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diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
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+++ b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
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+/*
+ * 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 copyrightD
+ *       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.
+ */
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using OpenSim.Framework;
+using OpenSim.Region.Framework;
+using OpenSim.Region.CoreModules;
+using OpenSim.Region.Physics.Manager;
+
+using Nini.Config;
+using log4net;
+
+using OpenMetaverse;
+
+namespace OpenSim.Region.Physics.BulletSPlugin
+{
+public class BSTerrainManager
+{
+    static string LogHeader = "[BULLETSIM TERRAIN MANAGER]";
+
+    BSScene m_physicsScene;
+
+    private BulletBody m_groundPlane;
+    
+    // If doing mega-regions, if we're region zero we will be managing multiple
+    //    region terrains since region zero does the physics for the whole mega-region.
+    private Dictionary<Vector2, BulletBody> m_terrains;
+    private Dictionary<Vector2, BulletHeightMapInfo> m_heightMaps;
+
+    // If we are doing mega-regions, terrains are added from TERRAIN_ID to m_terrainCount.
+    // This is incremented before assigning to new region so it is the last ID allocated.
+    private uint m_terrainCount = BSScene.CHILDTERRAIN_ID - 1;
+    public uint HighestTerrainID { get {return m_terrainCount; } }
+
+    // If doing mega-regions, this holds our offset from region zero of
+    //     the mega-regions. "parentScene" points to the PhysicsScene of region zero.
+    private Vector3 m_worldOffset = Vector3.Zero;
+    public Vector2 WorldExtents = new Vector2((int)Constants.RegionSize, (int)Constants.RegionSize);
+    private PhysicsScene m_parentScene = null;
+
+    public BSTerrainManager(BSScene physicsScene)
+    {
+        m_physicsScene = physicsScene;
+        m_terrains = new Dictionary<Vector2,BulletBody>();
+        m_heightMaps = new Dictionary<Vector2,BulletHeightMapInfo>();
+    }
+
+    // Create the initial instance of terrain and the underlying ground plane.
+    // The objects are allocated in the unmanaged space and the pointers are tracked
+    //    by the managed code.
+    // The terrains and the groundPlane are not added to the list of PhysObjects.
+    // This is called from the initialization routine so we presume it is
+    //    safe to call Bullet in real time. We hope no one is moving around prim yet.
+    public void CreateInitialGroundPlaneAndTerrain()
+    {
+        // The ground plane is here to catch things that are trying to drop to negative infinity
+        m_groundPlane = new BulletBody(BSScene.GROUNDPLANE_ID, 
+                        BulletSimAPI.CreateGroundPlaneBody2(BSScene.GROUNDPLANE_ID, 1f, 0.4f));
+        BulletSimAPI.AddObjectToWorld2(m_physicsScene.World.Ptr, m_groundPlane.Ptr);
+
+        Vector3 minTerrainCoords = new Vector3(0f, 0f, 24f);
+        Vector3 maxTerrainCoords = new Vector3(Constants.RegionSize, Constants.RegionSize, 25f);
+        int totalHeights = (int)maxTerrainCoords.X * (int)maxTerrainCoords.Y;
+        float[] initialMap = new float[totalHeights];
+        for (int ii = 0; ii < totalHeights; ii++)
+        {
+            initialMap[ii] = 25f;
+        }
+        CreateNewTerrainSegment(BSScene.TERRAIN_ID, initialMap, minTerrainCoords, maxTerrainCoords);
+    }
+
+    public void ReleaseGroundPlaneAndTerrain()
+    {
+        if (BulletSimAPI.RemoveObjectFromWorld2(m_physicsScene.World.Ptr, m_groundPlane.Ptr))
+        {
+            BulletSimAPI.DestroyObject2(m_physicsScene.World.Ptr, m_groundPlane.Ptr);
+        }
+        m_groundPlane.Ptr = IntPtr.Zero;
+
+        foreach (KeyValuePair<Vector2, BulletBody> kvp in m_terrains)
+        {
+            if (BulletSimAPI.RemoveObjectFromWorld2(m_physicsScene.World.Ptr, kvp.Value.Ptr))
+            {
+                BulletSimAPI.DestroyObject2(m_physicsScene.World.Ptr, kvp.Value.Ptr);
+                BulletSimAPI.ReleaseHeightmapInfo2(m_heightMaps[kvp.Key].Ptr);
+            }
+        }
+        m_terrains.Clear();
+        m_heightMaps.Clear();
+    }
+
+    // Create a new terrain description. This is used for mega-regions where
+    //    the children of region zero give region zero all of the terrain
+    //    segments since region zero does all the physics for the mega-region.
+    // Call at taint time!!
+    public void CreateNewTerrainSegment(uint id, float[] heightMap, Vector3 minCoords, Vector3 maxCoords)
+    {
+        // The Z coordinates are recalculated to be the min and max height of the terrain
+        //    itself. The caller may have passed us the real region extent.
+        float minZ = float.MaxValue;
+        float maxZ = float.MinValue;
+        int hSize = heightMap.Length;
+        for (int ii = 0; ii < hSize; ii++)
+        {
+            minZ = heightMap[ii] < minZ ? heightMap[ii] : minZ;
+            maxZ = heightMap[ii] > maxZ ? heightMap[ii] : maxZ;
+        }
+        minCoords.Z = minZ;
+        maxCoords.Z = maxZ;
+        // If the terrain is flat, make a difference so we get a good bounding box
+        if (minZ == maxZ) 
+            minZ -= 0.2f;
+        Vector2 terrainRegionBase = new Vector2(minCoords.X, minCoords.Y);
+
+        // Create the heightmap data structure in the unmanaged space
+        BulletHeightMapInfo mapInfo = new BulletHeightMapInfo(
+                            BulletSimAPI.CreateHeightmap2(minCoords, maxCoords, heightMap), heightMap);
+        mapInfo.terrainRegionBase = terrainRegionBase;
+        mapInfo.maxRegionExtent = maxCoords;
+        mapInfo.minZ = minZ;
+        mapInfo.maxZ = maxZ;
+        mapInfo.sizeX = maxCoords.X - minCoords.X;
+        mapInfo.sizeY = maxCoords.Y - minCoords.Y;
+
+        DetailLog("{0},BSScene.CreateNewTerrainSegment,call,minZ={1},maxZ={2},hMapPtr={3},minC={4},maxC={5}",
+                    BSScene.DetailLogZero, minZ, maxZ, mapInfo.Ptr, minCoords, maxCoords);
+        // Create the terrain body from that heightmap
+        BulletBody terrainBody = new BulletBody(id, BulletSimAPI.CreateTerrainBody2(id, mapInfo.Ptr, 0.01f));
+
+        BulletSimAPI.SetFriction2(terrainBody.Ptr, m_physicsScene.Params.terrainFriction);
+        BulletSimAPI.SetHitFraction2(terrainBody.Ptr, m_physicsScene.Params.terrainHitFraction);
+        BulletSimAPI.SetRestitution2(terrainBody.Ptr, m_physicsScene.Params.terrainRestitution);
+        BulletSimAPI.SetCollisionFlags2(terrainBody.Ptr, CollisionFlags.CF_STATIC_OBJECT);
+        BulletSimAPI.Activate2(terrainBody.Ptr, true);
+
+        // Add the new terrain to the dynamics world
+        BulletSimAPI.AddObjectToWorld2(m_physicsScene.World.Ptr, terrainBody.Ptr);
+        BulletSimAPI.UpdateSingleAabb2(m_physicsScene.World.Ptr, terrainBody.Ptr);
+
+
+        // Add the created terrain to the management set. If we are doing mega-regions,
+        //    the terrains of our children will be added.
+        m_terrains.Add(terrainRegionBase, terrainBody);
+        m_heightMaps.Add(terrainRegionBase, mapInfo);
+    }
+
+    public void SetTerrain(float[] heightMap) {
+        if (m_worldOffset != Vector3.Zero && m_parentScene != null)
+        {
+            // If doing the mega-prim stuff and we are the child of the zero region,
+            //    the terrain is really added to our parent
+            if (m_parentScene is BSScene)
+            {
+                ((BSScene)m_parentScene).TerrainManager.SetTerrain(heightMap, m_worldOffset);
+            }
+        }
+        else
+        {
+            // if not doing the mega-prim thing, just change the terrain
+            SetTerrain(heightMap, m_worldOffset);
+        }
+    }
+
+    private void SetTerrain(float[] heightMap, Vector3 tOffset)
+    {
+        float minZ = float.MaxValue;
+        float maxZ = float.MinValue;
+
+        // Copy heightMap local and compute some statistics.
+        // Not really sure if we need to do this deep copy but, given
+        //    the magic that happens to make the closure for taint
+        //    below, I don't want there to be any problem with sharing
+        //    locations of there are multiple calls to this routine
+        //    within one tick.
+        int heightMapSize = heightMap.Length;
+        float[] localHeightMap = new float[heightMapSize];
+        for (int ii = 0; ii < heightMapSize; ii++)
+        {
+            float height = heightMap[ii];
+            if (height < minZ) minZ = height;
+            if (height > maxZ) maxZ = height;
+            localHeightMap[ii] = height;
+        }
+
+        Vector2 terrainRegionBase = new Vector2(tOffset.X, tOffset.Y);
+        BulletHeightMapInfo mapInfo;
+        if (m_heightMaps.TryGetValue(terrainRegionBase, out mapInfo))
+        {
+            // If this is terrain we know about, it's easy to update
+            mapInfo.heightMap = localHeightMap;
+            m_physicsScene.TaintedObject("BSScene.SetTerrain:UpdateExisting", delegate()
+            {
+                DetailLog("{0},SetTerrain:UpdateExisting,baseX={1},baseY={2},minZ={3},maxZ={4}", 
+                                    BSScene.DetailLogZero, tOffset.X, tOffset.Y, minZ, maxZ);
+                BulletSimAPI.UpdateHeightMap2(m_physicsScene.World.Ptr, mapInfo.Ptr, mapInfo.heightMap);
+            });
+        }
+        else
+        {
+            // Our mega-prim child is giving us a new terrain to add to the phys world
+            uint newTerrainID = ++m_terrainCount;
+
+            Vector3 minCoords = tOffset;
+            minCoords.Z = minZ;
+            Vector3 maxCoords = new Vector3(tOffset.X + Constants.RegionSize,
+                                    tOffset.Y + Constants.RegionSize,
+                                    maxZ);
+            m_physicsScene.TaintedObject("BSScene.SetTerrain:NewTerrain", delegate()
+            {
+                DetailLog("{0},SetTerrain:NewTerrain,baseX={1},baseY={2}", BSScene.DetailLogZero, tOffset.X, tOffset.Y);
+                CreateNewTerrainSegment(newTerrainID, heightMap, minCoords, maxCoords);
+            });
+        }
+    }
+
+    // Someday we will have complex terrain with caves and tunnels
+    // For the moment, it's flat and convex
+    public float GetTerrainHeightAtXYZ(Vector3 loc)
+    {
+        return GetTerrainHeightAtXY(loc.X, loc.Y);
+    }
+
+    // Given an X and Y, find the height of the terrain.
+    // Since we could be handling multiple terrains for a mega-region,
+    //    the base of the region is calcuated assuming all regions are
+    //    the same size and that is the default.
+    // Once the heightMapInfo is found, we have all the information to
+    //    compute the offset into the array.
+    public float GetTerrainHeightAtXY(float tX, float tY)
+    {
+        float ret = 30f;
+
+        int offsetX = ((int)(tX / (int)Constants.RegionSize)) * (int)Constants.RegionSize;
+        int offsetY = ((int)(tY / (int)Constants.RegionSize)) * (int)Constants.RegionSize;
+        Vector2 terrainBaseXY = new Vector2(offsetX, offsetY);
+
+        BulletHeightMapInfo mapInfo;
+        if (m_heightMaps.TryGetValue(terrainBaseXY, out mapInfo))
+        {
+            float regionX = tX - offsetX;
+            float regionY = tY - offsetY;
+            regionX = regionX > mapInfo.sizeX ? 0 : regionX;
+            regionY = regionY > mapInfo.sizeY ? 0 : regionY;
+            ret = mapInfo.heightMap[(int)(regionX * mapInfo.sizeX + regionY)];
+        }
+        else
+        {
+            m_physicsScene.Logger.ErrorFormat("{0} GetTerrainHeightAtXY: terrain not found: x={1}, y={2}",
+                LogHeader, tX, tY);
+        }
+        return ret;
+    }
+
+    // Although no one seems to check this, I do support combining.
+    public bool SupportsCombining()
+    {
+        return true;
+    }
+    // This call says I am a child to region zero in a mega-region. 'pScene' is that
+    //    of region zero, 'offset' is my offset from regions zero's origin, and
+    //    'extents' is the largest XY that is handled in my region.
+    public void Combine(PhysicsScene pScene, Vector3 offset, Vector3 extents)
+    {
+        m_worldOffset = offset;
+        WorldExtents = new Vector2(extents.X, extents.Y);
+        m_parentScene = pScene;
+    }
+
+    // Unhook all the combining that I know about.
+    public void UnCombine(PhysicsScene pScene)
+    {
+        // Just like ODE, for the moment a NOP
+    }
+
+
+    private void DetailLog(string msg, params Object[] args)
+    {
+        m_physicsScene.PhysicsLogging.Write(msg, args);
+    }
+}
+}