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diff --git a/OpenSim/Region/PhysicsModules/BulletS/BulletSimData.cs b/OpenSim/Region/PhysicsModules/BulletS/BulletSimData.cs
new file mode 100755
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+++ b/OpenSim/Region/PhysicsModules/BulletS/BulletSimData.cs
@@ -0,0 +1,277 @@
+/*
+ * 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 OMV = OpenMetaverse;
+
+namespace OpenSim.Region.PhysicsModule.BulletS
+{
+// Classes to allow some type checking for the API
+// These hold pointers to allocated objects in the unmanaged space.
+// These classes are subclassed by the various physical implementations of
+// objects. In particular, there is a version for physical instances in
+// unmanaged memory ("unman") and one for in managed memory ("XNA").
+
+// Currently, the instances of these classes are a reference to a
+// physical representation and this has no releationship to other
+// instances. Someday, refarb the usage of these classes so each instance
+// refers to a particular physical instance and this class controls reference
+// counts and such. This should be done along with adding BSShapes.
+
+public class BulletWorld
+{
+    public BulletWorld(uint worldId, BSScene bss)
+    {
+        worldID = worldId;
+        physicsScene = bss;
+    }
+    public uint worldID;
+    // The scene is only in here so very low level routines have a handle to print debug/error messages
+    public BSScene physicsScene;
+}
+
+// An allocated Bullet btRigidBody
+public class BulletBody
+{
+    public BulletBody(uint id)
+    {
+        ID = id;
+        collisionType = CollisionType.Static;
+    }
+    public uint ID;
+    public CollisionType collisionType;
+
+    public virtual void Clear() { }
+    public virtual bool HasPhysicalBody { get { return false; } }
+
+    // Apply the specificed collision mask into the physical world
+    public virtual bool ApplyCollisionMask(BSScene physicsScene)
+    {
+        // Should assert the body has been added to the physical world.
+        // (The collision masks are stored in the collision proxy cache which only exists for
+        //    a collision body that is in the world.)
+        return physicsScene.PE.SetCollisionGroupMask(this,
+                                BulletSimData.CollisionTypeMasks[collisionType].group,
+                                BulletSimData.CollisionTypeMasks[collisionType].mask);
+    }
+
+    // Used for log messages for a unique display of the memory/object allocated to this instance
+    public virtual string AddrString
+    {
+        get { return "unknown"; }
+    }
+
+    public override string ToString()
+    {
+        StringBuilder buff = new StringBuilder();
+        buff.Append("<id=");
+        buff.Append(ID.ToString());
+        buff.Append(",p=");
+        buff.Append(AddrString);
+        buff.Append(",c=");
+        buff.Append(collisionType);
+        buff.Append(">");
+        return buff.ToString();
+    }
+}
+
+public class BulletShape
+{
+    public BulletShape()
+    {
+        shapeType = BSPhysicsShapeType.SHAPE_UNKNOWN;
+        shapeKey = (System.UInt64)FixedShapeKey.KEY_NONE;
+        isNativeShape = false;
+    }
+    public BSPhysicsShapeType shapeType;
+    public System.UInt64 shapeKey;
+    public bool isNativeShape;
+
+    public virtual void Clear() { }
+    public virtual bool HasPhysicalShape { get { return false; } }
+
+    // Make another reference to this physical object.
+    public virtual BulletShape Clone() { return new BulletShape(); }
+
+    // Return 'true' if this and other refer to the same physical object
+    public virtual bool ReferenceSame(BulletShape xx) { return false; }
+
+    // Used for log messages for a unique display of the memory/object allocated to this instance
+    public virtual string AddrString
+    {
+        get { return "unknown"; }
+    }
+
+    public override string ToString()
+    {
+        StringBuilder buff = new StringBuilder();
+        buff.Append("<p=");
+        buff.Append(AddrString);
+        buff.Append(",s=");
+        buff.Append(shapeType.ToString());
+        buff.Append(",k=");
+        buff.Append(shapeKey.ToString("X"));
+        buff.Append(",n=");
+        buff.Append(isNativeShape.ToString());
+        buff.Append(">");
+        return buff.ToString();
+    }
+}
+
+// An allocated Bullet btConstraint
+public class BulletConstraint
+{
+    public BulletConstraint()
+    {
+    }
+    public virtual void Clear() { }
+    public virtual bool HasPhysicalConstraint { get { return false; } }
+
+    // Used for log messages for a unique display of the memory/object allocated to this instance
+    public virtual string AddrString
+    {
+        get { return "unknown"; }
+    }
+}
+
+// An allocated HeightMapThing which holds various heightmap info.
+// Made a class rather than a struct so there would be only one
+//      instance of this and C# will pass around pointers rather
+//      than making copies.
+public class BulletHMapInfo
+{
+    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 = pSizeX;
+        sizeY = pSizeY;
+    }
+    public uint ID;
+    public float[] heightMap;
+    public OMV.Vector3 terrainRegionBase;
+    public OMV.Vector3 minCoords;
+    public OMV.Vector3 maxCoords;
+    public float sizeX, sizeY;
+    public float minZ, maxZ;
+    public BulletShape terrainShape;
+    public BulletBody terrainBody;
+}
+
+// The general class of collsion object.
+public enum CollisionType
+{
+    Avatar,
+    PhantomToOthersAvatar, // An avatar that it phantom to other avatars but not to anything else
+    Groundplane,
+    Terrain,
+    Static,
+    Dynamic,
+    VolumeDetect,
+    // Linkset, // A linkset should be either Static or Dynamic
+    LinksetChild,
+    Unknown
+};
+
+// Hold specification of group and mask collision flags for a CollisionType
+public struct CollisionTypeFilterGroup
+{
+    public CollisionTypeFilterGroup(CollisionType t, uint g, uint m)
+    {
+        type = t;
+        group = g;
+        mask = m;
+    }
+    public CollisionType type;
+    public uint group;
+    public uint mask;
+};
+
+public static class BulletSimData
+{
+
+// Map of collisionTypes to flags for collision groups and masks.
+// An object's 'group' is the collison groups this object belongs to
+// An object's 'filter' is the groups another object has to belong to in order to collide with me
+// A collision happens if ((obj1.group & obj2.filter) != 0) || ((obj2.group & obj1.filter) != 0)
+//
+// As mentioned above, don't use the CollisionFilterGroups definitions directly in the code
+//     but, instead, use references to this dictionary. Finding and debugging
+//     collision flag problems will be made easier.
+public static Dictionary<CollisionType, CollisionTypeFilterGroup> CollisionTypeMasks
+            = new Dictionary<CollisionType, CollisionTypeFilterGroup>()
+{
+    { CollisionType.Avatar,
+                new CollisionTypeFilterGroup(CollisionType.Avatar,
+                                (uint)CollisionFilterGroups.BCharacterGroup,
+                                (uint)(CollisionFilterGroups.BAllGroup))
+    },
+    { CollisionType.PhantomToOthersAvatar,
+        new CollisionTypeFilterGroup(CollisionType.PhantomToOthersAvatar,
+                                     (uint)CollisionFilterGroups.BCharacterGroup,
+                                     (uint)(CollisionFilterGroups.BAllGroup & ~CollisionFilterGroups.BCharacterGroup))
+    },
+    { CollisionType.Groundplane,
+                new CollisionTypeFilterGroup(CollisionType.Groundplane,
+                                (uint)CollisionFilterGroups.BGroundPlaneGroup,
+                                // (uint)CollisionFilterGroups.BAllGroup)
+                                (uint)(CollisionFilterGroups.BCharacterGroup | CollisionFilterGroups.BSolidGroup))
+    },
+    { CollisionType.Terrain,
+                new CollisionTypeFilterGroup(CollisionType.Terrain,
+                                (uint)CollisionFilterGroups.BTerrainGroup,
+                                (uint)(CollisionFilterGroups.BAllGroup & ~CollisionFilterGroups.BStaticGroup))
+    },
+    { CollisionType.Static,
+                new CollisionTypeFilterGroup(CollisionType.Static,
+                                (uint)CollisionFilterGroups.BStaticGroup,
+                                (uint)(CollisionFilterGroups.BCharacterGroup | CollisionFilterGroups.BSolidGroup))
+    },
+    { CollisionType.Dynamic,
+                new CollisionTypeFilterGroup(CollisionType.Dynamic,
+                                (uint)CollisionFilterGroups.BSolidGroup,
+                                (uint)(CollisionFilterGroups.BAllGroup))
+    },
+    { CollisionType.VolumeDetect,
+                new CollisionTypeFilterGroup(CollisionType.VolumeDetect,
+                                (uint)CollisionFilterGroups.BSensorTrigger,
+                                (uint)(~CollisionFilterGroups.BSensorTrigger))
+    },
+    { CollisionType.LinksetChild,
+                new CollisionTypeFilterGroup(CollisionType.LinksetChild,
+                                (uint)CollisionFilterGroups.BLinksetChildGroup,
+                                (uint)(CollisionFilterGroups.BNoneGroup))
+                                // (uint)(CollisionFilterGroups.BCharacterGroup | CollisionFilterGroups.BSolidGroup))
+    },
+};
+
+}
+}