59 files changed, 2202 insertions, 1098 deletions

diff --git a/OpenSim/Region/Application/OpenSimBase.cs b/OpenSim/Region/Application/OpenSimBase.cs
index 308638c..0dc9306 100644
--- a/OpenSim/Region/Application/OpenSimBase.cs
+++ b/OpenSim/Region/Application/OpenSimBase.cs
@@ -690,7 +690,8 @@ namespace OpenSim
             clientServer = clientNetworkServers;
             scene.LoadWorldMap();
 
-            scene.PhysicsScene = GetPhysicsScene(scene.RegionInfo.RegionName);
+            Vector3 regionExtent = new Vector3(regionInfo.RegionSizeX, regionInfo.RegionSizeY, regionInfo.RegionSizeZ);
+            scene.PhysicsScene = GetPhysicsScene(scene.RegionInfo.RegionName, regionExtent);
             scene.PhysicsScene.RequestAssetMethod = scene.PhysicsRequestAsset;
             scene.PhysicsScene.SetTerrain(scene.Heightmap.GetFloatsSerialised());
             scene.PhysicsScene.SetWaterLevel((float) regionInfo.RegionSettings.WaterHeight);
@@ -752,10 +753,10 @@ namespace OpenSim
 
         # region Setup methods
 
-        protected override PhysicsScene GetPhysicsScene(string osSceneIdentifier)
+        protected override PhysicsScene GetPhysicsScene(string osSceneIdentifier, Vector3 regionExtent)
         {
             return GetPhysicsScene(
-                m_configSettings.PhysicsEngine, m_configSettings.MeshEngineName, Config, osSceneIdentifier);
+                m_configSettings.PhysicsEngine, m_configSettings.MeshEngineName, Config, osSceneIdentifier, regionExtent);
         }
 
         /// <summary>
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
index 3a0ddae..6861f5b 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
@@ -34,11 +34,13 @@ using System.Text;
 using System.Threading;
 using System.Timers;
 using System.Xml;
+
 using log4net;
 using OpenMetaverse;
 using OpenMetaverse.Packets;
 using OpenMetaverse.Messages.Linden;
 using OpenMetaverse.StructuredData;
+
 using OpenSim.Framework;
 using OpenSim.Framework.Client;
 using OpenSim.Framework.Monitoring;
@@ -48,7 +50,6 @@ using OpenSim.Services.Interfaces;
 using Timer = System.Timers.Timer;
 using AssetLandmark = OpenSim.Framework.AssetLandmark;
 using RegionFlags = OpenMetaverse.RegionFlags;
-using Nini.Config;
 
 using System.IO;
 using PermissionMask = OpenSim.Framework.PermissionMask;
@@ -307,6 +308,7 @@ 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>
@@ -447,7 +449,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
 //        ~LLClientView()
 //        {
-//            m_log.DebugFormat("[LLCLIENTVIEW]: Destructor called for {0}, circuit code {1}", Name, CircuitCode);
+//            m_log.DebugFormat("{0} Destructor called for {1}, circuit code {2}", LogHeader, Name, CircuitCode);
 //        }
 
         /// <summary>
@@ -513,9 +515,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 // there is some unidentified connection problem, not where we have issues due to deadlock
                 if (!IsActive && !force)
                 {
-                    m_log.DebugFormat(
-                        "[CLIENT]: Not attempting to close inactive client {0} in {1} since force flag is not set", 
-                        Name, m_scene.Name);
+                    m_log.DebugFormat( "{0} Not attempting to close inactive client {1} in {2} since force flag is not set", 
+                        LogHeader, Name, m_scene.Name);
 
                     return;
                 }
@@ -1153,7 +1154,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// <param name="map">heightmap</param>
         public virtual void SendLayerData(float[] map)
         {
-            Util.FireAndForget(DoSendLayerData, map);
+            Util.FireAndForget(DoSendLayerData, m_scene.Heightmap.GetTerrainData());
         }
 
         /// <summary>
@@ -1162,10 +1163,11 @@ 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++)
@@ -1175,7 +1177,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 //}
 
                 // Send LayerData in a spiral pattern. Fun!
-                SendLayerTopRight(map, 0, 0, 15, 15);
+                SendLayerTopRight(map, 0, 0, map.SizeX/Constants.TerrainPatchSize-1, map.SizeY/Constants.TerrainPatchSize-1);
             }
             catch (Exception e)
             {
@@ -1183,7 +1185,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             }
         }
 
-        private void SendLayerTopRight(float[] map, int x1, int y1, int x2, int y2)
+        private void SendLayerTopRight(TerrainData map, int x1, int y1, int x2, int y2)
         {
             // Row
             for (int i = x1; i <= x2; i++)
@@ -1193,11 +1195,11 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             for (int j = y1 + 1; j <= y2; j++)
                 SendLayerData(x2, j, map);
 
-            if (x2 - x1 > 0)
+            if (x2 - x1 > 0 && y2 - y1 > 0)
                 SendLayerBottomLeft(map, x1, y1 + 1, x2 - 1, y2);
         }
 
-        void SendLayerBottomLeft(float[] map, int x1, int y1, int x2, int y2)
+        void SendLayerBottomLeft(TerrainData map, int x1, int y1, int x2, int y2)
         {
             // Row in reverse
             for (int i = x2; i >= x1; i--)
@@ -1207,7 +1209,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             for (int j = y2 - 1; j >= y1; j--)
                 SendLayerData(x1, j, map);
 
-            if (x2 - x1 > 0)
+            if (x2 - x1 > 0 && y2 - y1 > 0)
                 SendLayerTopRight(map, x1 + 1, y1, x2, y2 - 1);
         }
 
@@ -1229,22 +1231,26 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         //     OutPacket(layerpack, ThrottleOutPacketType.Land);
         // }
 
+        // 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.
+        public void SendLayerData(int px, int py, float[] map)
+        {
+            SendLayerData(px, py, m_scene.Heightmap.GetTerrainData());
+        }
+
         /// <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)
         {
             try
             {
-                int[] patches = new int[] { py * 16 + px };
-                float[] heightmap = (map.Length == 65536) ?
-                    map :
-                    LLHeightFieldMoronize(map);
-
-                LayerDataPacket layerpack = TerrainCompressor.CreateLandPacket(heightmap, patches);
+                LayerDataPacket layerpack = OpenSimTerrainCompressor.CreateLandPacket(terrData, px, py);
                 
                 // 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.
@@ -1262,14 +1268,12 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 if (m_justEditedTerrain)
                 {
                     layerpack.Header.Reliable = false;
-                    OutPacket(layerpack,
-                               ThrottleOutPacketType.Unknown );
+                    OutPacket(layerpack, ThrottleOutPacketType.Unknown );
                 }
                 else
                 {
                     layerpack.Header.Reliable = true;
-                    OutPacket(layerpack,
-                               ThrottleOutPacketType.Land);
+                    OutPacket(layerpack, ThrottleOutPacketType.Land);
                 }
             }
             catch (Exception e)
@@ -1279,38 +1283,6 @@ 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)
-        {
-            if (map.Length == 65536)
-                return map;
-            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;
-            }
-
-        }
-
-        /// <summary>
         ///  Send the wind matrix to the client
         /// </summary>
         /// <param name="windSpeeds">16x16 array of wind speeds</param>
@@ -2785,8 +2757,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         {
             if (req.AssetInf.Data == null)
             {
-                m_log.ErrorFormat("Cannot send asset {0} ({1}), asset data is null",
-                    req.AssetInf.ID, req.AssetInf.Metadata.ContentType);
+                m_log.ErrorFormat("{0} Cannot send asset {1} ({2}), asset data is null",
+                                LogHeader, req.AssetInf.ID, req.AssetInf.Metadata.ContentType);
                 return;
             }
 
diff --git a/OpenSim/Region/ClientStack/RegionApplicationBase.cs b/OpenSim/Region/ClientStack/RegionApplicationBase.cs
index 853b72d..1ce166e 100644
--- a/OpenSim/Region/ClientStack/RegionApplicationBase.cs
+++ b/OpenSim/Region/ClientStack/RegionApplicationBase.cs
@@ -69,7 +69,7 @@ namespace OpenSim.Region.ClientStack
         /// The name of the OpenSim scene this physics scene is serving.  This will be used in log messages.
         /// </param>
         /// <returns></returns>
-        protected abstract PhysicsScene GetPhysicsScene(string osSceneIdentifier);
+        protected abstract PhysicsScene GetPhysicsScene(string osSceneIdentifier, Vector3 regionExtent);
         
         protected abstract ClientStackManager CreateClientStackManager();
         protected abstract Scene CreateScene(RegionInfo regionInfo, ISimulationDataService simDataService, IEstateDataService estateDataService, AgentCircuitManager circuitManager);
@@ -123,13 +123,13 @@ namespace OpenSim.Region.ClientStack
         /// </param>
         /// <returns></returns>
         protected PhysicsScene GetPhysicsScene(
-            string engine, string meshEngine, IConfigSource config, string osSceneIdentifier)
+            string engine, string meshEngine, IConfigSource config, string osSceneIdentifier, Vector3 regionExtent)
         {
             PhysicsPluginManager physicsPluginManager;
             physicsPluginManager = new PhysicsPluginManager();
             physicsPluginManager.LoadPluginsFromAssemblies("Physics");
             
-            return physicsPluginManager.GetPhysicsScene(engine, meshEngine, config, osSceneIdentifier);
+            return physicsPluginManager.GetPhysicsScene(engine, meshEngine, config, osSceneIdentifier, regionExtent);
         }
     }
 }
\ No newline at end of file
diff --git a/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs b/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs
index 27ace68..10122e6 100644
--- a/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs
@@ -189,8 +189,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
             string message = c.Message;
             Scene scene = (Scene)c.Scene;
             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);
 
             if (c.Channel == DEBUG_CHANNEL) c.Type = ChatTypeEnum.DebugChannel;
 
@@ -342,8 +341,7 @@ 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 bfa30e6..7e50cc6 100644
--- a/OpenSim/Region/CoreModules/Avatar/UserProfiles/UserProfileModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/UserProfiles/UserProfileModule.cs
@@ -667,8 +667,8 @@ 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;
diff --git a/OpenSim/Region/CoreModules/Framework/Caps/CapabilitiesModule.cs b/OpenSim/Region/CoreModules/Framework/Caps/CapabilitiesModule.cs
index 6545a99..13cc99a 100644
--- a/OpenSim/Region/CoreModules/Framework/Caps/CapabilitiesModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/Caps/CapabilitiesModule.cs
@@ -269,9 +269,7 @@ 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 246b253..4ab36a5 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -51,7 +51,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
     [Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule", Id = "EntityTransferModule")]
     public class EntityTransferModule : INonSharedRegionModule, IEntityTransferModule
     {
-        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 = "[ENTITY TRANSFER MODULE]";
 
         public const int DefaultMaxTransferDistance = 4095;
@@ -121,8 +121,53 @@ 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)
+            {
+                if (!m_bannedRegions.TryGetValue(pAgentID, out m_idCache))
+                {
+                    m_idCache = new ExpiringCache<ulong, DateTime>();
+                    m_bannedRegions.Add(pAgentID, m_idCache, TimeSpan.FromSeconds(45));
+                }
+                m_idCache.Add(pRegionHandle, DateTime.Now + TimeSpan.FromSeconds(15), TimeSpan.FromSeconds(15));
+            }
+            // 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 +382,7 @@ 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))
@@ -434,10 +480,7 @@ 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];
 
             float newPosZ = posZLimit + localAVHeight;
             if (posZLimit >= (position.Z - (localAVHeight / 2)) && !(Single.IsInfinity(newPosZ) || Single.IsNaN(newPosZ)))
@@ -481,7 +524,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             Vector3 lookAt, uint teleportFlags, out GridRegion finalDestination)
         {
             uint x = 0, y = 0;
-            Utils.LongToUInts(regionHandle, out x, out y);
+            Util.RegionHandleToWorldLoc(regionHandle, out x, out y);
             GridRegion reg = Scene.GridService.GetRegionByPosition(sp.Scene.RegionInfo.ScopeID, (int)x, (int)y);
 
             if (reg != null)
@@ -490,9 +533,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
                 if (finalDestination == null)
                 {
-                    m_log.WarnFormat(
-                        "[ENTITY TRANSFER MODULE]: Final destination is having problems. Unable to teleport {0} {1}",
-                        sp.Name, sp.UUID);
+                    m_log.WarnFormat( "{0} Final destination is having problems. Unable to teleport {1} {2}",
+                                            LogHeader, sp.Name, sp.UUID);
 
                     sp.ControllingClient.SendTeleportFailed("Problem at destination");
                     return;
@@ -533,11 +575,11 @@ 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.X = (ushort)regX;
+                block.Y = (ushort)regY;
                 block.Access = 254; // == not there
 
                 List<MapBlockData> blocks = new List<MapBlockData>();
@@ -1349,6 +1391,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 if (uinfo.HomeRegionID == UUID.Zero)
                 {
                     // can't find the Home region: Tell viewer and abort
+                    m_log.ErrorFormat("{0} No grid user info found for {1} {2}. Cannot send home.",
+                                    LogHeader, client.Name, client.AgentId);
                     client.SendTeleportFailed("You don't have a home position set.");
                     return false;
                 }
@@ -1382,7 +1426,11 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
         #region Agent Crossings
 
-        public GridRegion GetDestination(Scene scene, UUID agentID, Vector3 pos, out uint xDest, out uint yDest, out string version, out Vector3 newpos)
+        // 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)
         {
             version = String.Empty;
             newpos = new Vector3(pos.X, pos.Y, pos.Z);
@@ -1390,131 +1438,54 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 //            m_log.DebugFormat(
 //                "[ENTITY TRANSFER MODULE]: Crossing agent {0} at pos {1} in {2}", agent.Name, pos, scene.Name);
 
-            uint neighbourx = scene.RegionInfo.RegionLocX;
-            uint neighboury = scene.RegionInfo.RegionLocY;
-            const float boundaryDistance = 1.7f;
-            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);
+            // Compute world location of the object's position
+            double presenceWorldX = (double)scene.RegionInfo.WorldLocX + pos.X;
+            double presenceWorldY = (double)scene.RegionInfo.WorldLocY + pos.Y;
 
-            // distance into new region to place avatar
-            const float enterDistance = 0.5f;
+            // 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));
 
-            if (scene.TestBorderCross(pos + westCross, Cardinals.W))
+            if (neighbourRegion != null)
             {
-                if (scene.TestBorderCross(pos + northCross, Cardinals.N))
-                {
-                    Border b = scene.GetCrossedBorder(pos + northCross, Cardinals.N);
-                    neighboury += (uint)(int)(b.BorderLine.Z / (int)Constants.RegionSize);
-                }
-                else if (scene.TestBorderCross(pos + southCross, Cardinals.S))
-                {
-                    neighboury--;
-                    newpos.Y = Constants.RegionSize - enterDistance;
-                }
-
-                neighbourx--;
-                newpos.X = Constants.RegionSize - enterDistance;
-            }
-            else if (scene.TestBorderCross(pos + eastCross, Cardinals.E))
-            {
-                Border b = scene.GetCrossedBorder(pos + eastCross, Cardinals.E);
-                neighbourx += (uint)(int)(b.BorderLine.Z / (int)Constants.RegionSize);
-                newpos.X = enterDistance;
+                // 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 - enterDistance;
+                    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 = enterDistance;
+                    // 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 - enterDistance;
-            }
-            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 = enterDistance;
-            }
-
-            /*
-
-            if (pos.X < boundaryDistance) //West
-            {
-                neighbourx--;
-                newpos.X = Constants.RegionSize - enterDistance;
-            }
-            else if (pos.X > Constants.RegionSize - boundaryDistance) // East
-            {
-                neighbourx++;
-                newpos.X = enterDistance;
-            }
-
-            if (pos.Y < boundaryDistance) // South
-            {
-                neighboury--;
-                newpos.Y = Constants.RegionSize - enterDistance;
-            }
-            else if (pos.Y > Constants.RegionSize - boundaryDistance) // North
-            {
-                neighboury++;
-                newpos.Y = enterDistance;
-            }
-            */
-
-            xDest = neighbourx;
-            yDest = neighboury;
-
-            int x = (int)(neighbourx * Constants.RegionSize), 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 reason;
+                if (neighbourRegion != null
+                    && !scene.SimulationService.QueryAccess(neighbourRegion, agentID, newpos, out version, out reason))
                 {
-                    if (DateTime.Now < banUntil)
-                        return null;
-                    r.Remove(neighbourHandle);
+                    // remember banned
+                    m_bannedRegionCache.Add(neighbourRegion.RegionHandle, agentID);
+                    neighbourRegion = null;
                 }
             }
-            else
-            {
-                r = null;
-            }
-
-            GridRegion neighbourRegion = scene.GridService.GetRegionByPosition(scene.RegionInfo.ScopeID, (int)x, (int)y);
 
-            string reason;
-            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;
-            }
+            if (neighbourRegion == 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;
         }
@@ -1526,7 +1497,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             Vector3 newpos;
             string version;
 
-            GridRegion neighbourRegion = GetDestination(agent.Scene, agent.UUID, agent.AbsolutePosition, out x, out y, out version, out newpos);
+            GridRegion neighbourRegion = GetDestination(agent.Scene, agent.UUID, agent.AbsolutePosition, out version, out newpos);
             if (neighbourRegion == null)
             {
                 agent.ControllingClient.SendAlertMessage("Cannot region cross into banned parcel");
@@ -1568,7 +1539,7 @@ 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);
@@ -1578,11 +1549,7 @@ 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);
@@ -1635,17 +1602,22 @@ 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)
         {
+            m_log.DebugFormat("{0} CrossAgentToNewRegionAsync: new region={1} at <{2},{3}>. newpos={4}",
+                        LogHeader, neighbourRegion.RegionName, neighbourRegion.RegionLocX, neighbourRegion.RegionLocY, pos);
+
             if (!CrossAgentToNewRegionPrep(agent, neighbourRegion))
             {
+                m_log.DebugFormat("{0} CrossAgentToNewRegionAsync: prep failed. Resetting transfer state", LogHeader);
                 m_entityTransferStateMachine.ResetFromTransit(agent.UUID);
                 return agent;
             }
 
             if (!CrossAgentIntoNewRegionMain(agent, pos, neighbourRegion, isFlying))
             {
+                m_log.DebugFormat("{0} CrossAgentToNewRegionAsync: cross main failed. Resetting transfer state", LogHeader);
                 m_entityTransferStateMachine.ResetFromTransit(agent.UUID);
                 return agent;
             }
@@ -2038,15 +2010,195 @@ 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 lost 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)
@@ -2168,16 +2320,19 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             // 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;
+                // 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.DrawDistance, 
+                                Math.Max(Scene.RegionInfo.RegionSizeX, Scene.RegionInfo.RegionSizeY));
 
-                int startX = (int)pRegionLocX * (int)Constants.RegionSize - dd + (int)(Constants.RegionSize/2);
-                int startY = (int)pRegionLocY * (int)Constants.RegionSize - dd + (int)(Constants.RegionSize/2);
+                uint startX = Util.RegionToWorldLoc(pRegionLocX) - dd + Constants.RegionSize/2;
+                uint startY = Util.RegionToWorldLoc(pRegionLocY) - dd + Constants.RegionSize/2;
 
-                int endX = (int)pRegionLocX * (int)Constants.RegionSize + dd + (int)(Constants.RegionSize/2);
-                int endY = (int)pRegionLocY * (int)Constants.RegionSize + dd + (int)(Constants.RegionSize/2);
+                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);
+                    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;
@@ -2190,10 +2345,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 List<GridRegion> 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; });
 
@@ -2256,10 +2409,13 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         /// Move the given scene object into a new region depending on which region its absolute position has moved
         /// into.
         ///
-        /// This method locates the new region handle and offsets the prim position for the new region
+        /// Using the objects new world location, ask the grid service for a the new region and adjust the prim
+        /// position to be relative to 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)
@@ -2285,208 +2441,49 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 return;
             }
 
-            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));
-
+            // Remember the old group position in case the region lookup fails so position can be restored.
+            Vector3 oldGroupPosition = grp.RootPart.GroupPosition;
 
-                    Border crossedBordery = scene.GetCrossedBorder(attemptedPosition + SouthCross, Cardinals.S);
-                    //(crossedBorderx.BorderLine.Z / (int)Constants.RegionSize)
+            // Compute the absolute position of the object.
+            double objectWorldLocX = (double)scene.RegionInfo.WorldLocX + attemptedPosition.X;
+            double objectWorldLocY = (double)scene.RegionInfo.WorldLocY + attemptedPosition.Y;
 
-                    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));
+            // 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 + changeY) * Constants.RegionSize));
-                    // x - 1
-                    // y + 1
-                }
-                else
-                {
-                    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));
-
-                    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/Framework/EntityTransfer/EntityTransferStateMachine.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferStateMachine.cs
index fc02916..6a04acf 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferStateMachine.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferStateMachine.cs
@@ -77,6 +77,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
     public class EntityTransferStateMachine
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly string LogHeader = "[ENTITY TRANSFER STATE MACHINE]";
 
         /// <summary>
         /// If true then on a teleport, the source region waits for a callback from the destination region.  If
@@ -100,6 +101,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         /// <returns>true if the agent was not already in transit, false if it was</returns>
         internal bool SetInTransit(UUID id)
         {
+            m_log.DebugFormat("{0} SetInTransit. agent={1}, newState=Preparing", LogHeader, id);
             lock (m_agentsInTransit)
             {
                 if (!m_agentsInTransit.ContainsKey(id))
@@ -121,6 +123,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         /// <exception cref='Exception'>Illegal transitions will throw an Exception</exception>
         internal bool UpdateInTransit(UUID id, AgentTransferState newState)
         {
+            m_log.DebugFormat("{0} UpdateInTransit. agent={1}, newState={2}", LogHeader, id, newState);
+
             bool transitionOkay = false;
 
             // We don't want to throw an exception on cancel since this can come it at any time.
@@ -193,6 +197,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 }
                 else if (failIfNotOkay)
                 {
+                    m_log.DebugFormat("{0} UpdateInTransit. Throwing transition failure = {1}", LogHeader, failureMessage);
                     throw new Exception(failureMessage);
                 }
 //                else
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..277293a 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
@@ -192,8 +192,12 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
             return m_GridService.GetRegionByUUID(scopeID, regionID);
         }
 
+        // Get a region given its base coordinates.
+        // NOTE: this is NOT 'get a region by some point in the region'. The coordinate MUST
+        //     be the base coordinate of the region.
         public GridRegion GetRegionByPosition(UUID scopeID, int x, int y)
         {
+            m_log.DebugFormat("{0} GetRegionByPosition. pos=<{1},{2}>", "[LOCAL GRID SERVICE CONNECTOR", x, y);
             GridRegion region = null;
 
             // First see if it's a neighbour, even if it isn't on this sim.
@@ -206,6 +210,8 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
                     region = rcache.GetRegionByPosition(x, y);
                     if (region != null)
                     {
+                        m_log.DebugFormat("{0} GetRegionByPosition. Found region {1}. Pos=<{2},{3}>",
+                                        "[LOCAL GRID SERVICE CONNECTOR", region.RegionName, x, y);
                         return region;
                     }
                 }
@@ -268,7 +274,7 @@ 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));
                 }
             }
 
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/RemoteGridServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RemoteGridServiceConnector.cs
index 6a57d1f..ae5081c 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RemoteGridServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RemoteGridServiceConnector.cs
@@ -186,10 +186,14 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
             return rinfo;
         }
 
+        // Get a region given its base world 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 coordinates are world coords (meters), NOT region units.
         public GridRegion GetRegionByPosition(UUID scopeID, int x, int y)
         {
             bool inCache = false;
-            GridRegion rinfo = m_RegionInfoCache.Get(scopeID, Util.UIntsToLong((uint)x, (uint)y), out inCache);
+            GridRegion rinfo = m_RegionInfoCache.Get(scopeID, Util.RegionWorldLocToHandle((uint)x, (uint)y), out inCache);
             if (inCache)
                 return rinfo;
 
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/Tests/GridConnectorsTests.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/Tests/GridConnectorsTests.cs
index 4338133..25ae689 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/Tests/GridConnectorsTests.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/Tests/GridConnectorsTests.cs
@@ -34,6 +34,7 @@ using log4net.Config;
 using Nini.Config;
 using NUnit.Framework;
 using OpenMetaverse;
+
 using OpenSim.Framework;
 using OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid;
 using OpenSim.Region.Framework.Scenes;
@@ -141,7 +142,7 @@ 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");
 
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Neighbour/LocalNeighbourServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Neighbour/LocalNeighbourServiceConnector.cs
index fd89428..56d9937 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Neighbour/LocalNeighbourServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Neighbour/LocalNeighbourServiceConnector.cs
@@ -132,7 +132,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Neighbour
                 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, Util.WorldToRegionLoc(x), Util.WorldToRegionLoc(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 a990898..9f39aa2 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 73c4d6c..99db7ff 100644
--- a/OpenSim/Region/CoreModules/World/Land/LandManagementModule.cs
+++ b/OpenSim/Region/CoreModules/World/Land/LandManagementModule.cs
@@ -64,6 +64,7 @@ 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]";
 
         private static readonly string remoteParcelRequestPath = "0009/";
 
@@ -74,15 +75,11 @@ 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;
+        private const int landUnit = 4;
 
         /// <value>
         /// Land objects keyed by local id
@@ -115,6 +112,8 @@ namespace OpenSim.Region.CoreModules.World.Land
         public void AddRegion(Scene scene)
         {
             m_scene = scene;
+            m_landIDList = new int[m_scene.RegionInfo.RegionSizeX / landUnit, m_scene.RegionInfo.RegionSizeY / landUnit];
+
             m_landIDList.Initialize();
             landChannel = new LandChannel(scene, this);
 
@@ -297,6 +296,7 @@ namespace OpenSim.Region.CoreModules.World.Land
             {
                 m_landList.Clear();
                 m_lastLandLocalID = LandChannel.START_LAND_LOCAL_ID - 1;
+                m_landIDList = new int[m_scene.RegionInfo.RegionSizeX / landUnit, m_scene.RegionInfo.RegionSizeY / landUnit];
                 m_landIDList.Initialize();
             }
         }
@@ -311,7 +311,8 @@ namespace OpenSim.Region.CoreModules.World.Land
                 "[LAND MANAGEMENT MODULE]: Creating default parcel for region {0}", 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();
             
@@ -438,8 +439,8 @@ namespace OpenSim.Region.CoreModules.World.Land
 
         public void SendLandUpdate(ScenePresence avatar, bool force)
         {
-            ILandObject over = GetLandObject((int)Math.Min(((int)Constants.RegionSize - 1), Math.Max(0, Math.Round(avatar.AbsolutePosition.X))),
-                                             (int)Math.Min(((int)Constants.RegionSize - 1), Math.Max(0, Math.Round(avatar.AbsolutePosition.Y))));
+            ILandObject over = GetLandObject((int)Math.Min(((int)m_scene.RegionInfo.RegionSizeX - 1), Math.Max(0, Math.Round(avatar.AbsolutePosition.X))),
+                                             (int)Math.Min(((int)m_scene.RegionInfo.RegionSizeY - 1), Math.Max(0, Math.Round(avatar.AbsolutePosition.Y))));
 
             if (over != null)
             {
@@ -605,17 +606,29 @@ namespace OpenSim.Region.CoreModules.World.Land
                 new_land.LandData.LocalID = newLandLocalID;
 
                 bool[,] landBitmap = new_land.GetLandBitmap();
-                for (int x = 0; x < landArrayMax; x++)
+                // m_log.DebugFormat("{0} AddLandObject. new_land.bitmapSize=({1},{2}). newLocalID={3}",
+                //                 LogHeader, landBitmap.GetLength(0), landBitmap.GetLength(1), newLandLocalID);
+
+                if (landBitmap.GetLength(0) != m_landIDList.GetLength(0) || landBitmap.GetLength(1) != m_landIDList.GetLength(1))
                 {
-                    for (int y = 0; y < landArrayMax; y++)
+                    // Going to variable sized regions can cause mismatches
+                    m_log.ErrorFormat("{0} AddLandObject. Added land bitmap different size than region ID map. bitmapSize=({1},{2}), landIDSize=({3},{4})",
+                        LogHeader, landBitmap.GetLength(0), landBitmap.GetLength(1), m_landIDList.GetLength(0), m_landIDList.GetLength(1) );
+                }
+                else
+                {
+                    for (int x = 0; x < landBitmap.GetLength(0); x++)
                     {
-                        if (landBitmap[x, y])
+                        for (int y = 0; y < landBitmap.GetLength(1); y++)
                         {
-//                            m_log.DebugFormat(
-//                                "[LAND MANAGEMENT MODULE]: Registering parcel {0} for land co-ord ({1}, {2}) on {3}", 
-//                                new_land.LandData.Name, x, y, m_scene.RegionInfo.RegionName);
-                            
-                            m_landIDList[x, y] = newLandLocalID;
+                            if (landBitmap[x, y])
+                            {
+                                // m_log.DebugFormat(
+                                //     "[LAND MANAGEMENT MODULE]: Registering parcel {0} for land co-ord ({1}, {2}) on {3}", 
+                                //     new_land.LandData.Name, x, y, m_scene.RegionInfo.RegionName);
+
+                                m_landIDList[x, y] = newLandLocalID;
+                            }
                         }
                     }
                 }
@@ -637,9 +650,9 @@ 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)
                         {
@@ -691,9 +704,9 @@ 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])
                         {
@@ -727,23 +740,28 @@ namespace OpenSim.Region.CoreModules.World.Land
         /// <returns>Land object at the point supplied</returns>
         public ILandObject GetLandObject(float x_float, float y_float)
         {
+            return GetLandObject((int)x_float, (int)y_float, true /* returnNullIfLandObjectNotFound */);
+            /*
             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;
             }
@@ -759,38 +777,122 @@ namespace OpenSim.Region.CoreModules.World.Land
 //                    m_log.DebugFormat(
 //                        "[LAND MANAGEMENT MODULE]: No land object found at ({0}, {1}) on {2}", 
 //                        x, y, m_scene.RegionInfo.RegionName);
-                
-                if (m_landList.ContainsKey(m_landIDList[x, y]))
-                    return m_landList[m_landIDList[x, y]];
+
+                try
+                {
+                    if (m_landList.ContainsKey(m_landIDList[x, y]))
+                        return m_landList[m_landIDList[x, y]];
+                }
+                catch (Exception e)
+                {
+                    m_log.DebugFormat("{0} GetLandObject exception. x={1}, y={2}, m_landIDList.len=({3},{4})",
+                        LogHeader, x, y, m_landIDList.GetLength(0), m_landIDList.GetLength(1));
+                }
                 
                 return null;
             }
+             */
         }
 
+        // Public entry.
+        // Throws exception if land object is not found
         public ILandObject GetLandObject(int x, int y)
         {
-            if (x >= Convert.ToInt32(Constants.RegionSize) || y >= Convert.ToInt32(Constants.RegionSize) || x < 0 || y < 0)
+            return GetLandObject(x, y, false /* returnNullIfLandObjectNotFound */);
+        }
+
+        // Given a region position, return the parcel land object for that location
+        private ILandObject GetLandObject(int x, int y, bool returnNullIfLandObjectNotFound)
+        {
+            ILandObject ret = null;
+
+            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
-                throw new Exception("Error: Parcel not found at point " + x + ", " + y);
+                if (returnNullIfLandObjectNotFound)
+                    return null;
+                else
+                    throw new Exception(
+                        String.Format("{0} GetLandObject for non-existant position. Region={1}, pos=<{2},{3}",
+                                                LogHeader, m_scene.RegionInfo.RegionName, x, y)
+                );
             }
 
             lock (m_landIDList)
             {
                 try
                 {
-                    return m_landList[m_landIDList[x / 4, y / 4]];
+                    int landID = m_landIDList[x / landUnit, y / landUnit];
+                    if (landID == 0)
+                    {
+                        // Zero is the uninitialized value saying there is no parcel for this location.
+                        // This sometimes happens when terrain is resized.
+                        if (m_landList.Count == 1)
+                        {
+                            int onlyParcelID = 0;
+                            ILandObject onlyLandObject = null;
+                            foreach (KeyValuePair<int, ILandObject> kvp in m_landList)
+                            {
+                                onlyParcelID = kvp.Key;
+                                onlyLandObject = kvp.Value;
+                                break;
+                            }
+
+                            // There is only one parcel. Grow it to fill all the unallocated spaces.
+                            for (int xx = 0; xx < m_landIDList.GetLength(0); xx++)
+                                for (int yy = 0; yy < m_landIDList.GetLength(1); yy++)
+                                    if (m_landIDList[xx, yy] == 0)
+                                        m_landIDList[xx, yy] = onlyParcelID;
+
+                            onlyLandObject.LandBitmap = CreateBitmapForID(onlyParcelID);
+                            landID = onlyParcelID;
+                        }
+                        else
+                        {
+                            // There are several other parcels so we must create a new one for the unassigned space
+                            ILandObject newLand = new LandObject(UUID.Zero, false, m_scene);                                                
+                            // Claim all the unclaimed "0" ids
+                            newLand.SetLandBitmap(CreateBitmapForID(0));
+                            newLand.LandData.OwnerID = m_scene.RegionInfo.EstateSettings.EstateOwner;
+                            newLand.LandData.ClaimDate = Util.UnixTimeSinceEpoch();
+                            AddLandObject(newLand);
+                            landID = m_lastLandLocalID;
+                        }
+                    }
+
+                    ret = m_landList[landID];
                 }
                 catch (IndexOutOfRangeException)
                 {
-//                    m_log.WarnFormat(
-//                        "[LAND MANAGEMENT MODULE]: Tried to retrieve land object from out of bounds co-ordinate ({0},{1}) in {2}", 
-//                        x, y, m_scene.RegionInfo.RegionName);
-                    
+                    m_log.ErrorFormat(
+                        "{0} GetLandObject: Tried to retrieve land object from out of bounds co-ordinate ({1},{2}) in {3}. landListSize=({4},{5})",
+                        LogHeader, x, y, m_scene.RegionInfo.RegionName, m_landIDList.GetLength(0), m_landIDList.GetLength(1));
+                    return null;
+                }
+                catch
+                {
+                    m_log.ErrorFormat(
+                        "{0} GetLandObject: LandID not in landlist. XY=<{1},{2}> in {3}. landID[x,y]={4}",
+                        LogHeader, x, y, m_scene.RegionInfo.RegionName, m_landIDList[x/landUnit, y/landUnit]);
                     return null;
                 }
             }
+            return ret;
+        }
+
+        // Create a 'parcel is here' bitmap for the parcel identified by the passed landID
+        private bool[,] CreateBitmapForID(int landID)
+        {
+            bool[,] ret = new bool[m_landIDList.GetLength(0), m_landIDList.GetLength(1)];
+            ret.Initialize();
+
+            for (int xx = 0; xx < m_landIDList.GetLength(0); xx++)
+                for (int yy = 0; yy < m_landIDList.GetLength(0); yy++)
+                    if (m_landIDList[xx, yy] == landID)
+                        ret[xx, yy] = true;
+
+            return ret;
         }
 
         #endregion
@@ -1053,85 +1155,93 @@ namespace OpenSim.Region.CoreModules.World.Land
             byte[] byteArray = new byte[LAND_BLOCKS_PER_PACKET];
             int byteArrayCount = 0;
             int sequenceID = 0;
-            int blockmeters = 4 * (int) Constants.RegionSize/(int)Constants.TerrainPatchSize;
-
 
-            for (int y = 0; y < blockmeters; y++)
+            // Layer data is in landUnit (4m) chunks
+            for (int y = 0; y < m_scene.RegionInfo.RegionSizeY / Constants.TerrainPatchSize * (Constants.TerrainPatchSize / landUnit); y++)
             {
-                for (int x = 0; x < blockmeters; x++)
+                for (int x = 0; x < m_scene.RegionInfo.RegionSizeX / Constants.TerrainPatchSize * (Constants.TerrainPatchSize / landUnit); x++)
                 {
-                    byte tempByte = 0; //This represents the byte for the current 4x4
+                    byteArray[byteArrayCount] = BuildLayerByte(GetLandObject(x * landUnit, y * landUnit), x, y, remote_client);
+                    byteArrayCount++;
+                    if (byteArrayCount >= LAND_BLOCKS_PER_PACKET)
+                    {
+                        remote_client.SendLandParcelOverlay(byteArray, sequenceID);
+                        byteArrayCount = 0;
+                        sequenceID++;
+                        byteArray = new byte[LAND_BLOCKS_PER_PACKET];
+                    }
 
-                    ILandObject currentParcelBlock = GetLandObject(x * 4, y * 4);
+                }
+            }
+            if (byteArrayCount != 0)
+            {
+                remote_client.SendLandParcelOverlay(byteArray, sequenceID);
+            }
+        }
 
-                    if (currentParcelBlock != null)
-                    {
-                        if (currentParcelBlock.LandData.OwnerID == remote_client.AgentId)
-                        {
-                            //Owner Flag
-                            tempByte = Convert.ToByte(tempByte | LandChannel.LAND_TYPE_OWNED_BY_REQUESTER);
-                        }
-                        else if (currentParcelBlock.LandData.SalePrice > 0 &&
-                                 (currentParcelBlock.LandData.AuthBuyerID == UUID.Zero ||
-                                  currentParcelBlock.LandData.AuthBuyerID == remote_client.AgentId))
-                        {
-                            //Sale Flag
-                            tempByte = Convert.ToByte(tempByte | LandChannel.LAND_TYPE_IS_FOR_SALE);
-                        }
-                        else if (currentParcelBlock.LandData.OwnerID == UUID.Zero)
-                        {
-                            //Public Flag
-                            tempByte = Convert.ToByte(tempByte | LandChannel.LAND_TYPE_PUBLIC);
-                        }
-                        else
-                        {
-                            //Other Flag
-                            tempByte = Convert.ToByte(tempByte | LandChannel.LAND_TYPE_OWNED_BY_OTHER);
-                        }
+        private byte BuildLayerByte(ILandObject currentParcelBlock, int x, int y, IClientAPI remote_client)
+        {
+            byte tempByte = 0; //This represents the byte for the current 4x4
 
-                        //Now for border control
+            if (currentParcelBlock != null)
+            {
+                if (currentParcelBlock.LandData.OwnerID == remote_client.AgentId)
+                {
+                    //Owner Flag
+                    tempByte = Convert.ToByte(tempByte | LandChannel.LAND_TYPE_OWNED_BY_REQUESTER);
+                }
+                else if (currentParcelBlock.LandData.SalePrice > 0 &&
+                         (currentParcelBlock.LandData.AuthBuyerID == UUID.Zero ||
+                          currentParcelBlock.LandData.AuthBuyerID == remote_client.AgentId))
+                {
+                    //Sale Flag
+                    tempByte = Convert.ToByte(tempByte | LandChannel.LAND_TYPE_IS_FOR_SALE);
+                }
+                else if (currentParcelBlock.LandData.OwnerID == UUID.Zero)
+                {
+                    //Public Flag
+                    tempByte = Convert.ToByte(tempByte | LandChannel.LAND_TYPE_PUBLIC);
+                }
+                else
+                {
+                    //Other Flag
+                    tempByte = Convert.ToByte(tempByte | LandChannel.LAND_TYPE_OWNED_BY_OTHER);
+                }
 
-                        ILandObject westParcel = null;
-                        ILandObject southParcel = null;
-                        if (x > 0)
-                        {
-                            westParcel = GetLandObject((x - 1) * 4, y * 4);
-                        }
-                        if (y > 0)
-                        {
-                            southParcel = GetLandObject(x * 4, (y - 1) * 4);
-                        }
+                //Now for border control
 
-                        if (x == 0)
-                        {
-                            tempByte = Convert.ToByte(tempByte | LandChannel.LAND_FLAG_PROPERTY_BORDER_WEST);
-                        }
-                        else if (westParcel != null && westParcel != currentParcelBlock)
-                        {
-                            tempByte = Convert.ToByte(tempByte | LandChannel.LAND_FLAG_PROPERTY_BORDER_WEST);
-                        }
+                ILandObject westParcel = null;
+                ILandObject southParcel = null;
+                if (x > 0)
+                {
+                    westParcel = GetLandObject((x - 1) * landUnit, y * landUnit);
+                }
+                if (y > 0)
+                {
+                    southParcel = GetLandObject(x * landUnit, (y - 1) * landUnit);
+                }
 
-                        if (y == 0)
-                        {
-                            tempByte = Convert.ToByte(tempByte | LandChannel.LAND_FLAG_PROPERTY_BORDER_SOUTH);
-                        }
-                        else if (southParcel != null && southParcel != currentParcelBlock)
-                        {
-                            tempByte = Convert.ToByte(tempByte | LandChannel.LAND_FLAG_PROPERTY_BORDER_SOUTH);
-                        }
+                if (x == 0)
+                {
+                    tempByte = Convert.ToByte(tempByte | LandChannel.LAND_FLAG_PROPERTY_BORDER_WEST);
+                }
+                else if (westParcel != null && westParcel != currentParcelBlock)
+                {
+                    tempByte = Convert.ToByte(tempByte | LandChannel.LAND_FLAG_PROPERTY_BORDER_WEST);
+                }
 
-                        byteArray[byteArrayCount] = tempByte;
-                        byteArrayCount++;
-                        if (byteArrayCount >= LAND_BLOCKS_PER_PACKET)
-                        {
-                            remote_client.SendLandParcelOverlay(byteArray, sequenceID);
-                            byteArrayCount = 0;
-                            sequenceID++;
-                            byteArray = new byte[LAND_BLOCKS_PER_PACKET];
-                        }
-                    }
+                if (y == 0)
+                {
+                    tempByte = Convert.ToByte(tempByte | LandChannel.LAND_FLAG_PROPERTY_BORDER_SOUTH);
+                }
+                else if (southParcel != null && southParcel != currentParcelBlock)
+                {
+                    tempByte = Convert.ToByte(tempByte | LandChannel.LAND_FLAG_PROPERTY_BORDER_SOUTH);
                 }
+
             }
+
+            return tempByte;
         }
 
         public void ClientOnParcelPropertiesRequest(int start_x, int start_y, int end_x, int end_y, int sequence_id,
@@ -1679,7 +1789,7 @@ 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.
@@ -2007,4 +2117,4 @@ namespace OpenSim.Region.CoreModules.World.Land
             cdl.AddToStringBuilder(report);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/CoreModules/World/Land/LandObject.cs b/OpenSim/Region/CoreModules/World/Land/LandObject.cs
index e54c849..f8f4986 100644
--- a/OpenSim/Region/CoreModules/World/Land/LandObject.cs
+++ b/OpenSim/Region/CoreModules/World/Land/LandObject.cs
@@ -45,10 +45,10 @@ 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 bool[,] m_landBitmap;
+        private readonly int landUnit = 4;
 
         private int m_lastSeqId = 0;
 
@@ -93,15 +93,17 @@ 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);
                     }
                 }
 
+                m_log.ErrorFormat("{0} StartPoint. No start point found. bitmapSize=<{1},{2}>",
+                                    LogHeader, LandBitmap.GetLength(0), LandBitmap.GetLength(1));
                 return new Vector3(-1, -1, -1);
             }
         }
@@ -110,17 +112,19 @@ 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);
                         }
                     }
                 }
 
+                m_log.ErrorFormat("{0} EndPoint. No end point found. bitmapSize=<{1},{2}>",
+                                    LogHeader, LandBitmap.GetLength(0), LandBitmap.GetLength(1));
                 return new Vector3(-1, -1, -1);
             }
         }
@@ -130,6 +134,8 @@ namespace OpenSim.Region.CoreModules.World.Land
         public LandObject(UUID owner_id, bool is_group_owned, Scene scene)
         {
             m_scene = scene;
+            m_landBitmap = new bool[m_scene.RegionInfo.RegionSizeX / landUnit, m_scene.RegionInfo.RegionSizeY / landUnit];
+
             LandData.OwnerID = owner_id;
             if (is_group_owned)
                 LandData.GroupID = owner_id;
@@ -152,9 +158,9 @@ 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] == true);
             }
             else
             {
@@ -194,7 +200,7 @@ namespace OpenSim.Region.CoreModules.World.Land
             else
             {
                 // Normal Calculations
-                int parcelMax = (int)(((float)LandData.Area / 65536.0f)
+                int parcelMax = (int)(((float)LandData.Area / (m_scene.RegionInfo.RegionSizeX * m_scene.RegionInfo.RegionSizeY))
                               * (float)m_scene.RegionInfo.ObjectCapacity
                               * (float)m_scene.RegionInfo.RegionSettings.ObjectBonus);
                 // TODO: The calculation of ObjectBonus should be refactored. It does still not work in the same manner as SL!
@@ -211,7 +217,7 @@ namespace OpenSim.Region.CoreModules.World.Land
             else
             {
                 //Normal Calculations
-                int simMax = (int)(((float)LandData.SimwideArea / 65536.0f)
+                int simMax = (int)(((float)LandData.SimwideArea / (m_scene.RegionInfo.RegionSizeX * m_scene.RegionInfo.RegionSizeY))
                            * (float)m_scene.RegionInfo.ObjectCapacity);
                 return simMax;
             }
@@ -224,7 +230,12 @@ namespace OpenSim.Region.CoreModules.World.Land
         public void SendLandProperties(int sequence_id, bool snap_selection, int request_result, IClientAPI remote_client)
         {
             IEstateModule estateModule = m_scene.RequestModuleInterface<IEstateModule>();
-            uint regionFlags = 336723974 & ~((uint)(RegionFlags.AllowLandmark | RegionFlags.AllowSetHome));
+            // uint regionFlags = 336723974 & ~((uint)(RegionFlags.AllowLandmark | RegionFlags.AllowSetHome));
+            uint regionFlags = (uint)(RegionFlags.PublicAllowed
+                                    | RegionFlags.AllowDirectTeleport
+                                    | RegionFlags.AllowParcelChanges
+                                    | RegionFlags.AllowVoice );
+
             if (estateModule != null)
                 regionFlags = estateModule.GetRegionFlags();
 
@@ -559,8 +570,8 @@ 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)
                 {
@@ -707,15 +718,15 @@ namespace OpenSim.Region.CoreModules.World.Land
         /// </summary>
         private void UpdateAABBAndAreaValues()
         {
-            int min_x = 64;
-            int min_y = 64;
+            int min_x = 10000;
+            int min_y = 10000;
             int max_x = 0;
             int max_y = 0;
             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)
                     {
@@ -723,31 +734,31 @@ namespace OpenSim.Region.CoreModules.World.Land
                         if (min_y > y) min_y = y;
                         if (max_x < x) 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 * 4;
-            if (tx > ((int)Constants.RegionSize - 1))
-                tx = ((int)Constants.RegionSize - 1);
-            int ty = min_y * 4;
-            if (ty > ((int)Constants.RegionSize - 1))
-                ty = ((int)Constants.RegionSize - 1);
+            int tx = min_x * landUnit;
+            if (tx > ((int)m_scene.RegionInfo.RegionSizeX - 1))
+                tx = ((int)m_scene.RegionInfo.RegionSizeX - 1);
+            int ty = min_y * landUnit;
+            if (ty > ((int)m_scene.RegionInfo.RegionSizeY - 1))
+                ty = ((int)m_scene.RegionInfo.RegionSizeY - 1);
 
             LandData.AABBMin =
                 new Vector3(
-                    (float)(min_x * 4), (float)(min_y * 4), m_scene != null ? (float)m_scene.Heightmap[tx, ty] : 0);
+                    (float)(min_x * landUnit), (float)(min_y * landUnit), m_scene != null ? (float)m_scene.Heightmap[tx, ty] : 0);
 
-            tx = max_x * 4;
-            if (tx > ((int)Constants.RegionSize - 1))
-                tx = ((int)Constants.RegionSize - 1);
-            ty = max_y * 4;
-            if (ty > ((int)Constants.RegionSize - 1))
-                ty = ((int)Constants.RegionSize - 1);
+            tx = max_x * landUnit;
+            if (tx > ((int)m_scene.RegionInfo.RegionSizeX - 1))
+                tx = ((int)m_scene.RegionInfo.RegionSizeX - 1);
+            ty = max_y * landUnit;
+            if (ty > ((int)m_scene.RegionInfo.RegionSizeY - 1))
+                ty = ((int)m_scene.RegionInfo.RegionSizeY - 1);
 
             LandData.AABBMax 
                 = new Vector3(
-                    (float)(max_x * 4), (float)(max_y * 4), m_scene != null ? (float)m_scene.Heightmap[tx, ty] : 0);
+                    (float)(max_x * landUnit), (float)(max_y * landUnit), m_scene != null ? (float)m_scene.Heightmap[tx, ty] : 0);
 
             LandData.Area = tempArea;
         }
@@ -759,20 +770,12 @@ 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;
+            // m_log.DebugFormat("{0} SetLandBitmap. BitmapSize=<{1},{2}>", LogHeader, LandBitmap.GetLength(0), LandBitmap.GetLength(1));
+            ForceUpdateLandInfo();
         }
 
         /// <summary>
@@ -786,15 +789,19 @@ 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);
+            // m_log.DebugFormat("{0} GetSquareLandBitmap. tempBitmapSize=<{1},{2}>",
+            //                         LogHeader, tempBitmap.GetLength(0), tempBitmap.GetLength(1));
             return tempBitmap;
         }
 
@@ -811,24 +818,20 @@ 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;
                     }
                 }
             }
+            // m_log.DebugFormat("{0} ModifyLandBitmapSquare. startXY=<{1},{2}>, endXY=<{3},{4}>, val={5}, landBitmapSize=<{6},{7}>",
+            //                         LogHeader, start_x, start_y, end_x, end_y, set_value, land_bitmap.GetLength(0), land_bitmap.GetLength(1));
             return land_bitmap;
         }
 
@@ -840,21 +843,21 @@ 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)
+            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_base in mergeLandBitmaps");
-            }
-            if (bitmap_add.GetLength(0) != 64 || bitmap_add.GetLength(1) != 64 || bitmap_add.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])
                     {
@@ -871,13 +874,13 @@ 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];
             byte tempByte = 0;
-            int x, y, i, byteNum = 0;
-            i = 0;
-            for (y = 0; y < 64; y++)
+            int byteNum = 0;
+            int i = 0;
+            for (int y = 0; y < LandBitmap.GetLength(1); y++)
             {
-                for (x = 0; x < 64; x++)
+                for (int x = 0; x < LandBitmap.GetLength(0); x++)
                 {
                     tempByte = Convert.ToByte(tempByte | Convert.ToByte(LandBitmap[x, y]) << (i++ % 8));
                     if (i % 8 == 0)
@@ -889,30 +892,52 @@ namespace OpenSim.Region.CoreModules.World.Land
                     }
                 }
             }
+            // m_log.DebugFormat("{0} ConvertLandBitmapToBytes. BitmapSize=<{1},{2}>",
+            //                         LogHeader, LandBitmap.GetLength(0), LandBitmap.GetLength(1));
             return tempConvertArr;
         }
 
         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 e)
+                    {
+                        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 40638f8..1007e0b 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);
@@ -273,7 +274,7 @@ 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();
@@ -356,7 +357,7 @@ 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
@@ -399,9 +400,14 @@ 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
@@ -523,11 +529,11 @@ 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;
@@ -595,17 +601,17 @@ 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 992bff3..9b939c9 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("[MAPTILE]: 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);
                         }
                     }
                 }
diff --git a/OpenSim/Region/CoreModules/World/LegacyMap/TexturedMapTileRenderer.cs b/OpenSim/Region/CoreModules/World/LegacyMap/TexturedMapTileRenderer.cs
index d13c2ef..413ac64 100644
--- a/OpenSim/Region/CoreModules/World/LegacyMap/TexturedMapTileRenderer.cs
+++ b/OpenSim/Region/CoreModules/World/LegacyMap/TexturedMapTileRenderer.cs
@@ -34,6 +34,8 @@ using Nini.Config;
 using OpenMetaverse;
 using OpenMetaverse.Imaging;
 using OpenSim.Framework;
+using OpenSim.Region.Framework;
+using OpenSim.Region.Framework.Interfaces;
 using OpenSim.Region.Framework.Scenes;
 
 namespace OpenSim.Region.CoreModules.World.LegacyMap
@@ -122,8 +124,8 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
     {
         #region Constants
 
-        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 = "[TEXTURED MAPTILE RENDERER]";
 
         // some hardcoded terrain UUIDs that work with SL 1.20 (the four default textures and "Blank").
         // The color-values were choosen because they "look right" (at least to me) ;-)
@@ -173,7 +175,7 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
         private Bitmap fetchTexture(UUID id)
         {
             AssetBase asset = m_scene.AssetService.Get(id.ToString());
-            m_log.DebugFormat("[TexturedMapTileRenderer]: Fetched texture {0}, found: {1}", id, asset != null);
+            m_log.DebugFormat("{0} Fetched texture {1}, found: {2}", LogHeader, id, asset != null);
             if (asset == null) return null;
 
             ManagedImage managedImage;
@@ -188,18 +190,15 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
             }
             catch (DllNotFoundException)
             {
-                m_log.ErrorFormat("[TexturedMapTileRenderer]: OpenJpeg is not installed correctly on this system.   Asset Data is empty for {0}", id);
-                
+                m_log.ErrorFormat("{0} OpenJpeg is not installed correctly on this system.   Asset Data is empty for {1}", LogHeader, id);
             }
             catch (IndexOutOfRangeException)
             {
-                m_log.ErrorFormat("[TexturedMapTileRenderer]: OpenJpeg was unable to encode this.   Asset Data is empty for {0}", id);
-                
+                m_log.ErrorFormat("{0} OpenJpeg was unable to encode this.   Asset Data is empty for {1}", LogHeader, id);
             }
             catch (Exception)
             {
-                m_log.ErrorFormat("[TexturedMapTileRenderer]: OpenJpeg was unable to encode this.   Asset Data is empty for {0}", id);
-                
+                m_log.ErrorFormat("{0} OpenJpeg was unable to encode this.   Asset Data is empty for {1}", LogHeader, id);
             }
             return null;
             
@@ -267,8 +266,8 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
 
         // the heigthfield might have some jumps in values. Rendered land is smooth, though,
         // as a slope is rendered at that place. So average 4 neighbour values to emulate that.
-        private float getHeight(double[,] hm, int x, int y) {
-            if (x < ((int)Constants.RegionSize - 1) && y < ((int)Constants.RegionSize - 1))
+        private float getHeight(ITerrainChannel hm, int x, int y) {
+            if (x < (hm.Width - 1) && y < (hm.Height - 1))
                 return (float)(hm[x, y] * .444 + (hm[x + 1, y] + hm[x, y + 1]) * .222 + hm[x + 1, y +1] * .112);
             else
                 return (float)hm[x, y];
@@ -278,7 +277,15 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
         public void TerrainToBitmap(Bitmap mapbmp)
         {
             int tc = Environment.TickCount;
-            m_log.Debug("[MAPTILE]: Generating Maptile Step 1: Terrain");
+            m_log.DebugFormat("{0} Generating Maptile Step 1: Terrain", LogHeader);
+
+            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);
+            }
 
             // These textures should be in the AssetCache anyway, as every client conneting to this
             // region needs them. Except on start, when the map is recreated (before anyone connected),
@@ -306,19 +313,17 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
 
             float waterHeight = (float)settings.WaterHeight;
 
-            double[,] hm = m_scene.Heightmap.GetDoubles();
-
-            for (int x = 0; x < (int)Constants.RegionSize; x++)
+            for (int x = 0; x < hm.Width; x++)
             {
-                float columnRatio = x / ((float)Constants.RegionSize - 1); // 0 - 1, for interpolation
-                for (int y = 0; y < (int)Constants.RegionSize; y++)
+                float columnRatio = x / (hm.Width - 1); // 0 - 1, for interpolation
+                for (int y = 0; y < hm.Height; y++)
                 {
-                    float rowRatio = y / ((float)Constants.RegionSize - 1); // 0 - 1, for interpolation
+                    float rowRatio = y / (hm.Height - 1); // 0 - 1, for interpolation
 
                     // 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 = (hm.Height - 1) - y;
 
-                    float heightvalue = getHeight(hm, x, y);
+                    float heightvalue = getHeight(m_scene.Heightmap, x, y);
                     if (Single.IsInfinity(heightvalue) || Single.IsNaN(heightvalue))
                         heightvalue = 0;
 
@@ -368,9 +373,9 @@ namespace OpenSim.Region.CoreModules.World.LegacyMap
                         }
 
                         // Shade the terrain for shadows
-                        if (x < ((int)Constants.RegionSize - 1) && y < ((int)Constants.RegionSize - 1))
+                        if (x < (hm.Width - 1) && y < (hm.Height - 1))
                         {
-                            float hfvaluecompare = getHeight(hm, x + 1, y + 1); // light from north-east => look at land height there
+                            float hfvaluecompare = getHeight(m_scene.Heightmap, x + 1, y + 1); // light from north-east => look at land height there
                             if (Single.IsInfinity(hfvaluecompare) || Single.IsNaN(hfvaluecompare))
                                 hfvaluecompare = 0f;
 
diff --git a/OpenSim/Region/CoreModules/World/Objects/BuySell/BuySellModule.cs b/OpenSim/Region/CoreModules/World/Objects/BuySell/BuySellModule.cs
index 0cb574a..b8d4855 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 f8e93e1..45617fc 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..89087b1 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;
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/FloodBrushes/NoiseArea.cs b/OpenSim/Region/CoreModules/World/Terrain/FloodBrushes/NoiseArea.cs
index 630473e..b6c635c 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;
                     }
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 fd30c46..9766bfe 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
@@ -30,10 +30,14 @@ using System.Collections.Generic;
 using System.IO;
 using System.Reflection;
 using System.Net;
+
 using log4net;
 using Nini.Config;
+
 using OpenMetaverse;
 using Mono.Addins;
+
+using OpenSim.Data;
 using OpenSim.Framework;
 using OpenSim.Region.CoreModules.Framework.InterfaceCommander;
 using OpenSim.Region.CoreModules.World.Terrain.FileLoaders;
@@ -70,6 +74,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         #endregion
 
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly string LogHeader = "[TERRAIN MODULE]";
         
         private readonly Commander m_commander = new Commander("terrain");
 
@@ -130,15 +135,15 @@ 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();
                 }
 
@@ -230,11 +235,11 @@ 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;
@@ -532,6 +537,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         /// </summary>
         public void UpdateRevertMap()
         {
+            /*
             int x;
             for (x = 0; x < m_channel.Width; x++)
             {
@@ -541,6 +547,8 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                     m_revert[x, y] = m_channel[x, y];
                 }
             }
+             */
+            m_revert = m_channel.MakeCopy();
         }
 
         /// <summary>
@@ -567,8 +575,8 @@ 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 +623,8 @@ 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}",
@@ -705,7 +713,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         private void CheckForTerrainUpdates(bool respectEstateSettings)
         {
             bool shouldTaint = false;
-            float[] serialised = m_channel.GetFloatsSerialised();
+            float[] terrHeights = m_channel.GetFloatsSerialised();
             int x;
             for (x = 0; x < m_channel.Width; x += Constants.TerrainPatchSize)
             {
@@ -714,16 +722,17 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                 {
                     if (m_channel.Tainted(x, y))
                     {
-                        // if we should respect the estate settings then
-                        // fixup and height deltas that don't respect them
+                        // 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.
                         if (respectEstateSettings && LimitChannelChanges(x, y))
                         {
-                            // this has been vetoed, so update
-                            // what we are going to send to the client
-                            serialised = m_channel.GetFloatsSerialised();
+                            // Terrain heights were modified. Refetch the terrain info.
+                            terrHeights = m_channel.GetFloatsSerialised();
                         }
 
-                        SendToClients(serialised, x, y);
+                        // m_log.DebugFormat("{0} Patch modified. Sending (x,y) = ({1},{2})", LogHeader, x, y);
+                        SendToClients(terrHeights, x, y);
                         shouldTaint = true;
                     }
                 }
@@ -792,13 +801,11 @@ 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(float[] heightMap, int x, int y)
         {
             m_scene.ForEachClient(
                 delegate(IClientAPI controller)
-                    { controller.SendLayerData(
-                        x / Constants.TerrainPatchSize, y / Constants.TerrainPatchSize, serialised);
-                    }
+                    { controller.SendLayerData( x / Constants.TerrainPatchSize, y / Constants.TerrainPatchSize, heightMap); }
             );
         }
 
@@ -984,28 +991,28 @@ 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;
 
                     }
                 }
diff --git a/OpenSim/Region/CoreModules/World/Warp3DMap/Warp3DImageModule.cs b/OpenSim/Region/CoreModules/World/Warp3DMap/Warp3DImageModule.cs
index ed2b06a..6d9e31b 100644
--- a/OpenSim/Region/CoreModules/World/Warp3DMap/Warp3DImageModule.cs
+++ b/OpenSim/Region/CoreModules/World/Warp3DMap/Warp3DImageModule.cs
@@ -128,7 +128,9 @@ namespace OpenSim.Region.CoreModules.World.Warp3DMap
         public Bitmap CreateMapTile()
         {
             Vector3 camPos = new Vector3(127.5f, 127.5f, 221.7025033688163f);
-            Viewport viewport = new Viewport(camPos, -Vector3.UnitZ, 1024f, 0.1f, (int)Constants.RegionSize, (int)Constants.RegionSize, (float)Constants.RegionSize, (float)Constants.RegionSize);
+            Viewport viewport = new Viewport(camPos, -Vector3.UnitZ, 1024f, 0.1f,
+                        (int)Constants.RegionSize, (int)Constants.RegionSize,
+                        (float)Constants.RegionSize, (float)Constants.RegionSize);
             return CreateMapTile(viewport, false);
         }
 
diff --git a/OpenSim/Region/CoreModules/World/WorldMap/MapSearchModule.cs b/OpenSim/Region/CoreModules/World/WorldMap/MapSearchModule.cs
index 708a9a2..1fb1aba 100644
--- a/OpenSim/Region/CoreModules/World/WorldMap/MapSearchModule.cs
+++ b/OpenSim/Region/CoreModules/World/WorldMap/MapSearchModule.cs
@@ -184,8 +184,8 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
                         data.Name = info.RegionName;
                     data.RegionFlags = 0; // TODO not used?
                     data.WaterHeight = 0; // not used
-                    data.X = (ushort)(info.RegionLocX / Constants.RegionSize);
-                    data.Y = (ushort)(info.RegionLocY / Constants.RegionSize);
+                    data.X = (ushort)Util.WorldToRegionLoc((uint)info.RegionLocX);
+                    data.Y = (ushort)Util.WorldToRegionLoc((uint)info.RegionLocY);
                     blocks.Add(data);
                 }
             }
diff --git a/OpenSim/Region/CoreModules/World/WorldMap/WorldMapModule.cs b/OpenSim/Region/CoreModules/World/WorldMap/WorldMapModule.cs
index cdf1467..4badb12 100644
--- a/OpenSim/Region/CoreModules/World/WorldMap/WorldMapModule.cs
+++ b/OpenSim/Region/CoreModules/World/WorldMap/WorldMapModule.cs
@@ -277,11 +277,12 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
                     {
                         List<MapBlockData> mapBlocks = new List<MapBlockData>(); ;
 
+                        // Get regions that are within 8 regions of here
                         List<GridRegion> regions = m_scene.GridService.GetRegionRange(m_scene.RegionInfo.ScopeID,
-                            (int)(m_scene.RegionInfo.RegionLocX - 8) * (int)Constants.RegionSize,
-                            (int)(m_scene.RegionInfo.RegionLocX + 8) * (int)Constants.RegionSize,
-                            (int)(m_scene.RegionInfo.RegionLocY - 8) * (int)Constants.RegionSize,
-                            (int)(m_scene.RegionInfo.RegionLocY + 8) * (int)Constants.RegionSize);
+                                    (int)Util.RegionToWorldLoc(m_scene.RegionInfo.RegionLocX - 8),
+                                    (int)Util.RegionToWorldLoc(m_scene.RegionInfo.RegionLocX + 8),
+                                    (int)Util.RegionToWorldLoc(m_scene.RegionInfo.RegionLocY - 8),
+                                    (int)Util.RegionToWorldLoc(m_scene.RegionInfo.RegionLocY + 8) );
                         foreach (GridRegion r in regions)
                         {
                             MapBlockData block = new MapBlockData();
@@ -803,7 +804,7 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
             if (httpserver.Length == 0)
             {
                 uint x = 0, y = 0;
-                Utils.LongToUInts(regionhandle, out x, out y);
+                Util.RegionHandleToWorldLoc(regionhandle, out x, out y);
                 GridRegion mreg = m_scene.GridService.GetRegionByPosition(m_scene.RegionInfo.ScopeID, (int)x, (int)y);
 
                 if (mreg != null)
@@ -1011,17 +1012,15 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
                 // on an unloaded square.
                 // But make sure: Look whether the one we requested is in there
                 List<GridRegion> regions = m_scene.GridService.GetRegionRange(m_scene.RegionInfo.ScopeID,
-                    minX * (int)Constants.RegionSize,
-                    maxX * (int)Constants.RegionSize,
-                    minY * (int)Constants.RegionSize,
-                    maxY * (int)Constants.RegionSize);
+                                    (int)Util.RegionToWorldLoc((uint)minX), (int)Util.RegionToWorldLoc((uint)maxX),
+                                    (int)Util.RegionToWorldLoc((uint)minY), (int)Util.RegionToWorldLoc((uint)maxY) );
 
                 if (regions != null)
                 {
                     foreach (GridRegion r in regions)
                     {
-                        if ((r.RegionLocX == minX * (int)Constants.RegionSize) &&
-                            (r.RegionLocY == minY * (int)Constants.RegionSize))
+                        if (r.RegionLocX == Util.RegionToWorldLoc((uint)minX)
+                            && r.RegionLocY == Util.RegionToWorldLoc((uint)minY) )
                         {
                             // found it => add it to response
                             MapBlockData block = new MapBlockData();
@@ -1055,10 +1054,8 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
         {
             List<MapBlockData> mapBlocks = new List<MapBlockData>();
             List<GridRegion> regions = m_scene.GridService.GetRegionRange(m_scene.RegionInfo.ScopeID,
-                (minX - 4) * (int)Constants.RegionSize,
-                (maxX + 4) * (int)Constants.RegionSize,
-                (minY - 4) * (int)Constants.RegionSize,
-                (maxY + 4) * (int)Constants.RegionSize);
+                        (int)Util.RegionToWorldLoc((uint)(minX - 4)), (int)Util.RegionToWorldLoc((uint)(maxX + 4)),
+                        (int)Util.RegionToWorldLoc((uint)(minY - 4)), (int)Util.RegionToWorldLoc((uint)(maxY + 4)) );
             foreach (GridRegion r in regions)
             {
                 MapBlockData block = new MapBlockData();
@@ -1086,8 +1083,8 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
                 break;
             }
             block.Name = r.RegionName;
-            block.X = (ushort)(r.RegionLocX / Constants.RegionSize);
-            block.Y = (ushort)(r.RegionLocY / Constants.RegionSize);
+            block.X = (ushort)Util.WorldToRegionLoc((uint)r.RegionLocX);
+            block.Y = (ushort)Util.WorldToRegionLoc((uint)r.RegionLocY);
         }
 
         public Hashtable OnHTTPThrottled(Hashtable keysvals)
@@ -1218,10 +1215,10 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
 
             List<MapBlockData> mapBlocks = new List<MapBlockData>();
             List<GridRegion> regions = m_scene.GridService.GetRegionRange(m_scene.RegionInfo.ScopeID,
-                    (int)(m_scene.RegionInfo.RegionLocX - 9) * (int)Constants.RegionSize,
-                    (int)(m_scene.RegionInfo.RegionLocX + 9) * (int)Constants.RegionSize,
-                    (int)(m_scene.RegionInfo.RegionLocY - 9) * (int)Constants.RegionSize,
-                    (int)(m_scene.RegionInfo.RegionLocY + 9) * (int)Constants.RegionSize);
+                    (int)Util.RegionToWorldLoc(m_scene.RegionInfo.RegionLocX - 9),
+                    (int)Util.RegionToWorldLoc(m_scene.RegionInfo.RegionLocX + 9),
+                    (int)Util.RegionToWorldLoc(m_scene.RegionInfo.RegionLocY - 9),
+                    (int)Util.RegionToWorldLoc(m_scene.RegionInfo.RegionLocY + 9));
             List<AssetBase> textures = new List<AssetBase>();
             List<Image> bitImages = new List<Image>();
 
diff --git a/OpenSim/Region/Framework/Interfaces/IEntityTransferModule.cs b/OpenSim/Region/Framework/Interfaces/IEntityTransferModule.cs
index 1949a90..966916a 100644
--- a/OpenSim/Region/Framework/Interfaces/IEntityTransferModule.cs
+++ b/OpenSim/Region/Framework/Interfaces/IEntityTransferModule.cs
@@ -72,12 +72,11 @@ namespace OpenSim.Region.Framework.Interfaces
 
         void EnableChildAgent(ScenePresence agent, GridRegion region);
 
-        GridRegion GetDestination(Scene scene, UUID agentID, Vector3 pos, out uint xDest, out uint yDest, out string version, out Vector3 newpos);
+        GridRegion GetDestination(Scene scene, UUID agentID, Vector3 pos, out string version, out Vector3 newpos);
 
         void Cross(SceneObjectGroup sog, Vector3 position, bool silent);
 
-        ScenePresence CrossAgentToNewRegionAsync(ScenePresence agent, Vector3 pos, GridRegion neighbourRegion, bool isFlying, string version);
-
+        ScenePresence CrossAgentToNewRegionAsync(ScenePresence agent, Vector3 pos, GridRegion neighbourRegion, bool isFlying, string version);

     }
 
     public interface IUserAgentVerificationModule
diff --git a/OpenSim/Region/Framework/Interfaces/ISimulationDataService.cs b/OpenSim/Region/Framework/Interfaces/ISimulationDataService.cs
index 085b5ca..8948f04 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 3787ca0..917b5d1 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);
@@ -135,4 +144,5 @@ 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..469bd31 100644
--- a/OpenSim/Region/Framework/Interfaces/ITerrainChannel.cs
+++ b/OpenSim/Region/Framework/Interfaces/ITerrainChannel.cs
@@ -25,13 +25,22 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+using OpenSim.Framework;
+
 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
@@ -40,7 +49,10 @@ 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);
diff --git a/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs b/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs
index 9cc5cde..b86f349 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs
@@ -46,8 +46,8 @@ namespace OpenSim.Region.Framework.Scenes
 {
     public partial class Scene
     {
-        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 = "[SCENE INVENTORY]";
 
         /// <summary>
         /// Allows asynchronous derezzing of objects from the scene into a client's inventory.
diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index 610bcd6..d8a4ed1 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -1033,7 +1033,7 @@ namespace OpenSim.Region.Framework.Scenes
 
             BordersLocked = true;
             Border northBorder = new Border();
-            northBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, (int)Constants.RegionSize);  //<---
+            northBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, (float)RegionInfo.RegionSizeY);  //<---
             northBorder.CrossDirection = Cardinals.N;
             NorthBorders.Add(northBorder);
 
@@ -1043,7 +1043,7 @@ namespace OpenSim.Region.Framework.Scenes
             SouthBorders.Add(southBorder);
 
             Border eastBorder = new Border();
-            eastBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, (int)Constants.RegionSize);   //<---
+            eastBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, (float)RegionInfo.RegionSizeY);   //<---
             eastBorder.CrossDirection = Cardinals.E;
             EastBorders.Add(eastBorder);
 
@@ -1099,8 +1099,9 @@ namespace OpenSim.Region.Framework.Scenes
         /// <returns>True after all operations complete, throws exceptions otherwise.</returns>
         public override void OtherRegionUp(GridRegion otherRegion)
         {
-            uint xcell = (uint)((int)otherRegion.RegionLocX / (int)Constants.RegionSize);
-            uint ycell = (uint)((int)otherRegion.RegionLocY / (int)Constants.RegionSize);
+            uint xcell = Util.WorldToRegionLoc((uint)otherRegion.RegionLocX);
+            uint ycell = Util.WorldToRegionLoc((uint)otherRegion.RegionLocY);
+
             //m_log.InfoFormat("[SCENE]: (on region {0}): Region {1} up in coords {2}-{3}", 
             //    RegionInfo.RegionName, otherRegion.RegionName, xcell, ycell);
 
@@ -1172,46 +1173,6 @@ namespace OpenSim.Region.Framework.Scenes
             return found;
         }
 
-        /// <summary>
-        /// Checks whether this region has a neighbour in the given direction.
-        /// </summary>
-        /// <param name="car"></param>
-        /// <param name="fix"></param>
-        /// <returns>
-        /// An integer which represents a compass point.  N == 1, going clockwise until we reach NW == 8.
-        /// Returns a positive integer if there is a region in that direction, a negative integer if not.
-        /// </returns>
-        public int HaveNeighbor(Cardinals car, ref int[] fix)
-        {
-            uint neighbourx = RegionInfo.RegionLocX;
-            uint neighboury = RegionInfo.RegionLocY;
-
-            int dir = (int)car;
-
-            if (dir > 1 && dir < 5) //Heading East
-                neighbourx++;
-            else if (dir > 5) // Heading West
-                neighbourx--;
-
-            if (dir < 3 || dir == 8) // Heading North
-                neighboury++;
-            else if (dir > 3 && dir < 7) // Heading Sout
-                neighboury--;
-
-            int x = (int)(neighbourx * Constants.RegionSize);
-            int y = (int)(neighboury * Constants.RegionSize);
-            GridRegion neighbourRegion = GridService.GetRegionByPosition(RegionInfo.ScopeID, x, y);
-
-            if (neighbourRegion == null)
-            {
-                fix[0] = (int)(RegionInfo.RegionLocX - neighbourx);
-                fix[1] = (int)(RegionInfo.RegionLocY - neighboury);
-                return dir * (-1);
-            }
-            else
-                return dir;
-        }
-
         // Alias IncomingHelloNeighbour OtherRegionUp, for now
         public GridRegion IncomingHelloNeighbour(RegionInfo neighbour)
         {
@@ -1894,7 +1855,7 @@ 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
@@ -1905,7 +1866,7 @@ 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);
                 }
@@ -2483,6 +2444,23 @@ namespace OpenSim.Region.Framework.Scenes
                 EntityTransferModule.Cross(grp, attemptedPosition, silent);
         }
 
+        // Simple test to see if a position is in the current region.
+        // Resuming the position is relative to the region so anything outside its bounds.
+        // Return 'true' if position inside region.
+        public bool PositionIsInCurrentRegion(Vector3 pos)
+        {
+            bool ret = true;
+            int xx = (int)Math.Floor(pos.X);
+            int yy = (int)Math.Floor(pos.Y);
+            if (xx < 0
+                    || xx >= RegionInfo.RegionSizeX
+                    || yy < 0
+                    || yy >= RegionInfo.RegionSizeY)
+                ret = false;
+            return ret;
+
+        }
+
         public Border GetCrossedBorder(Vector3 position, Cardinals gridline)
         {
             if (BordersLocked)
@@ -3900,6 +3878,7 @@ namespace OpenSim.Region.Framework.Scenes
                 {
                     Border crossedBorder = GetCrossedBorder(acd.startpos, Cardinals.E);
                     acd.startpos.X = crossedBorder.BorderLine.Z - 1;
+                    m_log.DebugFormat("{0} NewUserConnection Adjusted border E. startpos={1}", LogHeader, acd.startpos);
                 }
 
                 if (TestBorderCross(acd.startpos, Cardinals.N))
@@ -3999,12 +3978,12 @@ namespace OpenSim.Region.Framework.Scenes
         {
             if (posX < 0)
                 posX = 0;
-            else if (posX >= 256)
-                posX = 255.999f;
+            else if (posX >= (float)RegionInfo.RegionSizeX)
+                posX = (float)RegionInfo.RegionSizeX - 0.001f;
             if (posY < 0)
                 posY = 0;
-            else if (posY >= 256)
-                posY = 255.999f;
+            else if (posY >= (float)RegionInfo.RegionSizeY)
+                posY = (float)RegionInfo.RegionSizeY - 0.001f;
 
             reason = String.Empty;
             if (Permissions.IsGod(agentID))
@@ -4298,7 +4277,7 @@ namespace OpenSim.Region.Framework.Scenes
                 "[SCENE]: Incoming child agent update for {0} in {1}", cAgentData.AgentID, RegionInfo.RegionName);
 
             // TODO: This check should probably be in QueryAccess().
-            ILandObject nearestParcel = GetNearestAllowedParcel(cAgentData.AgentID, Constants.RegionSize / 2, Constants.RegionSize / 2);
+            ILandObject nearestParcel = GetNearestAllowedParcel(cAgentData.AgentID, RegionInfo.RegionSizeX / 2, RegionInfo.RegionSizeY / 2);
             if (nearestParcel == null)
             {
                 m_log.InfoFormat(
@@ -4605,44 +4584,6 @@ 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);
@@ -4822,7 +4763,7 @@ namespace OpenSim.Region.Framework.Scenes
                 else
                 {
 
-                    if (pos.X > 0f && pos.X < Constants.RegionSize && pos.Y > 0f && pos.Y < Constants.RegionSize)
+                    if (pos.X > 0f && pos.X < RegionInfo.RegionSizeX && pos.Y > 0f && pos.Y < RegionInfo.RegionSizeY)
                     {
                         // The only time parcel != null when an object is inside a region is when
                         // there is nothing behind the landchannel.  IE, no land plugin loaded.
@@ -5483,7 +5424,7 @@ namespace OpenSim.Region.Framework.Scenes
         {
             Vector3 unitDirection = Vector3.Normalize(direction);
             //Making distance to search go through some sane limit of distance
-            for (float distance = 0; distance < Constants.RegionSize * 2; distance += .5f)
+            for (float distance = 0; distance < Math.Max(RegionInfo.RegionSizeX, RegionInfo.RegionSizeY) * 2; distance += .5f)
             {
                 Vector3 testPos = Vector3.Add(pos, Vector3.Multiply(unitDirection, distance));
                 if (parcel.ContainsPoint((int)testPos.X, (int)testPos.Y))
@@ -5537,9 +5478,9 @@ namespace OpenSim.Region.Framework.Scenes
             int count = 0;
             int avgx = 0;
             int avgy = 0;
-            for (int x = 0; x < Constants.RegionSize; x++)
+            for (int x = 0; x < RegionInfo.RegionSizeX; x++)
             {
-                for (int y = 0; y < Constants.RegionSize; y++)
+                for (int y = 0; y < RegionInfo.RegionSizeY; y++)
                 {
                     //Just keep a running average as we check if all the points are inside or not
                     if (parcel.ContainsPoint(x, y))
@@ -5563,31 +5504,33 @@ namespace OpenSim.Region.Framework.Scenes
 
         private Vector3 GetNearestRegionEdgePosition(ScenePresence avatar)
         {
-            float xdistance = avatar.AbsolutePosition.X < Constants.RegionSize / 2 ? avatar.AbsolutePosition.X : Constants.RegionSize - avatar.AbsolutePosition.X;
-            float ydistance = avatar.AbsolutePosition.Y < Constants.RegionSize / 2 ? avatar.AbsolutePosition.Y : Constants.RegionSize - avatar.AbsolutePosition.Y;
+            float xdistance = avatar.AbsolutePosition.X < RegionInfo.RegionSizeX / 2
+                                ? avatar.AbsolutePosition.X : RegionInfo.RegionSizeX - avatar.AbsolutePosition.X;
+            float ydistance = avatar.AbsolutePosition.Y < RegionInfo.RegionSizeY / 2
+                                ? avatar.AbsolutePosition.Y : RegionInfo.RegionSizeY - avatar.AbsolutePosition.Y;
 
             //find out what vertical edge to go to
             if (xdistance < ydistance)
             {
-                if (avatar.AbsolutePosition.X < Constants.RegionSize / 2)
+                if (avatar.AbsolutePosition.X < RegionInfo.RegionSizeX / 2)
                 {
                     return GetPositionAtAvatarHeightOrGroundHeight(avatar, 0.0f, avatar.AbsolutePosition.Y);
                 }
                 else
                 {
-                    return GetPositionAtAvatarHeightOrGroundHeight(avatar, Constants.RegionSize, avatar.AbsolutePosition.Y);
+                    return GetPositionAtAvatarHeightOrGroundHeight(avatar, RegionInfo.RegionSizeY, avatar.AbsolutePosition.Y);
                 }
             }
             //find out what horizontal edge to go to
             else
             {
-                if (avatar.AbsolutePosition.Y < Constants.RegionSize / 2)
+                if (avatar.AbsolutePosition.Y < RegionInfo.RegionSizeY / 2)
                 {
                     return GetPositionAtAvatarHeightOrGroundHeight(avatar, avatar.AbsolutePosition.X, 0.0f);
                 }
                 else
                 {
-                    return GetPositionAtAvatarHeightOrGroundHeight(avatar, avatar.AbsolutePosition.X, Constants.RegionSize);
+                    return GetPositionAtAvatarHeightOrGroundHeight(avatar, avatar.AbsolutePosition.X, RegionInfo.RegionSizeY);
                 }
             }
         }
diff --git a/OpenSim/Region/Framework/Scenes/SceneBase.cs b/OpenSim/Region/Framework/Scenes/SceneBase.cs
index c86f412..b059ecf 100644
--- a/OpenSim/Region/Framework/Scenes/SceneBase.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneBase.cs
@@ -42,8 +42,8 @@ namespace OpenSim.Region.Framework.Scenes
 {
     public abstract class SceneBase : IScene
     {
-        protected static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

-        protected static readonly string LogHeader = "[SCENE]";
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly string LogHeader = "[SCENE]";
 
         #region Events
 
diff --git a/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs b/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
index 77889fa..c873e40 100644
--- a/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
@@ -92,7 +92,7 @@ namespace OpenSim.Region.Framework.Scenes
             {
                 m_log.DebugFormat(
                     "[SCENE COMMUNICATION SERVICE]: Region {0} successfully informed neighbour {1} at {2}-{3} that it is up",
-                    m_scene.Name, neighbour.RegionName, x / Constants.RegionSize, y / Constants.RegionSize);
+                    m_scene.Name, neighbour.RegionName, Util.WorldToRegionLoc(x), Util.WorldToRegionLoc(y));
 
                 m_scene.EventManager.TriggerOnRegionUp(neighbour);
             }
@@ -100,7 +100,7 @@ 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 +166,7 @@ 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;
@@ -203,7 +203,7 @@ 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);
 
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
index 9bd7632..c6b98ca 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
@@ -334,7 +334,7 @@ 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);
     
@@ -466,8 +466,6 @@ namespace OpenSim.Region.Framework.Scenes
                         && !IsAttachmentCheckFull() && (!Scene.LoadingPrims))
                     {
                         IEntityTransferModule entityTransfer = m_scene.RequestModuleInterface<IEntityTransferModule>();
-                        uint x = 0;
-                        uint y = 0;
                         string version = String.Empty;
                         Vector3 newpos = Vector3.Zero;
                         OpenSim.Services.Interfaces.GridRegion destination = null;
@@ -487,7 +485,7 @@ namespace OpenSim.Region.Framework.Scenes
 
                             // We set the avatar position as being the object
                             // position to get the region to send to
-                            if ((destination = entityTransfer.GetDestination(m_scene, av.UUID, val, out x, out y, out version, out newpos)) == null)
+                            if ((destination = entityTransfer.GetDestination(m_scene, av.UUID, val, out version, out newpos)) == null)
                             {
                                 canCross = false;
                                 break;
@@ -522,14 +520,14 @@ namespace OpenSim.Region.Framework.Scenes
                             m_scene.CrossPrimGroupIntoNewRegion(val, this, true);
 
                             // Normalize
-                            if (val.X >= Constants.RegionSize)
-                                val.X -= Constants.RegionSize;
-                            if (val.Y >= Constants.RegionSize)
-                                val.Y -= Constants.RegionSize;
+                            if (val.X >= m_scene.RegionInfo.RegionSizeX)
+                                val.X -= m_scene.RegionInfo.RegionSizeX;
+                            if (val.Y >= m_scene.RegionInfo.RegionSizeY)
+                                val.Y -= m_scene.RegionInfo.RegionSizeY;
                             if (val.X < 0)
-                                val.X += Constants.RegionSize;
+                                val.X += m_scene.RegionInfo.RegionSizeX;
                             if (val.Y < 0)
-                                val.Y += Constants.RegionSize;
+                                val.Y += m_scene.RegionInfo.RegionSizeY;
 
                             // If it's deleted, crossing was successful
                             if (IsDeleted)
@@ -577,9 +575,9 @@ namespace OpenSim.Region.Framework.Scenes
                             }
                         }
                         Vector3 oldp = AbsolutePosition;
-                        val.X = Util.Clamp<float>(oldp.X, 0.5f, (float)Constants.RegionSize - 0.5f);
-                        val.Y = Util.Clamp<float>(oldp.Y, 0.5f, (float)Constants.RegionSize - 0.5f);
-                        val.Z = Util.Clamp<float>(oldp.Z, 0.5f, 4096.0f);
+                        val.X = Util.Clamp<float>(oldp.X, 0.5f, (float)m_scene.RegionInfo.RegionSizeX - 0.5f);
+                        val.Y = Util.Clamp<float>(oldp.Y, 0.5f, (float)m_scene.RegionInfo.RegionSizeY - 0.5f);
+                        val.Z = Util.Clamp<float>(oldp.Z, 0.5f, Constants.RegionHeight);
                     }
                 }
 
@@ -996,9 +994,9 @@ namespace OpenSim.Region.Framework.Scenes
             maxX = -256f;
             maxY = -256f;
             maxZ = -256f;
-            minX = 256f;
-            minY = 256f;
-            minZ = 8192f;
+            minX = 10000f;
+            minY = 10000f;
+            minZ = 10000f;
 
             SceneObjectPart[] parts = m_parts.GetArray();
             for (int i = 0; i < parts.Length; i++)
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 5e80f5a..b52f48c 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -76,6 +76,7 @@ namespace OpenSim.Region.Framework.Scenes
     public class ScenePresence : EntityBase, IScenePresence
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static readonly String LogHeader = "[SCENE PRESENCE]";
 
 //        ~ScenePresence()
 //        {
@@ -749,9 +750,8 @@ 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);
@@ -773,9 +773,7 @@ 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);
             }
         }
@@ -1109,7 +1107,7 @@ 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;
@@ -2364,7 +2362,7 @@ 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
@@ -2382,8 +2380,8 @@ 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)
@@ -2394,7 +2392,7 @@ 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)];
             pos.Z = Math.Max(terrainHeight, pos.Z);
 
             // Fudge factor.  It appears that if one clicks "go here" on a piece of ground, the go here request is
@@ -3429,10 +3427,14 @@ namespace OpenSim.Region.Framework.Scenes
             if (!IsInTransit)
             {
                 Vector3 pos2 = AbsolutePosition;
+                Vector3 origPosition = pos2;
                 Vector3 vel = Velocity;
                 int neighbor = 0;
                 int[] fix = new int[2];
 
+                // Compute the avatar position in the next physics tick.
+                // If the avatar will be crossing, we force the crossing to happen now
+                //     in the hope that this will make the avatar movement smoother when crossing.
                 float timeStep = 0.1f;
                 pos2.X = pos2.X + (vel.X * timeStep);
                 pos2.Y = pos2.Y + (vel.Y * timeStep);
@@ -3440,111 +3442,44 @@ namespace OpenSim.Region.Framework.Scenes
 
                 if (!IsInTransit)
                 {
-//                    m_log.DebugFormat(
-//                        "[SCENE PRESENCE]: Testing border check for projected position {0} of {1} in {2}", 
-//                        pos2, Name, Scene.Name);
-
-                    // Checks if where it's headed exists a region
-                    bool needsTransit = false;
-                    if (m_scene.TestBorderCross(pos2, Cardinals.W))
+                    if (!m_scene.PositionIsInCurrentRegion(pos2))
                     {
-                        if (m_scene.TestBorderCross(pos2, Cardinals.S))
-                        {
-                            needsTransit = true;
-                            neighbor = m_scene.HaveNeighbor(Cardinals.SW, ref fix);
-                        }
-                        else if (m_scene.TestBorderCross(pos2, Cardinals.N))
+                        m_log.DebugFormat("{0} CheckForBorderCrossing: position outside region. {1} in {2} at pos {3}", 
+                                                LogHeader, Name, Scene.Name, pos2);
+
+                        // Disconnect from the current region
+                        bool isFlying = Flying;
+                        RemoveFromPhysicalScene();
+                        // pos2 is the forcasted position so make that the 'current' position so the crossing
+                        //    code will move us into the newly addressed region.
+                        m_pos = pos2;
+                        if (CrossToNewRegion())
                         {
-                            needsTransit = true;
-                            neighbor = m_scene.HaveNeighbor(Cardinals.NW, ref fix);
+                            AddToPhysicalScene(isFlying);
                         }
                         else
                         {
-                            needsTransit = true;
-                            neighbor = m_scene.HaveNeighbor(Cardinals.W, ref fix);
-                        }
-                    }
-                    else if (m_scene.TestBorderCross(pos2, Cardinals.E))
-                    {
-                        if (m_scene.TestBorderCross(pos2, Cardinals.S))
-                        {
-                            needsTransit = true;
-                            neighbor = m_scene.HaveNeighbor(Cardinals.SE, ref fix);
-                        }
-                        else if (m_scene.TestBorderCross(pos2, Cardinals.N))
-                        {
-                            needsTransit = true;
-                            neighbor = m_scene.HaveNeighbor(Cardinals.NE, ref fix);
-                        }
-                        else
-                        {
-                            needsTransit = true;
-                            neighbor = m_scene.HaveNeighbor(Cardinals.E, ref fix);
-                        }
-                    }
-                    else if (m_scene.TestBorderCross(pos2, Cardinals.S))
-                    {
-                        needsTransit = true;
-                        neighbor = m_scene.HaveNeighbor(Cardinals.S, ref fix);
-                    }
-                    else if (m_scene.TestBorderCross(pos2, Cardinals.N))
-                    {
-                        needsTransit = true;
-                        neighbor = m_scene.HaveNeighbor(Cardinals.N, ref fix);
-                    }
-
-                    // Makes sure avatar does not end up outside region
-                    if (neighbor <= 0)
-                    {
-                        if (needsTransit)
-                        {
-                            if (m_requestedSitTargetUUID == UUID.Zero)
-                            {
-                                bool isFlying = Flying;
-                                RemoveFromPhysicalScene();
-
-                                Vector3 pos = AbsolutePosition;
-                                if (AbsolutePosition.X < 0)
-                                    pos.X += Velocity.X * 2;
-                                else if (AbsolutePosition.X > Constants.RegionSize)
-                                    pos.X -= Velocity.X * 2;
-                                if (AbsolutePosition.Y < 0)
-                                    pos.Y += Velocity.Y * 2;
-                                else if (AbsolutePosition.Y > Constants.RegionSize)
-                                    pos.Y -= Velocity.Y * 2;
-                                Velocity = Vector3.Zero;
-                                AbsolutePosition = pos;
-
-//                                m_log.DebugFormat("[SCENE PRESENCE]: Prevented flyoff for {0} at {1}", Name, AbsolutePosition);
-
-                                AddToPhysicalScene(isFlying);
-                            }
-                        }
-                    }
-                    else if (neighbor > 0)
-                    {
-                        if (!CrossToNewRegion())
-                        {
+                            // Tried to make crossing happen but it failed.
                             if (m_requestedSitTargetUUID == UUID.Zero)
                             {
-                                bool isFlying = Flying;
-                                RemoveFromPhysicalScene();
-
-                                Vector3 pos = AbsolutePosition;
-                                if (AbsolutePosition.X < 0)
-                                    pos.X += Velocity.X * 2;
-                                else if (AbsolutePosition.X > Constants.RegionSize)
-                                    pos.X -= Velocity.X * 2;
-                                if (AbsolutePosition.Y < 0)
-                                    pos.Y += Velocity.Y * 2;
-                                else if (AbsolutePosition.Y > Constants.RegionSize)
-                                    pos.Y -= Velocity.Y * 2;
+                                m_log.DebugFormat("{0} CheckForBorderCrossing: Crossing failed. Restoring old position.", LogHeader);
+                                const float borderFudge = 0.1f;
+
+                                if (origPosition.X < 0)
+                                    origPosition.X = borderFudge;
+                                else if (origPosition.X > (float)m_scene.RegionInfo.RegionSizeX)
+                                    origPosition.X = (float)m_scene.RegionInfo.RegionSizeX - borderFudge;
+                                if (origPosition.Y < 0)
+                                    origPosition.Y = borderFudge;
+                                else if (origPosition.Y > (float)m_scene.RegionInfo.RegionSizeY)
+                                    origPosition.Y = (float)m_scene.RegionInfo.RegionSizeY - borderFudge;
                                 Velocity = Vector3.Zero;
-                                AbsolutePosition = pos;
+                                AbsolutePosition = origPosition;
 
                                 AddToPhysicalScene(isFlying);
                             }
                         }
+                             
                     }
                 }
                 else
@@ -3586,7 +3521,7 @@ 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();
         }
@@ -3613,9 +3548,7 @@ 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)));
@@ -3696,8 +3629,9 @@ namespace OpenSim.Region.Framework.Scenes
                 return;
 
             //m_log.Debug("   >>> ChildAgentPositionUpdate <<< " + rRegionX + "-" + rRegionY);
-            int shiftx = ((int)rRegionX - (int)tRegionX) * (int)Constants.RegionSize;
-            int shifty = ((int)rRegionY - (int)tRegionY) * (int)Constants.RegionSize;
+            // Find  the distance (in meters) between the two regions
+            uint shiftx = Util.RegionToWorldLoc(rRegionX - tRegionX);
+            uint shifty = Util.RegionToWorldLoc(rRegionY - tRegionY);
 
             Vector3 offset = new Vector3(shiftx, shifty, 0f);
 
diff --git a/OpenSim/Region/Framework/Scenes/TerrainChannel.cs b/OpenSim/Region/Framework/Scenes/TerrainChannel.cs
index c0ca48e..b4b1823 100644
--- a/OpenSim/Region/Framework/Scenes/TerrainChannel.cs
+++ b/OpenSim/Region/Framework/Scenes/TerrainChannel.cs
@@ -25,14 +25,19 @@
  * 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 log4net;
+
 namespace OpenSim.Region.Framework.Scenes
 {
     /// <summary>
@@ -40,132 +45,146 @@ 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();
+            int points = Width * Height;
+            float[] heights = new float[points];
 
-            return copy;
+            int idx = 0;
+            for (int jj = 0; jj < Height; jj++)
+                for (int ii = 0; ii < Width; ii++)
+                {
+                    heights[idx++] = m_terrainData[ii, jj];
+                }
+
+            return heights;
         }
 
-        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 { 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();
@@ -181,13 +200,7 @@ 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);
@@ -199,12 +212,50 @@ namespace OpenSim.Region.Framework.Scenes
             sr.Close();
         }
 
+        #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();
@@ -218,12 +269,15 @@ 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++)
@@ -236,35 +290,63 @@ namespace OpenSim.Region.Framework.Scenes
             }
         }
 
+        private class TerrainChannelXMLPackage
+        {
+            public int Version;
+            public int SizeX;
+            public int SizeY;
+            public int SizeZ;
+            public float CompressionFactor;
+            public short[] Map;
+            public TerrainChannelXMLPackage(int pX, int pY, int pZ, float pCompressionFactor, short[] 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..ced62e2
--- /dev/null
+++ b/OpenSim/Region/Framework/Scenes/TerrainCompressor.cs
@@ -0,0 +1,944 @@
+/*
+ * 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);
+        private static string LogHeader = "[TERRAIN COMPRESSOR]";
+
+        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();
+        }
+
+        // Unused: left for historical reference.
+        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;
+
+            byte landPacketType = (byte)TerrainPatch.LayerType.Land;
+            if (terrData.SizeX > Constants.RegionSize || terrData.SizeY > Constants.RegionSize)
+            {
+                // libOMV does not have a packet type defined for the extended parcel format.
+                // We just happen to know the extended parcel format code is one more than the usual code.
+                landPacketType++;
+            }
+
+            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>
+        /// <param name="pRegionSizeX"></param>
+        /// <param name="pRegionSizeY"></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, (uint)pRegionSizeX, (uint)pRegionSizeY, 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 b3fdd22..c8320d0 100644
--- a/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
+++ b/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
@@ -516,7 +516,7 @@ 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/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/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/BulletSPlugin/BSAPIXNA.cs b/OpenSim/Region/Physics/BulletSPlugin/BSAPIXNA.cs
index 17ebed2..aca1ed4 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSAPIXNA.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSAPIXNA.cs
@@ -1311,7 +1311,7 @@ private sealed class BulletConstraintXNA : BulletConstraint
         /* TODO */
         ConfigurationParameters[] configparms = new ConfigurationParameters[1];
         configparms[0] = parms;
-        Vector3 worldExtent = new Vector3(Constants.RegionSize, Constants.RegionSize, Constants.RegionHeight);
+        Vector3 worldExtent = maxPosition;
         m_maxCollisions = maxCollisions;
         m_maxUpdatesPerFrame = maxUpdates;
         specialCollisionObjects = new Dictionary<uint, GhostObject>();
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSPrim.cs b/OpenSim/Region/Physics/BulletSPlugin/BSPrim.cs
index 15b7090..edec949 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSPrim.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSPrim.cs
@@ -376,18 +376,19 @@ public class BSPrim : BSPhysObject
     {
         bool ret = false;
 
-        uint wayOutThere = Constants.RegionSize * Constants.RegionSize;
+        int wayOverThere = -1000;
+        int wayOutThere = 10000;
         // There have been instances of objects getting thrown way out of bounds and crashing
         //    the border crossing code.
-        if (   RawPosition.X < -Constants.RegionSize || RawPosition.X > wayOutThere
-            || RawPosition.Y < -Constants.RegionSize || RawPosition.Y > wayOutThere
-            || RawPosition.Z < -Constants.RegionSize || RawPosition.Z > wayOutThere)
+        if (   RawPosition.X < wayOverThere || RawPosition.X > wayOutThere
+            || RawPosition.Y < wayOverThere || RawPosition.X > wayOutThere
+            || RawPosition.Z < wayOverThere || RawPosition.X > wayOutThere)
         {
             RawPosition = new OMV.Vector3(10, 10, 50);
             ZeroMotion(inTaintTime);
             ret = true;
         }
-        if (RawVelocity.LengthSquared() > BSParam.MaxLinearVelocity)
+        if (RawVelocity.LengthSquared() > BSParam.MaxLinearVelocitySquared)
         {
             RawVelocity = Util.ClampV(RawVelocity, BSParam.MaxLinearVelocity);
             ret = true;
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs b/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs
index b3dfa41..fe014fc 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSScene.cs
@@ -208,8 +208,17 @@ public sealed class BSScene : PhysicsScene, IPhysicsParameters
         Name = EngineType + "/" + RegionName;
     }
 
+    // Old version of initialization that assumes legacy sized regions (256x256)
     public override void Initialise(IMesher meshmerizer, IConfigSource config)
     {
+        m_log.ErrorFormat("{0} WARNING WARNING WARNING! BulletSim initialized without region extent specification. Terrain will be messed up.");
+        Vector3 regionExtent = new Vector3( Constants.RegionSize, Constants.RegionSize, Constants.RegionSize);
+        Initialise(meshmerizer, config, regionExtent);
+        
+    }
+
+    public override void Initialise(IMesher meshmerizer, IConfigSource config, Vector3 regionExtent)
+    {
         mesher = meshmerizer;
         _taintOperations = new List<TaintCallbackEntry>();
         _postTaintOperations = new Dictionary<string, TaintCallbackEntry>();
@@ -250,13 +259,13 @@ public sealed class BSScene : PhysicsScene, IPhysicsParameters
         //    a child in a mega-region.
         // Bullet actually doesn't care about the extents of the simulated
         //    area. It tracks active objects no matter where they are.
-        Vector3 worldExtent = new Vector3(Constants.RegionSize, Constants.RegionSize, Constants.RegionHeight);
+        Vector3 worldExtent = regionExtent;
 
         World = PE.Initialize(worldExtent, Params, m_maxCollisionsPerFrame, ref m_collisionArray, m_maxUpdatesPerFrame, ref m_updateArray);
 
         Constraints = new BSConstraintCollection(World);
 
-        TerrainManager = new BSTerrainManager(this);
+        TerrainManager = new BSTerrainManager(this, worldExtent);
         TerrainManager.CreateInitialGroundPlaneAndTerrain();
 
         // Put some informational messages into the log file.
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainHeightmap.cs b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainHeightmap.cs
index 8888d6d..d70b2fb 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainHeightmap.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainHeightmap.cs
@@ -58,7 +58,7 @@ public sealed class BSTerrainHeightmap : BSTerrainPhys
         {
             initialMap[ii] = BSTerrainManager.HEIGHT_INITIALIZATION;
         }
-        m_mapInfo = new BulletHMapInfo(id, initialMap);
+        m_mapInfo = new BulletHMapInfo(id, initialMap, regionSize.X, regionSize.Y);
         m_mapInfo.minCoords = minTerrainCoords;
         m_mapInfo.maxCoords = maxTerrainCoords;
         m_mapInfo.terrainRegionBase = TerrainBase;
@@ -72,7 +72,7 @@ public sealed class BSTerrainHeightmap : BSTerrainPhys
                                                     Vector3 minCoords, Vector3 maxCoords)
         : base(physicsScene, regionBase, id)
     {
-        m_mapInfo = new BulletHMapInfo(id, initialMap);
+        m_mapInfo = new BulletHMapInfo(id, initialMap, maxCoords.X - minCoords.X, maxCoords.Y - minCoords.Y);
         m_mapInfo.minCoords = minCoords;
         m_mapInfo.maxCoords = maxCoords;
         m_mapInfo.minZ = minCoords.Z;
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
index 441d2d3..3013077 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
@@ -111,9 +111,11 @@ public sealed class BSTerrainManager : IDisposable
     private Vector3 m_worldMax;
     private PhysicsScene MegaRegionParentPhysicsScene { get; set; }
 
-    public BSTerrainManager(BSScene physicsScene)
+    public BSTerrainManager(BSScene physicsScene, Vector3 regionSize)
     {
         m_physicsScene = physicsScene;
+        DefaultRegionSize = regionSize;
+
         m_terrains = new Dictionary<Vector3,BSTerrainPhys>();
 
         // Assume one region of default size
@@ -268,7 +270,7 @@ public sealed class BSTerrainManager : IDisposable
             {
                 // There is already a terrain in this spot. Free the old and build the new.
                 DetailLog("{0},BSTErrainManager.UpdateTerrain:UpdateExisting,call,id={1},base={2},minC={3},maxC={4}",
-                                BSScene.DetailLogZero, id, terrainRegionBase, minCoords, minCoords);
+                                BSScene.DetailLogZero, id, terrainRegionBase, minCoords, maxCoords);
 
                 // Remove old terrain from the collection
                 m_terrains.Remove(terrainRegionBase);
diff --git a/OpenSim/Region/Physics/BulletSPlugin/BulletSimData.cs b/OpenSim/Region/Physics/BulletSPlugin/BulletSimData.cs
index 971ff9f..3425d9e 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BulletSimData.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BulletSimData.cs
@@ -165,14 +165,15 @@ public class BulletConstraint
 //      than making copies.
 public class BulletHMapInfo
 {
-    public BulletHMapInfo(uint id, float[] hm) {
+    public BulletHMapInfo(uint id, float[] hm, float pSizeX, float pSizeY) {
         ID = id;
         heightMap = hm;
         terrainRegionBase = OMV.Vector3.Zero;
         minCoords = new OMV.Vector3(100f, 100f, 25f);
         maxCoords = new OMV.Vector3(101f, 101f, 26f);
         minZ = maxZ = 0f;
-        sizeX = sizeY = 256f;
+        sizeX = pSizeX;
+        sizeY = pSizeY;
     }
     public uint ID;
     public float[] heightMap;
diff --git a/OpenSim/Region/Physics/Manager/PhysicsPluginManager.cs b/OpenSim/Region/Physics/Manager/PhysicsPluginManager.cs
index 8ccfda5..9b06353 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
 {
@@ -66,7 +67,8 @@ 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 +96,7 @@ 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 c93206d..71ad795 100644
--- a/OpenSim/Region/Physics/Manager/PhysicsScene.cs
+++ b/OpenSim/Region/Physics/Manager/PhysicsScene.cs
@@ -126,8 +126,17 @@ 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/RegionConnections.cs b/OpenSim/Region/RegionCombinerModule/RegionConnections.cs
index fba51d2..62a3a91 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.
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index e54b697..7b56abf 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -2107,7 +2107,7 @@ 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;
             }
@@ -2117,9 +2117,9 @@ 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
                 )
             )
@@ -4244,10 +4244,7 @@ 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)
@@ -4336,7 +4333,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             m_host.AddScriptLPS(1);
             UUID agentId = new UUID();
 
-            ulong regionHandle = Utils.UIntsToLong((uint)global_coords.x, (uint)global_coords.y);
+            ulong regionHandle = Util.RegionWorldLocToHandle((uint)global_coords.x, (uint)global_coords.y);
 
             if (UUID.TryParse(agent, out agentId))
             {
@@ -5481,7 +5478,7 @@ 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>
@@ -5628,7 +5625,7 @@ 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
                 {
@@ -5639,7 +5636,7 @@ 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 f4d5562..31ea067 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
@@ -450,7 +450,7 @@ 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)))
@@ -480,7 +480,7 @@ 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];
@@ -814,7 +814,8 @@ 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.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();
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
index c9902e4..d81cddc 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
@@ -713,16 +713,18 @@ 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.z > Constants.RegionHeight)
+                    Position.z = Constants.RegionHeight;
+                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;
                 prim.OSSL.llSetPos(Position);