the larger area for a region that contains this point
+                double range = (double)pSizeHint + fudge;
+                while (ret == null && range <= (Constants.MaximumRegionSize + Constants.RegionSize))
+                {
+                    // Get from the grid service a list of regions that might contain this point.
+                    // The region origin will be in the zero direction so only subtract the range.
+                    List<GridRegion> possibleRegions = pGridService.GetRegionRange(pScopeID,
+                                        (int)(px - range), (int)(px),
+                                        (int)(py - range), (int)(py));
+                    m_log.DebugFormat("{0} GetRegionContainingWorldLocation: possibleRegions cnt={1}, range={2}",
+                                        LogHeader, possibleRegions.Count, range);
+                    if (possibleRegions != null && possibleRegions.Count > 0)
+                    {
+                        // If we found some regions, check to see if the point is within
+                        foreach (GridRegion gr in possibleRegions)
+                        {
+                            m_log.DebugFormat("{0} GetRegionContainingWorldLocation: possibleRegion nm={1}, regionLoc=<{2},{3}>, regionSize=<{4},{5}>",
+                                                LogHeader, gr.RegionName, gr.RegionLocX, gr.RegionLocY, gr.RegionSizeX, gr.RegionSizeY);
+                            if (px >= (double)gr.RegionLocX && px < (double)(gr.RegionLocX + gr.RegionSizeX)
+                                && py >= (double)gr.RegionLocY && py < (double)(gr.RegionLocY + gr.RegionSizeY))
+                            {
+                                // Found a region that contains the point
+                                ret = gr;
+                                m_log.DebugFormat("{0} GetRegionContainingWorldLocation: found. RegionName={1}", LogHeader, ret.RegionName);
+                                break;
+                            }
+                        }
+                    }
+                    // Larger search area for next time around if not found
+                    range *= 2;
+                }
+            }
+
+            if (ret == null)
+            {
+                // remember this location was not found so we can quickly not find it next time
+                m_notFoundLocationCache.Add(px, py);
+                m_log.DebugFormat("{0} GetRegionContainingWorldLocation: Not found. Remembering loc=<{1},{2}>", LogHeader, px, py);
+            }
+
+            return ret;
         }
 
         private void InformClientOfNeighbourCompleted(IAsyncResult iar)
@@ -2310,22 +2435,15 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         /// <param name='neCorner'></param>
         private void GetMegaregionViewRange(out Vector2 swCorner, out Vector2 neCorner)
         {
-            Border[] northBorders = Scene.NorthBorders.ToArray();
-            Border[] eastBorders = Scene.EastBorders.ToArray();
-
             Vector2 extent = Vector2.Zero;
-            for (int i = 0; i < eastBorders.Length; i++)
-            {
-                extent.X = (eastBorders[i].BorderLine.Z > extent.X) ? eastBorders[i].BorderLine.Z : extent.X;
-            }
-            for (int i = 0; i < northBorders.Length; i++)
+
+            if (m_regionCombinerModule != null)
             {
-                extent.Y = (northBorders[i].BorderLine.Z > extent.Y) ? northBorders[i].BorderLine.Z : extent.Y;
+                Vector2 megaRegionSize = m_regionCombinerModule.GetSizeOfMegaregion(Scene.RegionInfo.RegionID);
+                extent.X = (float)Util.WorldToRegionLoc((uint)megaRegionSize.X);
+                extent.Y = (float)Util.WorldToRegionLoc((uint)megaRegionSize.Y);
             }
 
-            // Loss of fraction on purpose
-            extent.X = ((int)extent.X / (int)Constants.RegionSize);
-            extent.Y = ((int)extent.Y / (int)Constants.RegionSize);
 
             swCorner.X = Scene.RegionInfo.RegionLocX - 1;
             swCorner.Y = Scene.RegionInfo.RegionLocY - 1;
@@ -2340,56 +2458,49 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         /// <param name="pRegionLocX"></param>
         /// <param name="pRegionLocY"></param>
         /// <returns></returns>        
-        protected List<GridRegion> RequestNeighbours(ScenePresence avatar, uint pRegionLocX, uint pRegionLocY)
+        protected List<GridRegion> GetNeighbours(ScenePresence avatar, uint pRegionLocX, uint pRegionLocY)
         {
             Scene pScene = avatar.Scene;
             RegionInfo m_regionInfo = pScene.RegionInfo;
+            List<GridRegion> neighbours;
 
             // Leaving this as a "megaregions" computation vs "non-megaregions" computation; it isn't
             // clear what should be done with a "far view" given that megaregions already extended the
             // view to include everything in the megaregion
             if (m_regionCombinerModule == null || !m_regionCombinerModule.IsRootForMegaregion(Scene.RegionInfo.RegionID))
             {
-                int dd = avatar.DrawDistance < Constants.RegionSize ? (int)Constants.RegionSize : (int)avatar.DrawDistance;
-
-                dd--;
-
-                // region center
-                int endX = (int)pRegionLocX * (int)Constants.RegionSize + (int)(Constants.RegionSize / 2);
-                int endY = (int)pRegionLocY * (int)Constants.RegionSize + (int)(Constants.RegionSize / 2);
-                
-                int startX = endX - dd;
-                int startY = endY - dd;
+                // The area to check is as big as the current region.
+                // We presume all adjacent regions are the same size as this region.
+                uint dd = Math.Max((uint)avatar.Scene.DefaultDrawDistance, 
+                                Math.Max(Scene.RegionInfo.RegionSizeX, Scene.RegionInfo.RegionSizeY));
 
-                endX +=  dd;
-                endY +=  dd;
+                uint startX = Util.RegionToWorldLoc(pRegionLocX) - dd + Constants.RegionSize/2;
+                uint startY = Util.RegionToWorldLoc(pRegionLocY) - dd + Constants.RegionSize/2;
 
-                if (startX < 0) startX = 0;
-                if (startY < 0) startY = 0;
+                uint endX = Util.RegionToWorldLoc(pRegionLocX) + dd + Constants.RegionSize/2;
+                uint endY = Util.RegionToWorldLoc(pRegionLocY) + dd + Constants.RegionSize/2;
 
-                List<GridRegion> neighbours =
-                    avatar.Scene.GridService.GetRegionRange(m_regionInfo.ScopeID, startX, endX, startY, endY);
+                neighbours
+                    = avatar.Scene.GridService.GetRegionRange(
+                        m_regionInfo.ScopeID, (int)startX, (int)endX, (int)startY, (int)endY);
 
-                neighbours.RemoveAll(delegate(GridRegion r) { return r.RegionID == m_regionInfo.RegionID; });
-                return neighbours;
             }
             else
             {
                 Vector2 swCorner, neCorner;
                 GetMegaregionViewRange(out swCorner, out neCorner);
 
-                List<GridRegion> neighbours 
+                neighbours 
                     = pScene.GridService.GetRegionRange(
                         m_regionInfo.ScopeID, 
-                        (int)swCorner.X * (int)Constants.RegionSize, 
-                        (int)neCorner.X * (int)Constants.RegionSize,
-                        (int)swCorner.Y * (int)Constants.RegionSize,
-                        (int)neCorner.Y * (int)Constants.RegionSize);
+                        (int)Util.RegionToWorldLoc((uint)swCorner.X), (int)Util.RegionToWorldLoc((uint)neCorner.X),
+                        (int)Util.RegionToWorldLoc((uint)swCorner.Y), (int)Util.RegionToWorldLoc((uint)neCorner.Y));
+            }
 
-                neighbours.RemoveAll(delegate(GridRegion r) { return r.RegionID == m_regionInfo.RegionID; });
+            // The r.RegionFlags == null check only needs to be made for simulators before 2015-01-14 (pre 0.8.1).
+            neighbours.RemoveAll( r => r.RegionID == m_regionInfo.RegionID );
 
-                return neighbours;
-            }
+            return neighbours;
         }
 /* not in use
         private List<ulong> NewNeighbours(List<ulong> currentNeighbours, List<ulong> previousNeighbours)
@@ -2509,8 +2620,10 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         ///
         /// This method locates the new region handle and offsets the prim position for the new region
         /// </summary>
-        /// <param name="attemptedPosition">the attempted out of region position of the scene object</param>
         /// <param name="grp">the scene object that we're crossing</param>
+        /// <param name="attemptedPosition">the attempted out of region position of the scene object. This position is
+        /// relative to the region the object currently is in.</param>
+        /// <param name="silent">if 'true', the deletion of the client from the region is not broadcast to the clients</param>
         public void Cross(SceneObjectGroup grp, Vector3 attemptedPosition, bool silent)
         {
             if (grp == null)
@@ -2522,209 +2635,49 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             if (scene == null)
                 return;
 
+            // Remember the old group position in case the region lookup fails so position can be restored.
+            Vector3 oldGroupPosition = grp.RootPart.GroupPosition;
 
-            int thisx = (int)scene.RegionInfo.RegionLocX;
-            int thisy = (int)scene.RegionInfo.RegionLocY;
-            Vector3 EastCross = new Vector3(0.1f, 0, 0);
-            Vector3 WestCross = new Vector3(-0.1f, 0, 0);
-            Vector3 NorthCross = new Vector3(0, 0.1f, 0);
-            Vector3 SouthCross = new Vector3(0, -0.1f, 0);
-
-
-            // use this if no borders were crossed!
-            ulong newRegionHandle
-                        = Util.UIntsToLong((uint)((thisx) * Constants.RegionSize),
-                                           (uint)((thisy) * Constants.RegionSize));
-
-            Vector3 pos = attemptedPosition;
-
-            int changeX = 1;
-            int changeY = 1;
-
-            if (scene.TestBorderCross(attemptedPosition + WestCross, Cardinals.W))
-            {
-                if (scene.TestBorderCross(attemptedPosition + SouthCross, Cardinals.S))
-                {
-
-                    Border crossedBorderx = scene.GetCrossedBorder(attemptedPosition + WestCross, Cardinals.W);
-
-                    if (crossedBorderx.BorderLine.Z > 0)
-                    {
-                        pos.X = ((pos.X + crossedBorderx.BorderLine.Z));
-                        changeX = (int)(crossedBorderx.BorderLine.Z / (int)Constants.RegionSize);
-                    }
-                    else
-                        pos.X = ((pos.X + Constants.RegionSize));
-
-                    Border crossedBordery = scene.GetCrossedBorder(attemptedPosition + SouthCross, Cardinals.S);
-                    //(crossedBorderx.BorderLine.Z / (int)Constants.RegionSize)
-
-                    if (crossedBordery.BorderLine.Z > 0)
-                    {
-                        pos.Y = ((pos.Y + crossedBordery.BorderLine.Z));
-                        changeY = (int)(crossedBordery.BorderLine.Z / (int)Constants.RegionSize);
-                    }
-                    else
-                        pos.Y = ((pos.Y + Constants.RegionSize));
-
-
-
-                    newRegionHandle
-                        = Util.UIntsToLong((uint)((thisx - changeX) * Constants.RegionSize),
-                                           (uint)((thisy - changeY) * Constants.RegionSize));
-                    // x - 1
-                    // y - 1
-                }
-                else if (scene.TestBorderCross(attemptedPosition + NorthCross, Cardinals.N))
-                {
-                    Border crossedBorderx = scene.GetCrossedBorder(attemptedPosition + WestCross, Cardinals.W);
-
-                    if (crossedBorderx.BorderLine.Z > 0)
-                    {
-                        pos.X = ((pos.X + crossedBorderx.BorderLine.Z));
-                        changeX = (int)(crossedBorderx.BorderLine.Z / (int)Constants.RegionSize);
-                    }
-                    else
-                        pos.X = ((pos.X + Constants.RegionSize));
-
-
-                    Border crossedBordery = scene.GetCrossedBorder(attemptedPosition + SouthCross, Cardinals.S);
-                    //(crossedBorderx.BorderLine.Z / (int)Constants.RegionSize)
-
-                    if (crossedBordery.BorderLine.Z > 0)
-                    {
-                        pos.Y = ((pos.Y + crossedBordery.BorderLine.Z));
-                        changeY = (int)(crossedBordery.BorderLine.Z / (int)Constants.RegionSize);
-                    }
-                    else
-                        pos.Y = ((pos.Y + Constants.RegionSize));
-
-                    newRegionHandle
-                        = Util.UIntsToLong((uint)((thisx - changeX) * Constants.RegionSize),
-                                           (uint)((thisy + changeY) * Constants.RegionSize));
-                    // x - 1
-                    // y + 1
-                }
-                else
-                {
-                    Border crossedBorderx = scene.GetCrossedBorder(attemptedPosition + WestCross, Cardinals.W);
+            // Compute the absolute position of the object.
+            double objectWorldLocX = (double)scene.RegionInfo.WorldLocX + attemptedPosition.X;
+            double objectWorldLocY = (double)scene.RegionInfo.WorldLocY + attemptedPosition.Y;
 
-                    if (crossedBorderx.BorderLine.Z > 0)
-                    {
-                        pos.X = ((pos.X + crossedBorderx.BorderLine.Z));
-                        changeX = (int)(crossedBorderx.BorderLine.Z / (int)Constants.RegionSize);
-                    }
-                    else
-                        pos.X = ((pos.X + Constants.RegionSize));
+            // Ask the grid service for the region that contains the passed address
+            GridRegion destination = GetRegionContainingWorldLocation(scene.GridService, scene.RegionInfo.ScopeID,
+                                objectWorldLocX, objectWorldLocY);
 
-                    newRegionHandle
-                        = Util.UIntsToLong((uint)((thisx - changeX) * Constants.RegionSize),
-                                           (uint)(thisy * Constants.RegionSize));
-                    // x - 1
-                }
-            }
-            else if (scene.TestBorderCross(attemptedPosition + EastCross, Cardinals.E))
+            Vector3 pos = Vector3.Zero;
+            if (destination != null)
             {
-                if (scene.TestBorderCross(attemptedPosition + SouthCross, Cardinals.S))
-                {
-
-                    pos.X = ((pos.X - Constants.RegionSize));
-                    Border crossedBordery = scene.GetCrossedBorder(attemptedPosition + SouthCross, Cardinals.S);
-                    //(crossedBorderx.BorderLine.Z / (int)Constants.RegionSize)
-
-                    if (crossedBordery.BorderLine.Z > 0)
-                    {
-                        pos.Y = ((pos.Y + crossedBordery.BorderLine.Z));
-                        changeY = (int)(crossedBordery.BorderLine.Z / (int)Constants.RegionSize);
-                    }
-                    else
-                        pos.Y = ((pos.Y + Constants.RegionSize));
-
-
-                    newRegionHandle
-                        = Util.UIntsToLong((uint)((thisx + changeX) * Constants.RegionSize),
-                                           (uint)((thisy - changeY) * Constants.RegionSize));
-                    // x + 1
-                    // y - 1
-                }
-                else if (scene.TestBorderCross(attemptedPosition + NorthCross, Cardinals.N))
-                {
-                    pos.X = ((pos.X - Constants.RegionSize));
-                    pos.Y = ((pos.Y - Constants.RegionSize));
-                    newRegionHandle
-                        = Util.UIntsToLong((uint)((thisx + changeX) * Constants.RegionSize),
-                                           (uint)((thisy + changeY) * Constants.RegionSize));
-                    // x + 1
-                    // y + 1
-                }
-                else
-                {
-                    pos.X = ((pos.X - Constants.RegionSize));
-                    newRegionHandle
-                        = Util.UIntsToLong((uint)((thisx + changeX) * Constants.RegionSize),
-                                           (uint)(thisy * Constants.RegionSize));
-                    // x + 1
-                }
+                // Adjust the object's relative position from the old region (attemptedPosition)
+                //    to be relative to the new region (pos).
+                pos = new Vector3(  (float)(objectWorldLocX - (double)destination.RegionLocX),
+                                    (float)(objectWorldLocY - (double)destination.RegionLocY),
+                                    attemptedPosition.Z);
             }
-            else if (scene.TestBorderCross(attemptedPosition + SouthCross, Cardinals.S))
-            {
-                Border crossedBordery = scene.GetCrossedBorder(attemptedPosition + SouthCross, Cardinals.S);
-                //(crossedBorderx.BorderLine.Z / (int)Constants.RegionSize)
-
-                if (crossedBordery.BorderLine.Z > 0)
-                {
-                    pos.Y = ((pos.Y + crossedBordery.BorderLine.Z));
-                    changeY = (int)(crossedBordery.BorderLine.Z / (int)Constants.RegionSize);
-                }
-                else
-                    pos.Y = ((pos.Y + Constants.RegionSize));
 
-                newRegionHandle
-                    = Util.UIntsToLong((uint)(thisx * Constants.RegionSize), (uint)((thisy - changeY) * Constants.RegionSize));
-                // y - 1
-            }
-            else if (scene.TestBorderCross(attemptedPosition + NorthCross, Cardinals.N))
+            if (destination == null || !CrossPrimGroupIntoNewRegion(destination, pos, grp, silent))
             {
+                m_log.InfoFormat("[ENTITY TRANSFER MODULE] cross region transfer failed for object {0}", grp.UUID);
 
-                pos.Y = ((pos.Y - Constants.RegionSize));
-                newRegionHandle
-                    = Util.UIntsToLong((uint)(thisx * Constants.RegionSize), (uint)((thisy + changeY) * Constants.RegionSize));
-                // y + 1
-            }
+                // We are going to move the object back to the old position so long as the old position
+                // is in the region
+                oldGroupPosition.X = Util.Clamp<float>(oldGroupPosition.X, 1.0f, (float)(scene.RegionInfo.RegionSizeX - 1));
+                oldGroupPosition.Y = Util.Clamp<float>(oldGroupPosition.Y, 1.0f, (float)(scene.RegionInfo.RegionSizeY - 1));
+                oldGroupPosition.Z = Util.Clamp<float>(oldGroupPosition.Z, 1.0f, Constants.RegionHeight);
 
-            // Offset the positions for the new region across the border
-            Vector3 oldGroupPosition = grp.RootPart.GroupPosition;
+                grp.AbsolutePosition = oldGroupPosition;
+                grp.Velocity = Vector3.Zero;
+                if (grp.RootPart.PhysActor != null)
+                    grp.RootPart.PhysActor.CrossingFailure();
 
-            // If we fail to cross the border, then reset the position of the scene object on that border.
-            uint x = 0, y = 0;
-            Utils.LongToUInts(newRegionHandle, out x, out y);
-            GridRegion destination = scene.GridService.GetRegionByPosition(scene.RegionInfo.ScopeID, (int)x, (int)y);
+                if (grp.RootPart.KeyframeMotion != null)
+                    grp.RootPart.KeyframeMotion.CrossingFailure();
 
-            if (destination != null)
-            {
-                if (CrossPrimGroupIntoNewRegion(destination, pos, grp, silent))
-                    return; // we did it
+                grp.ScheduleGroupForFullUpdate();
             }
-
-            // no one or failed lets go back and tell physics to go on
-            oldGroupPosition.X = Util.Clamp<float>(oldGroupPosition.X, 0.5f, (float)Constants.RegionSize - 0.5f);
-            oldGroupPosition.Y = Util.Clamp<float>(oldGroupPosition.Y, 0.5f, (float)Constants.RegionSize - 0.5f);
-//            oldGroupPosition.Z = Util.Clamp<float>(oldGroupPosition.Z, 0.5f, 4096.0f);
-
-            grp.AbsolutePosition = oldGroupPosition;
-            grp.Velocity = Vector3.Zero;
-
-            if (grp.RootPart.PhysActor != null)
-                grp.RootPart.PhysActor.CrossingFailure();
-
-            if (grp.RootPart.KeyframeMotion != null)
-                grp.RootPart.KeyframeMotion.CrossingFailure();
-
-            grp.ScheduleGroupForFullUpdate();
         }
 
-
-
         /// <summary>
         /// Move the given scene object into a new region
         /// </summary>
diff --git a/OpenSim/Region/CoreModules/Scripting/EMailModules/EmailModule.cs b/OpenSim/Region/CoreModules/Scripting/EMailModules/EmailModule.cs
index d943b20..4e7ad75 100644
--- a/OpenSim/Region/CoreModules/Scripting/EMailModules/EmailModule.cs
+++ b/OpenSim/Region/CoreModules/Scripting/EMailModules/EmailModule.cs
@@ -213,8 +213,8 @@ namespace OpenSim.Region.CoreModules.Scripting.EmailModules
                     if (part != null)
                     {
                         ObjectRegionName = s.RegionInfo.RegionName;
-                        uint localX = (s.RegionInfo.RegionLocX * (int)Constants.RegionSize);
-                        uint localY = (s.RegionInfo.RegionLocY * (int)Constants.RegionSize);
+                        uint localX = s.RegionInfo.WorldLocX;
+                        uint localY = s.RegionInfo.WorldLocY;
                         ObjectRegionName = ObjectRegionName + " (" + localX + ", " + localY + ")";
                         return part;
                     }
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
index 31ef79b..8ccad39 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
@@ -268,11 +268,11 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
                     caps.AppendFormat("*** Neighbours of {0} ({1}) ***\n", kvp.Value.RegionName, kvp.Key);
                     List<GridRegion> regions = kvp.Value.GetNeighbours();
                     foreach (GridRegion r in regions)
-                        caps.AppendFormat("    {0} @ {1}-{2}\n", r.RegionName, r.RegionLocX / Constants.RegionSize, r.RegionLocY / Constants.RegionSize);
+                        caps.AppendFormat("    {0} @ {1}-{2}\n", r.RegionName, Util.WorldToRegionLoc((uint)r.RegionLocX), Util.WorldToRegionLoc((uint)r.RegionLocY));
                 }
             }
 
             MainConsole.Instance.Output(caps.ToString());
         }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs
index 9172536..ae76288 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs
@@ -66,7 +66,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
                 return;
 
             m_log.DebugFormat("[REGION CACHE]: (on region {0}) Region {1} is up @ {2}-{3}",
-                m_scene.RegionInfo.RegionName, otherRegion.RegionName, otherRegion.RegionLocX / Constants.RegionSize, otherRegion.RegionLocY / Constants.RegionSize);
+                m_scene.RegionInfo.RegionName, otherRegion.RegionName, Util.WorldToRegionLoc((uint)otherRegion.RegionLocX), Util.WorldToRegionLoc((uint)otherRegion.RegionLocY));
 
             m_neighbours[otherRegion.RegionHandle] = otherRegion;
         }
@@ -82,11 +82,16 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
             return new List<GridRegion>(m_neighbours.Values);
         }
 
+        // Get a region given its base coordinates (in meters).
+        // NOTE: this is NOT 'get a region by some point in the region'. The coordinate MUST
+        //     be the base coordinate of the region.
+        // The snapping is technically unnecessary but is harmless because regions are always
+        //     multiples of the legacy region size (256).
         public GridRegion GetRegionByPosition(int x, int y)
         {
             uint xsnap = (uint)(x / Constants.RegionSize) * Constants.RegionSize;
             uint ysnap = (uint)(y / Constants.RegionSize) * Constants.RegionSize;
-            ulong handle = Utils.UIntsToLong(xsnap, ysnap);
+            ulong handle = Util.RegionWorldLocToHandle(xsnap, ysnap);
             
             if (m_neighbours.ContainsKey(handle))
                 return m_neighbours[handle];
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/Tests/GridConnectorsTests.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/Tests/GridConnectorsTests.cs
index 4338133..6a49ca7 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/Tests/GridConnectorsTests.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/Tests/GridConnectorsTests.cs
@@ -141,7 +141,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid.Tests
             Assert.IsNotNull(result, "Retrieved GetRegionByUUID is null");
             Assert.That(result.RegionID, Is.EqualTo(new UUID(1)), "Retrieved region's UUID does not match");
 
-            result = m_LocalConnector.GetRegionByPosition(UUID.Zero, 1000 * (int)Constants.RegionSize, 1000 * (int)Constants.RegionSize);
+            result = m_LocalConnector.GetRegionByPosition(UUID.Zero, (int)Util.RegionToWorldLoc(1000), (int)Util.RegionToWorldLoc(1000));
             Assert.IsNotNull(result, "Retrieved GetRegionByPosition is null");
             Assert.That(result.RegionLocX, Is.EqualTo(1000 * (int)Constants.RegionSize), "Retrieved region's position does not match");
 
@@ -197,4 +197,4 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid.Tests
             Assert.That(results.Count, Is.EqualTo(0), "Retrieved linked regions collection is not the number expected");
         }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/MapImage/MapImageServiceModule.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/MapImage/MapImageServiceModule.cs
index 96182cd..da74f30 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/MapImage/MapImageServiceModule.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/MapImage/MapImageServiceModule.cs
@@ -57,6 +57,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.MapImage
     {
         private static readonly ILog m_log =
             LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static string LogHeader = "[MAP IMAGE SERVICE MODULE]";
 
         private bool m_enabled = false;
         private IMapImageService m_MapService;
@@ -192,47 +193,94 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.MapImage
             m_lastrefresh = Util.EnvironmentTickCount();
         }
 
+        public void UploadMapTile(IScene scene, Bitmap mapTile)
+        {
+            m_log.DebugFormat("{0} Upload maptile for {1}", LogHeader, scene.Name);
+
+            // mapTile.Save(   // DEBUG DEBUG
+            //     String.Format("maptiles/raw-{0}-{1}-{2}.jpg", regionName, scene.RegionInfo.RegionLocX, scene.RegionInfo.RegionLocY),
+            //     ImageFormat.Jpeg);
+            // If the region/maptile is legacy sized, just upload the one tile like it has always been done
+            if (mapTile.Width == Constants.RegionSize && mapTile.Height == Constants.RegionSize)
+            {
+                ConvertAndUploadMaptile(mapTile, scene,
+                                        scene.RegionInfo.RegionLocX, scene.RegionInfo.RegionLocY);
+            }
+            else
+            {
+                // For larger regions (varregion) we must cut the region image into legacy sized
+                //    pieces since that is how the maptile system works.
+                // Note the assumption that varregions are always a multiple of legacy size.
+                for (uint xx = 0; xx < mapTile.Width; xx += Constants.RegionSize)
+                {
+                    for (uint yy = 0; yy < mapTile.Height; yy += Constants.RegionSize)
+                    {
+                        // Images are addressed from the upper left corner so have to do funny
+                        //     math to pick out the sub-tile since regions are numbered from
+                        //     the lower left.
+                        Rectangle rect = new Rectangle(
+                            (int)xx,
+                            mapTile.Height - (int)yy - (int)Constants.RegionSize,
+                            (int)Constants.RegionSize, (int)Constants.RegionSize);
+                        using (Bitmap subMapTile = mapTile.Clone(rect, mapTile.PixelFormat))
+                        {
+                            ConvertAndUploadMaptile(subMapTile, scene,
+                                                    scene.RegionInfo.RegionLocX + (xx / Constants.RegionSize),
+                                                    scene.RegionInfo.RegionLocY + (yy / Constants.RegionSize)
+                                                    );
+                        }
+                    }
+                }
+            }
+        }
+
         ///<summary>
         ///
         ///</summary>
         public void UploadMapTile(IScene scene)
         {
-            m_log.DebugFormat("[MAP IMAGE SERVICE MODULE]: upload maptile for {0}", scene.RegionInfo.RegionName);
+            m_log.DebugFormat("{0}: upload maptile for {1}", LogHeader, scene.RegionInfo.RegionName);
 
             // Create a JPG map tile and upload it to the AddMapTile API
-            byte[] jpgData = Utils.EmptyBytes;
             IMapImageGenerator tileGenerator = scene.RequestModuleInterface<IMapImageGenerator>();
             if (tileGenerator == null)
             {
-                m_log.Warn("[MAP IMAGE SERVICE MODULE]: Cannot upload PNG map tile without an ImageGenerator");
+                m_log.WarnFormat("{0} Cannot upload map tile without an ImageGenerator", LogHeader);
                 return;
             }
 
-            using (Image mapTile = tileGenerator.CreateMapTile())
+            using (Bitmap mapTile = tileGenerator.CreateMapTile())
             {
                 // XXX: The MapImageModule will return a null if the user has chosen not to create map tiles and there
                 // is no static map tile.
                 if (mapTile == null)
                     return;
 
-                using (MemoryStream stream = new MemoryStream())
-                {
-                    mapTile.Save(stream, ImageFormat.Jpeg);
-                    jpgData = stream.ToArray();
-                }
+                UploadMapTile(scene, mapTile);
             }
+        }
+
+        private void ConvertAndUploadMaptile(Image tileImage, IScene scene, uint locX, uint locY)
+        {
+            byte[] jpgData = Utils.EmptyBytes;
 
-            if (jpgData == Utils.EmptyBytes)
+            using (MemoryStream stream = new MemoryStream())
             {
-                m_log.WarnFormat("[MAP IMAGE SERVICE MODULE]: Tile image generation failed");
-                return;
+                tileImage.Save(stream, ImageFormat.Jpeg);
+                jpgData = stream.ToArray();
             }
-
-            string reason = string.Empty;
-            if (!m_MapService.AddMapTile((int)scene.RegionInfo.RegionLocX, (int)scene.RegionInfo.RegionLocY, jpgData, scene.RegionInfo.ScopeID, out reason))
+            if (jpgData != Utils.EmptyBytes)
+            {
+                string reason = string.Empty;
+                if (!m_MapService.AddMapTile((int)locX, (int)locY, jpgData, scene.RegionInfo.ScopeID, out reason))
+                {
+                    m_log.DebugFormat("{0} Unable to upload tile image for {1} at {2}-{3}: {4}", LogHeader,
+                        scene.RegionInfo.RegionName, locX, locY, reason);
+                }
+            }
+            else
             {
-                m_log.DebugFormat("[MAP IMAGE SERVICE MODULE]: Unable to upload tile image for {0} at {1}-{2}: {3}",
-                    scene.RegionInfo.RegionName, scene.RegionInfo.RegionLocX, scene.RegionInfo.RegionLocY, reason);
+                m_log.WarnFormat("{0} Tile image generation failed for region {1}", LogHeader, scene.RegionInfo.RegionName);
             }
         }
     }
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Neighbour/LocalNeighbourServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Neighbour/LocalNeighbourServiceConnector.cs
index fd89428..bda354f 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Neighbour/LocalNeighbourServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Neighbour/LocalNeighbourServiceConnector.cs
@@ -125,14 +125,14 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Neighbour
         public OpenSim.Services.Interfaces.GridRegion HelloNeighbour(ulong regionHandle, RegionInfo thisRegion)
         {
             uint x, y;
-            Utils.LongToUInts(regionHandle, out x, out y);
+            Util.RegionHandleToRegionLoc(regionHandle, out x, out y);
 
             foreach (Scene s in m_Scenes)
             {
                 if (s.RegionInfo.RegionHandle == regionHandle)
                 {
                     m_log.DebugFormat("[LOCAL NEIGHBOUR SERVICE CONNECTOR]: HelloNeighbour from region {0} to neighbour {1} at {2}-{3}",
-                        thisRegion.RegionName, s.Name, x / Constants.RegionSize, y / Constants.RegionSize);
+                                                thisRegion.RegionName, s.Name, x, y );
 
                     //m_log.Debug("[NEIGHBOUR CONNECTOR]: Found region to SendHelloNeighbour");
                     return s.IncomingHelloNeighbour(thisRegion);
diff --git a/OpenSim/Region/CoreModules/World/Archiver/ArchiveWriteRequest.cs b/OpenSim/Region/CoreModules/World/Archiver/ArchiveWriteRequest.cs
index 7a844f4..cd95ee9 100644
--- a/OpenSim/Region/CoreModules/World/Archiver/ArchiveWriteRequest.cs
+++ b/OpenSim/Region/CoreModules/World/Archiver/ArchiveWriteRequest.cs
@@ -533,7 +533,7 @@ namespace OpenSim.Region.CoreModules.World.Archiver
             if (isMegaregion)
                 size = rcMod.GetSizeOfMegaregion(scene.RegionInfo.RegionID);
             else
-                size = new Vector2((float)Constants.RegionSize, (float)Constants.RegionSize);
+                size = new Vector2((float)scene.RegionInfo.RegionSizeX, (float)scene.RegionInfo.RegionSizeY);
     
             xtw.WriteElementString("is_megaregion", isMegaregion.ToString());
             xtw.WriteElementString("size_in_meters", string.Format("{0},{1}", size.X, size.Y));
diff --git a/OpenSim/Region/CoreModules/World/Land/LandManagementModule.cs b/OpenSim/Region/CoreModules/World/Land/LandManagementModule.cs
index 9279066..4aee6a5 100644
--- a/OpenSim/Region/CoreModules/World/Land/LandManagementModule.cs
+++ b/OpenSim/Region/CoreModules/World/Land/LandManagementModule.cs
@@ -64,6 +64,12 @@ namespace OpenSim.Region.CoreModules.World.Land
     public class LandManagementModule : INonSharedRegionModule
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly string LogHeader = "[LAND MANAGEMENT MODULE]";
+
+        /// <summary>
+        /// Minimum land unit size in region co-ordinates.
+        /// </summary>
+        public const int landUnit = 4;
 
         private static readonly string remoteParcelRequestPath = "0009/";
 
@@ -74,15 +80,10 @@ namespace OpenSim.Region.CoreModules.World.Land
         protected IPrimCountModule m_primCountModule;
         protected IDialogModule m_Dialog;
 
-        // Minimum for parcels to work is 64m even if we don't actually use them.
-        #pragma warning disable 0429
-        private const int landArrayMax = ((int)((int)Constants.RegionSize / 4) >= 64) ? (int)((int)Constants.RegionSize / 4) : 64;
-        #pragma warning restore 0429
-
         /// <value>
         /// Local land ids at specified region co-ordinates (region size / 4)
         /// </value>
-        private readonly int[,] m_landIDList = new int[landArrayMax, landArrayMax];
+        private int[,] m_landIDList;
 
         /// <value>
         /// Land objects keyed by local id
@@ -123,7 +124,7 @@ namespace OpenSim.Region.CoreModules.World.Land
         public void AddRegion(Scene scene)
         {
             m_scene = scene;
-            m_landIDList.Initialize();
+            m_landIDList = new int[m_scene.RegionInfo.RegionSizeX / landUnit, m_scene.RegionInfo.RegionSizeY / landUnit];
             landChannel = new LandChannel(scene, this);
 
             parcelInfoCache = new Cache();
@@ -235,7 +236,7 @@ namespace OpenSim.Region.CoreModules.World.Land
         public void UpdateLandObject(int local_id, LandData data)
         {
             LandData newData = data.Copy();
-            newData.LocalID = local_id;       
+            newData.LocalID = local_id;
 
             ILandObject land;
             lock (m_landList)
@@ -264,7 +265,7 @@ namespace OpenSim.Region.CoreModules.World.Land
             {
                 m_landList.Clear();
                 m_lastLandLocalID = LandChannel.START_LAND_LOCAL_ID - 1;
-                m_landIDList.Initialize();
+                m_landIDList = new int[m_scene.RegionInfo.RegionSizeX / landUnit, m_scene.RegionInfo.RegionSizeY / landUnit];
             }
         }
         
@@ -274,11 +275,11 @@ namespace OpenSim.Region.CoreModules.World.Land
         /// <returns>The parcel created.</returns>
         protected ILandObject CreateDefaultParcel()
         {
-            m_log.DebugFormat(
-                    "[LAND MANAGEMENT MODULE]: Creating default parcel for region {0}", m_scene.RegionInfo.RegionName);
+            m_log.DebugFormat("{0} Creating default parcel for region {1}", LogHeader, m_scene.RegionInfo.RegionName);
 
             ILandObject fullSimParcel = new LandObject(UUID.Zero, false, m_scene);
-            fullSimParcel.SetLandBitmap(fullSimParcel.GetSquareLandBitmap(0, 0, (int)Constants.RegionSize, (int)Constants.RegionSize));
+            fullSimParcel.SetLandBitmap(fullSimParcel.GetSquareLandBitmap(0, 0,
+                                            (int)m_scene.RegionInfo.RegionSizeX, (int)m_scene.RegionInfo.RegionSizeY));
             fullSimParcel.LandData.OwnerID = m_scene.RegionInfo.EstateSettings.EstateOwner;
             fullSimParcel.LandData.ClaimDate = Util.UnixTimeSinceEpoch();
 
@@ -569,9 +570,9 @@ namespace OpenSim.Region.CoreModules.World.Land
                 new_land.LandData.LocalID = newLandLocalID;
 
                 bool[,] landBitmap = new_land.GetLandBitmap();
-                for (int x = 0; x < landArrayMax; x++)
+                for (int x = 0; x < landBitmap.GetLength(0); x++)
                 {
-                    for (int y = 0; y < landArrayMax; y++)
+                    for (int y = 0; y < landBitmap.GetLength(1); y++)
                     {
                         if (landBitmap[x, y])
                         {
@@ -601,9 +602,9 @@ namespace OpenSim.Region.CoreModules.World.Land
             ILandObject land;
             lock (m_landList)
             {
-                for (int x = 0; x < 64; x++)
+                for (int x = 0; x < m_landIDList.GetLength(0); x++)
                 {
-                    for (int y = 0; y < 64; y++)
+                    for (int y = 0; y < m_landIDList.GetLength(1); y++)
                     {
                         if (m_landIDList[x, y] == local_id)
                         {
@@ -656,9 +657,9 @@ namespace OpenSim.Region.CoreModules.World.Land
             bool[,] landBitmapSlave = slave.GetLandBitmap();
             lock (m_landList)
             {
-                for (int x = 0; x < 64; x++)
+                for (int x = 0; x < landBitmapSlave.GetLength(0); x++)
                 {
-                    for (int y = 0; y < 64; y++)
+                    for (int y = 0; y < landBitmapSlave.GetLength(1); y++)
                     {
                         if (landBitmapSlave[x, y])
                         {
@@ -695,20 +696,23 @@ namespace OpenSim.Region.CoreModules.World.Land
             int x;
             int y;
 
-            if (x_float > Constants.RegionSize || x_float < 0 || y_float > Constants.RegionSize || y_float < 0)
+            if (x_float >= m_scene.RegionInfo.RegionSizeX || x_float < 0 || y_float >= m_scene.RegionInfo.RegionSizeX || y_float < 0)
                 return null;
 
             try
             {
-                x = Convert.ToInt32(Math.Floor(Convert.ToDouble(x_float) / 4.0));
-                y = Convert.ToInt32(Math.Floor(Convert.ToDouble(y_float) / 4.0));
+                x = Convert.ToInt32(Math.Floor(Convert.ToDouble(x_float) / (float)landUnit));
+                y = Convert.ToInt32(Math.Floor(Convert.ToDouble(y_float) / (float)landUnit));
             }
             catch (OverflowException)
             {
                 return null;
             }
 
-            if (x >= 64 || y >= 64 || x < 0 || y < 0)
+            if (x >= (m_scene.RegionInfo.RegionSizeX / landUnit)
+                    || y >= (m_scene.RegionInfo.RegionSizeY / landUnit)
+                    || x < 0
+                    || y < 0)
             {
                 return null;
             }
@@ -740,20 +744,20 @@ namespace OpenSim.Region.CoreModules.World.Land
             int avx = (int)x;
             if (avx < 0)
                 avx = 0;
-            else if (avx >= (int)Constants.RegionSize)
+            else if (avx >= m_scene.RegionInfo.RegionSizeX)
                 avx = (int)Constants.RegionSize - 1;
 
             int avy = (int)y;
             if (avy < 0)
                 avy = 0;
-            else if (avy >= (int)Constants.RegionSize)
+            else if (avy >= m_scene.RegionInfo.RegionSizeY)
                 avy = (int)Constants.RegionSize - 1;
 
             lock (m_landIDList)
             {
                 try
                 {
-                    return m_landList[m_landIDList[avx / 4, avy / 4]];
+                    return m_landList[m_landIDList[avx / landUnit, avy / landUnit]];
                 }
                 catch (IndexOutOfRangeException)
                 {
@@ -764,7 +768,7 @@ namespace OpenSim.Region.CoreModules.World.Land
 
         public ILandObject GetLandObject(int x, int y)
         {
-            if (x >= Convert.ToInt32(Constants.RegionSize) || y >= Convert.ToInt32(Constants.RegionSize) || x < 0 || y < 0)
+            if (x >= m_scene.RegionInfo.RegionSizeX || y >= m_scene.RegionInfo.RegionSizeY || x < 0 || y < 0)
             {
                 // These exceptions here will cause a lot of complaints from the users specifically because
                 // they happen every time at border crossings
@@ -1057,9 +1061,10 @@ namespace OpenSim.Region.CoreModules.World.Land
             int byteArrayCount = 0;
             int sequenceID = 0;
 
-            for (int y = 0; y < Constants.RegionSize; y += 4)
+            // Layer data is in landUnit (4m) chunks
+            for (int y = 0; y < m_scene.RegionInfo.RegionSizeY; y += landUnit)
             {
-                for (int x = 0; x < Constants.RegionSize; x += 4)
+                for (int x = 0; x < m_scene.RegionInfo.RegionSizeX; x += landUnit)
                 {
                     byte tempByte = 0; //This represents the byte for the current 4x4
 
@@ -1769,7 +1774,7 @@ namespace OpenSim.Region.CoreModules.World.Land
                 {
                     // most likely still cached from building the extLandData entry
                     uint x = 0, y = 0;
-                    Utils.LongToUInts(data.RegionHandle, out x, out y);
+                    Util.RegionHandleToWorldLoc(data.RegionHandle, out x, out y);
                     info = m_scene.GridService.GetRegionByPosition(m_scene.RegionInfo.ScopeID, (int)x, (int)y);
                 }
                 // we need to transfer the fake parcelID, not the one in landData, so the viewer can match it to the landmark.
diff --git a/OpenSim/Region/CoreModules/World/Land/LandObject.cs b/OpenSim/Region/CoreModules/World/Land/LandObject.cs
index a3cd4a5..5858d6c 100644
--- a/OpenSim/Region/CoreModules/World/Land/LandObject.cs
+++ b/OpenSim/Region/CoreModules/World/Land/LandObject.cs
@@ -45,15 +45,13 @@ namespace OpenSim.Region.CoreModules.World.Land
         #region Member Variables
 
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
-        #pragma warning disable 0429
-        private const int landArrayMax = ((int)((int)Constants.RegionSize / 4) >= 64) ? (int)((int)Constants.RegionSize / 4) : 64;
-        #pragma warning restore 0429
-        private bool[,] m_landBitmap = new bool[landArrayMax,landArrayMax];
+        private static readonly string LogHeader = "[LAND OBJECT]";
+
+        private readonly int landUnit = 4;
 
         private int m_lastSeqId = 0;
         private int m_expiryCounter = 0;
 
-        protected LandData m_landData = new LandData();        
         protected Scene m_scene;
         protected List<SceneObjectGroup> primsOverMe = new List<SceneObjectGroup>();
         protected Dictionary<uint, UUID> m_listTransactions = new Dictionary<uint, UUID>();
@@ -61,6 +59,7 @@ namespace OpenSim.Region.CoreModules.World.Land
         protected ExpiringCache<UUID, bool> m_groupMemberCache = new ExpiringCache<UUID, bool>();
         protected TimeSpan m_groupMemberCacheTimeout = TimeSpan.FromSeconds(30);  // cache invalidation after 30 seconds
 
+        private bool[,] m_landBitmap;
         public bool[,] LandBitmap
         {
             get { return m_landBitmap; }
@@ -76,6 +75,7 @@ namespace OpenSim.Region.CoreModules.World.Land
             return free;
         }
 
+        protected LandData m_landData;        
         public LandData LandData
         {
             get { return m_landData; }
@@ -94,12 +94,12 @@ namespace OpenSim.Region.CoreModules.World.Land
         {
             get
             {
-                for (int y = 0; y < landArrayMax; y++)
+                for (int y = 0; y < LandBitmap.GetLength(1); y++)
                 {
-                    for (int x = 0; x < landArrayMax; x++)
+                    for (int x = 0; x < LandBitmap.GetLength(0); x++)
                     {
                         if (LandBitmap[x, y])
-                            return new Vector3(x * 4, y * 4, 0);
+                            return new Vector3(x * landUnit, y * landUnit, 0);
                     }
                 }
 
@@ -111,13 +111,13 @@ namespace OpenSim.Region.CoreModules.World.Land
         {
             get
             {
-                for (int y = landArrayMax - 1; y >= 0; y--)
+                for (int y = LandBitmap.GetLength(1) - 1; y >= 0; y--)
                 {
-                    for (int x = landArrayMax - 1; x >= 0; x--)
+                    for (int x = LandBitmap.GetLength(0) - 1; x >= 0; x--)
                     {
                         if (LandBitmap[x, y])
                         {
-                            return new Vector3(x * 4 + 4, y * 4 + 4, 0);
+                            return new Vector3(x * landUnit + landUnit, y * landUnit + landUnit, 0);
                         }
                     }
                 }
@@ -128,9 +128,21 @@ namespace OpenSim.Region.CoreModules.World.Land
 
         #region Constructors
 
+        public LandObject(LandData landData, Scene scene)
+        {
+            LandData = landData.Copy();
+            m_scene = scene;
+        }
+
         public LandObject(UUID owner_id, bool is_group_owned, Scene scene)
         {
             m_scene = scene;
+            if (m_scene == null)
+                LandBitmap = new bool[Constants.RegionSize / landUnit, Constants.RegionSize / landUnit];
+            else
+                LandBitmap = new bool[m_scene.RegionInfo.RegionSizeX / landUnit, m_scene.RegionInfo.RegionSizeY / landUnit];
+
+            LandData = new LandData(); 
             LandData.OwnerID = owner_id;
             if (is_group_owned)
                 LandData.GroupID = owner_id;
@@ -155,9 +167,9 @@ namespace OpenSim.Region.CoreModules.World.Land
         /// <returns>Returns true if the piece of land contains the specified point</returns>
         public bool ContainsPoint(int x, int y)
         {
-            if (x >= 0 && y >= 0 && x < Constants.RegionSize && y < Constants.RegionSize)
+            if (x >= 0 && y >= 0 && x < m_scene.RegionInfo.RegionSizeX && y < m_scene.RegionInfo.RegionSizeY)
             {
-                return (LandBitmap[x / 4, y / 4] == true);
+                return LandBitmap[x / landUnit, y / landUnit];
             }
             else
             {
@@ -197,10 +209,10 @@ namespace OpenSim.Region.CoreModules.World.Land
             else
             {
                 // Normal Calculations
-                int parcelMax = (int)((long)LandData.Area
+                int parcelMax = (int)( (long)LandData.Area
                               * (long)m_scene.RegionInfo.ObjectCapacity
                               * (long)m_scene.RegionInfo.RegionSettings.ObjectBonus
-                              / 65536L);
+                              / (long)(m_scene.RegionInfo.RegionSizeX * m_scene.RegionInfo.RegionSizeY) );
                 //m_log.DebugFormat("Area: {0}, Capacity {1}, Bonus {2}, Parcel {3}", LandData.Area, m_scene.RegionInfo.ObjectCapacity, m_scene.RegionInfo.RegionSettings.ObjectBonus, parcelMax);
                 return parcelMax;
             }
@@ -231,8 +243,9 @@ namespace OpenSim.Region.CoreModules.World.Land
             else
             {
                 //Normal Calculations
-                int simMax = (int)((long)LandData.SimwideArea
-                           * (long)m_scene.RegionInfo.ObjectCapacity / 65536L);
+                int simMax = (int)(   (long)LandData.SimwideArea
+                                    * (long)m_scene.RegionInfo.ObjectCapacity
+                                    / (long)(m_scene.RegionInfo.RegionSizeX * m_scene.RegionInfo.RegionSizeY) );
                 // m_log.DebugFormat("Simwide Area: {0}, Capacity {1}, SimMax {2}", LandData.SimwideArea, m_scene.RegionInfo.ObjectCapacity, simMax);
                 return simMax;
             }
@@ -597,8 +610,8 @@ namespace OpenSim.Region.CoreModules.World.Land
                 try
                 {
                     over =
-                        m_scene.LandChannel.GetLandObject(Util.Clamp<int>((int)Math.Round(avatar.AbsolutePosition.X), 0, ((int)Constants.RegionSize - 1)),
-                                                          Util.Clamp<int>((int)Math.Round(avatar.AbsolutePosition.Y), 0, ((int)Constants.RegionSize - 1)));
+                        m_scene.LandChannel.GetLandObject(Util.Clamp<int>((int)Math.Round(avatar.AbsolutePosition.X), 0, ((int)m_scene.RegionInfo.RegionSizeX - 1)),
+                                                          Util.Clamp<int>((int)Math.Round(avatar.AbsolutePosition.Y), 0, ((int)m_scene.RegionInfo.RegionSizeY - 1)));
                 }
                 catch (Exception)
                 {
@@ -752,9 +765,9 @@ namespace OpenSim.Region.CoreModules.World.Land
             int max_y = Int32.MinValue;
             int tempArea = 0;
             int x, y;
-            for (x = 0; x < 64; x++)
+            for (x = 0; x < LandBitmap.GetLength(0); x++)
             {
-                for (y = 0; y < 64; y++)
+                for (y = 0; y < LandBitmap.GetLength(1); y++)
                 {
                     if (LandBitmap[x, y] == true)
                     {
@@ -766,23 +779,25 @@ namespace OpenSim.Region.CoreModules.World.Land
                             max_x = x;
                         if (max_y < y)
                             max_y = y;
-                        tempArea += 16; //16sqm peice of land
+                        tempArea += landUnit * landUnit; //16sqm peice of land
                     }
                 }
             }
+            int tx = min_x * landUnit;
+            if (tx > ((int)m_scene.RegionInfo.RegionSizeX - 1))
+                tx = ((int)m_scene.RegionInfo.RegionSizeX - 1);
 
-            int tx = min_x * 4;
             int htx;
-            if (tx == ((int)Constants.RegionSize))
-                htx = tx - 1;
+            if (tx >= ((int)m_scene.RegionInfo.RegionSizeX))
+                htx = (int)m_scene.RegionInfo.RegionSizeX - 1;
             else
                 htx = tx;
             
-            int ty = min_y * 4;
+            int ty = min_y * landUnit;
             int hty;
 
-            if (ty == ((int)Constants.RegionSize))
-                hty = ty - 1;
+            if (ty >= ((int)m_scene.RegionInfo.RegionSizeY))
+                hty = (int)m_scene.RegionInfo.RegionSizeY - 1;
             else
                 hty = ty;
 
@@ -791,17 +806,17 @@ namespace OpenSim.Region.CoreModules.World.Land
                     (float)(tx), (float)(ty), m_scene != null ? (float)m_scene.Heightmap[htx, hty] : 0);
 
             max_x++;
-            tx = max_x * 4;
-            if (tx == ((int)Constants.RegionSize))
-                htx = tx - 1;
+            tx = max_x * landUnit;
+            if (tx >= ((int)m_scene.RegionInfo.RegionSizeX))
+                htx = (int)m_scene.RegionInfo.RegionSizeX - 1;
             else
                 htx = tx;
 
             max_y++;
             ty = max_y * 4;
            
-            if (ty == ((int)Constants.RegionSize))
-                hty = ty - 1;
+            if (ty >= ((int)m_scene.RegionInfo.RegionSizeY))
+                hty = (int)m_scene.RegionInfo.RegionSizeY - 1;
             else
                 hty = ty;
 
@@ -819,20 +834,11 @@ namespace OpenSim.Region.CoreModules.World.Land
         /// <summary>
         /// Sets the land's bitmap manually
         /// </summary>
-        /// <param name="bitmap">64x64 block representing where this land is on a map</param>
+        /// <param name="bitmap">block representing where this land is on a map mapped in a 4x4 meter grid</param>
         public void SetLandBitmap(bool[,] bitmap)
         {
-            if (bitmap.GetLength(0) != 64 || bitmap.GetLength(1) != 64 || bitmap.Rank != 2)
-            {
-                //Throw an exception - The bitmap is not 64x64
-                //throw new Exception("Error: Invalid Parcel Bitmap");
-            }
-            else
-            {
-                //Valid: Lets set it
-                LandBitmap = bitmap;
-                ForceUpdateLandInfo();
-            }
+            LandBitmap = bitmap;
+            ForceUpdateLandInfo();
         }
 
         /// <summary>
@@ -846,14 +852,16 @@ namespace OpenSim.Region.CoreModules.World.Land
 
         public bool[,] BasicFullRegionLandBitmap()
         {
-            return GetSquareLandBitmap(0, 0, (int) Constants.RegionSize, (int) Constants.RegionSize);
+            return GetSquareLandBitmap(0, 0, (int)m_scene.RegionInfo.RegionSizeX, (int) m_scene.RegionInfo.RegionSizeY);
         }
         
         public bool[,] GetSquareLandBitmap(int start_x, int start_y, int end_x, int end_y)
         {
-            bool[,] tempBitmap = new bool[64,64];
+            // Empty bitmap for the whole region
+            bool[,] tempBitmap = new bool[m_scene.RegionInfo.RegionSizeX / landUnit, m_scene.RegionInfo.RegionSizeY / landUnit];
             tempBitmap.Initialize();
 
+            // Fill the bitmap square area specified by state and end
             tempBitmap = ModifyLandBitmapSquare(tempBitmap, start_x, start_y, end_x, end_y, true);
             return tempBitmap;
         }
@@ -871,19 +879,13 @@ namespace OpenSim.Region.CoreModules.World.Land
         public bool[,] ModifyLandBitmapSquare(bool[,] land_bitmap, int start_x, int start_y, int end_x, int end_y,
                                               bool set_value)
         {
-            if (land_bitmap.GetLength(0) != 64 || land_bitmap.GetLength(1) != 64 || land_bitmap.Rank != 2)
-            {
-                //Throw an exception - The bitmap is not 64x64
-                //throw new Exception("Error: Invalid Parcel Bitmap in modifyLandBitmapSquare()");
-            }
-
             int x, y;
-            for (y = 0; y < 64; y++)
+            for (y = 0; y < land_bitmap.GetLength(1); y++)
             {
-                for (x = 0; x < 64; x++)
+                for (x = 0; x < land_bitmap.GetLength(0); x++)
                 {
-                    if (x >= start_x / 4 && x < end_x / 4
-                        && y >= start_y / 4 && y < end_y / 4)
+                    if (x >= start_x / landUnit && x < end_x / landUnit
+                        && y >= start_y / landUnit && y < end_y / landUnit)
                     {
                         land_bitmap[x, y] = set_value;
                     }
@@ -900,21 +902,21 @@ namespace OpenSim.Region.CoreModules.World.Land
         /// <returns></returns>
         public bool[,] MergeLandBitmaps(bool[,] bitmap_base, bool[,] bitmap_add)
         {
-            if (bitmap_base.GetLength(0) != 64 || bitmap_base.GetLength(1) != 64 || bitmap_base.Rank != 2)
-            {
-                //Throw an exception - The bitmap is not 64x64
-                throw new Exception("Error: Invalid Parcel Bitmap - Bitmap_base in mergeLandBitmaps");
-            }
-            if (bitmap_add.GetLength(0) != 64 || bitmap_add.GetLength(1) != 64 || bitmap_add.Rank != 2)
+            if (bitmap_base.GetLength(0) != bitmap_add.GetLength(0)
+                    || bitmap_base.GetLength(1) != bitmap_add.GetLength(1)
+                    || bitmap_add.Rank != 2
+                    || bitmap_base.Rank != 2)
             {
-                //Throw an exception - The bitmap is not 64x64
-                throw new Exception("Error: Invalid Parcel Bitmap - Bitmap_add in mergeLandBitmaps");
+                throw new Exception(
+                    String.Format("{0} MergeLandBitmaps. merging maps not same size. baseSizeXY=<{1},{2}>, addSizeXY=<{3},{4}>",
+                                LogHeader, bitmap_base.GetLength(0), bitmap_base.GetLength(1), bitmap_add.GetLength(0), bitmap_add.GetLength(1))
+                );
             }
 
             int x, y;
-            for (y = 0; y < 64; y++)
+            for (y = 0; y < bitmap_base.GetLength(1); y++)
             {
-                for (x = 0; x < 64; x++)
+                for (x = 0; x < bitmap_add.GetLength(0); x++)
                 {
                     if (bitmap_add[x, y])
                     {
@@ -931,14 +933,14 @@ namespace OpenSim.Region.CoreModules.World.Land
         /// <returns></returns>
         private byte[] ConvertLandBitmapToBytes()
         {
-            byte[] tempConvertArr = new byte[512];
+            byte[] tempConvertArr = new byte[LandBitmap.GetLength(0) * LandBitmap.GetLength(1) / 8];
             int tempByte = 0;
-            int x, y, i, byteNum = 0;
+            int i, byteNum = 0;
             int mask = 1;
             i = 0;
-            for (y = 0; y < 64; y++)
+            for (int y = 0; y < LandBitmap.GetLength(1); y++)
             {
-                for (x = 0; x < 64; x++)
+                for (int x = 0; x < LandBitmap.GetLength(0); x++)
                 {
                     if (LandBitmap[x, y])
                         tempByte |= mask;
@@ -971,25 +973,45 @@ namespace OpenSim.Region.CoreModules.World.Land
 
         private bool[,] ConvertBytesToLandBitmap()
         {
-            bool[,] tempConvertMap = new bool[landArrayMax, landArrayMax];
+            bool[,] tempConvertMap = new bool[m_scene.RegionInfo.RegionSizeX / landUnit, m_scene.RegionInfo.RegionSizeY / landUnit];
             tempConvertMap.Initialize();
             byte tempByte = 0;
-            int x = 0, y = 0, i = 0, bitNum = 0;
-            for (i = 0; i < 512; i++)
+            // Math.Min overcomes an old bug that might have made it into the database. Only use the bytes that fit into convertMap.
+            int bitmapLen = Math.Min(LandData.Bitmap.Length, tempConvertMap.GetLength(0) * tempConvertMap.GetLength(1) / 8);
+            int xLen = (int)(m_scene.RegionInfo.RegionSizeX / landUnit);
+
+            if (bitmapLen == 512)
+            {
+                // Legacy bitmap being passed in. Use the legacy region size
+                //    and only set the lower area of the larger region.
+                xLen = (int)(Constants.RegionSize / landUnit);
+            }
+            // m_log.DebugFormat("{0} ConvertBytesToLandBitmap: bitmapLen={1}, xLen={2}", LogHeader, bitmapLen, xLen);
+
+            int x = 0, y = 0;
+            for (int i = 0; i < bitmapLen; i++)
             {
                 tempByte = LandData.Bitmap[i];
-                for (bitNum = 0; bitNum < 8; bitNum++)
+                for (int bitNum = 0; bitNum < 8; bitNum++)
                 {
                     bool bit = Convert.ToBoolean(Convert.ToByte(tempByte >> bitNum) & (byte) 1);
-                    tempConvertMap[x, y] = bit;
+                    try
+                    {
+                        tempConvertMap[x, y] = bit;
+                    }
+                    catch (Exception)
+                    {
+                        m_log.DebugFormat("{0} ConvertBytestoLandBitmap: i={1}, x={2}, y={3}", LogHeader, i, x, y);
+                    }
                     x++;
-                    if (x > 63)
+                    if (x >= xLen)
                     {
                         x = 0;
                         y++;
                     }
                 }
             }
+
             return tempConvertMap;
         }
 
diff --git a/OpenSim/Region/CoreModules/World/LegacyMap/MapImageModule.cs b/OpenSim/Region/CoreModules/World/LegacyMap/MapImageModule.cs
index bc52a43..c7ffeaf 100644
--- a/OpenSim/Region/CoreModules/World/LegacyMap/MapImageModule.cs
+++ b/OpenSim/Region/CoreModules/World/LegacyMap/MapImageModule.cs
@@ -102,7 +102,8 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
 
                 terrainRenderer.Initialise(m_scene, m_config);
 
-                mapbmp = new Bitmap((int)Constants.RegionSize, (int)Constants.RegionSize, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
+                mapbmp = new Bitmap((int)m_scene.Heightmap.Width, (int)m_scene.Heightmap.Height,
+                                        System.Drawing.Imaging.PixelFormat.Format24bppRgb);
                 //long t = System.Environment.TickCount;
                 //for (int i = 0; i < 10; ++i) {
                 terrainRenderer.TerrainToBitmap(mapbmp);
@@ -277,7 +278,7 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
         private Bitmap DrawObjectVolume(Scene whichScene, Bitmap mapbmp)
         {
             int tc = 0;
-            double[,] hm = whichScene.Heightmap.GetDoubles();
+            ITerrainChannel hm = whichScene.Heightmap;
             tc = Environment.TickCount;
             m_log.Debug("[MAPTILE]: Generating Maptile Step 2: Object Volume Profile");
             EntityBase[] objs = whichScene.GetEntities();
@@ -363,7 +364,7 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
                                     Vector3 pos = part.GetWorldPosition();
 
                                     // skip prim outside of retion
-                                    if (pos.X < 0f || pos.X > 256f || pos.Y < 0f || pos.Y > 256f)
+                                    if (!m_scene.PositionIsInCurrentRegion(pos))
                                         continue;
 
                                     // skip prim in non-finite position
@@ -388,7 +389,7 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
                                         Vector3 lscale = new Vector3(part.Shape.Scale.X, part.Shape.Scale.Y, part.Shape.Scale.Z);
                                         Vector3 scale = new Vector3();
                                         Vector3 tScale = new Vector3();
-                                        Vector3 axPos = new Vector3(pos.X,pos.Y,pos.Z);
+                                        Vector3 axPos = new Vector3(pos.X, pos.Y, pos.Z);
 
                                         Quaternion llrot = part.GetWorldRotation();
                                         Quaternion rot = new Quaternion(llrot.W, llrot.X, llrot.Y, llrot.Z);
@@ -406,9 +407,14 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
                                         int mapdrawendY = (int)(pos.Y + scale.Y);
 
                                         // If object is beyond the edge of the map, don't draw it to avoid errors
-                                        if (mapdrawstartX < 0 || mapdrawstartX > ((int)Constants.RegionSize - 1) || mapdrawendX < 0 || mapdrawendX > ((int)Constants.RegionSize - 1)
-                                                              || mapdrawstartY < 0 || mapdrawstartY > ((int)Constants.RegionSize - 1) || mapdrawendY < 0
-                                                              || mapdrawendY > ((int)Constants.RegionSize - 1))
+                                        if (mapdrawstartX < 0
+                                                    || mapdrawstartX > (hm.Width - 1)
+                                                    || mapdrawendX < 0
+                                                    || mapdrawendX > (hm.Width - 1)
+                                                    || mapdrawstartY < 0
+                                                    || mapdrawstartY > (hm.Height - 1)
+                                                    || mapdrawendY < 0
+                                                    || mapdrawendY > (hm.Height - 1))
                                             continue;
 
     #region obb face reconstruction part duex
@@ -530,11 +536,11 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
                                         for (int i = 0; i < FaceA.Length; i++)
                                         {
                                             Point[] working = new Point[5];
-                                            working[0] = project(FaceA[i], axPos);
-                                            working[1] = project(FaceB[i], axPos);
-                                            working[2] = project(FaceD[i], axPos);
-                                            working[3] = project(FaceC[i], axPos);
-                                            working[4] = project(FaceA[i], axPos);
+                                            working[0] = project(hm, FaceA[i], axPos);
+                                            working[1] = project(hm, FaceB[i], axPos);
+                                            working[2] = project(hm, FaceD[i], axPos);
+                                            working[3] = project(hm, FaceC[i], axPos);
+                                            working[4] = project(hm, FaceA[i], axPos);
 
                                             face workingface = new face();
                                             workingface.pts = working;
@@ -609,17 +615,17 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
             return mapbmp;
         }
 
-        private Point project(Vector3 point3d, Vector3 originpos)
+        private Point project(ITerrainChannel hm, Vector3 point3d, Vector3 originpos)
         {
             Point returnpt = new Point();
             //originpos = point3d;
             //int d = (int)(256f / 1.5f);
 
             //Vector3 topos = new Vector3(0, 0, 0);
-           // float z = -point3d.z - topos.z;
+            // float z = -point3d.z - topos.z;
 
             returnpt.X = (int)point3d.X;//(int)((topos.x - point3d.x) / z * d);
-            returnpt.Y = (int)(((int)Constants.RegionSize - 1) - point3d.Y);//(int)(255 - (((topos.y - point3d.y) / z * d)));
+            returnpt.Y = (int)((hm.Width - 1) - point3d.Y);//(int)(255 - (((topos.y - point3d.y) / z * d)));
 
             return returnpt;
         }
diff --git a/OpenSim/Region/CoreModules/World/LegacyMap/ShadedMapTileRenderer.cs b/OpenSim/Region/CoreModules/World/LegacyMap/ShadedMapTileRenderer.cs
index cb06fd4..708286c 100644
--- a/OpenSim/Region/CoreModules/World/LegacyMap/ShadedMapTileRenderer.cs
+++ b/OpenSim/Region/CoreModules/World/LegacyMap/ShadedMapTileRenderer.cs
@@ -31,6 +31,7 @@ using System.Reflection;
 using log4net;
 using Nini.Config;
 using OpenSim.Framework;
+using OpenSim.Region.Framework.Interfaces;
 using OpenSim.Region.Framework.Scenes;
 
 namespace OpenSim.Region.CoreModules.World.LegacyMap
@@ -39,8 +40,8 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
     {
         private static readonly Color WATER_COLOR = Color.FromArgb(29, 71, 95);
 
-        private static readonly ILog m_log =
-            LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly string LogHeader = "[SHADED MAPTILE RENDERER]";
 
         private Scene m_scene;
         //private IConfigSource m_config; // not used currently
@@ -53,19 +54,26 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
 
         public void TerrainToBitmap(Bitmap mapbmp)
         {
+            m_log.DebugFormat("{0} Generating Maptile Step 1: Terrain", LogHeader);
             int tc = Environment.TickCount;
-            m_log.Debug("[SHADED MAP TILE RENDERER]: Generating Maptile Step 1: Terrain");
 
-            double[,] hm = m_scene.Heightmap.GetDoubles();
+            ITerrainChannel hm = m_scene.Heightmap;
+
+            if (mapbmp.Width != hm.Width || mapbmp.Height != hm.Height)
+            {
+                m_log.ErrorFormat("{0} TerrainToBitmap. Passed bitmap wrong dimensions. passed=<{1},{2}>, size=<{3},{4}>",
+                    LogHeader, mapbmp.Width, mapbmp.Height, hm.Width, hm.Height);
+            }
+
             bool ShadowDebugContinue = true;
 
             bool terraincorruptedwarningsaid = false;
 
             float low = 255;
             float high = 0;
-            for (int x = 0; x < (int)Constants.RegionSize; x++)
+            for (int x = 0; x < hm.Width; x++)
             {
-                for (int y = 0; y < (int)Constants.RegionSize; y++)
+                for (int y = 0; y < hm.Height; y++)
                 {
                     float hmval = (float)hm[x, y];
                     if (hmval < low)
@@ -77,12 +85,12 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
 
             float waterHeight = (float)m_scene.RegionInfo.RegionSettings.WaterHeight;
 
-            for (int x = 0; x < (int)Constants.RegionSize; x++)
+            for (int x = 0; x < hm.Width; x++)
             {
-                for (int y = 0; y < (int)Constants.RegionSize; y++)
+                for (int y = 0; y < hm.Height; y++)
                 {
                     // Y flip the cordinates for the bitmap: hf origin is lower left, bm origin is upper left
-                    int yr = ((int)Constants.RegionSize - 1) - y;
+                    int yr = ((int)hm.Height - 1) - y;
 
                     float heightvalue = (float)hm[x, y];
 
@@ -109,12 +117,12 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
                             // .
                             //
                             // Shade the terrain for shadows
-                            if (x < ((int)Constants.RegionSize - 1) && yr < ((int)Constants.RegionSize - 1))
+                            if (x < (hm.Width - 1) && yr < (hm.Height - 1))
                             {
                                 float hfvalue = (float)hm[x, y];
                                 float hfvaluecompare = 0f;
 
-                                if ((x + 1 < (int)Constants.RegionSize) && (y + 1 < (int)Constants.RegionSize))
+                                if ((x + 1 < hm.Width) && (y + 1 < hm.Height))
                                 {
                                     hfvaluecompare = (float)hm[x + 1, y + 1]; // light from north-east => look at land height there
                                 }
@@ -179,7 +187,7 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
 
                                     if (ShadowDebugContinue)
                                     {
-                                        if ((x - 1 > 0) && (yr + 1 < (int)Constants.RegionSize))
+                                        if ((x - 1 > 0) && (yr + 1 < hm.Height))
                                         {
                                             color = mapbmp.GetPixel(x - 1, yr + 1);
                                             int r = color.R;
@@ -233,7 +241,7 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
                                 terraincorruptedwarningsaid = true;
                             }
                             Color black = Color.Black;
-                            mapbmp.SetPixel(x, ((int)Constants.RegionSize - y) - 1, black);
+                            mapbmp.SetPixel(x, (hm.Width - y) - 1, black);
                         }
                     }
                 }
@@ -242,4 +250,4 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
             m_log.Debug("[SHADED MAP TILE RENDERER]: Generating Maptile Step 1: Done in " + (Environment.TickCount - tc) + " ms");
         }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/CoreModules/World/Objects/BuySell/BuySellModule.cs b/OpenSim/Region/CoreModules/World/Objects/BuySell/BuySellModule.cs
index d4e4c25..014c845 100644
--- a/OpenSim/Region/CoreModules/World/Objects/BuySell/BuySellModule.cs
+++ b/OpenSim/Region/CoreModules/World/Objects/BuySell/BuySellModule.cs
@@ -151,14 +151,9 @@ namespace OpenSim.Region.CoreModules.World.Objects.BuySell
                 break;
 
             case 2: // Sell a copy
-                Vector3 inventoryStoredPosition = new Vector3
-                       (((group.AbsolutePosition.X > (int)Constants.RegionSize)
-                             ? 250
-                             : group.AbsolutePosition.X)
-                        ,
-                        (group.AbsolutePosition.X > (int)Constants.RegionSize)
-                            ? 250
-                            : group.AbsolutePosition.X,
+                Vector3 inventoryStoredPosition = new Vector3(
+                        Math.Min(group.AbsolutePosition.X, m_scene.RegionInfo.RegionSizeX - 6),
+                        Math.Min(group.AbsolutePosition.Y, m_scene.RegionInfo.RegionSizeY - 6),
                         group.AbsolutePosition.Z);
 
                 Vector3 originalPosition = group.AbsolutePosition;
diff --git a/OpenSim/Region/CoreModules/World/Permissions/PermissionsModule.cs b/OpenSim/Region/CoreModules/World/Permissions/PermissionsModule.cs
index 616fe98..928755d 100644
--- a/OpenSim/Region/CoreModules/World/Permissions/PermissionsModule.cs
+++ b/OpenSim/Region/CoreModules/World/Permissions/PermissionsModule.cs
@@ -1571,10 +1571,10 @@ namespace OpenSim.Region.CoreModules.World.Permissions
             float X = position.X;
             float Y = position.Y;
 
-            if (X > ((int)Constants.RegionSize - 1))
-                X = ((int)Constants.RegionSize - 1);
-            if (Y > ((int)Constants.RegionSize - 1))
-                Y = ((int)Constants.RegionSize - 1);
+            if (X > ((int)m_scene.RegionInfo.RegionSizeX - 1))
+                X = ((int)m_scene.RegionInfo.RegionSizeX - 1);
+            if (Y > ((int)m_scene.RegionInfo.RegionSizeY - 1))
+                Y = ((int)m_scene.RegionInfo.RegionSizeY - 1);
             if (X < 0)
                 X = 0;
             if (Y < 0)
diff --git a/OpenSim/Region/CoreModules/World/Terrain/Effects/DefaultTerrainGenerator.cs b/OpenSim/Region/CoreModules/World/Terrain/Effects/DefaultTerrainGenerator.cs
index 7186dd7..80396c4 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/Effects/DefaultTerrainGenerator.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/Effects/DefaultTerrainGenerator.cs
@@ -42,7 +42,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain.Effects
                 for (y = 0; y < map.Height; y++)
                 {
                     map[x, y] = TerrainUtil.PerlinNoise2D(x, y, 3, 0.25) * 10;
-                    double spherFac = TerrainUtil.SphericalFactor(x, y, Constants.RegionSize / 2, Constants.RegionSize / 2, 50) * 0.01;
+                    double spherFac = TerrainUtil.SphericalFactor(x, y, map.Width / 2, map.Height / 2, 50) * 0.01;
                     if (map[x, y] < spherFac)
                     {
                         map[x, y] = spherFac;
@@ -53,4 +53,4 @@ namespace OpenSim.Region.CoreModules.World.Terrain.Effects
 
         #endregion
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs b/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs
index d78ade5..d5c77ec 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/GenericSystemDrawing.cs
@@ -67,7 +67,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
         {
             using (Bitmap bitmap = new Bitmap(filename))
             {
-                ITerrainChannel retval = new TerrainChannel(true);
+                ITerrainChannel retval = new TerrainChannel(w, h);
 
                 for (int x = 0; x < retval.Width; x++)
                 {
diff --git a/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/Terragen.cs b/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/Terragen.cs
index b5c7d33..a7e4d9f 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/Terragen.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/FileLoaders/Terragen.cs
@@ -154,10 +154,11 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
 
         public ITerrainChannel LoadStream(Stream s)
         {
-
+            // Set to default size
             int w = (int)Constants.RegionSize;
             int h = (int)Constants.RegionSize;
 
+            // create a dummy channel (in case data is bad)
             TerrainChannel retval = new TerrainChannel(w, h);
 
             BinaryReader bs = new BinaryReader(s);
@@ -165,8 +166,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
             bool eof = false;
             if (Encoding.ASCII.GetString(bs.ReadBytes(16)) == "TERRAGENTERRAIN ")
             {
-//                int fileWidth = w;
-//                int fileHeight = h;
 
                 // Terragen file
                 while (eof == false)
@@ -175,31 +174,29 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
                     switch (tmp)
                     {
                         case "SIZE":
-//                            int sztmp = bs.ReadInt16() + 1;
-//                            fileWidth = sztmp;
-//                            fileHeight = sztmp;
-                            bs.ReadInt16();
+                            w = bs.ReadInt16() + 1;
+                            h = w;
                             bs.ReadInt16();
                             break;
                         case "XPTS":
-//                            fileWidth = bs.ReadInt16();
-                            bs.ReadInt16();
+                            w = bs.ReadInt16();
                             bs.ReadInt16();
                             break;
                         case "YPTS":
-//                            fileHeight = bs.ReadInt16();
-                            bs.ReadInt16();
+                            h = bs.ReadInt16();
                             bs.ReadInt16();
                             break;
                         case "ALTW":
                             eof = true;
-                            Int16 heightScale = bs.ReadInt16();
-                            Int16 baseHeight = bs.ReadInt16();
+                            // create new channel of proper size (now that we know it)
+                            retval = new TerrainChannel(w, h);
+                            double heightScale = (double)bs.ReadInt16() / 65536.0;
+                            double baseHeight = (double)bs.ReadInt16();
                             for (int y = 0; y < h; y++)
                             {
                                 for (int x = 0; x < w; x++)
                                 {
-                                    retval[x, y] = baseHeight + bs.ReadInt16() * (double)heightScale / 65536.0;
+                                    retval[x, y] = baseHeight + (double)bs.ReadInt16() * heightScale;
                                 }
                             }
                             break;
@@ -257,17 +254,17 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
             bs.Write(enc.GetBytes("TERRAGENTERRAIN "));
 
             bs.Write(enc.GetBytes("SIZE"));
-            bs.Write(Convert.ToInt16(Constants.RegionSize));
+            bs.Write(Convert.ToInt16(map.Width));
             bs.Write(Convert.ToInt16(0));  // necessary padding
 
             //The XPTS and YPTS chunks are not needed for square regions
             //but L3DT won't load the terrain file properly without them.
             bs.Write(enc.GetBytes("XPTS"));
-            bs.Write(Convert.ToInt16(Constants.RegionSize));
+            bs.Write(Convert.ToInt16(map.Width));
             bs.Write(Convert.ToInt16(0));  // necessary padding
 
             bs.Write(enc.GetBytes("YPTS"));
-            bs.Write(Convert.ToInt16(Constants.RegionSize));
+            bs.Write(Convert.ToInt16(map.Height));
             bs.Write(Convert.ToInt16(0));  // necessary padding
 
             bs.Write(enc.GetBytes("SCAL"));
@@ -283,11 +280,13 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
             bs.Write(Convert.ToInt16(horizontalScale)); // range between max and min
             bs.Write(Convert.ToInt16(baseHeight)); // base height or mid point
 
+            double factor = 65536.0 / horizontalScale; // avoid computing this on each iteration
+
             for (int y = 0; y < map.Height; y++)
             {
                 for (int x = 0; x < map.Width; x++)
                 {
-                    float elevation = (float)((map[x,y] - baseHeight) * 65536 ) / (float)horizontalScale; // see LoadStream for inverse
+                    float elevation = (float)((map[x,y] - baseHeight) * factor); // see LoadStream for inverse
 
                     // clamp rounding issues
                     if (elevation > Int16.MaxValue)
diff --git a/OpenSim/Region/CoreModules/World/Terrain/FloodBrushes/NoiseArea.cs b/OpenSim/Region/CoreModules/World/Terrain/FloodBrushes/NoiseArea.cs
index 630473e..d3e2533 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/FloodBrushes/NoiseArea.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/FloodBrushes/NoiseArea.cs
@@ -45,7 +45,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FloodBrushes
                 {
                     if (fillArea[x, y])
                     {
-                        double noise = TerrainUtil.PerlinNoise2D((double) x / Constants.RegionSize, (double) y / Constants.RegionSize, 8, 1.0);
+                        double noise = TerrainUtil.PerlinNoise2D((double) x / map.Width, (double) y / map.Height, 8, 1.0);
 
                         map[x, y] += noise * strength;
                     }
@@ -55,4 +55,4 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FloodBrushes
 
         #endregion
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/CoreModules/World/Terrain/PaintBrushes/NoiseSphere.cs b/OpenSim/Region/CoreModules/World/Terrain/PaintBrushes/NoiseSphere.cs
index 989b7d8..e7df3f8 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/PaintBrushes/NoiseSphere.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/PaintBrushes/NoiseSphere.cs
@@ -53,7 +53,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain.PaintBrushes
                     z *= z;
                     z -= ((x - rx) * (x - rx)) + ((y - ry) * (y - ry));
 
-                    double noise = TerrainUtil.PerlinNoise2D(x / (double) Constants.RegionSize, y / (double) Constants.RegionSize, 8, 1.0);
+                    double noise = TerrainUtil.PerlinNoise2D(x / (double) map.Width, y / (double) map.Height, 8, 1.0);
 
                     if (z > 0.0)
                         map[x, y] += noise * z * duration;
diff --git a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
index 4d738a5..9a88804 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
@@ -71,6 +71,10 @@ namespace OpenSim.Region.CoreModules.World.Terrain
 
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
         
+#pragma warning disable 414
+        private static readonly string LogHeader = "[TERRAIN MODULE]";
+#pragma warning restore 414
+
         private readonly Commander m_commander = new Commander("terrain");
 
         private readonly Dictionary<StandardTerrainEffects, ITerrainFloodEffect> m_floodeffects =
@@ -81,8 +85,8 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         private readonly Dictionary<StandardTerrainEffects, ITerrainPaintableEffect> m_painteffects =
             new Dictionary<StandardTerrainEffects, ITerrainPaintableEffect>();
 
-        private ITerrainChannel m_channel;
         private Dictionary<string, ITerrainEffect> m_plugineffects;
+        private ITerrainChannel m_channel;
         private ITerrainChannel m_revert;
         private Scene m_scene;
         private volatile bool m_tainted;
@@ -90,6 +94,85 @@ namespace OpenSim.Region.CoreModules.World.Terrain
 
         private String m_InitialTerrain = "pinhead-island";
 
+        // If true, send terrain patch updates to clients based on their view distance
+        private bool m_sendTerrainUpdatesByViewDistance = true;
+
+        // Class to keep the per client collection of terrain patches that must be sent.
+        // A patch is set to 'true' meaning it should be sent to the client. Once the
+        //    patch packet is queued to the client, the bit for that patch is set to 'false'.
+        private class PatchUpdates
+        {
+            private bool[,] updated;    // for each patch, whether it needs to be sent to this client
+            private int updateCount;    // number of patches that need to be sent
+            public ScenePresence Presence;   // a reference to the client to send to
+            public PatchUpdates(TerrainData terrData, ScenePresence pPresence)
+            {
+                updated = new bool[terrData.SizeX / Constants.TerrainPatchSize, terrData.SizeY / Constants.TerrainPatchSize];
+                updateCount = 0;
+                Presence = pPresence;
+                // Initially, send all patches to the client
+                SetAll(true);
+            }
+            // Returns 'true' if there are any patches marked for sending
+            public bool HasUpdates()
+            {
+                return (updateCount > 0);
+            }
+            public void SetByXY(int x, int y, bool state)
+            {
+                this.SetByPatch(x / Constants.TerrainPatchSize, y / Constants.TerrainPatchSize, state);
+            }
+            public bool GetByPatch(int patchX, int patchY)
+            {
+                return updated[patchX, patchY];
+            }
+            public void SetByPatch(int patchX, int patchY, bool state)
+            {
+                bool prevState = updated[patchX, patchY];
+                if (!prevState && state)
+                    updateCount++;
+                if (prevState && !state)
+                    updateCount--;
+                updated[patchX, patchY] = state;
+            }
+            public void SetAll(bool state)
+            {
+                updateCount = 0;
+                for (int xx = 0; xx < updated.GetLength(0); xx++)
+                    for (int yy = 0; yy < updated.GetLength(1); yy++)
+                        updated[xx, yy] = state;
+                if (state)
+                    updateCount = updated.GetLength(0) * updated.GetLength(1);
+            }
+            // Logically OR's the terrain data's patch taint map into this client's update map.
+            public void SetAll(TerrainData terrData)
+            {
+                if (updated.GetLength(0) != (terrData.SizeX / Constants.TerrainPatchSize)
+                    || updated.GetLength(1) != (terrData.SizeY / Constants.TerrainPatchSize))
+                {
+                    throw new Exception(
+                        String.Format("{0} PatchUpdates.SetAll: patch array not same size as terrain. arr=<{1},{2}>, terr=<{3},{4}>",
+                                LogHeader, updated.GetLength(0), updated.GetLength(1),
+                                terrData.SizeX / Constants.TerrainPatchSize, terrData.SizeY / Constants.TerrainPatchSize)
+                    );
+                }
+                for (int xx = 0; xx < terrData.SizeX; xx += Constants.TerrainPatchSize)
+                {
+                    for (int yy = 0; yy < terrData.SizeY; yy += Constants.TerrainPatchSize)
+                    {
+                        // Only set tainted. The patch bit may be set if the patch was to be sent later.
+                        if (terrData.IsTaintedAt(xx, yy, false))
+                        {
+                            this.SetByXY(xx, yy, true);
+                        }
+                    }
+                }
+            }
+        }
+
+        // The flags of which terrain patches to send for each of the ScenePresence's
+        private Dictionary<UUID, PatchUpdates> m_perClientPatchUpdates = new Dictionary<UUID, PatchUpdates>();
+
         /// <summary>
         /// Human readable list of terrain file extensions that are supported.
         /// </summary>
@@ -118,7 +201,10 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         {
             IConfig terrainConfig = config.Configs["Terrain"];
             if (terrainConfig != null)
+            {
                 m_InitialTerrain = terrainConfig.GetString("InitialTerrain", m_InitialTerrain);
+                m_sendTerrainUpdatesByViewDistance = terrainConfig.GetBoolean("SendTerrainUpdatesByViewDistance", m_sendTerrainUpdatesByViewDistance);
+            }
         }
 
         public void AddRegion(Scene scene)
@@ -130,22 +216,24 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             {
                 if (m_scene.Heightmap == null)
                 {
-                    m_channel = new TerrainChannel(m_InitialTerrain);
+                    m_channel = new TerrainChannel(m_InitialTerrain, (int)m_scene.RegionInfo.RegionSizeX,
+                                                                     (int)m_scene.RegionInfo.RegionSizeY,
+                                                                     (int)m_scene.RegionInfo.RegionSizeZ);
                     m_scene.Heightmap = m_channel;
-                    m_revert = new TerrainChannel();
                     UpdateRevertMap();
                 }
                 else
                 {
                     m_channel = m_scene.Heightmap;
-                    m_revert = new TerrainChannel();
                     UpdateRevertMap();
                 }
 
                 m_scene.RegisterModuleInterface<ITerrainModule>(this);
                 m_scene.EventManager.OnNewClient += EventManager_OnNewClient;
+                m_scene.EventManager.OnClientClosed += EventManager_OnClientClosed;
                 m_scene.EventManager.OnPluginConsole += EventManager_OnPluginConsole;
                 m_scene.EventManager.OnTerrainTick += EventManager_OnTerrainTick;
+                m_scene.EventManager.OnFrame += EventManager_OnFrame;
             }
 
             InstallDefaultEffects();
@@ -184,8 +272,10 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                 // remove the commands
                 m_scene.UnregisterModuleCommander(m_commander.Name);
                 // remove the event-handlers
+                m_scene.EventManager.OnFrame -= EventManager_OnFrame;
                 m_scene.EventManager.OnTerrainTick -= EventManager_OnTerrainTick;
                 m_scene.EventManager.OnPluginConsole -= EventManager_OnPluginConsole;
+                m_scene.EventManager.OnClientClosed -= EventManager_OnClientClosed;
                 m_scene.EventManager.OnNewClient -= EventManager_OnNewClient;
                 // remove the interface
                 m_scene.UnregisterModuleInterface<ITerrainModule>(this);
@@ -230,11 +320,11 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                         try
                         {
                             ITerrainChannel channel = loader.Value.LoadFile(filename);
-                            if (channel.Width != Constants.RegionSize || channel.Height != Constants.RegionSize)
+                            if (channel.Width != m_scene.RegionInfo.RegionSizeX || channel.Height != m_scene.RegionInfo.RegionSizeY)
                             {
                                 // TerrainChannel expects a RegionSize x RegionSize map, currently
                                 throw new ArgumentException(String.Format("wrong size, use a file with size {0} x {1}",
-                                                                          Constants.RegionSize, Constants.RegionSize));
+                                                                          m_scene.RegionInfo.RegionSizeX, m_scene.RegionInfo.RegionSizeY));
                             }
                             m_log.DebugFormat("[TERRAIN]: Loaded terrain, wd/ht: {0}/{1}", channel.Width, channel.Height);
                             m_scene.Heightmap = channel;
@@ -261,7 +351,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                                 String.Format("Unable to load heightmap: {0}", e.Message));
                         }
                     }
-                    CheckForTerrainUpdates();
                     m_log.Info("[TERRAIN]: File (" + filename + ") loaded successfully");
                     return;
                 }
@@ -309,12 +398,18 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             LoadFromStream(filename, URIFetch(pathToTerrainHeightmap));
         }
 
+        public void LoadFromStream(string filename, Stream stream)
+        {
+            LoadFromStream(filename, Vector3.Zero, 0f, Vector2.Zero, stream);
+        }
+
         /// <summary>
         /// Loads a terrain file from a stream and installs it in the scene.
         /// </summary>
         /// <param name="filename">Filename to terrain file. Type is determined by extension.</param>
         /// <param name="stream"></param>
-        public void LoadFromStream(string filename, Stream stream)
+        public void LoadFromStream(string filename, Vector3 displacement,
+                                float radianRotation, Vector2 rotationDisplacement, Stream stream)
         {
             foreach (KeyValuePair<string, ITerrainLoader> loader in m_loaders)
             {
@@ -325,8 +420,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                         try
                         {
                             ITerrainChannel channel = loader.Value.LoadStream(stream);
-                            m_scene.Heightmap = channel;
-                            m_channel = channel;
+                            m_channel.Merge(channel, displacement, radianRotation, rotationDisplacement);
                             UpdateRevertMap();
                         }
                         catch (NotImplementedException)
@@ -337,7 +431,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                         }
                     }
 
-                    CheckForTerrainUpdates();
                     m_log.Info("[TERRAIN]: File (" + filename + ") loaded successfully");
                     return;
                 }
@@ -406,9 +499,46 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             }
         }
 
+        // Someone diddled terrain outside the normal code paths. Set the taintedness for all clients.
+        // ITerrainModule.TaintTerrain()
         public void TaintTerrain ()
         {
-            CheckForTerrainUpdates();
+            lock (m_perClientPatchUpdates)
+            {
+                // Set the flags for all clients so the tainted patches will be sent out
+                foreach (PatchUpdates pups in m_perClientPatchUpdates.Values)
+                {
+                    pups.SetAll(m_scene.Heightmap.GetTerrainData());
+                }
+            }
+        }
+
+        // ITerrainModule.PushTerrain()
+        public void PushTerrain(IClientAPI pClient)
+        {
+            if (m_sendTerrainUpdatesByViewDistance)
+            {
+                ScenePresence presence = m_scene.GetScenePresence(pClient.AgentId);
+                if (presence != null)
+                {
+                    lock (m_perClientPatchUpdates)
+                    {
+                        PatchUpdates pups;
+                        if (!m_perClientPatchUpdates.TryGetValue(pClient.AgentId, out pups))
+                        {
+                            // There is a ScenePresence without a send patch map. Create one.
+                            pups = new PatchUpdates(m_scene.Heightmap.GetTerrainData(), presence);
+                            m_perClientPatchUpdates.Add(presence.UUID, pups);
+                        }
+                        pups.SetAll(true);
+                    }
+                }
+            }
+            else
+            {
+                // The traditional way is to call into the protocol stack to send them all.
+                pClient.SendLayerData(new float[10]);
+            }
         }
 
         #region Plugin Loading Methods
@@ -532,6 +662,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         /// </summary>
         public void UpdateRevertMap()
         {
+            /*
             int x;
             for (x = 0; x < m_channel.Width; x++)
             {
@@ -541,6 +672,8 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                     m_revert[x, y] = m_channel[x, y];
                 }
             }
+             */
+            m_revert = m_channel.MakeCopy();
         }
 
         /// <summary>
@@ -567,8 +700,8 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                         {
                             ITerrainChannel channel = loader.Value.LoadFile(filename, offsetX, offsetY,
                                                                             fileWidth, fileHeight,
-                                                                            (int) Constants.RegionSize,
-                                                                            (int) Constants.RegionSize);
+                                                                            (int) m_scene.RegionInfo.RegionSizeX,
+                                                                            (int) m_scene.RegionInfo.RegionSizeY);
                             m_scene.Heightmap = channel;
                             m_channel = channel;
                             UpdateRevertMap();
@@ -615,8 +748,8 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                     {
                         loader.Value.SaveFile(m_channel, filename, offsetX, offsetY,
                                               fileWidth, fileHeight,
-                                              (int)Constants.RegionSize,
-                                              (int)Constants.RegionSize);
+                                              (int)m_scene.RegionInfo.RegionSizeX,
+                                              (int)m_scene.RegionInfo.RegionSizeY);
 
                         MainConsole.Instance.OutputFormat(
                             "Saved terrain from ({0},{1}) to ({2},{3}) from {4} to {5}",
@@ -634,7 +767,44 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         }
 
         /// <summary>
+        /// Called before processing of every simulation frame.
+        /// This is used to check to see of any of the terrain is tainted and, if so, schedule
+        /// updates for all the presences.
+        /// This also checks to see if there are updates that need to be sent for each presence.
+        /// This is where the logic is to send terrain updates to clients.
+        /// </summary>
+        private void EventManager_OnFrame()
+        {
+            TerrainData terrData = m_channel.GetTerrainData();
+
+            bool shouldTaint = false;
+            for (int x = 0; x < terrData.SizeX; x += Constants.TerrainPatchSize)
+            {
+                for (int y = 0; y < terrData.SizeY; y += Constants.TerrainPatchSize)
+                {
+                    if (terrData.IsTaintedAt(x, y))
+                    {
+                        // Found a patch that was modified. Push this flag into the clients.
+                        SendToClients(terrData, x, y);
+                        shouldTaint = true;
+                    }
+                }
+            }
+
+            // This event also causes changes to be sent to the clients
+            CheckSendingPatchesToClients();
+
+            // If things changes, generate some events
+            if (shouldTaint)
+            {
+                m_scene.EventManager.TriggerTerrainTainted();
+                m_tainted = true;
+            }
+        }
+
+        /// <summary>
         /// Performs updates to the region periodically, synchronising physics and other heightmap aware sections
+        /// Called infrequently (like every 5 seconds or so). Best used for storing terrain.
         /// </summary>
         private void EventManager_OnTerrainTick()
         {
@@ -644,8 +814,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                 m_scene.PhysicsScene.SetTerrain(m_channel.GetFloatsSerialised());
                 m_scene.SaveTerrain();
 
-                m_scene.EventManager.TriggerTerrainUpdate();
-
                 // Clients who look at the map will never see changes after they looked at the map, so i've commented this out.
                 //m_scene.CreateTerrainTexture(true);
             }
@@ -687,54 +855,48 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         }
         
         /// <summary>
-        /// Checks to see if the terrain has been modified since last check
-        /// but won't attempt to limit those changes to the limits specified in the estate settings
-        /// currently invoked by the command line operations in the region server only
+        /// Installs terrain brush hook to IClientAPI
         /// </summary>
-        private void CheckForTerrainUpdates()
+        /// <param name="client"></param>
+        private void EventManager_OnClientClosed(UUID client, Scene scene)
         {
-            CheckForTerrainUpdates(false);
-        }
+            ScenePresence presence = scene.GetScenePresence(client);
+            if (presence != null)
+            {
+                presence.ControllingClient.OnModifyTerrain -= client_OnModifyTerrain;
+                presence.ControllingClient.OnBakeTerrain -= client_OnBakeTerrain;
+                presence.ControllingClient.OnLandUndo -= client_OnLandUndo;
+                presence.ControllingClient.OnUnackedTerrain -= client_OnUnackedTerrain;
+            }
 
+            lock (m_perClientPatchUpdates)
+                m_perClientPatchUpdates.Remove(client);
+        }
+        
         /// <summary>
-        /// Checks to see if the terrain has been modified since last check.
-        /// If it has been modified, every all the terrain patches are sent to the client.
-        /// If the call is asked to respect the estate settings for terrain_raise_limit and
-        /// terrain_lower_limit, it will clamp terrain updates between these values
-        /// currently invoked by client_OnModifyTerrain only and not the Commander interfaces
-        /// <param name="respectEstateSettings">should height map deltas be limited to the estate settings limits</param>
+        /// Scan over changes in the terrain and limit height changes. This enforces the
+        ///     non-estate owner limits on rate of terrain editting.
+        /// Returns 'true' if any heights were limited.
         /// </summary>
-        private void CheckForTerrainUpdates(bool respectEstateSettings)
+        private bool EnforceEstateLimits()
         {
-            bool shouldTaint = false;
-            float[] serialised = m_channel.GetFloatsSerialised();
-            int x;
-            for (x = 0; x < m_channel.Width; x += Constants.TerrainPatchSize)
+            TerrainData terrData = m_channel.GetTerrainData();
+
+            bool wasLimited = false;
+            for (int x = 0; x < terrData.SizeX; x += Constants.TerrainPatchSize)
             {
-                int y;
-                for (y = 0; y < m_channel.Height; y += Constants.TerrainPatchSize)
+                for (int y = 0; y < terrData.SizeY; y += Constants.TerrainPatchSize)
                 {
-                    if (m_channel.Tainted(x, y))
-                    {
-                        // if we should respect the estate settings then
-                        // fixup and height deltas that don't respect them
-                        if (respectEstateSettings && LimitChannelChanges(x, y))
-                        {
-                            // this has been vetoed, so update
-                            // what we are going to send to the client
-                            serialised = m_channel.GetFloatsSerialised();
-                        }
-
-                        SendToClients(serialised, x, y);
-                        shouldTaint = true;
+                    if (terrData.IsTaintedAt(x, y, false /* clearOnTest */))
+                   {
+                        // If we should respect the estate settings then
+                        //     fixup and height deltas that don't respect them.
+                        // Note that LimitChannelChanges() modifies the TerrainChannel with the limited height values.
+                        wasLimited |= LimitChannelChanges(terrData, x, y);
                     }
                 }
             }
-            if (shouldTaint)
-            {
-                m_scene.EventManager.TriggerTerrainTainted();
-                m_tainted = true;
-            }
+            return wasLimited;
         }
 
         /// <summary>
@@ -742,11 +904,11 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         /// are all within the current estate limits
         /// <returns>true if changes were limited, false otherwise</returns>
         /// </summary>
-        private bool LimitChannelChanges(int xStart, int yStart)
+        private bool LimitChannelChanges(TerrainData terrData, int xStart, int yStart)
         {
             bool changesLimited = false;
-            double minDelta = m_scene.RegionInfo.RegionSettings.TerrainLowerLimit;
-            double maxDelta = m_scene.RegionInfo.RegionSettings.TerrainRaiseLimit;
+            float minDelta = (float)m_scene.RegionInfo.RegionSettings.TerrainLowerLimit;
+            float maxDelta = (float)m_scene.RegionInfo.RegionSettings.TerrainRaiseLimit;
 
             // loop through the height map for this patch and compare it against
             // the revert map
@@ -754,19 +916,18 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             {
                 for (int y = yStart; y < yStart + Constants.TerrainPatchSize; y++)
                 {
-
-                    double requestedHeight = m_channel[x, y];
-                    double bakedHeight = m_revert[x, y];
-                    double requestedDelta = requestedHeight - bakedHeight;
+                    float requestedHeight = terrData[x, y];
+                    float bakedHeight = (float)m_revert[x, y];
+                    float requestedDelta = requestedHeight - bakedHeight;
 
                     if (requestedDelta > maxDelta)
                     {
-                        m_channel[x, y] = bakedHeight + maxDelta;
+                        terrData[x, y] = bakedHeight + maxDelta;
                         changesLimited = true;
                     }
                     else if (requestedDelta < minDelta)
                     {
-                        m_channel[x, y] = bakedHeight + minDelta; //as lower is a -ve delta
+                        terrData[x, y] = bakedHeight + minDelta; //as lower is a -ve delta
                         changesLimited = true;
                     }
                 }
@@ -794,14 +955,154 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         /// <param name="serialised">A copy of the terrain as a 1D float array of size w*h</param>
         /// <param name="x">The patch corner to send</param>
         /// <param name="y">The patch corner to send</param>
-        private void SendToClients(float[] serialised, int x, int y)
+        private void SendToClients(TerrainData terrData, int x, int y)
+        {
+            if (m_sendTerrainUpdatesByViewDistance)
+            {
+                // Add that this patch needs to be sent to the accounting for each client.
+                lock (m_perClientPatchUpdates)
+                {
+                    m_scene.ForEachScenePresence(presence =>
+                        {
+                            PatchUpdates thisClientUpdates;
+                            if (!m_perClientPatchUpdates.TryGetValue(presence.UUID, out thisClientUpdates))
+                            {
+                                // There is a ScenePresence without a send patch map. Create one.
+                                thisClientUpdates = new PatchUpdates(terrData, presence);
+                                m_perClientPatchUpdates.Add(presence.UUID, thisClientUpdates);
+                            }
+                            thisClientUpdates.SetByXY(x, y, true);
+                        }
+                    );
+                }
+            }
+            else
+            {
+                // Legacy update sending where the update is sent out as soon as noticed
+                // We know the actual terrain data passed is ignored. This kludge saves changing IClientAPI.
+                //float[] heightMap = terrData.GetFloatsSerialized();
+                float[] heightMap = new float[10];
+                m_scene.ForEachClient(
+                    delegate(IClientAPI controller)
+                    {
+                        controller.SendLayerData(x / Constants.TerrainPatchSize,
+                                                 y / Constants.TerrainPatchSize,
+                                                 heightMap);
+                    }
+                );
+            }
+        }
+
+        private class PatchesToSend : IComparable<PatchesToSend>
         {
-            m_scene.ForEachClient(
-                delegate(IClientAPI controller)
-                    { controller.SendLayerData(
-                        x / Constants.TerrainPatchSize, y / Constants.TerrainPatchSize, serialised);
+            public int PatchX;
+            public int PatchY;
+            public float Dist;
+            public PatchesToSend(int pX, int pY, float pDist)
+            {
+                PatchX = pX;
+                PatchY = pY;
+                Dist = pDist;
+            }
+            public int CompareTo(PatchesToSend other)
+            {
+                return Dist.CompareTo(other.Dist);
+            }
+        }
+
+        // Called each frame time to see if there are any patches to send to any of the
+        //    ScenePresences.
+        // Loop through all the per-client info and send any patches necessary.
+        private void CheckSendingPatchesToClients()
+        {
+            lock (m_perClientPatchUpdates)
+            {
+                foreach (PatchUpdates pups in m_perClientPatchUpdates.Values)
+                {
+                    if (pups.HasUpdates())
+                    {
+                        // There is something that could be sent to this client.
+                        List<PatchesToSend> toSend = GetModifiedPatchesInViewDistance(pups);
+                        if (toSend.Count > 0)
+                        {
+                            // m_log.DebugFormat("{0} CheckSendingPatchesToClient: sending {1} patches to {2} in region {3}",
+                            //                     LogHeader, toSend.Count, pups.Presence.Name, m_scene.RegionInfo.RegionName);
+                            // Sort the patches to send by the distance from the presence
+                            toSend.Sort();
+                            /*
+                            foreach (PatchesToSend pts in toSend)
+                            {
+                                pups.Presence.ControllingClient.SendLayerData(pts.PatchX, pts.PatchY, null);
+                                // presence.ControllingClient.SendLayerData(xs.ToArray(), ys.ToArray(), null, TerrainPatch.LayerType.Land);
+                            }
+                            */
+
+                            int[] xPieces = new int[toSend.Count];
+                            int[] yPieces = new int[toSend.Count];
+                            float[] patchPieces = new float[toSend.Count * 2];
+                            int pieceIndex = 0;
+                            foreach (PatchesToSend pts in toSend)
+                            {
+                                patchPieces[pieceIndex++] = pts.PatchX;
+                                patchPieces[pieceIndex++] = pts.PatchY;
+                            }
+                            pups.Presence.ControllingClient.SendLayerData(-toSend.Count, 0, patchPieces);
+                        }
+                    }
+                }
+            }
+        }
+
+        private List<PatchesToSend> GetModifiedPatchesInViewDistance(PatchUpdates pups)
+        {
+            List<PatchesToSend> ret = new List<PatchesToSend>();
+
+            ScenePresence presence = pups.Presence;
+            if (presence == null)
+                return ret;
+
+            // Compute the area of patches within our draw distance
+            int startX = (((int) (presence.AbsolutePosition.X - presence.DrawDistance))/Constants.TerrainPatchSize) - 2;
+            startX = Math.Max(startX, 0);
+            startX = Math.Min(startX, (int)m_scene.RegionInfo.RegionSizeX/Constants.TerrainPatchSize);
+            int startY = (((int) (presence.AbsolutePosition.Y - presence.DrawDistance))/Constants.TerrainPatchSize) - 2;
+            startY = Math.Max(startY, 0);
+            startY = Math.Min(startY, (int)m_scene.RegionInfo.RegionSizeY/Constants.TerrainPatchSize);
+            int endX = (((int) (presence.AbsolutePosition.X + presence.DrawDistance))/Constants.TerrainPatchSize) + 2;
+            endX = Math.Max(endX, 0);
+            endX = Math.Min(endX, (int)m_scene.RegionInfo.RegionSizeX/Constants.TerrainPatchSize);
+            int endY = (((int) (presence.AbsolutePosition.Y + presence.DrawDistance))/Constants.TerrainPatchSize) + 2;
+            endY = Math.Max(endY, 0);
+            endY = Math.Min(endY, (int)m_scene.RegionInfo.RegionSizeY/Constants.TerrainPatchSize);
+            // m_log.DebugFormat("{0} GetModifiedPatchesInViewDistance. rName={1}, ddist={2}, apos={3}, start=<{4},{5}>, end=<{6},{7}>",
+            //                                     LogHeader, m_scene.RegionInfo.RegionName,
+            //                                     presence.DrawDistance, presence.AbsolutePosition,
+            //                                     startX, startY, endX, endY);
+            for (int x = startX; x < endX; x++)
+            {
+                for (int y = startY; y < endY; y++)
+                {
+                    //Need to make sure we don't send the same ones over and over
+                    Vector3 presencePos = presence.AbsolutePosition;
+                    Vector3 patchPos = new Vector3(x * Constants.TerrainPatchSize, y * Constants.TerrainPatchSize, presencePos.Z);
+                    if (pups.GetByPatch(x, y))
+                    {
+                        //Check which has less distance, camera or avatar position, both have to be done.
+                        //Its not a radius, its a diameter and we add 50 so that it doesn't look like it cuts off
+                        if (Util.DistanceLessThan(presencePos, patchPos, presence.DrawDistance + 50)
+                            || Util.DistanceLessThan(presence.CameraPosition, patchPos, presence.DrawDistance + 50))
+                        {
+                            //They can see it, send it to them
+                            pups.SetByPatch(x, y, false);
+                            float dist = Vector3.DistanceSquared(presencePos, patchPos);
+                            ret.Add(new PatchesToSend(x, y, dist));
+                            //Wait and send them all at once
+                            // pups.client.SendLayerData(x, y, null);
+                        }
                     }
-            );
+                }
+            }
+            return ret;
         }
 
         private void client_OnModifyTerrain(UUID user, float height, float seconds, byte size, byte action,
@@ -846,7 +1147,9 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                         m_painteffects[(StandardTerrainEffects) action].PaintEffect(
                             m_channel, allowMask, west, south, height, size, seconds);
 
-                        CheckForTerrainUpdates(!god); //revert changes outside estate limits
+                        //revert changes outside estate limits
+                        if (!god)
+                            EnforceEstateLimits();
                     }
                 }
                 else
@@ -884,10 +1187,11 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                     if (allowed)
                     {
                         StoreUndoState();
-                        m_floodeffects[(StandardTerrainEffects) action].FloodEffect(
-                            m_channel, fillArea, size);
+                        m_floodeffects[(StandardTerrainEffects) action].FloodEffect(m_channel, fillArea, size);
 
-                        CheckForTerrainUpdates(!god); //revert changes outside estate limits
+                        //revert changes outside estate limits
+                        if (!god)
+                            EnforceEstateLimits();
                     }
                 }
                 else
@@ -911,7 +1215,9 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         protected void client_OnUnackedTerrain(IClientAPI client, int patchX, int patchY)
         {
             //m_log.Debug("Terrain packet unacked, resending patch: " + patchX + " , " + patchY);
-             client.SendLayerData(patchX, patchY, m_scene.Heightmap.GetFloatsSerialised());
+            // SendLayerData does not use the heightmap parameter. This kludge is so as to not change IClientAPI.
+            float[] heightMap = new float[10];
+            client.SendLayerData(patchX, patchY, heightMap);
         }
 
         private void StoreUndoState()
@@ -938,7 +1244,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         private void InterfaceLoadFile(Object[] args)
         {
             LoadFromFile((string) args[0]);
-            CheckForTerrainUpdates();
         }
 
         private void InterfaceLoadTileFile(Object[] args)
@@ -948,7 +1253,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                          (int) args[2],
                          (int) args[3],
                          (int) args[4]);
-            CheckForTerrainUpdates();
         }
 
         private void InterfaceSaveFile(Object[] args)
@@ -977,7 +1281,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                 for (y = 0; y < m_channel.Height; y++)
                     m_channel[x, y] = m_revert[x, y];
 
-            CheckForTerrainUpdates();
         }
 
         private void InterfaceFlipTerrain(Object[] args)
@@ -986,28 +1289,28 @@ namespace OpenSim.Region.CoreModules.World.Terrain
 
             if (direction.ToLower().StartsWith("y"))
             {
-                for (int x = 0; x < Constants.RegionSize; x++)
+                for (int x = 0; x < m_channel.Width; x++)
                 {
-                    for (int y = 0; y < Constants.RegionSize / 2; y++)
+                    for (int y = 0; y < m_channel.Height / 2; y++)
                     {
                         double height = m_channel[x, y];
-                        double flippedHeight = m_channel[x, (int)Constants.RegionSize - 1 - y];
+                        double flippedHeight = m_channel[x, (int)m_channel.Height - 1 - y];
                         m_channel[x, y] = flippedHeight;
-                        m_channel[x, (int)Constants.RegionSize - 1 - y] = height;
+                        m_channel[x, (int)m_channel.Height - 1 - y] = height;
 
                     }
                 }
             }
             else if (direction.ToLower().StartsWith("x"))
             {
-                for (int y = 0; y < Constants.RegionSize; y++)
+                for (int y = 0; y < m_channel.Height; y++)
                 {
-                    for (int x = 0; x < Constants.RegionSize / 2; x++)
+                    for (int x = 0; x < m_channel.Width / 2; x++)
                     {
                         double height = m_channel[x, y];
-                        double flippedHeight = m_channel[(int)Constants.RegionSize - 1 - x, y];
+                        double flippedHeight = m_channel[(int)m_channel.Width - 1 - x, y];
                         m_channel[x, y] = flippedHeight;
-                        m_channel[(int)Constants.RegionSize - 1 - x, y] = height;
+                        m_channel[(int)m_channel.Width - 1 - x, y] = height;
 
                     }
                 }
@@ -1016,9 +1319,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             {
                 m_log.Error("Unrecognised direction - need x or y");
             }
-
-
-            CheckForTerrainUpdates();
         }
 
         private void InterfaceRescaleTerrain(Object[] args)
@@ -1076,7 +1376,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                     }
                 }
 
-                CheckForTerrainUpdates();
             }
 
         }
@@ -1087,7 +1386,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             for (x = 0; x < m_channel.Width; x++)
                 for (y = 0; y < m_channel.Height; y++)
                     m_channel[x, y] += (double) args[0];
-            CheckForTerrainUpdates();
         }
 
         private void InterfaceMultiplyTerrain(Object[] args)
@@ -1096,7 +1394,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             for (x = 0; x < m_channel.Width; x++)
                 for (y = 0; y < m_channel.Height; y++)
                     m_channel[x, y] *= (double) args[0];
-            CheckForTerrainUpdates();
         }
 
         private void InterfaceLowerTerrain(Object[] args)
@@ -1105,17 +1402,15 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             for (x = 0; x < m_channel.Width; x++)
                 for (y = 0; y < m_channel.Height; y++)
                     m_channel[x, y] -= (double) args[0];
-            CheckForTerrainUpdates();
         }
 
-        private void InterfaceFillTerrain(Object[] args)
+        public void InterfaceFillTerrain(Object[] args)
         {
             int x, y;
 
             for (x = 0; x < m_channel.Width; x++)
                 for (y = 0; y < m_channel.Height; y++)
                     m_channel[x, y] = (double) args[0];
-            CheckForTerrainUpdates();
         }
 
         private void InterfaceMinTerrain(Object[] args)
@@ -1128,7 +1423,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                     m_channel[x, y] = Math.Max((double)args[0], m_channel[x, y]);
                 }
             }
-            CheckForTerrainUpdates();
         }
 
         private void InterfaceMaxTerrain(Object[] args)
@@ -1141,7 +1435,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                     m_channel[x, y] = Math.Min((double)args[0], m_channel[x, y]);
                 }
             }
-            CheckForTerrainUpdates();
         }
 
         private void InterfaceShowDebugStats(Object[] args)
@@ -1204,7 +1497,6 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             if (m_plugineffects.ContainsKey(firstArg))
             {
                 m_plugineffects[firstArg].RunEffect(m_channel);
-                CheckForTerrainUpdates();
             }
             else
             {
diff --git a/OpenSim/Region/CoreModules/World/Terrain/Tests/TerrainTest.cs b/OpenSim/Region/CoreModules/World/Terrain/Tests/TerrainTest.cs
index be719ea..062d7ff 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/Tests/TerrainTest.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/Tests/TerrainTest.cs
@@ -40,10 +40,13 @@ namespace OpenSim.Region.CoreModules.World.Terrain.Tests
         [Test]
         public void BrushTest()
         {
+            int midRegion = (int)Constants.RegionSize / 2;
+
+            // Create a mask that covers only the left half of the region
             bool[,] allowMask = new bool[(int)Constants.RegionSize, 256];
             int x;
             int y;
-            for (x = 0; x < (int)((int)Constants.RegionSize * 0.5f); x++)
+            for (x = 0; x < midRegion; x++)
             {
                 for (y = 0; y < (int)Constants.RegionSize; y++)
                 {
@@ -57,13 +60,12 @@ namespace OpenSim.Region.CoreModules.World.Terrain.Tests
             TerrainChannel map = new TerrainChannel((int)Constants.RegionSize, (int)Constants.RegionSize);
             ITerrainPaintableEffect effect = new RaiseSphere();
 
-            effect.PaintEffect(map, allowMask, (int)Constants.RegionSize * 0.5f, (int)Constants.RegionSize * 0.5f, -1.0, 2, 0.1);
-            Assert.That(map[127, (int)((int)Constants.RegionSize * 0.5f)] > 0.0, "Raise brush should raising value at this point (127,128).");
-            Assert.That(map[124, (int)((int)Constants.RegionSize * 0.5f)] > 0.0, "Raise brush should raising value at this point (124,128).");
-            Assert.That(map[123, (int)((int)Constants.RegionSize * 0.5f)] == 0.0, "Raise brush should not change value at this point (123,128).");
-            Assert.That(map[128, (int)((int)Constants.RegionSize * 0.5f)] == 0.0, "Raise brush should not change value at this point (128,128).");
-            Assert.That(map[0, (int)((int)Constants.RegionSize * 0.5f)] == 0.0, "Raise brush should not change value at this point (0,128).");
-
+            effect.PaintEffect(map, allowMask, midRegion, midRegion, -1.0, 2, 6.0);
+            Assert.That(map[127, midRegion] > 0.0, "Raise brush should raising value at this point (127,128).");
+            Assert.That(map[125, midRegion] > 0.0, "Raise brush should raising value at this point (124,128).");
+            Assert.That(map[120, midRegion] == 0.0, "Raise brush should not change value at this point (120,128).");
+            Assert.That(map[128, midRegion] == 0.0, "Raise brush should not change value at this point (128,128).");
+            Assert.That(map[0, midRegion] == 0.0, "Raise brush should not change value at this point (0,128).");
             //
             // Test LowerSphere
             //
@@ -77,13 +79,13 @@ namespace OpenSim.Region.CoreModules.World.Terrain.Tests
             }
             effect = new LowerSphere();
 
-            effect.PaintEffect(map, allowMask, ((int)Constants.RegionSize * 0.5f), ((int)Constants.RegionSize * 0.5f), -1.0, 2, 6.0);
-            Assert.That(map[127, (int)((int)Constants.RegionSize * 0.5f)] >= 0.0, "Lower should not lowering value below 0.0 at this point (127,128).");
-            Assert.That(map[127, (int)((int)Constants.RegionSize * 0.5f)] == 0.0, "Lower brush should lowering value to 0.0 at this point (127,128).");
-            Assert.That(map[124, (int)((int)Constants.RegionSize * 0.5f)] < 1.0, "Lower brush should lowering value at this point (124,128).");
-            Assert.That(map[123, (int)((int)Constants.RegionSize * 0.5f)] == 1.0, "Lower brush should not change value at this point (123,128).");
-            Assert.That(map[128, (int)((int)Constants.RegionSize * 0.5f)] == 1.0, "Lower brush should not change value at this point (128,128).");
-            Assert.That(map[0, (int)((int)Constants.RegionSize * 0.5f)] == 1.0, "Lower brush should not change value at this point (0,128).");
+            effect.PaintEffect(map, allowMask, midRegion, midRegion, -1.0, 2, 6.0);
+            Assert.That(map[127, midRegion] >= 0.0, "Lower should not lowering value below 0.0 at this point (127,128).");
+            Assert.That(map[127, midRegion] == 0.0, "Lower brush should lowering value to 0.0 at this point (127,128).");
+            Assert.That(map[125, midRegion] < 1.0, "Lower brush should lowering value at this point (124,128).");
+            Assert.That(map[120, midRegion] == 1.0, "Lower brush should not change value at this point (120,128).");
+            Assert.That(map[128, midRegion] == 1.0, "Lower brush should not change value at this point (128,128).");
+            Assert.That(map[0, midRegion] == 1.0, "Lower brush should not change value at this point (0,128).");
         }
 
         [Test]
diff --git a/OpenSim/Region/Framework/Interfaces/IRegionCombinerModule.cs b/OpenSim/Region/Framework/Interfaces/IRegionCombinerModule.cs
index e03ac5a..c6f531e 100644
--- a/OpenSim/Region/Framework/Interfaces/IRegionCombinerModule.cs
+++ b/OpenSim/Region/Framework/Interfaces/IRegionCombinerModule.cs
@@ -55,5 +55,10 @@ namespace OpenSim.Region.Framework.Interfaces
         /// Currently, will throw an exception if this does not match a root region.
         /// </param>
         Vector2 GetSizeOfMegaregion(UUID regionId);
+
+        /// <summary>
+        /// Tests to see of position (relative to the region) is within the megaregion
+        /// </summary>
+        bool PositionIsInMegaregion(UUID currentRegion, int xx, int yy);
     }
 }
\ No newline at end of file
diff --git a/OpenSim/Region/Framework/Interfaces/ISimulationDataService.cs b/OpenSim/Region/Framework/Interfaces/ISimulationDataService.cs
index 3e97a7a..13358cb 100644
--- a/OpenSim/Region/Framework/Interfaces/ISimulationDataService.cs
+++ b/OpenSim/Region/Framework/Interfaces/ISimulationDataService.cs
@@ -68,13 +68,22 @@ namespace OpenSim.Region.Framework.Interfaces
         /// </summary>
         /// <param name="ter">HeightField data</param>
         /// <param name="regionID">region UUID</param>
+        void StoreTerrain(TerrainData terrain, UUID regionID);
+
+        // Legacy version kept for downward compabibility
         void StoreTerrain(double[,] terrain, UUID regionID);
 
         /// <summary>
         /// Load the latest terrain revision from region storage
         /// </summary>
         /// <param name="regionID">the region UUID</param>
+        /// <param name="sizeX">the X dimension of the region being filled</param>
+        /// <param name="sizeY">the Y dimension of the region being filled</param>
+        /// <param name="sizeZ">the Z dimension of the region being filled</param>
         /// <returns>Heightfield data</returns>
+        TerrainData LoadTerrain(UUID regionID, int pSizeX, int pSizeY, int pSizeZ);
+
+        // Legacy version kept for downward compabibility
         double[,] LoadTerrain(UUID regionID);
 
         void StoreLandObject(ILandObject Parcel);
diff --git a/OpenSim/Region/Framework/Interfaces/ISimulationDataStore.cs b/OpenSim/Region/Framework/Interfaces/ISimulationDataStore.cs
index 17bd48b..e09f775 100644
--- a/OpenSim/Region/Framework/Interfaces/ISimulationDataStore.cs
+++ b/OpenSim/Region/Framework/Interfaces/ISimulationDataStore.cs
@@ -79,13 +79,22 @@ namespace OpenSim.Region.Framework.Interfaces
         /// </summary>
         /// <param name="ter">HeightField data</param>
         /// <param name="regionID">region UUID</param>
+        void StoreTerrain(TerrainData terrain, UUID regionID);
+
+        // Legacy version kept for downward compabibility
         void StoreTerrain(double[,] terrain, UUID regionID);
         
         /// <summary>
         /// Load the latest terrain revision from region storage
         /// </summary>
         /// <param name="regionID">the region UUID</param>
+        /// <param name="pSizeX">the X dimension of the terrain being filled</param>
+        /// <param name="pSizeY">the Y dimension of the terrain being filled</param>
+        /// <param name="pSizeZ">the Z dimension of the terrain being filled</param>
         /// <returns>Heightfield data</returns>
+        TerrainData LoadTerrain(UUID regionID, int pSizeX, int pSizeY, int pSizeZ);
+
+        // Legacy version kept for downward compabibility
         double[,] LoadTerrain(UUID regionID);
 
         void StoreLandObject(ILandObject Parcel);
@@ -136,4 +145,5 @@ namespace OpenSim.Region.Framework.Interfaces
 
         void Shutdown();
     }
+
 }
diff --git a/OpenSim/Region/Framework/Interfaces/ITerrainChannel.cs b/OpenSim/Region/Framework/Interfaces/ITerrainChannel.cs
index e467701..f660b8d 100644
--- a/OpenSim/Region/Framework/Interfaces/ITerrainChannel.cs
+++ b/OpenSim/Region/Framework/Interfaces/ITerrainChannel.cs
@@ -25,13 +25,23 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+using OpenSim.Framework;
+using OpenMetaverse;
+
 namespace OpenSim.Region.Framework.Interfaces
 {
     public interface ITerrainChannel
     {
-        int Height { get; }
+        int Width { get;}       // X dimension
+        int Height { get;}      // Y dimension
+        int Altitude { get;}    // Z dimension
+
         double this[int x, int y] { get; set; }
-        int Width { get; }
+
+        float GetHeightAtXYZ(float x, float y, float z);
+
+        // Return the packaged terrain data for passing into lower levels of communication
+        TerrainData GetTerrainData();
 
         /// <summary>
         /// Squash the entire heightmap into a single dimensioned array
@@ -40,9 +50,14 @@ namespace OpenSim.Region.Framework.Interfaces
         float[] GetFloatsSerialised();
 
         double[,] GetDoubles();
+
+        // Check if a location has been updated. Clears the taint flag as a side effect.
         bool Tainted(int x, int y);
+
         ITerrainChannel MakeCopy();
         string SaveToXmlString();
         void LoadFromXmlString(string data);
+        // Merge some terrain into this channel
+        void Merge(ITerrainChannel newTerrain, Vector3 displacement, float radianRotation, Vector2 rotationDisplacement);
     }
 }
diff --git a/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs b/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs
index b45cc4d..4ab5a4a 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs
@@ -2221,14 +2221,9 @@ namespace OpenSim.Region.Framework.Scenes
             itemID = UUID.Zero;
             if (grp != null)
             {
-                Vector3 inventoryStoredPosition = new Vector3
-                       (((grp.AbsolutePosition.X > (int)Constants.RegionSize)
-                             ? 250
-                             : grp.AbsolutePosition.X)
-                        ,
-                        (grp.AbsolutePosition.X > (int)Constants.RegionSize)
-                            ? 250
-                            : grp.AbsolutePosition.X,
+                Vector3 inventoryStoredPosition = new Vector3(
+                        Math.Min(grp.AbsolutePosition.X, RegionInfo.RegionSizeX - 6),
+                        Math.Min(grp.AbsolutePosition.Y, RegionInfo.RegionSizeY - 6),
                         grp.AbsolutePosition.Z);
 
                 Vector3 originalPosition = grp.AbsolutePosition;
diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index eb34f55..46c9048 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -6,7 +6,7 @@
  * modification, are permitted provided that the following conditions are met:
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above copyrightD
+ *     * Redistributions in binary form must reproduce the above copyright
  *       notice, this list of conditions and the following disclaimer in the
  *       documentation and/or other materials provided with the distribution.
  *     * Neither the name of the OpenSimulator Project nor the
@@ -103,7 +103,29 @@ namespace OpenSim.Region.Framework.Scenes
         /// <summary>
         /// If false then physical objects are disabled, though collisions will continue as normal.
         /// </summary>
-        public bool PhysicsEnabled { get; set; }
+        public bool PhysicsEnabled 
+        { 
+            get 
+            {
+                return m_physicsEnabled;
+            }
+
+            set
+            {
+                m_physicsEnabled = value;
+
+                if (PhysicsScene != null)
+                {
+                    IPhysicsParameters physScene = PhysicsScene as IPhysicsParameters;
+
+                    if (physScene != null)
+                        physScene.SetPhysicsParameter(
+                            "Active", m_physicsEnabled.ToString(), PhysParameterEntry.APPLY_TO_NONE);
+                }
+            }
+        }
+
+        private bool m_physicsEnabled;
 
         /// <summary>
         /// If false then scripts are not enabled on the smiulator
@@ -160,11 +182,6 @@ namespace OpenSim.Region.Framework.Scenes
         /// </summary>
         public SimStatsReporter StatsReporter { get; private set; }
 
-        public List<Border> NorthBorders = new List<Border>();
-        public List<Border> EastBorders = new List<Border>();
-        public List<Border> SouthBorders = new List<Border>();
-        public List<Border> WestBorders = new List<Border>();
-
         /// <summary>
         /// Controls whether physics can be applied to prims.  Even if false, prims still have entries in a
         /// PhysicsScene in order to perform collision detection
@@ -204,15 +221,16 @@ namespace OpenSim.Region.Framework.Scenes
         /// </summary>
         public int m_linksetCapacity = 0;
 
+        public bool m_clampPrimSize;
+        public bool m_trustBinaries;
+        public bool m_allowScriptCrossings = true;
+
         /// <summary>
         /// Max prims an Physical object will hold
         /// </summary>
         /// 
         public int m_linksetPhysCapacity = 0;
 
-        public bool m_clampPrimSize;
-        public bool m_trustBinaries;
-        public bool m_allowScriptCrossings;
         public bool m_useFlySlow;
         public bool m_useTrashOnDelete = true;
 
@@ -364,7 +382,6 @@ namespace OpenSim.Region.Framework.Scenes
 
         // TODO: Possibly stop other classes being able to manipulate this directly.
         private SceneGraph m_sceneGraph;
-        private volatile int m_bordersLocked;
         private readonly Timer m_restartTimer = new Timer(15000); // Wait before firing
         private volatile bool m_backingup;
         private Dictionary<UUID, ReturnInfo> m_returns = new Dictionary<UUID, ReturnInfo>();
@@ -446,18 +463,6 @@ namespace OpenSim.Region.Framework.Scenes
             set { m_splitRegionID = value; }
         }
 
-        public bool BordersLocked
-        {
-            get { return m_bordersLocked == 1; }
-            set
-            {
-                if (value == true)
-                    m_bordersLocked = 1;
-                else
-                    m_bordersLocked = 0;
-            }
-        }
-        
         public new float TimeDilation
         {
             get { return m_sceneGraph.PhysicsScene.TimeDilation; }
@@ -1075,28 +1080,6 @@ namespace OpenSim.Region.Framework.Scenes
             PeriodicBackup = true;
             UseBackup = true;
 
-            BordersLocked = true;
-            Border northBorder = new Border();
-            northBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, RegionInfo.RegionSizeY);  //<---
-            northBorder.CrossDirection = Cardinals.N;
-            NorthBorders.Add(northBorder);
-
-            Border southBorder = new Border();
-            southBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue,0);    //--->
-            southBorder.CrossDirection = Cardinals.S;
-            SouthBorders.Add(southBorder);
-
-            Border eastBorder = new Border();
-            eastBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, RegionInfo.RegionSizeX);   //<---
-            eastBorder.CrossDirection = Cardinals.E;
-            EastBorders.Add(eastBorder);
-
-            Border westBorder = new Border();
-            westBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue,0);     //--->
-            westBorder.CrossDirection = Cardinals.W;
-            WestBorders.Add(westBorder);
-            BordersLocked = false;
-
             m_eventManager = new EventManager();
 
             m_permissions = new ScenePermissions(this);
@@ -1975,7 +1958,7 @@ namespace OpenSim.Region.Framework.Scenes
         {
             try
             {
-                double[,] map = SimulationDataService.LoadTerrain(RegionInfo.RegionID);
+                TerrainData map = SimulationDataService.LoadTerrain(RegionInfo.RegionID, (int)RegionInfo.RegionSizeX, (int)RegionInfo.RegionSizeY, (int)RegionInfo.RegionSizeZ);
                 if (map == null)
                 {
                     // This should be in the Terrain module, but it isn't because
@@ -1986,7 +1969,7 @@ namespace OpenSim.Region.Framework.Scenes
                         m_InitialTerrain = terrainConfig.GetString("InitialTerrain", m_InitialTerrain);
 
                     m_log.InfoFormat("[TERRAIN]: No default terrain. Generating a new terrain {0}.", m_InitialTerrain);
-                    Heightmap = new TerrainChannel(m_InitialTerrain);
+                    Heightmap = new TerrainChannel(m_InitialTerrain, (int)RegionInfo.RegionSizeX, (int)RegionInfo.RegionSizeY, (int)RegionInfo.RegionSizeZ);
 
                     SimulationDataService.StoreTerrain(Heightmap.GetDoubles(), RegionInfo.RegionID);
                 }
@@ -2611,185 +2594,35 @@ namespace OpenSim.Region.Framework.Scenes
                 EntityTransferModule.Cross(grp, attemptedPosition, silent);
         }
 
-        public Border GetCrossedBorder(Vector3 position, Cardinals gridline)
+        // Simple test to see if a position is in the current region.
+        // This test is mostly used to see if a region crossing is necessary.
+        // Assuming the position is relative to the region so anything outside its bounds.
+        // Return 'true' if position inside region.
+        public bool PositionIsInCurrentRegion(Vector3 pos)
         {
-            if (BordersLocked)
-            {
-                switch (gridline)
-                {
-                    case Cardinals.N:
-                        lock (NorthBorders)
-                        {
-                            foreach (Border b in NorthBorders)
-                            {
-                                if (b.TestCross(position))
-                                    return b;
-                            }
-                        }
-                        break;
-                    case Cardinals.S:
-                        lock (SouthBorders)
-                        {
-                            foreach (Border b in SouthBorders)
-                            {
-                                if (b.TestCross(position))
-                                    return b;
-                            }
-                        }
-
-                        break;
-                    case Cardinals.E:
-                        lock (EastBorders)
-                        {
-                            foreach (Border b in EastBorders)
-                            {
-                                if (b.TestCross(position))
-                                    return b;
-                            }
-                        }
-
-                        break;
-                    case Cardinals.W:
-
-                        lock (WestBorders)
-                        {
-                            foreach (Border b in WestBorders)
-                            {
-                                if (b.TestCross(position))
-                                    return b;
-                            }
-                        }
-                        break;
+            bool ret = false;
+            int xx = (int)Math.Floor(pos.X);
+            int yy = (int)Math.Floor(pos.Y);
+            if (xx < 0 || yy < 0)
+                return false;
 
-                }
+            IRegionCombinerModule regionCombinerModule = RequestModuleInterface<IRegionCombinerModule>();
+            if (regionCombinerModule == null)
+            {
+                // Regular region. Just check for region size
+                if (xx < RegionInfo.RegionSizeX && yy < RegionInfo.RegionSizeY )
+                    ret = true;
             }
             else
             {
-                switch (gridline)
-                {
-                    case Cardinals.N:
-                        foreach (Border b in NorthBorders)
-                        {
-                            if (b.TestCross(position))
-                                return b;
-                        }
-                       
-                        break;
-                    case Cardinals.S:
-                        foreach (Border b in SouthBorders)
-                        {
-                            if (b.TestCross(position))
-                                return b;
-                        }
-                        break;
-                    case Cardinals.E:
-                        foreach (Border b in EastBorders)
-                        {
-                            if (b.TestCross(position))
-                                return b;
-                        }
-
-                        break;
-                    case Cardinals.W:
-                        foreach (Border b in WestBorders)
-                        {
-                            if (b.TestCross(position))
-                                return b;
-                        }
-                        break;
-
-                }
+                // We're in a mega-region so see if we are still in that larger region
+                ret = regionCombinerModule.PositionIsInMegaregion(this.RegionInfo.RegionID, xx, yy);
             }
 
-            return null;
-        }
+            return ret;
 
-        public bool TestBorderCross(Vector3 position, Cardinals border)
-        {
-            if (BordersLocked)
-            {
-                switch (border)
-                {
-                    case Cardinals.N:
-                        lock (NorthBorders)
-                        {
-                            foreach (Border b in NorthBorders)
-                            {
-                                if (b.TestCross(position))
-                                    return true;
-                            }
-                        }
-                        break;
-                    case Cardinals.E:
-                        lock (EastBorders)
-                        {
-                            foreach (Border b in EastBorders)
-                            {
-                                if (b.TestCross(position))
-                                    return true;
-                            }
-                        }
-                        break;
-                    case Cardinals.S:
-                        lock (SouthBorders)
-                        {
-                            foreach (Border b in SouthBorders)
-                            {
-                                if (b.TestCross(position))
-                                    return true;
-                            }
-                        }
-                        break;
-                    case Cardinals.W:
-                        lock (WestBorders)
-                        {
-                            foreach (Border b in WestBorders)
-                            {
-                                if (b.TestCross(position))
-                                    return true;
-                            }
-                        }
-                        break;
-                }
-            }
-            else
-            {
-                switch (border)
-                {
-                    case Cardinals.N:
-                        foreach (Border b in NorthBorders)
-                        {
-                            if (b.TestCross(position))
-                                return true;
-                        }
-                        break;
-                    case Cardinals.E:
-                        foreach (Border b in EastBorders)
-                        {
-                            if (b.TestCross(position))
-                                return true;
-                        }
-                        break;
-                    case Cardinals.S:
-                        foreach (Border b in SouthBorders)
-                        {
-                            if (b.TestCross(position))
-                                return true;
-                        }
-                        break;
-                    case Cardinals.W:
-                        foreach (Border b in WestBorders)
-                        {
-                            if (b.TestCross(position))
-                                return true;
-                        }
-                        break;
-                }
-            }
-            return false;
         }
 
-
         /// <summary>
         /// Called when objects or attachments cross the border, or teleport, between regions.
         /// </summary>
@@ -4116,60 +3949,11 @@ namespace OpenSim.Region.Framework.Scenes
             {
 //                CleanDroppedAttachments();
 
-                if (TestBorderCross(acd.startpos, Cardinals.E))
-                {
-                    Border crossedBorder = GetCrossedBorder(acd.startpos, Cardinals.E);
-                    acd.startpos.X = crossedBorder.BorderLine.Z - 1;
-                }
-
-                if (TestBorderCross(acd.startpos, Cardinals.N))
-                {
-                    Border crossedBorder = GetCrossedBorder(acd.startpos, Cardinals.N);
-                    acd.startpos.Y = crossedBorder.BorderLine.Z - 1;
-                }
-
-                //Mitigate http://opensimulator.org/mantis/view.php?id=3522
-                // Check if start position is outside of region
-                // If it is, check the Z start position also..   if not, leave it alone.
-                if (BordersLocked)
-                {
-                    lock (EastBorders)
-                    {
-                        if (acd.startpos.X > EastBorders[0].BorderLine.Z)
-                        {
-                            m_log.Warn("FIX AGENT POSITION");
-                            acd.startpos.X = EastBorders[0].BorderLine.Z * 0.5f;
-                            if (acd.startpos.Z > 720)
-                                acd.startpos.Z = 720;
-                        }
-                    }
-                    lock (NorthBorders)
-                    {
-                        if (acd.startpos.Y > NorthBorders[0].BorderLine.Z)
-                        {
-                            m_log.Warn("FIX Agent POSITION");
-                            acd.startpos.Y = NorthBorders[0].BorderLine.Z * 0.5f;
-                            if (acd.startpos.Z > 720)
-                                acd.startpos.Z = 720;
-                        }
-                    }
-                } else
-                {
-                    if (acd.startpos.X > EastBorders[0].BorderLine.Z)
-                    {
-                        m_log.Warn("FIX AGENT POSITION");
-                        acd.startpos.X = EastBorders[0].BorderLine.Z * 0.5f;
-                        if (acd.startpos.Z > 720)
-                            acd.startpos.Z = 720;
-                    }
-                    if (acd.startpos.Y > NorthBorders[0].BorderLine.Z)
-                    {
-                        m_log.Warn("FIX Agent POSITION");
-                        acd.startpos.Y = NorthBorders[0].BorderLine.Z * 0.5f;
-                        if (acd.startpos.Z > 720)
-                            acd.startpos.Z = 720;
-                    }
-                }
+                // Make sure avatar position is in the region (why it wouldn't be is a mystery but do sanity checking)
+                if (acd.startpos.X < 0) acd.startpos.X = 1f;
+                if (acd.startpos.X >= RegionInfo.RegionSizeX) acd.startpos.X = RegionInfo.RegionSizeX - 1f;
+                if (acd.startpos.Y < 0) acd.startpos.Y = 1f;
+                if (acd.startpos.Y >= RegionInfo.RegionSizeY) acd.startpos.Y = RegionInfo.RegionSizeY - 1f;
 
 //                m_log.DebugFormat(
 //                    "[SCENE]: Found telehub object {0} for new user connection {1} to {2}", 
@@ -4883,44 +4667,6 @@ namespace OpenSim.Region.Framework.Scenes
             ScenePresence sp = GetScenePresence(remoteClient.AgentId);
             if (sp != null)
             {
-                uint regionX = RegionInfo.RegionLocX;
-                uint regionY = RegionInfo.RegionLocY;
-
-                Utils.LongToUInts(regionHandle, out regionX, out regionY);
-
-                int shiftx = (int) regionX - (int) RegionInfo.RegionLocX * (int)Constants.RegionSize;
-                int shifty = (int) regionY - (int) RegionInfo.RegionLocY * (int)Constants.RegionSize;
-
-                position.X += shiftx;
-                position.Y += shifty;
-
-                bool result = false;
-
-                if (TestBorderCross(position,Cardinals.N))
-                    result = true;
-
-                if (TestBorderCross(position, Cardinals.S))
-                    result = true;
-
-                if (TestBorderCross(position, Cardinals.E))
-                    result = true;
-
-                if (TestBorderCross(position, Cardinals.W))
-                    result = true;
-
-                // bordercross if position is outside of region
-
-                if (!result)
-                {
-                    regionHandle = RegionInfo.RegionHandle;
-                }
-                else
-                {
-                    // not in this region, undo the shift!
-                    position.X -= shiftx;
-                    position.Y -= shifty;
-                }
-
                 if (EntityTransferModule != null)
                 {
                     EntityTransferModule.Teleport(sp, regionHandle, position, lookAt, teleportFlags);
diff --git a/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs b/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
index 52f46f2..a2625c4 100644
--- a/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
@@ -52,6 +52,7 @@ namespace OpenSim.Region.Framework.Scenes
     public class SceneCommunicationService //one instance per region
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static string LogHeader = "[SCENE COMMUNICATION SERVICE]";
 
         protected RegionInfo m_regionInfo;
         protected Scene m_scene;
@@ -100,7 +101,7 @@ namespace OpenSim.Region.Framework.Scenes
             {
                 m_log.WarnFormat(
                     "[SCENE COMMUNICATION SERVICE]: Region {0} failed to inform neighbour at {1}-{2} that it is up.",
-                    m_scene.Name, x / Constants.RegionSize, y / Constants.RegionSize);
+                    m_scene.Name, Util.WorldToRegionLoc(x), Util.WorldToRegionLoc(y));
             }
         }
 
@@ -166,7 +167,7 @@ namespace OpenSim.Region.Framework.Scenes
                         // we only want to send one update to each simulator; the simulator will
                         // hand it off to the regions where a child agent exists, this does assume
                         // that the region position is cached or performance will degrade
-                        Utils.LongToUInts(regionHandle, out x, out y);
+                        Util.RegionHandleToWorldLoc(regionHandle, out x, out y);
                         GridRegion dest = m_scene.GridService.GetRegionByPosition(UUID.Zero, (int)x, (int)y);
                         if (dest == null)
                             continue;
@@ -206,7 +207,7 @@ namespace OpenSim.Region.Framework.Scenes
 
             //m_commsProvider.InterRegion.TellRegionToCloseChildConnection(regionHandle, agentID);
             uint x = 0, y = 0;
-            Utils.LongToUInts(regionHandle, out x, out y);
+            Util.RegionHandleToWorldLoc(regionHandle, out x, out y);
 
             GridRegion destination = m_scene.GridService.GetRegionByPosition(m_regionInfo.ScopeID, (int)x, (int)y);
 
@@ -226,6 +227,8 @@ namespace OpenSim.Region.Framework.Scenes
         {
             foreach (ulong handle in regionslst)
             {
+                // We must take a copy here since handle acts like a reference when used in an iterator.
+                // This leads to race conditions if directly passed to SendCloseChildAgent with more than one neighbour region.
                 ulong handleCopy = handle;
                 Util.FireAndForget((o) => { SendCloseChildAgent(agentID, handleCopy, auth_code); });
             }
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
index 89c7a1a..cb2f377 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
@@ -412,7 +412,7 @@ namespace OpenSim.Region.Framework.Scenes
         {
             get
             {
-                Vector3 minScale = new Vector3(Constants.RegionSize, Constants.RegionSize, Constants.RegionSize);
+                Vector3 minScale = new Vector3(Constants.MaximumRegionSize, Constants.MaximumRegionSize, Constants.MaximumRegionSize);
                 Vector3 maxScale = Vector3.Zero;
                 Vector3 finalScale = new Vector3(0.5f, 0.5f, 0.5f);
     
@@ -529,12 +529,10 @@ namespace OpenSim.Region.Framework.Scenes
             set
             {
                 Vector3 val = value;
-                if (Scene != null && !IsAttachmentCheckFull()
-                    && !Scene.LoadingPrims &&
-                    (Scene.TestBorderCross(val, Cardinals.E) ||
-                      Scene.TestBorderCross(val, Cardinals.W) ||
-                      Scene.TestBorderCross(val, Cardinals.N) ||
-                      Scene.TestBorderCross(val, Cardinals.S))
+                if (Scene != null
+                        && Scene.PositionIsInCurrentRegion(val)
+                        && !IsAttachmentCheckFull()
+                        && !Scene.LoadingPrims
                     )
                 {
                     if (!inTransit)
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
index 91293c4..8979659 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
@@ -2979,10 +2979,7 @@ namespace OpenSim.Region.Framework.Scenes
             {
                 Vector3 newpos = new Vector3(pa.Position.GetBytes(), 0);
                 
-                if (ParentGroup.Scene.TestBorderCross(newpos, Cardinals.N)
-                    || ParentGroup.Scene.TestBorderCross(newpos, Cardinals.S)
-                    || ParentGroup.Scene.TestBorderCross(newpos, Cardinals.E)
-                    || ParentGroup.Scene.TestBorderCross(newpos, Cardinals.W))
+                if (!ParentGroup.Scene.PositionIsInCurrentRegion(newpos))
                 {
                     ParentGroup.AbsolutePosition = newpos;
                     return;
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index dff582b..3e278a9 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -842,9 +842,8 @@ namespace OpenSim.Region.Framework.Scenes
             foreach (ulong handle in seeds.Keys)
             {
                 uint x, y;
-                Utils.LongToUInts(handle, out x, out y);
-                x = x / Constants.RegionSize;
-                y = y / Constants.RegionSize;
+                Util.RegionHandleToRegionLoc(handle, out x, out y);
+
                 if (Util.IsOutsideView(DrawDistance, x, Scene.RegionInfo.RegionLocX, y, Scene.RegionInfo.RegionLocY))
                 {
                     old.Add(handle);
@@ -866,9 +865,7 @@ namespace OpenSim.Region.Framework.Scenes
             foreach (KeyValuePair<ulong, string> kvp in KnownRegions)
             {
                 uint x, y;
-                Utils.LongToUInts(kvp.Key, out x, out y);
-                x = x / Constants.RegionSize;
-                y = y / Constants.RegionSize;
+                Util.RegionHandleToRegionLoc(kvp.Key, out x, out y);
                 m_log.Info(" >> "+x+", "+y+": "+kvp.Value);
             }
         }
@@ -1170,18 +1167,6 @@ namespace OpenSim.Region.Framework.Scenes
 
             if (ParentID == 0)
             {
-                if (m_scene.TestBorderCross(pos, Cardinals.E))
-                {
-                    Border crossedBorder = m_scene.GetCrossedBorder(pos, Cardinals.E);
-                    pos.X = crossedBorder.BorderLine.Z - 1;
-                }
-
-                if (m_scene.TestBorderCross(pos, Cardinals.N))
-                {
-                    Border crossedBorder = m_scene.GetCrossedBorder(pos, Cardinals.N);
-                    pos.Y = crossedBorder.BorderLine.Z - 1;
-                }
-
                 CheckAndAdjustLandingPoint(ref pos);
 
                 if (pos.X < 0f || pos.Y < 0f || pos.Z < 0f)
@@ -1201,7 +1186,7 @@ namespace OpenSim.Region.Framework.Scenes
 
                 float posZLimit = 0;
 
-                if (pos.X < Constants.RegionSize && pos.Y < Constants.RegionSize)
+                if (pos.X < m_scene.RegionInfo.RegionSizeX && pos.Y < m_scene.RegionInfo.RegionSizeY)
                     posZLimit = (float)m_scene.Heightmap[(int)pos.X, (int)pos.Y];
 
                 float newPosZ = posZLimit + localAVHeight / 2;
@@ -2612,7 +2597,7 @@ namespace OpenSim.Region.Framework.Scenes
             if (regionCombinerModule != null)
                 regionSize = regionCombinerModule.GetSizeOfMegaregion(m_scene.RegionInfo.RegionID);
             else
-                regionSize = new Vector2(Constants.RegionSize);
+                regionSize = new Vector2(m_scene.RegionInfo.RegionSizeX, m_scene.RegionInfo.RegionSizeY);
 
             if (pos.X < 0 || pos.X >= regionSize.X
                 || pos.Y < 0 || pos.Y >= regionSize.Y
@@ -2630,8 +2615,8 @@ namespace OpenSim.Region.Framework.Scenes
 //            }
 
             // Get terrain height for sub-region in a megaregion if necessary
-            int X = (int)((m_scene.RegionInfo.RegionLocX * Constants.RegionSize) + pos.X);
-            int Y = (int)((m_scene.RegionInfo.RegionLocY * Constants.RegionSize) + pos.Y);
+            int X = (int)((m_scene.RegionInfo.WorldLocX) + pos.X);
+            int Y = (int)((m_scene.RegionInfo.WorldLocY) + pos.Y);
             GridRegion target_region = m_scene.GridService.GetRegionByPosition(m_scene.RegionInfo.ScopeID, X, Y);
             // If X and Y is NaN, target_region will be null
             if (target_region == null)
@@ -2642,7 +2627,7 @@ namespace OpenSim.Region.Framework.Scenes
             if (!SceneManager.Instance.TryGetScene(target_regionID, out targetScene))
                 targetScene = m_scene;
 
-            float terrainHeight = (float)targetScene.Heightmap[(int)(pos.X % Constants.RegionSize), (int)(pos.Y % Constants.RegionSize)];
+            float terrainHeight = (float)targetScene.Heightmap[(int)(pos.X % regionSize.X), (int)(pos.Y % regionSize.Y)];
             // dont try to land underground
             terrainHeight += Appearance.AvatarHeight / 2;
             pos.Z = Math.Max(terrainHeight, pos.Z);
@@ -3872,32 +3857,28 @@ namespace OpenSim.Region.Framework.Scenes
 //                    m_log.DebugFormat(
 //                        "[SCENE PRESENCE]: Testing border check for projected position {0} of {1} in {2}", 
 //                        pos2, Name, Scene.Name);
-            
-            if( Scene.TestBorderCross(pos2, Cardinals.E) ||
-                Scene.TestBorderCross(pos2, Cardinals.W) ||
-                Scene.TestBorderCross(pos2, Cardinals.N) ||
-                Scene.TestBorderCross(pos2, Cardinals.S)
-               )
+
+            if (Scene.PositionIsInCurrentRegion(pos2))
+                return;
+
+            if (!CrossToNewRegion() && m_requestedSitTargetUUID == UUID.Zero)
             {
-                if (!CrossToNewRegion() && m_requestedSitTargetUUID == UUID.Zero)
-                {
-                    // we don't have entity transfer module
-                    Vector3 pos = AbsolutePosition;
-                    float px = pos.X;
-                    if (px < 0)
-                        pos.X += Velocity.X * 2;
-                    else if (px > m_scene.RegionInfo.RegionSizeX)
-                        pos.X -= Velocity.X * 2;
+                // we don't have entity transfer module
+                Vector3 pos = AbsolutePosition;
+                float px = pos.X;
+                if (px < 0)
+                    pos.X += Velocity.X * 2;
+                else if (px > m_scene.RegionInfo.RegionSizeX)
+                    pos.X -= Velocity.X * 2;
 
-                    float py = pos.Y;
-                    if (py < 0)
-                        pos.Y += Velocity.Y * 2;
-                    else if (py > m_scene.RegionInfo.RegionSizeY)
-                        pos.Y -= Velocity.Y * 2;
+                float py = pos.Y;
+                if (py < 0)
+                    pos.Y += Velocity.Y * 2;
+                else if (py > m_scene.RegionInfo.RegionSizeY)
+                    pos.Y -= Velocity.Y * 2;
 
-                    Velocity = Vector3.Zero;
-                    AbsolutePosition = pos;
-                }
+                Velocity = Vector3.Zero;
+                AbsolutePosition = pos;
             }
         }
 
@@ -3962,7 +3943,7 @@ namespace OpenSim.Region.Framework.Scenes
 
             // Put the child agent back at the center
             AbsolutePosition 
-                = new Vector3(((float)Constants.RegionSize * 0.5f), ((float)Constants.RegionSize * 0.5f), 70);
+                = new Vector3(((float)m_scene.RegionInfo.RegionSizeX * 0.5f), ((float)m_scene.RegionInfo.RegionSizeY * 0.5f), 70);
 
             Animator.ResetAnimations();
         }
@@ -3989,9 +3970,7 @@ namespace OpenSim.Region.Framework.Scenes
                 if (handle != Scene.RegionInfo.RegionHandle)
                 {
                     uint x, y;
-                    Utils.LongToUInts(handle, out x, out y);
-                    x = x / Constants.RegionSize;
-                    y = y / Constants.RegionSize;
+                    Util.RegionHandleToRegionLoc(handle, out x, out y);
 
 //                    m_log.Debug("---> x: " + x + "; newx:" + newRegionX + "; Abs:" + (int)Math.Abs((int)(x - newRegionX)));
 //                    m_log.Debug("---> y: " + y + "; newy:" + newRegionY + "; Abs:" + (int)Math.Abs((int)(y - newRegionY)));
diff --git a/OpenSim/Region/Framework/Scenes/TerrainChannel.cs b/OpenSim/Region/Framework/Scenes/TerrainChannel.cs
index b6e0a97..3d563a6 100644
--- a/OpenSim/Region/Framework/Scenes/TerrainChannel.cs
+++ b/OpenSim/Region/Framework/Scenes/TerrainChannel.cs
@@ -25,14 +25,21 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-using OpenSim.Framework;
-using OpenSim.Region.Framework.Interfaces;
 using System;
+using System.IO;
 using System.Text;
+using System.Reflection;
 using System.Xml;
-using System.IO;
 using System.Xml.Serialization;
 
+using OpenSim.Data;
+using OpenSim.Framework;
+using OpenSim.Region.Framework.Interfaces;
+
+using OpenMetaverse;
+
+using log4net;
+
 namespace OpenSim.Region.Framework.Scenes
 {
     /// <summary>
@@ -40,140 +47,136 @@ namespace OpenSim.Region.Framework.Scenes
     /// </summary>
     public class TerrainChannel : ITerrainChannel
     {
-        private readonly bool[,] taint;
-        private double[,] map;
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static string LogHeader = "[TERRAIN CHANNEL]";
 
+        protected TerrainData m_terrainData;
+
+        public int Width { get { return m_terrainData.SizeX; } }  // X dimension
+        // Unfortunately, for historical reasons, in this module 'Width' is X and 'Height' is Y
+        public int Height { get { return m_terrainData.SizeY; } } // Y dimension
+        public int Altitude { get { return m_terrainData.SizeZ; } } // Y dimension
+
+        // Default, not-often-used builder
         public TerrainChannel()
         {
-            map = new double[Constants.RegionSize, Constants.RegionSize];
-            taint = new bool[Constants.RegionSize / 16, Constants.RegionSize / 16];
-
-            PinHeadIsland();
+            m_terrainData = new HeightmapTerrainData((int)Constants.RegionSize, (int)Constants.RegionSize, (int)Constants.RegionHeight);
+            FlatLand();
+            // PinHeadIsland();
         }
 
-        public TerrainChannel(String type)
+        // Create terrain of given size
+        public TerrainChannel(int pX, int pY)
         {
-            map = new double[Constants.RegionSize, Constants.RegionSize];
-            taint = new bool[Constants.RegionSize / 16, Constants.RegionSize / 16];
+            m_terrainData = new HeightmapTerrainData(pX, pY, (int)Constants.RegionHeight);
+        }
 
+        // Create terrain of specified size and initialize with specified terrain.
+        // TODO: join this with the terrain initializers.
+        public TerrainChannel(String type, int pX, int pY, int pZ)
+        {
+            m_terrainData = new HeightmapTerrainData(pX, pY, pZ);
             if (type.Equals("flat"))
                 FlatLand();
             else
                 PinHeadIsland();
         }
 
-        public TerrainChannel(double[,] import)
+        // Create channel passed a heightmap and expected dimensions of the region.
+        // The heightmap might not fit the passed size so accomodations must be made.
+        public TerrainChannel(double[,] pM, int pSizeX, int pSizeY, int pAltitude)
         {
-            map = import;
-            taint = new bool[import.GetLength(0),import.GetLength(1)];
-        }
+            int hmSizeX = pM.GetLength(0);
+            int hmSizeY = pM.GetLength(1);
 
-        public TerrainChannel(bool createMap)
-        {
-            if (createMap)
-            {
-                map = new double[Constants.RegionSize,Constants.RegionSize];
-                taint = new bool[Constants.RegionSize / 16,Constants.RegionSize / 16];
-            }
+            m_terrainData = new HeightmapTerrainData(pSizeX, pSizeY, pAltitude);
+
+            for (int xx = 0; xx < pSizeX; xx++)
+                for (int yy = 0; yy < pSizeY; yy++)
+                    if (xx > hmSizeX || yy > hmSizeY)
+                        m_terrainData[xx, yy] = TerrainData.DefaultTerrainHeight;
+                    else
+                        m_terrainData[xx, yy] = (float)pM[xx, yy];
         }
 
-        public TerrainChannel(int w, int h)
+        public TerrainChannel(TerrainData pTerrData)
         {
-            map = new double[w,h];
-            taint = new bool[w / 16,h / 16];
+            m_terrainData = pTerrData;
         }
 
         #region ITerrainChannel Members
 
-        public int Width
+        // ITerrainChannel.MakeCopy()
+        public ITerrainChannel MakeCopy()
         {
-            get { return map.GetLength(0); }
+            return this.Copy();
         }
 
-        public int Height
+        // ITerrainChannel.GetTerrainData()
+        public TerrainData GetTerrainData()
         {
-            get { return map.GetLength(1); }
+            return m_terrainData;
         }
 
-        public ITerrainChannel MakeCopy()
+        // ITerrainChannel.GetFloatsSerialized()
+        // This one dimensional version is ordered so height = map[y*sizeX+x];
+        // DEPRECATED: don't use this function as it does not retain the dimensions of the terrain
+        //     and the caller will probably do the wrong thing if the terrain is not the legacy 256x256.
+        public float[] GetFloatsSerialised()
         {
-            TerrainChannel copy = new TerrainChannel(false);
-            copy.map = (double[,]) map.Clone();
-
-            return copy;
+            return m_terrainData.GetFloatsSerialized();
         }
 
-        public float[] GetFloatsSerialised()
+        // ITerrainChannel.GetDoubles()
+        public double[,] GetDoubles()
         {
-            // Move the member variables into local variables, calling
-            // member variables 256*256 times gets expensive
-            int w = Width;
-            int h = Height;
-            float[] heights = new float[w * h];
+            double[,] heights = new double[Width, Height];
 
-            int i, j; // map coordinates
             int idx = 0; // index into serialized array
-            for (i = 0; i < h; i++)
+            for (int ii = 0; ii < Width; ii++)
             {
-                for (j = 0; j < w; j++)
+                for (int jj = 0; jj < Height; jj++)
                 {
-                    heights[idx++] = (float)map[j, i];
+                    heights[ii, jj] = (double)m_terrainData[ii, jj];
+                    idx++;
                 }
             }
 
             return heights;
         }
 
-        public double[,] GetDoubles()
-        {
-            return map;
-        }
-
+        // ITerrainChannel.this[x,y]
         public double this[int x, int y]
         {
-            get
-            {
-                if (x < 0) x = 0;
-                if (y < 0) y = 0;
-                if (x >= (int)Constants.RegionSize) x = (int)Constants.RegionSize - 1;
-                if (y >= (int)Constants.RegionSize) y = (int)Constants.RegionSize - 1;
-
-                return map[x, y];
+            get {
+                if (x < 0 || x >= Width || y < 0 || y >= Height)
+                    return 0;
+                return (double)m_terrainData[x, y];
             }
             set
             {
-                // Will "fix" terrain hole problems. Although not fantastically.
                 if (Double.IsNaN(value) || Double.IsInfinity(value))
                     return;
 
-                if (map[x, y] != value)
-                {
-                    taint[x / 16, y / 16] = true;
-                    map[x, y] = value;
-                }
+                m_terrainData[x, y] = (float)value;
             }
         }
 
-        public bool Tainted(int x, int y)
+        // ITerrainChannel.GetHieghtAtXYZ(x, y, z)
+        public float GetHeightAtXYZ(float x, float y, float z)
         {
-            if (taint[x / 16, y / 16])
-            {
-                taint[x / 16, y / 16] = false;
-                return true;
-            }
-            return false;
+            if (x < 0 || x >= Width || y < 0 || y >= Height)
+                return 0;
+            return m_terrainData[(int)x, (int)y];
         }
 
-        #endregion
-
-        public TerrainChannel Copy()
+        // ITerrainChannel.Tainted()
+        public bool Tainted(int x, int y)
         {
-            TerrainChannel copy = new TerrainChannel(false);
-            copy.map = (double[,]) map.Clone();
-
-            return copy;
+            return m_terrainData.IsTaintedAt(x, y);
         }
 
+        // ITerrainChannel.SaveToXmlString()
         public string SaveToXmlString()
         {
             XmlWriterSettings settings = new XmlWriterSettings();
@@ -189,13 +192,7 @@ namespace OpenSim.Region.Framework.Scenes
             }
         }
 
-        private void WriteXml(XmlWriter writer)
-        {
-            writer.WriteStartElement(String.Empty, "TerrainMap", String.Empty);
-            ToXml(writer);
-            writer.WriteEndElement();
-        }
-
+        // ITerrainChannel.LoadFromXmlString()
         public void LoadFromXmlString(string data)
         {
             StringReader sr = new StringReader(data);
@@ -207,12 +204,124 @@ namespace OpenSim.Region.Framework.Scenes
             sr.Close();
         }
 
+        // ITerrainChannel.Merge
+        public void Merge(ITerrainChannel newTerrain, Vector3 displacement, float radianRotation, Vector2 rotationDisplacement)
+        {
+            m_log.DebugFormat("{0} Merge. inSize=<{1},{2}>, disp={3}, rot={4}, rotDisp={5}, outSize=<{6},{7}>", LogHeader,
+                                        newTerrain.Width, newTerrain.Height,
+                                        displacement, radianRotation, rotationDisplacement,
+                                        m_terrainData.SizeX, m_terrainData.SizeY);
+            for (int xx = 0; xx < newTerrain.Width; xx++)
+            {
+                for (int yy = 0; yy < newTerrain.Height; yy++)
+                {
+                    int dispX = (int)displacement.X;
+                    int dispY = (int)displacement.Y;
+                    float newHeight = (float)newTerrain[xx, yy] + displacement.Z;
+                    if (radianRotation == 0)
+                    {
+                        // If no rotation, place the new height in the specified location
+                        dispX += xx;
+                        dispY += yy;
+                        if (dispX >= 0 && dispX < m_terrainData.SizeX && dispY >= 0 && dispY < m_terrainData.SizeY)
+                        {
+                            m_terrainData[dispX, dispY] = newHeight;
+                        }
+                    }
+                    else
+                    {
+                        // If rotating, we have to smooth the result because the conversion
+                        //    to ints will mean heightmap entries will not get changed
+                        // First compute the rotation location for the new height.
+                        dispX += (int)(rotationDisplacement.X
+                            + ((float)xx - rotationDisplacement.X) * Math.Cos(radianRotation)
+                            - ((float)yy - rotationDisplacement.Y) * Math.Sin(radianRotation) );
+
+                        dispY += (int)(rotationDisplacement.Y
+                            + ((float)xx - rotationDisplacement.X) * Math.Sin(radianRotation)
+                            + ((float)yy - rotationDisplacement.Y) * Math.Cos(radianRotation) );
+
+                        if (dispX >= 0 && dispX < m_terrainData.SizeX && dispY >= 0 && dispY < m_terrainData.SizeY)
+                        {
+                            float oldHeight = m_terrainData[dispX, dispY];
+                            // Smooth the heights around this location if the old height is far from this one
+                            for (int sxx = dispX - 2; sxx < dispX + 2; sxx++)
+                            {
+                                for (int syy = dispY - 2; syy < dispY + 2; syy++)
+                                {
+                                    if (sxx >= 0 && sxx < m_terrainData.SizeX && syy >= 0 && syy < m_terrainData.SizeY)
+                                    {
+                                        if (sxx == dispX && syy == dispY)
+                                        {
+                                            // Set height for the exact rotated point
+                                            m_terrainData[dispX, dispY] = newHeight;
+                                        }
+                                        else
+                                        {
+                                            if (Math.Abs(m_terrainData[sxx, syy] - newHeight) > 1f)
+                                            {
+                                                // If the adjacent height is far off, force it to this height
+                                                m_terrainData[sxx, syy] = newHeight;
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+
+                        if (dispX >= 0 && dispX < m_terrainData.SizeX && dispY >= 0 && dispY < m_terrainData.SizeY)
+                        {
+                            m_terrainData[dispX, dispY] = (float)newTerrain[xx, yy];
+                        }
+                    }
+                }
+            }
+        }
+
+        #endregion
+
+        public TerrainChannel Copy()
+        {
+            TerrainChannel copy = new TerrainChannel();
+            copy.m_terrainData = m_terrainData.Clone();
+            return copy;
+        }
+
+        private void WriteXml(XmlWriter writer)
+        {
+            if (Width == Constants.RegionSize && Height == Constants.RegionSize)
+            {
+                // Downward compatibility for legacy region terrain maps.
+                // If region is exactly legacy size, return the old format XML.
+                writer.WriteStartElement(String.Empty, "TerrainMap", String.Empty);
+                ToXml(writer);
+                writer.WriteEndElement();
+            }
+            else
+            {
+                // New format XML that includes width and length.
+                writer.WriteStartElement(String.Empty, "TerrainMap2", String.Empty);
+                ToXml2(writer);
+                writer.WriteEndElement();
+            }
+        }
+
         private void ReadXml(XmlReader reader)
         {
-            reader.ReadStartElement("TerrainMap");
-            FromXml(reader);
+            // Check the first element. If legacy element, use the legacy reader.
+            if (reader.IsStartElement("TerrainMap"))
+            {
+                reader.ReadStartElement("TerrainMap");
+                FromXml(reader);
+            }
+            else
+            {
+                reader.ReadStartElement("TerrainMap2");
+                FromXml2(reader);
+            }
         }
 
+        // Write legacy terrain map. Presumed to be 256x256 of data encoded as floats in a byte array.
         private void ToXml(XmlWriter xmlWriter)
         {
             float[] mapData = GetFloatsSerialised();
@@ -226,12 +335,15 @@ namespace OpenSim.Region.Framework.Scenes
             serializer.Serialize(xmlWriter, buffer);
         }
 
+        // Read legacy terrain map. Presumed to be 256x256 of data encoded as floats in a byte array.
         private void FromXml(XmlReader xmlReader)
         {
             XmlSerializer serializer = new XmlSerializer(typeof(byte[]));
             byte[] dataArray = (byte[])serializer.Deserialize(xmlReader);
             int index = 0;
 
+            m_terrainData = new HeightmapTerrainData(Height, Width, (int)Constants.RegionHeight);
+            
             for (int y = 0; y < Height; y++)
             {
                 for (int x = 0; x < Width; x++)
@@ -244,35 +356,63 @@ namespace OpenSim.Region.Framework.Scenes
             }
         }
 
+        private class TerrainChannelXMLPackage
+        {
+            public int Version;
+            public int SizeX;
+            public int SizeY;
+            public int SizeZ;
+            public float CompressionFactor;
+            public int[] Map;
+            public TerrainChannelXMLPackage(int pX, int pY, int pZ, float pCompressionFactor, int[] pMap)
+            {
+                Version = 1;
+                SizeX = pX;
+                SizeY = pY;
+                SizeZ = pZ;
+                CompressionFactor = pCompressionFactor;
+                Map = pMap;
+            }
+        }
+
+        // New terrain serialization format that includes the width and length.
+        private void ToXml2(XmlWriter xmlWriter)
+        {
+            TerrainChannelXMLPackage package = new TerrainChannelXMLPackage(Width, Height, Altitude, m_terrainData.CompressionFactor,
+                                            m_terrainData.GetCompressedMap());
+            XmlSerializer serializer = new XmlSerializer(typeof(TerrainChannelXMLPackage));
+            serializer.Serialize(xmlWriter, package);
+        }
+
+        // New terrain serialization format that includes the width and length.
+        private void FromXml2(XmlReader xmlReader)
+        {
+            XmlSerializer serializer = new XmlSerializer(typeof(TerrainChannelXMLPackage));
+            TerrainChannelXMLPackage package = (TerrainChannelXMLPackage)serializer.Deserialize(xmlReader);
+            m_terrainData = new HeightmapTerrainData(package.Map, package.CompressionFactor, package.SizeX, package.SizeY, package.SizeZ);
+        }
+
+        // Fill the heightmap with the center bump terrain
         private void PinHeadIsland()
         {
-            int x;
-            for (x = 0; x < Constants.RegionSize; x++)
+            for (int x = 0; x < Width; x++)
             {
-                int y;
-                for (y = 0; y < Constants.RegionSize; y++)
+                for (int y = 0; y < Height; y++)
                 {
-                    map[x, y] = TerrainUtil.PerlinNoise2D(x, y, 2, 0.125) * 10;
-                    double spherFacA = TerrainUtil.SphericalFactor(x, y, Constants.RegionSize / 2.0, Constants.RegionSize / 2.0, 50) * 0.01;
-                    double spherFacB = TerrainUtil.SphericalFactor(x, y, Constants.RegionSize / 2.0, Constants.RegionSize / 2.0, 100) * 0.001;
-                    if (map[x, y] < spherFacA)
-                        map[x, y] = spherFacA;
-                    if (map[x, y] < spherFacB)
-                        map[x, y] = spherFacB;
+                    m_terrainData[x, y] = (float)TerrainUtil.PerlinNoise2D(x, y, 2, 0.125) * 10;
+                    float spherFacA = (float)(TerrainUtil.SphericalFactor(x, y, m_terrainData.SizeX / 2.0, m_terrainData.SizeY / 2.0, 50) * 0.01d);
+                    float spherFacB = (float)(TerrainUtil.SphericalFactor(x, y, m_terrainData.SizeX / 2.0, m_terrainData.SizeY / 2.0, 100) * 0.001d);
+                    if (m_terrainData[x, y]< spherFacA)
+                        m_terrainData[x, y]= spherFacA;
+                    if (m_terrainData[x, y]< spherFacB)
+                        m_terrainData[x, y] = spherFacB;
                 }
             }
         }
 
         private void FlatLand()
         {
-            int x;
-            for (x = 0; x < Constants.RegionSize; x++)
-            {
-                int y;
-                for (y = 0; y < Constants.RegionSize; y++)
-                    map[x, y] = 21;
-            }
+            m_terrainData.ClearLand();
         }
-
     }
 }
diff --git a/OpenSim/Region/Framework/Scenes/TerrainCompressor.cs b/OpenSim/Region/Framework/Scenes/TerrainCompressor.cs
new file mode 100644
index 0000000..fc8f8cd
--- /dev/null
+++ b/OpenSim/Region/Framework/Scenes/TerrainCompressor.cs
@@ -0,0 +1,948 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* Freely adapted from the Aurora version of the terrain compressor.
+ * Copyright (c) Contributors, http://aurora-sim.org/, http://opensimulator.org/
+ */
+
+using System;
+using System.Reflection;
+
+using log4net;
+
+using OpenSim.Framework;
+using OpenSim.Region.Framework;
+using OpenSim.Region.Framework.Scenes;
+
+using OpenMetaverse;
+using OpenMetaverse.Packets;
+
+namespace OpenSim.Region.ClientStack.LindenUDP
+{
+    public static class OpenSimTerrainCompressor
+    {
+//        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+#pragma warning disable 414
+        private static string LogHeader = "[TERRAIN COMPRESSOR]";
+#pragma warning restore 414
+
+        public const int END_OF_PATCHES = 97;
+
+        private const float OO_SQRT2 = 0.7071067811865475244008443621049f;
+        private const int STRIDE = 264;
+
+        private const int ZERO_CODE = 0x0;
+        private const int ZERO_EOB = 0x2;
+        private const int POSITIVE_VALUE = 0x6;
+        private const int NEGATIVE_VALUE = 0x7;
+
+        private static readonly float[] DequantizeTable16 =
+            new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+
+        private static readonly float[] DequantizeTable32 =
+            new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+
+        private static readonly float[] CosineTable16 = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+        //private static readonly float[] CosineTable32 = new float[Constants.TerrainPatchSize * Constants.TerrainPatchSize];
+        private static readonly int[] CopyMatrix16 = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+        private static readonly int[] CopyMatrix32 = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+
+        private static readonly float[] QuantizeTable16 =
+            new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+
+        static OpenSimTerrainCompressor()
+        {
+            // Initialize the decompression tables
+            BuildDequantizeTable16();
+            SetupCosines16();
+            BuildCopyMatrix16();
+            BuildQuantizeTable16();
+        }
+
+        // Used to send cloud and wind patches
+        public static LayerDataPacket CreateLayerDataPacket(TerrainPatch[] patches, byte type, int pRegionSizeX,
+                                                            int pRegionSizeY)
+        {
+            LayerDataPacket layer = new LayerDataPacket {LayerID = {Type = type}};
+
+            TerrainPatch.GroupHeader header = new TerrainPatch.GroupHeader
+                                                  {Stride = STRIDE, PatchSize = Constants.TerrainPatchSize};
+
+            // Should be enough to fit even the most poorly packed data
+            byte[] data = new byte[patches.Length*Constants.TerrainPatchSize*Constants.TerrainPatchSize*2];
+            BitPack bitpack = new BitPack(data, 0);
+            bitpack.PackBits(header.Stride, 16);
+            bitpack.PackBits(header.PatchSize, 8);
+            bitpack.PackBits(type, 8);
+
+            foreach (TerrainPatch t in patches)
+                CreatePatch(bitpack, t.Data, t.X, t.Y, pRegionSizeX, pRegionSizeY);
+
+            bitpack.PackBits(END_OF_PATCHES, 8);
+
+            layer.LayerData.Data = new byte[bitpack.BytePos + 1];
+            Buffer.BlockCopy(bitpack.Data, 0, layer.LayerData.Data, 0, bitpack.BytePos + 1);
+
+            return layer;
+        }
+
+        // Create a land packet for a single patch.
+        public static LayerDataPacket CreateLandPacket(TerrainData terrData, int patchX, int patchY)
+        {
+            int[] xPieces = new int[1];
+            int[] yPieces = new int[1];
+            xPieces[0] = patchX;  // patch X dimension
+            yPieces[0] = patchY;
+
+            return CreateLandPacket(terrData, xPieces, yPieces);
+        }
+
+        public static LayerDataPacket CreateLandPacket(TerrainData terrData, int[] xPieces, int[] yPieces)
+        {
+            byte landPacketType = (byte)TerrainPatch.LayerType.Land;
+            if (terrData.SizeX > Constants.RegionSize || terrData.SizeY > Constants.RegionSize)
+            {
+                landPacketType = (byte)TerrainPatch.LayerType.LandExtended;
+            }
+
+            return CreateLandPacket(terrData, xPieces, yPieces, landPacketType);
+        }
+
+        /// <summary>
+        ///     Creates a LayerData packet for compressed land data given a full
+        ///     simulator heightmap and an array of indices of patches to compress
+        /// </summary>
+        /// <param name="terrData">
+        ///     Terrain data that can result in a meter square heightmap.
+        /// </param>
+        /// <param name="x">
+        ///     Array of indexes in the grid of patches
+        ///     for this simulator.
+        ///     If creating a packet for multiple patches, there will be entries in
+        ///     both the X and Y arrays for each of the patches.
+        ///     For example if patches 1 and 17 are to be sent,
+        ///     x[] = {1,1} and y[] = {0,1} which specifies the patches at
+        ///     indexes <1,0> and <1,1> (presuming the terrain size is 16x16 patches).
+        /// </param>
+        /// <param name="y">
+        ///     Array of indexes in the grid of patches.
+        /// </param>
+        /// <param name="type"></param>
+        /// <returns></returns>
+        public static LayerDataPacket CreateLandPacket(TerrainData terrData, int[] x, int[] y, byte type)
+        {
+            LayerDataPacket layer = new LayerDataPacket {LayerID = {Type = type}};
+
+            TerrainPatch.GroupHeader header = new TerrainPatch.GroupHeader
+                                                  {Stride = STRIDE, PatchSize = Constants.TerrainPatchSize};
+
+            byte[] data = new byte[x.Length * Constants.TerrainPatchSize * Constants.TerrainPatchSize * 2];
+            BitPack bitpack = new BitPack(data, 0);
+            bitpack.PackBits(header.Stride, 16);
+            bitpack.PackBits(header.PatchSize, 8);
+            bitpack.PackBits(type, 8);
+
+            for (int i = 0; i < x.Length; i++)
+                CreatePatchFromHeightmap(bitpack, terrData, x[i], y[i]);
+
+            bitpack.PackBits(END_OF_PATCHES, 8);
+
+            layer.LayerData.Data = new byte[bitpack.BytePos + 1];
+            Buffer.BlockCopy(bitpack.Data, 0, layer.LayerData.Data, 0, bitpack.BytePos + 1);
+
+            return layer;
+        }
+
+        // Unused: left for historical reference.
+        public static void CreatePatch(BitPack output, float[] patchData, int x, int y, int pRegionSizeX, int pRegionSizeY)
+        {
+            TerrainPatch.Header header = PrescanPatch(patchData);
+            header.QuantWBits = 136;
+            if (pRegionSizeX > Constants.RegionSize || pRegionSizeY > Constants.RegionSize)
+            {
+                header.PatchIDs = (y & 0xFFFF);
+                header.PatchIDs += (x << 16);
+            }
+            else
+            {
+                header.PatchIDs = (y & 0x1F);
+                header.PatchIDs += (x << 5);
+            }
+
+            // NOTE: No idea what prequant and postquant should be or what they do
+
+            int wbits;
+            int[] patch = CompressPatch(patchData, header, 10, out wbits);
+            wbits = EncodePatchHeader(output, header, patch, Constants.RegionSize, Constants.RegionSize, wbits);
+            EncodePatch(output, patch, 0, wbits);
+        }
+
+        /// <summary>
+        ///     Add a patch of terrain to a BitPacker
+        /// </summary>
+        /// <param name="output">BitPacker to write the patch to</param>
+        /// <param name="heightmap">
+        ///     Heightmap of the simulator. Presumed to be an sizeX*sizeY array.
+        /// </param>
+        /// <param name="patchX">
+        ///     X offset of the patch to create.
+        /// </param>
+        /// <param name="patchY">
+        ///     Y offset of the patch to create.
+        /// </param>
+        /// <param name="pRegionSizeX"></param>
+        /// <param name="pRegionSizeY"></param>
+        public static void CreatePatchFromHeightmap(BitPack output, TerrainData terrData, int patchX, int patchY)
+        {
+            TerrainPatch.Header header = PrescanPatch(terrData, patchX, patchY);
+            header.QuantWBits = 136;
+
+            // If larger than legacy region size, pack patch X and Y info differently.
+            if (terrData.SizeX > Constants.RegionSize || terrData.SizeY > Constants.RegionSize)
+            {
+                header.PatchIDs = (patchY & 0xFFFF);
+                header.PatchIDs += (patchX << 16);
+            }
+            else
+            {
+                header.PatchIDs = (patchY & 0x1F);
+                header.PatchIDs += (patchX << 5);
+            }
+
+            // m_log.DebugFormat("{0} CreatePatchFromHeightmap. patchX={1}, patchY={2}, DCOffset={3}, range={4}",
+            //                         LogHeader, patchX, patchY, header.DCOffset, header.Range);
+
+            // NOTE: No idea what prequant and postquant should be or what they do
+            int wbits;
+            int[] patch = CompressPatch(terrData, patchX, patchY, header, 10, out wbits);
+            wbits = EncodePatchHeader(output, header, patch, (uint)terrData.SizeX, (uint)terrData.SizeY, wbits);
+            EncodePatch(output, patch, 0, wbits);
+        }
+
+        private static TerrainPatch.Header PrescanPatch(float[] patch)
+        {
+            TerrainPatch.Header header = new TerrainPatch.Header();
+            float zmax = -99999999.0f;
+            float zmin = 99999999.0f;
+
+            for (int i = 0; i < Constants.TerrainPatchSize*Constants.TerrainPatchSize; i++)
+            {
+                float val = patch[i];
+                if (val > zmax) zmax = val;
+                if (val < zmin) zmin = val;
+            }
+
+            header.DCOffset = zmin;
+            header.Range = (int) ((zmax - zmin) + 1.0f);
+
+            return header;
+        }
+
+        // Scan the height info we're returning and return a patch packet header for this patch.
+        private static TerrainPatch.Header PrescanPatch(TerrainData terrData, int patchX, int patchY)
+        {
+            TerrainPatch.Header header = new TerrainPatch.Header();
+            float zmax = -99999999.0f;
+            float zmin = 99999999.0f;
+
+            for (int j = patchY*Constants.TerrainPatchSize; j < (patchY + 1)*Constants.TerrainPatchSize; j++)
+            {
+                for (int i = patchX*Constants.TerrainPatchSize; i < (patchX + 1)*Constants.TerrainPatchSize; i++)
+                {
+                    float val = terrData[i, j];
+                    if (val > zmax) zmax = val;
+                    if (val < zmin) zmin = val;
+                }
+            }
+
+            header.DCOffset = zmin;
+            header.Range = (int)((zmax - zmin) + 1.0f);
+
+            return header;
+        }
+
+        public static TerrainPatch.Header DecodePatchHeader(BitPack bitpack)
+        {
+            TerrainPatch.Header header = new TerrainPatch.Header {QuantWBits = bitpack.UnpackBits(8)};
+
+            // Quantized word bits
+            if (header.QuantWBits == END_OF_PATCHES)
+                return header;
+
+            // DC offset
+            header.DCOffset = bitpack.UnpackFloat();
+
+            // Range
+            header.Range = bitpack.UnpackBits(16);
+
+            // Patch IDs (10 bits)
+            header.PatchIDs = bitpack.UnpackBits(10);
+
+            // Word bits
+            header.WordBits = (uint) ((header.QuantWBits & 0x0f) + 2);
+
+            return header;
+        }
+
+        private static int EncodePatchHeader(BitPack output, TerrainPatch.Header header, int[] patch, uint pRegionSizeX,
+                                             uint pRegionSizeY, int wbits)
+        {
+            /*
+                    int temp;
+                    int wbits = (header.QuantWBits & 0x0f) + 2;
+                    uint maxWbits = (uint)wbits + 5;
+                    uint minWbits = ((uint)wbits >> 1);
+                    int wbitsMaxValue;
+        */
+            // goal is to determ minimum number of bits to use so all data fits
+            /*
+                    wbits = (int)minWbits;
+                    wbitsMaxValue = (1 << wbits);
+
+                    for (int i = 0; i < patch.Length; i++)
+                    {
+                        temp = patch[i];
+                        if (temp != 0)
+                        {
+                            // Get the absolute value
+                            if (temp < 0) temp *= -1;
+
+         no coments..
+
+                            for (int j = (int)maxWbits; j > (int)minWbits; j--)
+                            {
+                                if ((temp & (1 << j)) != 0)
+                                {
+                                    if (j > wbits) wbits = j;
+                                    break;
+                                }
+                            }
+ 
+                            while (temp > wbitsMaxValue)
+                                {
+                                wbits++;
+                                if (wbits == maxWbits)
+                                    goto Done;
+                                wbitsMaxValue = 1 << wbits;
+                                }
+                        }
+                    }
+
+                Done:
+
+                    //            wbits += 1;
+         */
+            // better check
+            if (wbits > 17)
+                wbits = 16;
+            else if (wbits < 3)
+                wbits = 3;
+
+            header.QuantWBits &= 0xf0;
+
+            header.QuantWBits |= (wbits - 2);
+
+            output.PackBits(header.QuantWBits, 8);
+            output.PackFloat(header.DCOffset);
+            output.PackBits(header.Range, 16);
+            if (pRegionSizeX > Constants.RegionSize || pRegionSizeY > Constants.RegionSize)
+                output.PackBits(header.PatchIDs, 32);
+            else
+                output.PackBits(header.PatchIDs, 10);
+
+            return wbits;
+        }
+
+        private static void IDCTColumn16(float[] linein, float[] lineout, int column)
+        {
+            for (int n = 0; n < Constants.TerrainPatchSize; n++)
+            {
+                float total = OO_SQRT2*linein[column];
+
+                for (int u = 1; u < Constants.TerrainPatchSize; u++)
+                {
+                    int usize = u*Constants.TerrainPatchSize;
+                    total += linein[usize + column]*CosineTable16[usize + n];
+                }
+
+                lineout[Constants.TerrainPatchSize*n + column] = total;
+            }
+        }
+
+        private static void IDCTLine16(float[] linein, float[] lineout, int line)
+        {
+            const float oosob = 2.0f/Constants.TerrainPatchSize;
+            int lineSize = line*Constants.TerrainPatchSize;
+
+            for (int n = 0; n < Constants.TerrainPatchSize; n++)
+            {
+                float total = OO_SQRT2*linein[lineSize];
+
+                for (int u = 1; u < Constants.TerrainPatchSize; u++)
+                {
+                    total += linein[lineSize + u]*CosineTable16[u*Constants.TerrainPatchSize + n];
+                }
+
+                lineout[lineSize + n] = total*oosob;
+            }
+        }
+
+/*
+        private static void DCTLine16(float[] linein, float[] lineout, int line)
+        {
+            float total = 0.0f;
+            int lineSize = line * Constants.TerrainPatchSize;
+
+            for (int n = 0; n < Constants.TerrainPatchSize; n++)
+            {
+                total += linein[lineSize + n];
+            }
+
+            lineout[lineSize] = OO_SQRT2 * total;
+
+            int uptr = 0;
+            for (int u = 1; u < Constants.TerrainPatchSize; u++)
+            {
+                total = 0.0f;
+                uptr += Constants.TerrainPatchSize;
+
+                for (int n = 0; n < Constants.TerrainPatchSize; n++)
+                {
+                    total += linein[lineSize + n] * CosineTable16[uptr + n];
+                }
+
+                lineout[lineSize + u] = total;
+            }
+        }
+*/
+
+        private static void DCTLine16(float[] linein, float[] lineout, int line)
+        {
+            // outputs transpose data (lines exchanged with coluns )
+            // so to save a bit of cpu when doing coluns
+            float total = 0.0f;
+            int lineSize = line*Constants.TerrainPatchSize;
+
+            for (int n = 0; n < Constants.TerrainPatchSize; n++)
+            {
+                total += linein[lineSize + n];
+            }
+
+            lineout[line] = OO_SQRT2*total;
+
+            for (int u = Constants.TerrainPatchSize;
+                 u < Constants.TerrainPatchSize*Constants.TerrainPatchSize;
+                 u += Constants.TerrainPatchSize)
+            {
+                total = 0.0f;
+                for (int ptrn = lineSize, ptru = u; ptrn < lineSize + Constants.TerrainPatchSize; ptrn++,ptru++)
+                {
+                    total += linein[ptrn]*CosineTable16[ptru];
+                }
+
+                lineout[line + u] = total;
+            }
+        }
+
+
+        /*
+                private static void DCTColumn16(float[] linein, int[] lineout, int column)
+                {
+                    float total = 0.0f;
+        //            const float oosob = 2.0f / Constants.TerrainPatchSize;
+
+                    for (int n = 0; n < Constants.TerrainPatchSize; n++)
+                    {
+                        total += linein[Constants.TerrainPatchSize * n + column];
+                    }
+
+        //            lineout[CopyMatrix16[column]] = (int)(OO_SQRT2 * total * oosob * QuantizeTable16[column]);
+                    lineout[CopyMatrix16[column]] = (int)(OO_SQRT2 * total * QuantizeTable16[column]);
+
+                    for (int uptr = Constants.TerrainPatchSize; uptr < Constants.TerrainPatchSize * Constants.TerrainPatchSize; uptr += Constants.TerrainPatchSize)
+                    {
+                        total = 0.0f;
+
+                        for (int n = 0; n < Constants.TerrainPatchSize; n++)
+                        {
+                            total += linein[Constants.TerrainPatchSize * n + column] * CosineTable16[uptr + n];
+                        }
+
+        //                lineout[CopyMatrix16[Constants.TerrainPatchSize * u + column]] = (int)(total * oosob * QuantizeTable16[Constants.TerrainPatchSize * u + column]);
+                        lineout[CopyMatrix16[uptr + column]] = (int)(total * QuantizeTable16[uptr + column]);
+                        }
+                }
+
+        private static void DCTColumn16(float[] linein, int[] lineout, int column)
+        {
+            // input columns are in fact stored in lines now
+
+            float total = 0.0f;
+//            const float oosob = 2.0f / Constants.TerrainPatchSize;
+            int inlinesptr = Constants.TerrainPatchSize*column;
+
+            for (int n = 0; n < Constants.TerrainPatchSize; n++)
+            {
+                total += linein[inlinesptr + n];
+            }
+
+            //            lineout[CopyMatrix16[column]] = (int)(OO_SQRT2 * total * oosob * QuantizeTable16[column]);
+            lineout[CopyMatrix16[column]] = (int) (OO_SQRT2*total*QuantizeTable16[column]);
+
+            for (int uptr = Constants.TerrainPatchSize;
+                 uptr < Constants.TerrainPatchSize*Constants.TerrainPatchSize;
+                 uptr += Constants.TerrainPatchSize)
+            {
+                total = 0.0f;
+
+                for (int n = inlinesptr, ptru = uptr; n < inlinesptr + Constants.TerrainPatchSize; n++, ptru++)
+                {
+                    total += linein[n]*CosineTable16[ptru];
+                }
+
+//                lineout[CopyMatrix16[Constants.TerrainPatchSize * u + column]] = (int)(total * oosob * QuantizeTable16[Constants.TerrainPatchSize * u + column]);
+                lineout[CopyMatrix16[uptr + column]] = (int) (total*QuantizeTable16[uptr + column]);
+            }
+        }
+        */
+
+        private static int DCTColumn16Wbits(float[] linein, int[] lineout, int column, int wbits, int maxwbits)
+        {
+            // input columns are in fact stored in lines now
+
+            bool dowbits = wbits != maxwbits;
+            int wbitsMaxValue = 1 << wbits;
+
+            float total = 0.0f;
+            //            const float oosob = 2.0f / Constants.TerrainPatchSize;
+            int inlinesptr = Constants.TerrainPatchSize*column;
+
+            for (int n = 0; n < Constants.TerrainPatchSize; n++)
+            {
+                total += linein[inlinesptr + n];
+            }
+
+            //            lineout[CopyMatrix16[column]] = (int)(OO_SQRT2 * total * oosob * QuantizeTable16[column]);
+            int tmp = (int) (OO_SQRT2*total*QuantizeTable16[column]);
+            lineout[CopyMatrix16[column]] = tmp;
+
+            if (dowbits)
+            {
+                if (tmp < 0) tmp *= -1;
+                while (tmp > wbitsMaxValue)
+                {
+                    wbits++;
+                    wbitsMaxValue = 1 << wbits;
+                    if (wbits == maxwbits)
+                    {
+                        dowbits = false;
+                        break;
+                    }
+                }
+            }
+
+            for (int uptr = Constants.TerrainPatchSize;
+                 uptr < Constants.TerrainPatchSize*Constants.TerrainPatchSize;
+                 uptr += Constants.TerrainPatchSize)
+            {
+                total = 0.0f;
+
+                for (int n = inlinesptr, ptru = uptr; n < inlinesptr + Constants.TerrainPatchSize; n++, ptru++)
+                {
+                    total += linein[n]*CosineTable16[ptru];
+                }
+
+                tmp = (int) (total*QuantizeTable16[uptr + column]);
+                lineout[CopyMatrix16[uptr + column]] = tmp;
+
+                if (dowbits)
+                {
+                    if (tmp < 0) tmp *= -1;
+                    while (tmp > wbitsMaxValue)
+                    {
+                        wbits++;
+                        wbitsMaxValue = 1 << wbits;
+                        if (wbits == maxwbits)
+                        {
+                            dowbits = false;
+                            break;
+                        }
+                    }
+                }
+            }
+            return wbits;
+        }
+
+        public static void DecodePatch(int[] patches, BitPack bitpack, TerrainPatch.Header header, int size)
+        {
+            for (int n = 0; n < size*size; n++)
+            {
+                // ?
+                int temp = bitpack.UnpackBits(1);
+                if (temp != 0)
+                {
+                    // Value or EOB
+                    temp = bitpack.UnpackBits(1);
+                    if (temp != 0)
+                    {
+                        // Value
+                        temp = bitpack.UnpackBits(1);
+                        if (temp != 0)
+                        {
+                            // Negative
+                            temp = bitpack.UnpackBits((int) header.WordBits);
+                            patches[n] = temp*-1;
+                        }
+                        else
+                        {
+                            // Positive
+                            temp = bitpack.UnpackBits((int) header.WordBits);
+                            patches[n] = temp;
+                        }
+                    }
+                    else
+                    {
+                        // Set the rest to zero
+                        // TODO: This might not be necessary
+                        for (int o = n; o < size*size; o++)
+                        {
+                            patches[o] = 0;
+                        }
+                        break;
+                    }
+                }
+                else
+                {
+                    patches[n] = 0;
+                }
+            }
+        }
+
+        private static void EncodePatch(BitPack output, int[] patch, int postquant, int wbits)
+        {
+            int maxwbitssize = (1 << wbits) - 1;
+
+            if (postquant > Constants.TerrainPatchSize*Constants.TerrainPatchSize || postquant < 0)
+            {
+                Logger.Log("Postquant is outside the range of allowed values in EncodePatch()", Helpers.LogLevel.Error);
+                return;
+            }
+
+            if (postquant != 0) patch[Constants.TerrainPatchSize*Constants.TerrainPatchSize - postquant] = 0;
+
+            for (int i = 0; i < Constants.TerrainPatchSize*Constants.TerrainPatchSize; i++)
+            {
+                int temp = patch[i];
+
+                if (temp == 0)
+                {
+                    bool eob = true;
+
+                    for (int j = i; j < Constants.TerrainPatchSize*Constants.TerrainPatchSize - postquant; j++)
+                    {
+                        if (patch[j] != 0)
+                        {
+                            eob = false;
+                            break;
+                        }
+                    }
+
+                    if (eob)
+                    {
+                        output.PackBits(ZERO_EOB, 2);
+                        return;
+                    }
+                    output.PackBits(ZERO_CODE, 1);
+                }
+                else
+                {
+                    if (temp < 0)
+                    {
+                        temp *= -1;
+
+                        if (temp > maxwbitssize) temp = maxwbitssize;
+
+                        output.PackBits(NEGATIVE_VALUE, 3);
+                        output.PackBits(temp, wbits);
+                    }
+                    else
+                    {
+                        if (temp > maxwbitssize) temp = maxwbitssize;
+
+                        output.PackBits(POSITIVE_VALUE, 3);
+                        output.PackBits(temp, wbits);
+                    }
+                }
+            }
+        }
+
+        public static float[] DecompressPatch(int[] patches, TerrainPatch.Header header, TerrainPatch.GroupHeader group)
+        {
+            float[] block = new float[group.PatchSize*group.PatchSize];
+            float[] output = new float[group.PatchSize*group.PatchSize];
+            int prequant = (header.QuantWBits >> 4) + 2;
+            int quantize = 1 << prequant;
+            float ooq = 1.0f/quantize;
+            float mult = ooq*header.Range;
+            float addval = mult*(1 << (prequant - 1)) + header.DCOffset;
+
+            if (group.PatchSize == Constants.TerrainPatchSize)
+            {
+                for (int n = 0; n < Constants.TerrainPatchSize*Constants.TerrainPatchSize; n++)
+                {
+                    block[n] = patches[CopyMatrix16[n]]*DequantizeTable16[n];
+                }
+
+                float[] ftemp = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+
+                for (int o = 0; o < Constants.TerrainPatchSize; o++)
+                    IDCTColumn16(block, ftemp, o);
+                for (int o = 0; o < Constants.TerrainPatchSize; o++)
+                    IDCTLine16(ftemp, block, o);
+            }
+            else
+            {
+                for (int n = 0; n < Constants.TerrainPatchSize*2*Constants.TerrainPatchSize*2; n++)
+                {
+                    block[n] = patches[CopyMatrix32[n]]*DequantizeTable32[n];
+                }
+
+                Logger.Log("Implement IDCTPatchLarge", Helpers.LogLevel.Error);
+            }
+
+            for (int j = 0; j < block.Length; j++)
+            {
+                output[j] = block[j]*mult + addval;
+            }
+
+            return output;
+        }
+
+        private static int[] CompressPatch(float[] patchData, TerrainPatch.Header header, int prequant, out int wbits)
+        {
+            float[] block = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+            int wordsize = (prequant - 2) & 0x0f;
+            float oozrange = 1.0f/header.Range;
+            float range = (1 << prequant);
+            float premult = oozrange*range;
+            float sub = (1 << (prequant - 1)) + header.DCOffset*premult;
+
+            header.QuantWBits = wordsize;
+            header.QuantWBits |= wordsize << 4;
+
+            int k = 0;
+            for (int j = 0; j < Constants.TerrainPatchSize; j++)
+            {
+                for (int i = 0; i < Constants.TerrainPatchSize; i++)
+                    block[k++] = patchData[j*Constants.TerrainPatchSize + i]*premult - sub;
+            }
+
+            float[] ftemp = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+            int[] itemp = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+
+
+            int maxWbits = prequant + 5;
+            wbits = (prequant >> 1);
+
+            for (int o = 0; o < Constants.TerrainPatchSize; o++)
+                DCTLine16(block, ftemp, o);
+            for (int o = 0; o < Constants.TerrainPatchSize; o++)
+                wbits = DCTColumn16Wbits(ftemp, itemp, o, wbits, maxWbits);
+
+            return itemp;
+        }
+
+        private static int[] CompressPatch(float[,] patchData, TerrainPatch.Header header, int prequant, out int wbits)
+        {
+            float[] block = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+            float oozrange = 1.0f/header.Range;
+            float range = (1 << prequant);
+            float premult = oozrange*range;
+            float sub = (1 << (prequant - 1)) + header.DCOffset*premult;
+            int wordsize = (prequant - 2) & 0x0f;
+
+            header.QuantWBits = wordsize;
+            header.QuantWBits |= wordsize << 4;
+
+            int k = 0;
+            for (int j = 0; j < Constants.TerrainPatchSize; j++)
+            {
+                for (int i = 0; i < Constants.TerrainPatchSize; i++)
+                    block[k++] = patchData[j, i]*premult - sub;
+            }
+
+            float[] ftemp = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+            int[] itemp = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+
+            int maxWbits = prequant + 5;
+            wbits = (prequant >> 1);
+
+            for (int o = 0; o < Constants.TerrainPatchSize; o++)
+                DCTLine16(block, ftemp, o);
+            for (int o = 0; o < Constants.TerrainPatchSize; o++)
+                wbits = DCTColumn16Wbits(ftemp, itemp, o, wbits, maxWbits);
+
+            return itemp;
+        }
+
+        private static int[] CompressPatch(TerrainData terrData, int patchX, int patchY, TerrainPatch.Header header,
+                                                               int prequant, out int wbits)
+        {
+            float[] block = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+            int wordsize = prequant;
+            float oozrange = 1.0f/header.Range;
+            float range = (1 << prequant);
+            float premult = oozrange*range;
+            float sub = (1 << (prequant - 1)) + header.DCOffset*premult;
+
+            header.QuantWBits = wordsize - 2;
+            header.QuantWBits |= (prequant - 2) << 4;
+
+            int k = 0;
+
+            int yPatchLimit = patchY >= (terrData.SizeY / Constants.TerrainPatchSize) ?
+                            (terrData.SizeY - Constants.TerrainPatchSize) / Constants.TerrainPatchSize : patchY;
+            yPatchLimit = (yPatchLimit + 1) * Constants.TerrainPatchSize;
+
+            int xPatchLimit = patchX >= (terrData.SizeX / Constants.TerrainPatchSize) ?
+                            (terrData.SizeX - Constants.TerrainPatchSize) / Constants.TerrainPatchSize : patchX;
+            xPatchLimit = (xPatchLimit + 1) * Constants.TerrainPatchSize;
+
+            for (int yy = patchY * Constants.TerrainPatchSize; yy < yPatchLimit; yy++)
+            {
+                for (int xx = patchX * Constants.TerrainPatchSize; xx < xPatchLimit; xx++)
+                {
+                    block[k++] = terrData[xx, yy] * premult - sub;
+                }
+            }
+
+            float[] ftemp = new float[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+            int[] itemp = new int[Constants.TerrainPatchSize*Constants.TerrainPatchSize];
+
+            int maxWbits = prequant + 5;
+            wbits = (prequant >> 1);
+
+            for (int o = 0; o < Constants.TerrainPatchSize; o++)
+                DCTLine16(block, ftemp, o);
+            for (int o = 0; o < Constants.TerrainPatchSize; o++)
+                wbits = DCTColumn16Wbits(ftemp, itemp, o, wbits, maxWbits);
+
+            return itemp;
+        }
+
+        #region Initialization
+
+        private static void BuildDequantizeTable16()
+        {
+            for (int j = 0; j < Constants.TerrainPatchSize; j++)
+            {
+                for (int i = 0; i < Constants.TerrainPatchSize; i++)
+                {
+                    DequantizeTable16[j*Constants.TerrainPatchSize + i] = 1.0f + 2.0f*(i + j);
+                }
+            }
+        }
+
+        private static void BuildQuantizeTable16()
+        {
+            const float oosob = 2.0f/Constants.TerrainPatchSize;
+            for (int j = 0; j < Constants.TerrainPatchSize; j++)
+            {
+                for (int i = 0; i < Constants.TerrainPatchSize; i++)
+                {
+//                    QuantizeTable16[j * Constants.TerrainPatchSize + i] = 1.0f / (1.0f + 2.0f * ((float)i + (float)j));
+                    QuantizeTable16[j*Constants.TerrainPatchSize + i] = oosob/(1.0f + 2.0f*(i + (float) j));
+                }
+            }
+        }
+
+        private static void SetupCosines16()
+        {
+            const float hposz = (float) Math.PI*0.5f/Constants.TerrainPatchSize;
+
+            for (int u = 0; u < Constants.TerrainPatchSize; u++)
+            {
+                for (int n = 0; n < Constants.TerrainPatchSize; n++)
+                {
+                    CosineTable16[u*Constants.TerrainPatchSize + n] = (float) Math.Cos((2.0f*n + 1.0f)*u*hposz);
+                }
+            }
+        }
+
+        private static void BuildCopyMatrix16()
+        {
+            bool diag = false;
+            bool right = true;
+            int i = 0;
+            int j = 0;
+            int count = 0;
+
+            while (i < Constants.TerrainPatchSize && j < Constants.TerrainPatchSize)
+            {
+                CopyMatrix16[j*Constants.TerrainPatchSize + i] = count++;
+
+                if (!diag)
+                {
+                    if (right)
+                    {
+                        if (i < Constants.TerrainPatchSize - 1) i++;
+                        else j++;
+
+                        right = false;
+                        diag = true;
+                    }
+                    else
+                    {
+                        if (j < Constants.TerrainPatchSize - 1) j++;
+                        else i++;
+
+                        right = true;
+                        diag = true;
+                    }
+                }
+                else
+                {
+                    if (right)
+                    {
+                        i++;
+                        j--;
+                        if (i == Constants.TerrainPatchSize - 1 || j == 0) diag = false;
+                    }
+                    else
+                    {
+                        i--;
+                        j++;
+                        if (j == Constants.TerrainPatchSize - 1 || i == 0) diag = false;
+                    }
+                }
+            }
+        }
+
+        #endregion Initialization
+    }
+}
diff --git a/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs b/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
index 8c0ad75..51ecc8d 100644
--- a/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
+++ b/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
@@ -520,7 +520,7 @@ namespace OpenSim.Region.OptionalModules.Agent.InternetRelayClientView.Server
 
         public Vector3 StartPos
         {
-            get { return new Vector3(((int)Constants.RegionSize * 0.5f), ((int)Constants.RegionSize * 0.5f), 50); }
+            get { return new Vector3(m_scene.RegionInfo.RegionSizeX * 0.5f, m_scene.RegionInfo.RegionSizeY * 0.5f, 50f); }
             set { }
         }
 
diff --git a/OpenSim/Region/OptionalModules/Avatar/Chat/IRCConnector.cs b/OpenSim/Region/OptionalModules/Avatar/Chat/IRCConnector.cs
index c5cba8e..f5bd44d 100644
--- a/OpenSim/Region/OptionalModules/Avatar/Chat/IRCConnector.cs
+++ b/OpenSim/Region/OptionalModules/Avatar/Chat/IRCConnector.cs
@@ -52,6 +52,8 @@ namespace OpenSim.Region.OptionalModules.Avatar.Chat
 
         // Local constants
 
+        // This computation is not the real region center if the region is larger than 256.
+        //     This computation isn't fixed because there is not a handle back to the region.
         private static readonly Vector3 CenterOfRegion = new Vector3(((int)Constants.RegionSize * 0.5f), ((int)Constants.RegionSize * 0.5f), 20);
         private static readonly char[] CS_SPACE = { ' ' };
 
diff --git a/OpenSim/Region/OptionalModules/Avatar/Chat/RegionState.cs b/OpenSim/Region/OptionalModules/Avatar/Chat/RegionState.cs
index d4fe5e0..5505001 100644
--- a/OpenSim/Region/OptionalModules/Avatar/Chat/RegionState.cs
+++ b/OpenSim/Region/OptionalModules/Avatar/Chat/RegionState.cs
@@ -44,6 +44,8 @@ namespace OpenSim.Region.OptionalModules.Avatar.Chat
         private static readonly ILog m_log =
             LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
+        // This computation is not the real region center if the region is larger than 256.
+        //     This computation isn't fixed because there is not a handle back to the region.
         private static readonly OpenMetaverse.Vector3 CenterOfRegion = new OpenMetaverse.Vector3(((int)Constants.RegionSize * 0.5f), ((int)Constants.RegionSize * 0.5f), 20);
         private const int DEBUG_CHANNEL = 2147483647;
 
diff --git a/OpenSim/Region/OptionalModules/PrimLimitsModule/PrimLimitsModule.cs b/OpenSim/Region/OptionalModules/PrimLimitsModule/PrimLimitsModule.cs
index a375da9..0bf23f1 100644
--- a/OpenSim/Region/OptionalModules/PrimLimitsModule/PrimLimitsModule.cs
+++ b/OpenSim/Region/OptionalModules/PrimLimitsModule/PrimLimitsModule.cs
@@ -122,8 +122,8 @@ namespace OpenSim.Region.OptionalModules
 
         private bool CanObjectEnter(UUID objectID, bool enteringRegion, Vector3 newPoint, Scene scene)
         {
-            if (newPoint.X < -1f || newPoint.X > (float)(Constants.RegionSize + 1) ||
-                newPoint.Y < -1f || newPoint.Y > (float)(Constants.RegionSize + 1))
+            if (newPoint.X < -1f || newPoint.X > (scene.RegionInfo.RegionSizeX + 1) ||
+                newPoint.Y < -1f || newPoint.Y > (scene.RegionInfo.RegionSizeY) )
                 return true;
 
             SceneObjectPart obj = scene.GetSceneObjectPart(objectID);
diff --git a/OpenSim/Region/OptionalModules/Scripting/RegionReadyModule/RegionReadyModule.cs b/OpenSim/Region/OptionalModules/Scripting/RegionReadyModule/RegionReadyModule.cs
index eb386fe..296ab87 100644
--- a/OpenSim/Region/OptionalModules/Scripting/RegionReadyModule/RegionReadyModule.cs
+++ b/OpenSim/Region/OptionalModules/Scripting/RegionReadyModule/RegionReadyModule.cs
@@ -170,7 +170,10 @@ namespace OpenSim.Region.OptionalModules.Scripting.RegionReady
                 c.Channel = m_channelNotify;
                 c.Message += numScriptsFailed.ToString() + "," + message;
                 c.Type = ChatTypeEnum.Region;
-                c.Position = new Vector3(((int)Constants.RegionSize * 0.5f), ((int)Constants.RegionSize * 0.5f), 30);
+                if (m_scene != null)
+                    c.Position = new Vector3((m_scene.RegionInfo.RegionSizeX * 0.5f), (m_scene.RegionInfo.RegionSizeY * 0.5f), 30);
+                else
+                    c.Position = new Vector3(((int)Constants.RegionSize * 0.5f), ((int)Constants.RegionSize * 0.5f), 30);
                 c.Sender = null;
                 c.SenderUUID = UUID.Zero;
                 c.Scene = m_scene;
diff --git a/OpenSim/Region/OptionalModules/World/SceneCommands/SceneCommandsModule.cs b/OpenSim/Region/OptionalModules/World/SceneCommands/SceneCommandsModule.cs
index 29b39e0..6cbccc0 100644
--- a/OpenSim/Region/OptionalModules/World/SceneCommands/SceneCommandsModule.cs
+++ b/OpenSim/Region/OptionalModules/World/SceneCommands/SceneCommandsModule.cs
@@ -116,37 +116,6 @@ namespace OpenSim.Region.OptionalModules.Avatar.Attachments
                     + "If teleport   is true  then some extra teleport debug information is logged.\n"
                     + "If updates    is true  then any frame which exceeds double the maximum desired frame time is logged.",
                 HandleDebugSceneSetCommand);
-
-            scene.AddCommand(
-                "Regions", 
-                this, "show borders", "show borders", "Show border information for regions", HandleShowBordersCommand);
-        }
-
-        private void HandleShowBordersCommand(string module, string[] args)
-        {
-            StringBuilder sb = new StringBuilder();
-            sb.AppendFormat("Borders for {0}:\n", m_scene.Name);
-
-            ConsoleDisplayTable cdt = new ConsoleDisplayTable();
-            cdt.AddColumn("Cross Direction", 15);
-            cdt.AddColumn("Line", 34);
-            cdt.AddColumn("Trigger Region", 14);
-
-            foreach (Border b in m_scene.NorthBorders)
-                cdt.AddRow(b.CrossDirection, b.BorderLine, string.Format("{0}, {1}", b.TriggerRegionX, b.TriggerRegionY));
-
-            foreach (Border b in m_scene.EastBorders)
-                cdt.AddRow(b.CrossDirection, b.BorderLine, string.Format("{0}, {1}", b.TriggerRegionX, b.TriggerRegionY));
-
-            foreach (Border b in m_scene.SouthBorders)
-                cdt.AddRow(b.CrossDirection, b.BorderLine, string.Format("{0}, {1}", b.TriggerRegionX, b.TriggerRegionY));
-
-            foreach (Border b in m_scene.WestBorders)
-                cdt.AddRow(b.CrossDirection, b.BorderLine, string.Format("{0}, {1}", b.TriggerRegionX, b.TriggerRegionY));
-
-            cdt.AddToStringBuilder(sb);
-
-            MainConsole.Instance.Output(sb.ToString());
         }
 
         private void HandleDebugSceneGetCommand(string module, string[] args)
@@ -263,4 +232,4 @@ namespace OpenSim.Region.OptionalModules.Avatar.Attachments
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/OptionalModules/World/TreePopulator/TreePopulatorModule.cs b/OpenSim/Region/OptionalModules/World/TreePopulator/TreePopulatorModule.cs
index 8144870..e4a3382 100644
--- a/OpenSim/Region/OptionalModules/World/TreePopulator/TreePopulatorModule.cs
+++ b/OpenSim/Region/OptionalModules/World/TreePopulator/TreePopulatorModule.cs
@@ -748,8 +748,8 @@ namespace OpenSim.Region.OptionalModules.World.TreePopulator
             position.X = s_tree.AbsolutePosition.X + (float)randX;
             position.Y = s_tree.AbsolutePosition.Y + (float)randY;
 
-            if (position.X <= ((int)Constants.RegionSize - 1) && position.X >= 0 &&
-                position.Y <= ((int)Constants.RegionSize - 1) && position.Y >= 0 &&
+            if (position.X <= (m_scene.RegionInfo.RegionSizeX - 1) && position.X >= 0 &&
+                position.Y <= (m_scene.RegionInfo.RegionSizeY - 1) && position.Y >= 0 &&
                 Util.GetDistanceTo(position, copse.m_seed_point) <= copse.m_range)
             {
                 UUID uuid = m_scene.RegionInfo.EstateSettings.EstateOwner;
diff --git a/OpenSim/Region/Physics/BasicPhysicsPlugin/BasicPhysicsScene.cs b/OpenSim/Region/Physics/BasicPhysicsPlugin/BasicPhysicsScene.cs
index 0816b7b..8e40561 100644
--- a/OpenSim/Region/Physics/BasicPhysicsPlugin/BasicPhysicsScene.cs
+++ b/OpenSim/Region/Physics/BasicPhysicsPlugin/BasicPhysicsScene.cs
@@ -46,6 +46,7 @@ namespace OpenSim.Region.Physics.BasicPhysicsPlugin
         private List<BasicActor> _actors = new List<BasicActor>();
         private List<BasicPhysicsPrim> _prims = new List<BasicPhysicsPrim>();
         private float[] _heightMap;
+        private Vector3 m_regionExtent;
 
         //protected internal string sceneIdentifier;
 
@@ -58,6 +59,12 @@ namespace OpenSim.Region.Physics.BasicPhysicsPlugin
 
         public override void Initialise(IMesher meshmerizer, IConfigSource config)
         {
+            throw new Exception("Should not be called.");
+        }
+
+        public override void Initialise(IMesher meshmerizer, IConfigSource config, Vector3 regionExtent)
+        {
+            m_regionExtent = regionExtent;
         }
 
         public override void Dispose() {}
@@ -121,23 +128,23 @@ namespace OpenSim.Region.Physics.BasicPhysicsPlugin
                 {
                     actorPosition.Y = 0.1F;
                 }
-                else if (actor.Position.Y >= Constants.RegionSize)
+                else if (actor.Position.Y >= m_regionExtent.Y)
                 {
-                    actorPosition.Y = ((int)Constants.RegionSize - 0.1f);
+                    actorPosition.Y = (m_regionExtent.Y - 0.1f);
                 }
 
                 if (actor.Position.X < 0)
                 {
                     actorPosition.X = 0.1F;
                 }
-                else if (actor.Position.X >= Constants.RegionSize)
+                else if (actor.Position.X >= m_regionExtent.X)
                 {
-                    actorPosition.X = ((int)Constants.RegionSize - 0.1f);
+                    actorPosition.X = (m_regionExtent.X - 0.1f);
                 }
 
                 float terrainHeight = 0;
                 if (_heightMap != null)
-                    terrainHeight = _heightMap[(int)actor.Position.Y * Constants.RegionSize + (int)actor.Position.X];
+                    terrainHeight = _heightMap[(int)actor.Position.Y * (int)m_regionExtent.Y + (int)actor.Position.X];
 
                 float height = terrainHeight + actor.Size.Z;
 
diff --git a/OpenSim/Region/Physics/Manager/PhysicsPluginManager.cs b/OpenSim/Region/Physics/Manager/PhysicsPluginManager.cs
index 8ccfda5..d14edfd 100644
--- a/OpenSim/Region/Physics/Manager/PhysicsPluginManager.cs
+++ b/OpenSim/Region/Physics/Manager/PhysicsPluginManager.cs
@@ -32,6 +32,7 @@ using System.Reflection;
 using Nini.Config;
 using log4net;
 using OpenSim.Framework;
+using OpenMetaverse;
 
 namespace OpenSim.Region.Physics.Manager
 {
@@ -59,6 +60,14 @@ namespace OpenSim.Region.Physics.Manager
             m_log.Info("[PHYSICS]: Added meshing engine: " + plugHard.GetName());
         }
 
+        // Legacy method for simulators before extent was passed
+        public PhysicsScene GetPhysicsScene(string physEngineName, string meshEngineName,
+                                    IConfigSource config, string regionName)
+        {
+            Vector3 extent = new Vector3(Constants.RegionSize, Constants.RegionSize, Constants.RegionHeight);
+            return GetPhysicsScene(physEngineName, meshEngineName, config, regionName, extent);
+        }
+
         /// <summary>
         /// Get a physics scene for the given physics engine and mesher.
         /// </summary>
@@ -66,7 +75,8 @@ namespace OpenSim.Region.Physics.Manager
         /// <param name="meshEngineName"></param>
         /// <param name="config"></param>
         /// <returns></returns>
-        public PhysicsScene GetPhysicsScene(string physEngineName, string meshEngineName, IConfigSource config, string regionName)
+        public PhysicsScene GetPhysicsScene(string physEngineName, string meshEngineName,
+                                    IConfigSource config, string regionName, Vector3 regionExtent)
         {
             if (String.IsNullOrEmpty(physEngineName))
             {
@@ -94,7 +104,7 @@ namespace OpenSim.Region.Physics.Manager
             {
                 m_log.Info("[PHYSICS]: creating " + physEngineName);
                 PhysicsScene result = _PhysPlugins[physEngineName].GetScene(regionName);
-                result.Initialise(meshEngine, config);
+                result.Initialise(meshEngine, config, regionExtent);
                 return result;
             }
             else
diff --git a/OpenSim/Region/Physics/Manager/PhysicsScene.cs b/OpenSim/Region/Physics/Manager/PhysicsScene.cs
index dd9bbc1..4f4ff07 100644
--- a/OpenSim/Region/Physics/Manager/PhysicsScene.cs
+++ b/OpenSim/Region/Physics/Manager/PhysicsScene.cs
@@ -132,8 +132,17 @@ namespace OpenSim.Region.Physics.Manager
             }
         }
 
+        // Deprecated. Do not use this for new physics engines.
         public abstract void Initialise(IMesher meshmerizer, IConfigSource config);
 
+        // For older physics engines that do not implement non-legacy region sizes.
+        // If the physics engine handles the region extent feature, it overrides this function.
+        public virtual void Initialise(IMesher meshmerizer, IConfigSource config, Vector3 regionExtent)
+        {
+            // If not overridden, call the old initialization entry.
+            Initialise(meshmerizer, config);
+        }
+
         /// <summary>
         /// Add an avatar
         /// </summary>
diff --git a/OpenSim/Region/RegionCombinerModule/RegionCombinerModule.cs b/OpenSim/Region/RegionCombinerModule/RegionCombinerModule.cs
index 7127c73..341c8f8 100644
--- a/OpenSim/Region/RegionCombinerModule/RegionCombinerModule.cs
+++ b/OpenSim/Region/RegionCombinerModule/RegionCombinerModule.cs
@@ -134,6 +134,49 @@ namespace OpenSim.Region.RegionCombinerModule
             throw new Exception(string.Format("Region with id {0} not found", regionId));
         }
 
+        // Test to see if this postiion (relative to the region) is within the area covered
+        //    by this megaregion.
+        public bool PositionIsInMegaregion(UUID currentRegion, int xx, int yy)
+        {
+            bool ret = false;
+            if (xx < 0 || yy < 0)
+                return ret;
+
+            foreach (RegionConnections rootRegion in m_regions.Values)
+            {
+                if (currentRegion == rootRegion.RegionId)
+                {
+                    // The caller is in the root region so this is an easy test
+                    if (xx < rootRegion.XEnd && yy < rootRegion.YEnd)
+                    {
+                        ret = true;
+                    }
+                    break;
+                }
+                else
+                {
+                    // Maybe the caller is in one of the sub-regions
+                    foreach (RegionData childRegion in rootRegion.ConnectedRegions)
+                    {
+                        if (currentRegion == childRegion.RegionId)
+                        {
+                            // This is a child. Diddle the offsets and check if in
+                            Vector3 positionInMegaregion = childRegion.Offset;
+                            positionInMegaregion.X += xx;
+                            positionInMegaregion.Y += yy;
+                            if (positionInMegaregion.X < rootRegion.XEnd && positionInMegaregion.Y < rootRegion.YEnd)
+                            {
+                                ret = true;
+                            }
+                            break;
+                        }
+                    }
+                }
+            }
+
+            return ret;
+        }
+
         private void NewPresence(ScenePresence presence)
         {
             if (presence.IsChildAgent)
@@ -220,27 +263,6 @@ namespace OpenSim.Region.RegionCombinerModule
             // 
 */
 
-            // Give each region a standard set of non-infinite borders
-            Border northBorder = new Border();
-            northBorder.BorderLine = new Vector3(0, (int)Constants.RegionSize, (int)Constants.RegionSize);  //<---
-            northBorder.CrossDirection = Cardinals.N;
-            scene.NorthBorders[0] = northBorder;
-
-            Border southBorder = new Border();
-            southBorder.BorderLine = new Vector3(0, (int)Constants.RegionSize, 0);    //--->
-            southBorder.CrossDirection = Cardinals.S;
-            scene.SouthBorders[0] = southBorder;
-
-            Border eastBorder = new Border();
-            eastBorder.BorderLine = new Vector3(0, (int)Constants.RegionSize, (int)Constants.RegionSize);   //<---
-            eastBorder.CrossDirection = Cardinals.E;
-            scene.EastBorders[0] = eastBorder;
-
-            Border westBorder = new Border();
-            westBorder.BorderLine = new Vector3(0, (int)Constants.RegionSize, 0);     //--->
-            westBorder.CrossDirection = Cardinals.W;
-            scene.WestBorders[0] = westBorder;
-
             RegionConnections newConn = new RegionConnections();
             newConn.ConnectedRegions = new List<RegionData>();
             newConn.RegionScene = scene;
@@ -248,8 +270,8 @@ namespace OpenSim.Region.RegionCombinerModule
             newConn.RegionId = scene.RegionInfo.originRegionID;
             newConn.X = scene.RegionInfo.RegionLocX;
             newConn.Y = scene.RegionInfo.RegionLocY;
-            newConn.XEnd = (int)Constants.RegionSize;
-            newConn.YEnd = (int)Constants.RegionSize;
+            newConn.XEnd = scene.RegionInfo.RegionSizeX;
+            newConn.YEnd = scene.RegionInfo.RegionSizeX;
 
             lock (m_regions)
             {
@@ -415,6 +437,11 @@ namespace OpenSim.Region.RegionCombinerModule
                         */
                     #endregion
 
+
+                    // Check to see if this new region is adjacent to the root region.
+                    // Note that we expect the regions to be combined from the root region outward
+                    //    thus the requirement for the ordering in the configuration files.
+
                     // If we're one region over +x y (i.e. root region is to the west)
                     //xxx
                     //xxy
@@ -431,7 +458,7 @@ namespace OpenSim.Region.RegionCombinerModule
                     //xxx
                     if (rootConn.PosX >= newConn.PosX && rootConn.PosY + rootConn.YEnd >= newConn.PosY)
                     {
-                        connectedYN = DoWorkForOneRegionOverXPlusY(rootConn, newConn, scene);
+                        connectedYN = DoWorkForOneRegionOverPlusXY(rootConn, newConn, scene);
                         break;
                     }
 
@@ -441,9 +468,8 @@ namespace OpenSim.Region.RegionCombinerModule
                     //xxx
                     if (rootConn.PosX + rootConn.XEnd >= newConn.PosX && rootConn.PosY + rootConn.YEnd >= newConn.PosY)
                     {
-                        connectedYN = DoWorkForOneRegionOverPlusXPlusY(rootConn, newConn, scene);
+                        connectedYN = DoWorkForOneRegionOverPlusXY(rootConn, newConn, scene);
                         break;
-
                     }
                 }
 
@@ -453,20 +479,20 @@ namespace OpenSim.Region.RegionCombinerModule
                     DoWorkForRootRegion(newConn, scene);
                 }
             }
-
-            // Set up infinite borders around the entire AABB of the combined ConnectedRegions
-            AdjustLargeRegionBounds();
         }
 
         private bool DoWorkForOneRegionOverPlusXY(RegionConnections rootConn, RegionConnections newConn, Scene scene)
         {
+            // Offset (in meters) from the base of this region to the base of the root region.
             Vector3 offset = Vector3.Zero;
             offset.X = newConn.PosX - rootConn.PosX;
             offset.Y = newConn.PosY - rootConn.PosY;
 
+            // The new total size of the region (in meters)
+            // We just extend the X and Y dimensions so the extent might temporarily include areas without regions.
             Vector3 extents = Vector3.Zero;
-            extents.Y = rootConn.YEnd;
-            extents.X = rootConn.XEnd + newConn.XEnd;
+            extents.X = Math.Max(rootConn.XEnd, offset.X + newConn.RegionScene.RegionInfo.RegionSizeX);
+            extents.Y = Math.Max(rootConn.YEnd, offset.Y + newConn.RegionScene.RegionInfo.RegionSizeY);
 
             rootConn.UpdateExtents(extents);
 
@@ -475,9 +501,6 @@ namespace OpenSim.Region.RegionCombinerModule
                 rootConn.RegionScene.RegionInfo.RegionName,
                 newConn.RegionScene.RegionInfo.RegionName, offset, extents);
 
-            scene.BordersLocked = true;
-            rootConn.RegionScene.BordersLocked = true;
-
             RegionData ConnectedRegion = new RegionData();
             ConnectedRegion.Offset = offset;
             ConnectedRegion.RegionId = scene.RegionInfo.originRegionID;
@@ -490,34 +513,10 @@ namespace OpenSim.Region.RegionCombinerModule
             // Inform Child region that it needs to forward it's terrain to the root region
             scene.PhysicsScene.Combine(rootConn.RegionScene.PhysicsScene, offset, Vector3.Zero);
 
-            // Extend the borders as appropriate
-            lock (rootConn.RegionScene.EastBorders)
-                rootConn.RegionScene.EastBorders[0].BorderLine.Z += (int)Constants.RegionSize;
-
-            lock (rootConn.RegionScene.NorthBorders)
-                rootConn.RegionScene.NorthBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-
-            lock (rootConn.RegionScene.SouthBorders)
-                rootConn.RegionScene.SouthBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-
-            lock (scene.WestBorders)
-            {
-                scene.WestBorders[0].BorderLine.Z = (int)((scene.RegionInfo.RegionLocX - rootConn.RegionScene.RegionInfo.RegionLocX) * (int)Constants.RegionSize); //auto teleport West
-
-                // Trigger auto teleport to root region
-                scene.WestBorders[0].TriggerRegionX = rootConn.RegionScene.RegionInfo.RegionLocX;
-                scene.WestBorders[0].TriggerRegionY = rootConn.RegionScene.RegionInfo.RegionLocY;
-            }
-
             // Reset Terrain..  since terrain loads before we get here, we need to load 
             // it again so it loads in the root region
-
             scene.PhysicsScene.SetTerrain(scene.Heightmap.GetFloatsSerialised());
 
-            // Unlock borders
-            rootConn.RegionScene.BordersLocked = false;
-            scene.BordersLocked = false;
-
             // Create a client event forwarder and add this region's events to the root region.
             if (rootConn.ClientEventForwarder != null)
                 rootConn.ClientEventForwarder.AddSceneToEventForwarding(scene);
@@ -525,6 +524,9 @@ namespace OpenSim.Region.RegionCombinerModule
             return true;
         }
 
+        /*
+         * 20140215 radams1: The border stuff was removed and the addition of regions to the mega-regions
+         *   was generalized. These functions are not needed for the generalized solution but left for reference.
         private bool DoWorkForOneRegionOverXPlusY(RegionConnections rootConn, RegionConnections newConn, Scene scene)
         {
             Vector3 offset = Vector3.Zero;
@@ -536,9 +538,6 @@ namespace OpenSim.Region.RegionCombinerModule
             extents.X = rootConn.XEnd;
             rootConn.UpdateExtents(extents);
 
-            scene.BordersLocked = true;
-            rootConn.RegionScene.BordersLocked = true;
-
             RegionData ConnectedRegion = new RegionData();
             ConnectedRegion.Offset = offset;
             ConnectedRegion.RegionId = scene.RegionInfo.originRegionID;
@@ -553,30 +552,11 @@ namespace OpenSim.Region.RegionCombinerModule
             rootConn.RegionScene.PhysicsScene.Combine(null, Vector3.Zero, extents);
             scene.PhysicsScene.Combine(rootConn.RegionScene.PhysicsScene, offset, Vector3.Zero);
 
-            lock (rootConn.RegionScene.NorthBorders)
-                rootConn.RegionScene.NorthBorders[0].BorderLine.Z += (int)Constants.RegionSize;
-
-            lock (rootConn.RegionScene.EastBorders)
-                rootConn.RegionScene.EastBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-
-            lock (rootConn.RegionScene.WestBorders)
-                rootConn.RegionScene.WestBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-
-            lock (scene.SouthBorders)
-            {
-                scene.SouthBorders[0].BorderLine.Z = (int)((scene.RegionInfo.RegionLocY - rootConn.RegionScene.RegionInfo.RegionLocY) * (int)Constants.RegionSize); //auto teleport south
-                scene.SouthBorders[0].TriggerRegionX = rootConn.RegionScene.RegionInfo.RegionLocX;
-                scene.SouthBorders[0].TriggerRegionY = rootConn.RegionScene.RegionInfo.RegionLocY;
-            }
-
             // Reset Terrain..  since terrain normally loads first.
             //conn.RegionScene.PhysicsScene.SetTerrain(conn.RegionScene.Heightmap.GetFloatsSerialised());
             scene.PhysicsScene.SetTerrain(scene.Heightmap.GetFloatsSerialised());
             //conn.RegionScene.PhysicsScene.SetTerrain(conn.RegionScene.Heightmap.GetFloatsSerialised());
 
-            scene.BordersLocked = false;
-            rootConn.RegionScene.BordersLocked = false;
-
             if (rootConn.ClientEventForwarder != null)
                 rootConn.ClientEventForwarder.AddSceneToEventForwarding(scene);
 
@@ -600,9 +580,6 @@ namespace OpenSim.Region.RegionCombinerModule
             extents.Y = rootConn.YEnd;
             extents.X = rootConn.XEnd;
 
-            scene.BordersLocked = true;
-            rootConn.RegionScene.BordersLocked = true;
-
             RegionData ConnectedRegion = new RegionData();
             ConnectedRegion.Offset = offset;
             ConnectedRegion.RegionId = scene.RegionInfo.originRegionID;
@@ -618,67 +595,10 @@ namespace OpenSim.Region.RegionCombinerModule
             rootConn.RegionScene.PhysicsScene.Combine(null, Vector3.Zero, extents);
             scene.PhysicsScene.Combine(rootConn.RegionScene.PhysicsScene, offset, Vector3.Zero);
 
-            lock (rootConn.RegionScene.NorthBorders)
-            {
-                if (rootConn.RegionScene.NorthBorders.Count == 1)// &&  2)
-                {
-                    //compound border
-                    // already locked above
-                    rootConn.RegionScene.NorthBorders[0].BorderLine.Z += (int)Constants.RegionSize;
-
-                    lock (rootConn.RegionScene.EastBorders)
-                        rootConn.RegionScene.EastBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-
-                    lock (rootConn.RegionScene.WestBorders)
-                        rootConn.RegionScene.WestBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-                }
-            }
-
-            lock (scene.SouthBorders)
-            {
-                scene.SouthBorders[0].BorderLine.Z = (int)((scene.RegionInfo.RegionLocY - rootConn.RegionScene.RegionInfo.RegionLocY) * (int)Constants.RegionSize); //auto teleport south
-                scene.SouthBorders[0].TriggerRegionX = rootConn.RegionScene.RegionInfo.RegionLocX;
-                scene.SouthBorders[0].TriggerRegionY = rootConn.RegionScene.RegionInfo.RegionLocY;
-            }
-
-            lock (rootConn.RegionScene.EastBorders)
-            {
-                if (rootConn.RegionScene.EastBorders.Count == 1)// && conn.RegionScene.EastBorders.Count == 2)
-                {
-                    rootConn.RegionScene.EastBorders[0].BorderLine.Z += (int)Constants.RegionSize;
-
-                    lock (rootConn.RegionScene.NorthBorders)
-                        rootConn.RegionScene.NorthBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-
-                    lock (rootConn.RegionScene.SouthBorders)
-                        rootConn.RegionScene.SouthBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-                }
-            }
-
-            lock (scene.WestBorders)
-            {
-                scene.WestBorders[0].BorderLine.Z = (int)((scene.RegionInfo.RegionLocX - rootConn.RegionScene.RegionInfo.RegionLocX) * (int)Constants.RegionSize); //auto teleport West
-                scene.WestBorders[0].TriggerRegionX = rootConn.RegionScene.RegionInfo.RegionLocX;
-                scene.WestBorders[0].TriggerRegionY = rootConn.RegionScene.RegionInfo.RegionLocY;
-            }
-
-            /*
-                                    else
-                                    {
-                                        conn.RegionScene.NorthBorders[0].BorderLine.Z += (int)Constants.RegionSize;
-                                        conn.RegionScene.EastBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-                                        conn.RegionScene.WestBorders[0].BorderLine.Y += (int)Constants.RegionSize;
-                                        scene.SouthBorders[0].BorderLine.Z += (int)Constants.RegionSize; //auto teleport south
-                                    }
-            */
-
-
             // Reset Terrain..  since terrain normally loads first.
             //conn.RegionScene.PhysicsScene.SetTerrain(conn.RegionScene.Heightmap.GetFloatsSerialised());
             scene.PhysicsScene.SetTerrain(scene.Heightmap.GetFloatsSerialised());
             //conn.RegionScene.PhysicsScene.SetTerrain(conn.RegionScene.Heightmap.GetFloatsSerialised());
-            scene.BordersLocked = false;
-            rootConn.RegionScene.BordersLocked = false;
 
             if (rootConn.ClientEventForwarder != null)
                 rootConn.ClientEventForwarder.AddSceneToEventForwarding(scene);
@@ -687,6 +607,7 @@ namespace OpenSim.Region.RegionCombinerModule
 
             //scene.PhysicsScene.Combine(conn.RegionScene.PhysicsScene, offset,extents);
         }
+         */
 
         private void DoWorkForRootRegion(RegionConnections rootConn, Scene scene)
         {
@@ -885,125 +806,6 @@ namespace OpenSim.Region.RegionCombinerModule
 //            }
 //        }
 
-        // Create a set of infinite borders around the whole aabb of the combined island.
-        private void AdjustLargeRegionBounds()
-        {
-            lock (m_regions)
-            {
-                foreach (RegionConnections rconn in m_regions.Values)
-                {
-                    Vector3 offset = Vector3.Zero;
-                    rconn.RegionScene.BordersLocked = true;
-                    foreach (RegionData rdata in rconn.ConnectedRegions)
-                    {
-                        if (rdata.Offset.X > offset.X) offset.X = rdata.Offset.X;
-                        if (rdata.Offset.Y > offset.Y) offset.Y = rdata.Offset.Y;
-                    }
-
-                    lock (rconn.RegionScene.NorthBorders)
-                    {
-                        Border northBorder = null;
-                        // If we don't already have an infinite border, create one.
-                        if (!TryGetInfiniteBorder(rconn.RegionScene.NorthBorders, out northBorder))
-                        {
-                            northBorder = new Border();
-                            rconn.RegionScene.NorthBorders.Add(northBorder);
-                        }
-                        
-                        northBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue,
-                                                             offset.Y + (int) Constants.RegionSize); //<---
-                        northBorder.CrossDirection = Cardinals.N;
-                    }
-
-                    lock (rconn.RegionScene.SouthBorders)
-                    {
-                        Border southBorder = null;
-                        // If we don't already have an infinite border, create one.
-                        if (!TryGetInfiniteBorder(rconn.RegionScene.SouthBorders, out southBorder))
-                        {
-                            southBorder = new Border();
-                            rconn.RegionScene.SouthBorders.Add(southBorder);
-                        }
-                        southBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, 0); //--->
-                        southBorder.CrossDirection = Cardinals.S;
-                    }
-
-                    lock (rconn.RegionScene.EastBorders)
-                    {
-                        Border eastBorder = null;
-                        // If we don't already have an infinite border, create one.
-                        if (!TryGetInfiniteBorder(rconn.RegionScene.EastBorders, out eastBorder))
-                        {
-                            eastBorder = new Border();
-                            rconn.RegionScene.EastBorders.Add(eastBorder);
-                        }
-                        eastBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, offset.X + (int)Constants.RegionSize);
-                        //<---
-                        eastBorder.CrossDirection = Cardinals.E;
-                    }
-
-                    lock (rconn.RegionScene.WestBorders)
-                    {
-                        Border westBorder = null;
-                        // If we don't already have an infinite border, create one.
-                        if (!TryGetInfiniteBorder(rconn.RegionScene.WestBorders, out westBorder))
-                        {
-                            westBorder = new Border();
-                            rconn.RegionScene.WestBorders.Add(westBorder);
-
-                        }
-                        westBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, 0); //--->
-                        westBorder.CrossDirection = Cardinals.W;
-                    }
-
-                    rconn.RegionScene.BordersLocked = false;
-                }
-            }
-        }
-
-        /// <summary>
-        /// Try and get an Infinite border out of a listT of borders
-        /// </summary>
-        /// <param name="borders"></param>
-        /// <param name="oborder"></param>
-        /// <returns></returns>
-        public static bool TryGetInfiniteBorder(List<Border> borders, out Border oborder)
-        {
-            // Warning! Should be locked before getting here!
-            foreach (Border b in borders)
-            {
-                if (b.BorderLine.X == float.MinValue && b.BorderLine.Y == float.MaxValue)
-                {
-                    oborder = b;
-                    return true;
-                }
-            }
-
-            oborder = null;
-            return false;
-        }
-       
-        public RegionData GetRegionFromPosition(Vector3 pPosition)
-        {
-            pPosition = pPosition/(int) Constants.RegionSize;
-            int OffsetX = (int) pPosition.X;
-            int OffsetY = (int) pPosition.Y;
-
-            lock (m_regions)
-            {
-                foreach (RegionConnections regConn in m_regions.Values)
-                {
-                    foreach (RegionData reg in regConn.ConnectedRegions)
-                    {
-                        if (reg.Offset.X == OffsetX && reg.Offset.Y == OffsetY)
-                            return reg;
-                    }
-                }
-            }
-
-            return new RegionData();
-        }
-
         public void ForwardPermissionRequests(RegionConnections BigRegion, Scene VirtualRegion)
         {
             if (BigRegion.PermissionModule == null)
diff --git a/OpenSim/Region/RegionCombinerModule/RegionConnections.cs b/OpenSim/Region/RegionCombinerModule/RegionConnections.cs
index fba51d2..6bf1c4a 100644
--- a/OpenSim/Region/RegionCombinerModule/RegionConnections.cs
+++ b/OpenSim/Region/RegionCombinerModule/RegionConnections.cs
@@ -64,12 +64,12 @@ namespace OpenSim.Region.RegionCombinerModule
         /// <summary>
         /// The X meters position of this connection.
         /// </summary>
-        public uint PosX { get { return X * Constants.RegionSize; } }
+        public uint PosX { get { return Util.RegionToWorldLoc(X); } }
 
         /// <summary>
         /// The Y meters co-ordinate of this connection.
         /// </summary>
-        public uint PosY { get { return Y * Constants.RegionSize; } }
+        public uint PosY { get { return Util.RegionToWorldLoc(Y); } }
 
         /// <summary>
         /// The size of the megaregion in meters.
@@ -91,4 +91,4 @@ namespace OpenSim.Region.RegionCombinerModule
             YEnd = (uint)extents.Y;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index 3c8f54f..b5ba4a0 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -2352,7 +2352,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             //
             // This workaround is to prevent silent failure of this function.
             // According to the specification on the SL Wiki, providing a position outside of the
-            if (pos.x < 0 || pos.x > Constants.RegionSize || pos.y < 0 || pos.y > Constants.RegionSize)
+            if (pos.x < 0 || pos.x > World.RegionInfo.RegionSizeX || pos.y < 0 || pos.y > World.RegionInfo.RegionSizeY)
             {
                 return 0;
             }
@@ -2362,9 +2362,9 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                 m_host.ParentGroup.IsAttachment || // return FALSE if attachment
                 (
                     pos.x < -10.0 || // return FALSE if more than 10 meters into a west-adjacent region.
-                    pos.x > (Constants.RegionSize + 10) || // return FALSE if more than 10 meters into a east-adjacent region.
+                    pos.x > (World.RegionInfo.RegionSizeX + 10) || // return FALSE if more than 10 meters into a east-adjacent region.
                     pos.y < -10.0 || // return FALSE if more than 10 meters into a south-adjacent region.
-                    pos.y > (Constants.RegionSize + 10) || // return FALSE if more than 10 meters into a north-adjacent region.
+                    pos.y > (World.RegionInfo.RegionSizeY + 10) || // return FALSE if more than 10 meters into a north-adjacent region.
                     pos.z > Constants.RegionHeight // return FALSE if altitude than 4096m
                 )
             )
@@ -4655,10 +4655,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                         DataserverPlugin.RegisterRequest(m_host.LocalId,
                                                      m_item.ItemID, item.AssetID.ToString());
 
-                    Vector3 region = new Vector3(
-                        World.RegionInfo.RegionLocX * Constants.RegionSize,
-                        World.RegionInfo.RegionLocY * Constants.RegionSize,
-                        0);
+                    Vector3 region = new Vector3(World.RegionInfo.WorldLocX, World.RegionInfo.WorldLocY, 0);
 
                     World.AssetService.Get(item.AssetID.ToString(), this,
                         delegate(string i, object sender, AssetBase a)
@@ -5949,7 +5946,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         public LSL_Vector llGetRegionCorner()
         {
             m_host.AddScriptLPS(1);
-            return new LSL_Vector(World.RegionInfo.RegionLocX * Constants.RegionSize, World.RegionInfo.RegionLocY * Constants.RegionSize, 0);
+            return new LSL_Vector(World.RegionInfo.WorldLocX, World.RegionInfo.WorldLocY, 0);
         }
 
         /// <summary>
@@ -6104,7 +6101,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                 LSL_Float mag;
                 if (dir.x > 0)
                 {
-                    mag = (Constants.RegionSize - pos.x) / dir.x;
+                    mag = (World.RegionInfo.RegionSizeX - pos.x) / dir.x;
                 }
                 else
                 {
@@ -6115,7 +6112,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
                 edge.y = pos.y + (dir.y * mag);
 
-                if (edge.y > Constants.RegionSize || edge.y < 0)
+                if (edge.y > World.RegionInfo.RegionSizeY || edge.y < 0)
                 {
                     // Y goes out of bounds first
                     edge.y = dir.y / Math.Abs(dir.y);
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
index d2a5980..01d90e7 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
@@ -459,7 +459,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         {
             m_host.AddScriptLPS(1);
 
-            if (x > ((int)Constants.RegionSize - 1) || x < 0 || y > ((int)Constants.RegionSize - 1) || y < 0)
+            if (x > (World.RegionInfo.RegionSizeX - 1) || x < 0 || y > (World.RegionInfo.RegionSizeY - 1) || y < 0)
                 OSSLError("osSetTerrainHeight: Coordinate out of bounds");
 
             if (World.Permissions.CanTerraformLand(m_host.OwnerID, new Vector3(x, y, 0)))
@@ -489,7 +489,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         private LSL_Float GetTerrainHeight(int x, int y)
         {
             m_host.AddScriptLPS(1);
-            if (x > ((int)Constants.RegionSize - 1) || x < 0 || y > ((int)Constants.RegionSize - 1) || y < 0)
+            if (x > (World.RegionInfo.RegionSizeX - 1) || x < 0 || y > (World.RegionInfo.RegionSizeY - 1) || y < 0)
                 OSSLError("osGetTerrainHeight: Coordinate out of bounds");
 
             return World.Heightmap[x, y];
@@ -823,7 +823,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         private void TeleportAgent(string agent, int regionX, int regionY,
             LSL_Types.Vector3 position, LSL_Types.Vector3 lookat, bool relaxRestrictions)
         {
-            ulong regionHandle = Util.UIntsToLong(((uint)regionX * (uint)Constants.RegionSize), ((uint)regionY * (uint)Constants.RegionSize));
+            ulong regionHandle = Util.RegionLocToHandle((uint)regionX, (uint)regionY);
 
             m_host.AddScriptLPS(1);
             UUID agentId = new UUID();
@@ -3024,7 +3024,9 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             }
             else
             {
-                return new LSL_Vector((float)Constants.RegionSize, (float)Constants.RegionSize, Constants.RegionHeight);
+                return new LSL_Vector((float)World.RegionInfo.RegionSizeX,
+                            (float)World.RegionInfo.RegionSizeY,
+                            (float)World.RegionInfo.RegionSizeZ );
             }
         }
 
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
index 9cf7b35..8666421 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
@@ -708,18 +708,20 @@ namespace OpenSim.Region.ScriptEngine.Shared.ScriptBase
             }
             private void Save()
             {
+                /* Remove temporarily until we have a handle to the region size
                 if (Position.x > ((int)Constants.RegionSize - 1))
                     Position.x = ((int)Constants.RegionSize - 1);
-                if (Position.x < 0)
-                    Position.x = 0;
                 if (Position.y > ((int)Constants.RegionSize - 1))
                     Position.y = ((int)Constants.RegionSize - 1);
+                 */
+                if (Position.x < 0)
+                    Position.x = 0;
                 if (Position.y < 0)
                     Position.y = 0;
-                if (Position.z > 768)
-                    Position.z = 768;
                 if (Position.z < 0)
                     Position.z = 0;
+                if (Position.z > Constants.RegionHeight)
+                    Position.z = Constants.RegionHeight;
                 prim.OSSL.llSetPos(Position);
             }