9 files changed, 379 insertions, 79 deletions

diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index e583590..70b0e0a 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -820,7 +820,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 agentCircuit.Id0 = currentAgentCircuit.Id0;
             }
 
-            if (NeedsNewAgent(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
+            // if (NeedsNewAgent(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
+            if (NeedsNewAgent(sp.Scene.DefaultDrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
             {
                 // brand new agent, let's create a new caps seed
                 agentCircuit.CapsPath = CapsUtil.GetRandomCapsObjectPath();
@@ -894,7 +895,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             IClientIPEndpoint ipepClient;
             string capsPath = String.Empty;
-            if (NeedsNewAgent(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
+            if (NeedsNewAgent(sp.Scene.DefaultDrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
             {
                 m_log.DebugFormat(
                     "[ENTITY TRANSFER MODULE]: Determined that region {0} at {1},{2} needs new child agent for incoming agent {3} from {4}",
@@ -1070,7 +1071,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             // Finally, let's close this previously-known-as-root agent, when the jump is outside the view zone
 
-            if (NeedsClosing(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
+            if (NeedsClosing(sp.Scene.DefaultDrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
             {
                 if (!sp.Scene.IncomingPreCloseClient(sp))
                     return;
@@ -1140,7 +1141,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             IClientIPEndpoint ipepClient;
             string capsPath = String.Empty;
-            if (NeedsNewAgent(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
+            if (NeedsNewAgent(sp.Scene.DefaultDrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
             {
                 m_log.DebugFormat(
                     "[ENTITY TRANSFER MODULE]: Determined that region {0} at {1},{2} needs new child agent for agent {3} from {4}",
@@ -1236,7 +1237,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             sp.MakeChildAgent();
 
             // Finally, let's close this previously-known-as-root agent, when the jump is outside the view zone
-            if (NeedsClosing(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
+            if (NeedsClosing(sp.Scene.DefaultDrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
             {
                 if (!sp.Scene.IncomingPreCloseClient(sp))
                     return;
@@ -2366,7 +2367,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             {
                 // 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, 
+                uint dd = Math.Max((uint)avatar.Scene.DefaultDrawDistance, 
                                 Math.Max(Scene.RegionInfo.RegionSizeX, Scene.RegionInfo.RegionSizeY));
 
                 uint startX = Util.RegionToWorldLoc(pRegionLocX) - dd + Constants.RegionSize/2;
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
index 3b38c71..d5fca71 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
@@ -199,6 +199,8 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
         public GridRegion GetRegionByPosition(UUID scopeID, int x, int y)
         {
             GridRegion region = null;
+            uint regionX = Util.WorldToRegionLoc((uint)x);
+            uint regionY = Util.WorldToRegionLoc((uint)y);
 
             // First see if it's a neighbour, even if it isn't on this sim.
             // Neighbour data is cached in memory, so this is fast
@@ -222,11 +224,15 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
             {
                 region = m_GridService.GetRegionByPosition(scopeID, x, y);
                 if (region == null)
+                {
                     m_log.DebugFormat("{0} GetRegionByPosition. Region not found by grid service. Pos=<{1},{2}>",
-                                        LogHeader, x, y);
+                                        LogHeader, regionX, regionY);
+                }
                 else
+                {
                     m_log.DebugFormat("{0} GetRegionByPosition. Requested region {1} from grid service. Pos=<{2},{3}>",
-                                        LogHeader, region.RegionName, x, y);
+                                        LogHeader, region.RegionName, regionX, regionY);
+                }
             }
             return region;
         }
diff --git a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
index 6e1e8d6..c22c5b6 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
@@ -96,9 +96,88 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         private Scene m_scene;
         private volatile bool m_tainted;
         private readonly Stack<LandUndoState> m_undo = new Stack<LandUndoState>(5);
-
+        
         private String m_InitialTerrain = "pinhead-island";
 
+        // If true, send terrain patch updates to clients based on their view distance
+        private bool m_sendTerrainUpdatesByViewDistance = false;
+
+        // Class to keep the per client collection of terrain patches that must be sent.
+        // A patch is set to 'true' meaning it should be sent to the client. Once the
+        //    patch packet is queued to the client, the bit for that patch is set to 'false'.
+        private class PatchUpdates
+        {
+            private bool[,] updated;    // for each patch, whether it needs to be sent to this client
+            private int updateCount;    // number of patches that need to be sent
+            public ScenePresence Presence;   // a reference to the client to send to
+            public PatchUpdates(TerrainData terrData, ScenePresence pPresence)
+            {
+                updated = new bool[terrData.SizeX / Constants.TerrainPatchSize, terrData.SizeY / Constants.TerrainPatchSize];
+                updateCount = 0;
+                Presence = pPresence;
+                // Initially, send all patches to the client
+                SetAll(true);
+            }
+            // Returns 'true' if there are any patches marked for sending
+            public bool HasUpdates()
+            {
+                return (updateCount > 0);
+            }
+            public void SetByXY(int x, int y, bool state)
+            {
+                this.SetByPatch(x / Constants.TerrainPatchSize, y / Constants.TerrainPatchSize, state);
+            }
+            public bool GetByPatch(int patchX, int patchY)
+            {
+                return updated[patchX, patchY];
+            }
+            public void SetByPatch(int patchX, int patchY, bool state)
+            {
+                bool prevState = updated[patchX, patchY];
+                if (!prevState && state)
+                    updateCount++;
+                if (prevState && !state)
+                    updateCount--;
+                updated[patchX, patchY] = state;
+            }
+            public void SetAll(bool state)
+            {
+                updateCount = 0;
+                for (int xx = 0; xx < updated.GetLength(0); xx++)
+                    for (int yy = 0; yy < updated.GetLength(1); yy++)
+                        updated[xx, yy] = state;
+                if (state)
+                    updateCount = updated.GetLength(0) * updated.GetLength(1);
+            }
+            // Logically OR's the terrain data's patch taint map into this client's update map.
+            public void SetAll(TerrainData terrData)
+            {
+                if (updated.GetLength(0) != (terrData.SizeX / Constants.TerrainPatchSize)
+                    || updated.GetLength(1) != (terrData.SizeY / Constants.TerrainPatchSize))
+                {
+                    throw new Exception(
+                        String.Format("{0} PatchUpdates.SetAll: patch array not same size as terrain. arr=<{1},{2}>, terr=<{3},{4}>",
+                                LogHeader, updated.GetLength(0), updated.GetLength(1),
+                                terrData.SizeX / Constants.TerrainPatchSize, terrData.SizeY / Constants.TerrainPatchSize)
+                    );
+                }
+                for (int xx = 0; xx < terrData.SizeX; xx += Constants.TerrainPatchSize)
+                {
+                    for (int yy = 0; yy < terrData.SizeY; yy += Constants.TerrainPatchSize)
+                    {
+                        // Only set tainted. The patch bit may be set if the patch was to be sent later.
+                        if (terrData.IsTaintedAt(xx, yy, false))
+                        {
+                            this.SetByXY(xx, yy, true);
+                        }
+                    }
+                }
+            }
+        }
+
+        // The flags of which terrain patches to send for each of the ScenePresence's
+        private Dictionary<UUID, PatchUpdates> m_perClientPatchUpdates = new Dictionary<UUID, PatchUpdates>();
+
         /// <summary>
         /// Human readable list of terrain file extensions that are supported.
         /// </summary>
@@ -127,7 +206,10 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         {
             IConfig terrainConfig = config.Configs["Terrain"];
             if (terrainConfig != null)
+            {
                 m_InitialTerrain = terrainConfig.GetString("InitialTerrain", m_InitialTerrain);
+                m_sendTerrainUpdatesByViewDistance = terrainConfig.GetBoolean("SendTerrainUpdatesByViewDistance", m_sendTerrainUpdatesByViewDistance);
+            }
         }
 
         public void AddRegion(Scene scene)
@@ -422,9 +504,46 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             }
         }
 
+        // Someone diddled terrain outside the normal code paths. Set the taintedness for all clients.
+        // ITerrainModule.TaintTerrain()
         public void TaintTerrain ()
         {
-            m_channel.GetTerrainData().TaintAllTerrain();
+            lock (m_perClientPatchUpdates)
+            {
+                // Set the flags for all clients so the tainted patches will be sent out
+                foreach (PatchUpdates pups in m_perClientPatchUpdates.Values)
+                {
+                    pups.SetAll(m_scene.Heightmap.GetTerrainData());
+                }
+            }
+        }
+
+        // ITerrainModule.PushTerrain()
+        public void PushTerrain(IClientAPI pClient)
+        {
+            if (m_sendTerrainUpdatesByViewDistance)
+            {
+                ScenePresence presence = m_scene.GetScenePresence(pClient.AgentId);
+                if (presence != null)
+                {
+                    lock (m_perClientPatchUpdates)
+                    {
+                        PatchUpdates pups;
+                        if (!m_perClientPatchUpdates.TryGetValue(pClient.AgentId, out pups))
+                        {
+                            // There is a ScenePresence without a send patch map. Create one.
+                            pups = new PatchUpdates(m_scene.Heightmap.GetTerrainData(), presence);
+                            m_perClientPatchUpdates.Add(presence.UUID, pups);
+                        }
+                        pups.SetAll(true);
+                    }
+                }
+            }
+            else
+            {
+                // The traditional way is to call into the protocol stack to send them all.
+                pClient.SendLayerData(new float[10]);
+            }
         }
 
         #region Plugin Loading Methods
@@ -676,6 +795,11 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                     }
                 }
             }
+
+            // This event also causes changes to be sent to the clients
+            CheckSendingPatchesToClients();
+
+            // If things changes, generate some events
             if (shouldTaint)
             {
                 m_scene.EventManager.TriggerTerrainTainted();
@@ -749,31 +873,13 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                 presence.ControllingClient.OnLandUndo -= client_OnLandUndo;
                 presence.ControllingClient.OnUnackedTerrain -= client_OnUnackedTerrain;
             }
+            if (m_perClientPatchUpdates.ContainsKey(client))
+            {
+                m_perClientPatchUpdates.Remove(client);
+            }
         }
         
         /// <summary>
-        /// Checks to see if the terrain has been modified since last check
-        /// but won't attempt to limit those changes to the limits specified in the estate settings
-        /// currently invoked by the command line operations in the region server only
-        /// </summary>
-        private void CheckForTerrainUpdates()
-        {
-            CheckForTerrainUpdates(false);
-        }
-
-        /// <summary>
-        /// Checks to see if the terrain has been modified since last check.
-        /// If it has been modified, every all the terrain patches are sent to the client.
-        /// If the call is asked to respect the estate settings for terrain_raise_limit and
-        /// terrain_lower_limit, it will clamp terrain updates between these values
-        /// currently invoked by client_OnModifyTerrain only and not the Commander interfaces
-        /// <param name="respectEstateSettings">should height map deltas be limited to the estate settings limits</param>
-        /// </summary>
-        private void CheckForTerrainUpdates(bool respectEstateSettings)
-        {
-        }
-
-        /// <summary>
         /// Scan over changes in the terrain and limit height changes. This enforces the
         ///     non-estate owner limits on rate of terrain editting.
         /// Returns 'true' if any heights were limited.
@@ -857,17 +963,140 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         /// <param name="y">The patch corner to send</param>
         private void SendToClients(TerrainData terrData, int x, int y)
         {
-            // We know the actual terrain data passed is ignored. This kludge saves changing IClientAPI.
-            //float[] heightMap = terrData.GetFloatsSerialized();
-            float[] heightMap = new float[10];
-            m_scene.ForEachClient(
-                delegate(IClientAPI controller)
+            if (m_sendTerrainUpdatesByViewDistance)
+            {
+                // Add that this patch needs to be sent to the accounting for each client.
+                lock (m_perClientPatchUpdates)
+                {
+                    m_scene.ForEachScenePresence(presence =>
+                        {
+                            PatchUpdates thisClientUpdates;
+                            if (!m_perClientPatchUpdates.TryGetValue(presence.UUID, out thisClientUpdates))
+                            {
+                                // There is a ScenePresence without a send patch map. Create one.
+                                thisClientUpdates = new PatchUpdates(terrData, presence);
+                                m_perClientPatchUpdates.Add(presence.UUID, thisClientUpdates);
+                            }
+                            thisClientUpdates.SetByXY(x, y, true);
+                        }
+                    );
+                }
+            }
+            else
+            {
+                // Legacy update sending where the update is sent out as soon as noticed
+                // We know the actual terrain data passed is ignored. This kludge saves changing IClientAPI.
+                //float[] heightMap = terrData.GetFloatsSerialized();
+                float[] heightMap = new float[10];
+                m_scene.ForEachClient(
+                    delegate(IClientAPI controller)
                     {
-                        controller.SendLayerData( x / Constants.TerrainPatchSize,
-                                                y / Constants.TerrainPatchSize,
-                                                heightMap);
+                        controller.SendLayerData(x / Constants.TerrainPatchSize,
+                                                 y / Constants.TerrainPatchSize,
+                                                 heightMap);
                     }
-            );
+                );
+            }
+        }
+
+        private class PatchesToSend : IComparable<PatchesToSend>
+        {
+            public int PatchX;
+            public int PatchY;
+            public float Dist;
+            public PatchesToSend(int pX, int pY, float pDist)
+            {
+                PatchX = pX;
+                PatchY = pY;
+                Dist = pDist;
+            }
+            public int CompareTo(PatchesToSend other)
+            {
+                return Dist.CompareTo(other.Dist);
+            }
+        }
+
+        // Called each frame time to see if there are any patches to send to any of the
+        //    ScenePresences.
+        // Loop through all the per-client info and send any patches necessary.
+        private void CheckSendingPatchesToClients()
+        {
+            lock (m_perClientPatchUpdates)
+            {
+                foreach (PatchUpdates pups in m_perClientPatchUpdates.Values)
+                {
+                    if (pups.HasUpdates())
+                    {
+                        // There is something that could be sent to this client.
+                        List<PatchesToSend> toSend = GetModifiedPatchesInViewDistance(pups);
+                        if (toSend.Count > 0)
+                        {
+                            // m_log.DebugFormat("{0} CheckSendingPatchesToClient: sending {1} patches to {2} in region {3}",
+                            //                     LogHeader, toSend.Count, pups.Presence.Name, m_scene.RegionInfo.RegionName);
+                            // Sort the patches to send by the distance from the presence
+                            toSend.Sort();
+                            foreach (PatchesToSend pts in toSend)
+                            {
+                                // TODO: one can send multiple patches in a packet. Do that.
+                                pups.Presence.ControllingClient.SendLayerData(pts.PatchX, pts.PatchY, null);
+                                // presence.ControllingClient.SendLayerData(xs.ToArray(), ys.ToArray(), null, TerrainPatch.LayerType.Land);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        private List<PatchesToSend> GetModifiedPatchesInViewDistance(PatchUpdates pups)
+        {
+            List<PatchesToSend> ret = new List<PatchesToSend>();
+
+            ScenePresence presence = pups.Presence;
+            if (presence == null)
+                return ret;
+
+            // Compute the area of patches within our draw distance
+            int startX = (((int) (presence.AbsolutePosition.X - presence.DrawDistance))/Constants.TerrainPatchSize) - 2;
+            startX = Math.Max(startX, 0);
+            startX = Math.Min(startX, (int)m_scene.RegionInfo.RegionSizeX/Constants.TerrainPatchSize);
+            int startY = (((int) (presence.AbsolutePosition.Y - presence.DrawDistance))/Constants.TerrainPatchSize) - 2;
+            startY = Math.Max(startY, 0);
+            startY = Math.Min(startY, (int)m_scene.RegionInfo.RegionSizeY/Constants.TerrainPatchSize);
+            int endX = (((int) (presence.AbsolutePosition.X + presence.DrawDistance))/Constants.TerrainPatchSize) + 2;
+            endX = Math.Max(endX, 0);
+            endX = Math.Min(endX, (int)m_scene.RegionInfo.RegionSizeX/Constants.TerrainPatchSize);
+            int endY = (((int) (presence.AbsolutePosition.Y + presence.DrawDistance))/Constants.TerrainPatchSize) + 2;
+            endY = Math.Max(endY, 0);
+            endY = Math.Min(endY, (int)m_scene.RegionInfo.RegionSizeY/Constants.TerrainPatchSize);
+            // m_log.DebugFormat("{0} GetModifiedPatchesInViewDistance. rName={1}, ddist={2}, apos={3}, start=<{4},{5}>, end=<{6},{7}>",
+            //                                     LogHeader, m_scene.RegionInfo.RegionName,
+            //                                     presence.DrawDistance, presence.AbsolutePosition,
+            //                                     startX, startY, endX, endY);
+            for (int x = startX; x < endX; x++)
+            {
+                for (int y = startY; y < endY; y++)
+                {
+                    //Need to make sure we don't send the same ones over and over
+                    Vector3 presencePos = presence.AbsolutePosition;
+                    Vector3 patchPos = new Vector3(x * Constants.TerrainPatchSize, y * Constants.TerrainPatchSize, presencePos.Z);
+                    if (pups.GetByPatch(x, y))
+                    {
+                        //Check which has less distance, camera or avatar position, both have to be done.
+                        //Its not a radius, its a diameter and we add 50 so that it doesn't look like it cuts off
+                        if (Util.DistanceLessThan(presencePos, patchPos, presence.DrawDistance + 50)
+                            || Util.DistanceLessThan(presence.CameraPosition, patchPos, presence.DrawDistance + 50))
+                        {
+                            //They can see it, send it to them
+                            pups.SetByPatch(x, y, false);
+                            float dist = Vector3.DistanceSquared(presencePos, patchPos);
+                            ret.Add(new PatchesToSend(x, y, dist));
+                            //Wait and send them all at once
+                            // pups.client.SendLayerData(x, y, null);
+                        }
+                    }
+                }
+            }
+            return ret;
         }
 
         private void client_OnModifyTerrain(UUID user, float height, float seconds, byte size, byte action,
diff --git a/OpenSim/Region/Framework/Interfaces/ITerrainModule.cs b/OpenSim/Region/Framework/Interfaces/ITerrainModule.cs
index a6f5d98..28f797a 100644
--- a/OpenSim/Region/Framework/Interfaces/ITerrainModule.cs
+++ b/OpenSim/Region/Framework/Interfaces/ITerrainModule.cs
@@ -24,9 +24,10 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+using System.IO;
 
+using OpenSim.Framework;
 
-using System.IO;
 using OpenMetaverse;
 
 namespace OpenSim.Region.Framework.Interfaces
@@ -44,6 +45,12 @@ namespace OpenSim.Region.Framework.Interfaces
         void TaintTerrain();
         
         /// <summary>
+        /// When a client initially connects, all the terrain must be pushed to the viewer.
+        /// This call causes all the terrain patches to be sent to the client.
+        /// </summary>
+        void PushTerrain(IClientAPI pClient);
+        
+        /// <summary>
         /// Load a terrain from a stream.
         /// </summary>
         /// <param name="filename">
diff --git a/OpenSim/Region/Framework/Scenes/SceneBase.cs b/OpenSim/Region/Framework/Scenes/SceneBase.cs
index 4208669..0445268 100644
--- a/OpenSim/Region/Framework/Scenes/SceneBase.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneBase.cs
@@ -213,7 +213,12 @@ namespace OpenSim.Region.Framework.Scenes
         /// <param name="RemoteClient">Client to send to</param>
         public virtual void SendLayerData(IClientAPI RemoteClient)
         {
-            RemoteClient.SendLayerData(Heightmap.GetFloatsSerialised());
+            // RemoteClient.SendLayerData(Heightmap.GetFloatsSerialised());
+            ITerrainModule terrModule = RequestModuleInterface<ITerrainModule>();
+            if (terrModule != null)
+            {
+                terrModule.PushTerrain(RemoteClient);
+            }
         }
 
         #endregion
diff --git a/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs b/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
index c873e40..45c3348 100644
--- a/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
@@ -52,6 +52,7 @@ namespace OpenSim.Region.Framework.Scenes
     public class SceneCommunicationService //one instance per region
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        private static string LogHeader = "[SCENE COMMUNIATION SERVICE]";
 
         protected RegionInfo m_regionInfo;
         protected Scene m_scene;
@@ -84,15 +85,12 @@ namespace OpenSim.Region.Framework.Scenes
             if (neighbourService != null)
                 neighbour = neighbourService.HelloNeighbour(regionhandle, region);
             else
-                m_log.DebugFormat(
-                    "[SCENE COMMUNICATION SERVICE]: No neighbour service provided for region {0} to inform neigbhours of status",
-                    m_scene.Name);
+                m_log.DebugFormat( "{0} neighbour service provided for region {0} to inform neigbhours of status", LogHeader, m_scene.Name);
 
             if (neighbour != null)
             {
-                m_log.DebugFormat(
-                    "[SCENE COMMUNICATION SERVICE]: Region {0} successfully informed neighbour {1} at {2}-{3} that it is up",
-                    m_scene.Name, neighbour.RegionName, Util.WorldToRegionLoc(x), Util.WorldToRegionLoc(y));
+                m_log.DebugFormat( "{0} Region {1} successfully informed neighbour {2} at {3}-{4} that it is up",
+                    LogHeader, m_scene.Name, neighbour.RegionName, Util.WorldToRegionLoc(x), Util.WorldToRegionLoc(y));
 
                 m_scene.EventManager.TriggerOnRegionUp(neighbour);
             }
@@ -111,9 +109,7 @@ namespace OpenSim.Region.Framework.Scenes
             List<GridRegion> neighbours
                 = m_scene.GridService.GetNeighbours(m_scene.RegionInfo.ScopeID, m_scene.RegionInfo.RegionID);
 
-            m_log.DebugFormat(
-                "[SCENE COMMUNICATION SERVICE]: Informing {0} neighbours that region {1} is up",
-                neighbours.Count, m_scene.Name);
+            m_log.DebugFormat("{0} Informing {1} neighbours that region {2} is up", LogHeader, neighbours.Count, m_scene.Name);
 
             foreach (GridRegion n in neighbours)
             {
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 37353c1..063ac73 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -873,7 +873,8 @@ namespace OpenSim.Region.Framework.Scenes
             m_sendCoarseLocationsMethod = SendCoarseLocationsDefault;
             Animator = new ScenePresenceAnimator(this);
             PresenceType = type;
-            DrawDistance = world.DefaultDrawDistance;
+            // DrawDistance = world.DefaultDrawDistance;
+            DrawDistance = Constants.RegionSize;
             RegionHandle = world.RegionInfo.RegionHandle;
             ControllingClient = client;
             Firstname = ControllingClient.FirstName;
@@ -1918,8 +1919,8 @@ namespace OpenSim.Region.Framework.Scenes
             // When we get to the point of re-computing neighbors everytime this
             // changes, then start using the agent's drawdistance rather than the 
             // region's draw distance.
-            // DrawDistance = agentData.Far;
-            DrawDistance = Scene.DefaultDrawDistance;
+            DrawDistance = agentData.Far;
+            // DrawDistance = Scene.DefaultDrawDistance;
 
             m_mouseLook = (flags & AgentManager.ControlFlags.AGENT_CONTROL_MOUSELOOK) != 0;
             m_leftButtonDown = (flags & AgentManager.ControlFlags.AGENT_CONTROL_LBUTTON_DOWN) != 0;
@@ -2277,8 +2278,8 @@ namespace OpenSim.Region.Framework.Scenes
             // When we get to the point of re-computing neighbors everytime this
             // changes, then start using the agent's drawdistance rather than the 
             // region's draw distance.
-            // DrawDistance = agentData.Far;
-            DrawDistance = Scene.DefaultDrawDistance;
+            DrawDistance = agentData.Far;
+            // DrawDistance = Scene.DefaultDrawDistance;
 
             // Check if Client has camera in 'follow cam' or 'build' mode.
             Vector3 camdif = (Vector3.One * Rotation - Vector3.One * CameraRotation);
@@ -3824,8 +3825,8 @@ namespace OpenSim.Region.Framework.Scenes
             // When we get to the point of re-computing neighbors everytime this
             // changes, then start using the agent's drawdistance rather than the 
             // region's draw distance.
-            // DrawDistance = cAgentData.Far;
-            DrawDistance = Scene.DefaultDrawDistance;
+            DrawDistance = cAgentData.Far;
+            // DrawDistance = Scene.DefaultDrawDistance;
 
             if (cAgentData.Position != marker) // UGH!!
                 m_pos = cAgentData.Position + offset;
@@ -3935,8 +3936,8 @@ namespace OpenSim.Region.Framework.Scenes
             // When we get to the point of re-computing neighbors everytime this
             // changes, then start using the agent's drawdistance rather than the 
             // region's draw distance.
-            // DrawDistance = cAgent.Far;
-            DrawDistance = Scene.DefaultDrawDistance;
+            DrawDistance = cAgent.Far;
+            // DrawDistance = Scene.DefaultDrawDistance;
 
             if ((cAgent.Throttles != null) && cAgent.Throttles.Length > 0)
                 ControllingClient.SetChildAgentThrottle(cAgent.Throttles);
diff --git a/OpenSim/Services/GridService/GridService.cs b/OpenSim/Services/GridService/GridService.cs
index 8198592..36957a7 100644
--- a/OpenSim/Services/GridService/GridService.cs
+++ b/OpenSim/Services/GridService/GridService.cs
@@ -46,6 +46,7 @@ namespace OpenSim.Services.GridService
         private static readonly ILog m_log =
                 LogManager.GetLogger(
                 MethodBase.GetCurrentMethod().DeclaringType);
+        private string LogHeader = "[GRID SERVICE]";
 
         private bool m_DeleteOnUnregister = true;
         private static GridService m_RootInstance = null;
@@ -328,7 +329,11 @@ namespace OpenSim.Services.GridService
                     }
                 }
 
-//                m_log.DebugFormat("[GRID SERVICE]: region {0} has {1} neighbours", region.RegionName, rinfos.Count);
+                // string rNames = "";
+                // foreach (GridRegion gr in rinfos)
+                //     rNames += gr.RegionName + ",";
+                // m_log.DebugFormat("{0} region {1} has {2} neighbours ({3})",
+                //             LogHeader, region.RegionName, rinfos.Count, rNames);
             }
             else
             {
@@ -657,7 +662,7 @@ namespace OpenSim.Services.GridService
                 return;
             }
 
-            RegionData region = m_Database.Get((int)Util.RegionToWorldLoc(x), (int)Util.RegionToWorldLoc(y), UUID.Zero);

+            RegionData region = m_Database.Get((int)Util.RegionToWorldLoc(x), (int)Util.RegionToWorldLoc(y), UUID.Zero);
             if (region == null)
             {
                 MainConsole.Instance.OutputFormat("No region found at {0},{1}", x, y);
diff --git a/OpenSim/Services/MapImageService/MapImageService.cs b/OpenSim/Services/MapImageService/MapImageService.cs
index 31e147b..0e425f8 100644
--- a/OpenSim/Services/MapImageService/MapImageService.cs
+++ b/OpenSim/Services/MapImageService/MapImageService.cs
@@ -36,6 +36,7 @@ using System.Drawing.Imaging;
 using System.IO;
 using System.Net;
 using System.Reflection;
+using System.Threading;
 
 using Nini.Config;
 using log4net;
@@ -53,6 +54,7 @@ namespace OpenSim.Services.MapImageService
         private static readonly ILog m_log =
                 LogManager.GetLogger(
                 MethodBase.GetCurrentMethod().DeclaringType);
+        private string LogHeader = "[MAP IMAGE SERVICE]";
 
         private const int ZOOM_LEVELS = 8;
         private const int IMAGE_WIDTH = 256;
@@ -114,7 +116,7 @@ namespace OpenSim.Services.MapImageService
                 }
             }
 
-            return UpdateMultiResolutionFiles(x, y, out reason);
+            return UpdateMultiResolutionFilesAsync(x, y, out reason);
         }
 
         public bool RemoveMapTile(int x, int y, out string reason)
@@ -136,33 +138,81 @@ namespace OpenSim.Services.MapImageService
                 }
             }
 
-            return UpdateMultiResolutionFiles(x, y, out reason);
+            return UpdateMultiResolutionFilesAsync(x, y, out reason);
         }
 
-        private bool UpdateMultiResolutionFiles(int x, int y, out string reason)
+        // When large varregions start up, they can send piles of new map tiles. This causes
+        //    this multi-resolution routine to be called a zillion times an causes much CPU
+        //    time to be spent creating multi-resolution tiles that will be replaced when
+        //    the next maptile arrives.
+        private class mapToMultiRez
+        {
+            public int xx;
+            public int yy;
+            public mapToMultiRez(int pX, int pY)
+            {
+                xx = pX;
+                yy = pY;
+            }
+        };
+        private Queue<mapToMultiRez> multiRezToBuild = new Queue<mapToMultiRez>();
+        private bool UpdateMultiResolutionFilesAsync(int x, int y, out string reason)
         {
             reason = String.Empty;
-            lock (m_Sync)
+            lock (multiRezToBuild)
             {
-                // Stitch seven more aggregate tiles together
-                for (uint zoomLevel = 2; zoomLevel <= ZOOM_LEVELS; zoomLevel++)
+                // m_log.DebugFormat("{0} UpdateMultiResolutionFilesAsync: scheduling update for <{1},{2}>", LogHeader, x, y);
+                multiRezToBuild.Enqueue(new mapToMultiRez(x, y));
+                if (multiRezToBuild.Count == 1)
+                    Util.FireAndForget(DoUpdateMultiResolutionFilesAsync);
+            }
+
+            return true;
+        }
+
+        private void DoUpdateMultiResolutionFilesAsync(object o)
+        {
+            // This sleep causes the FireAndForget thread to be different than the invocation thread.
+            // It also allows other tiles to be uploaded so the multi-rez images are more likely
+            //     to be correct.
+            Thread.Sleep(1 * 1000);
+
+            while (multiRezToBuild.Count > 0)
+            {
+                mapToMultiRez toMultiRez = null;
+                lock (multiRezToBuild)
                 {
-                    // Calculate the width (in full resolution tiles) and bottom-left
-                    // corner of the current zoom level
-                    int width = (int)Math.Pow(2, (double)(zoomLevel - 1));
-                    int x1 = x - (x % width);
-                    int y1 = y - (y % width);
+                    if (multiRezToBuild.Count > 0)
+                        toMultiRez = multiRezToBuild.Dequeue();
+                }
+                if (toMultiRez != null)
+                {
+                    int x = toMultiRez.xx;
+                    int y = toMultiRez.yy;
+                    // m_log.DebugFormat("{0} DoUpdateMultiResolutionFilesAsync: doing build for <{1},{2}>", LogHeader, x, y);
 
-                    if (!CreateTile(zoomLevel, x1, y1))
+                    // Stitch seven more aggregate tiles together
+                    for (uint zoomLevel = 2; zoomLevel <= ZOOM_LEVELS; zoomLevel++)
                     {
-                        m_log.WarnFormat("[MAP IMAGE SERVICE]: Unable to create tile for {0},{1} at zoom level {1}", x, y, zoomLevel);
-                        reason = string.Format("Map tile at zoom level {0} failed", zoomLevel);
-                        return false;
+                        // Calculate the width (in full resolution tiles) and bottom-left
+                        // corner of the current zoom level
+                        int width = (int)Math.Pow(2, (double)(zoomLevel - 1));
+                        int x1 = x - (x % width);
+                        int y1 = y - (y % width);
+
+                        lock (m_Sync)   // must lock the reading and writing of the maptile files
+                        {
+                            if (!CreateTile(zoomLevel, x1, y1))
+                            {
+                                m_log.WarnFormat("[MAP IMAGE SERVICE]: Unable to create tile for {0},{1} at zoom level {1}", x, y, zoomLevel);
+                                return;
+                            }
+                        }
                     }
                 }
             }
 
-            return true;
+            return;
         }
 
         public byte[] GetMapTile(string fileName, out string format)