Meshmerizer stores dictionary of unique Meshes keyed on construction parameters. CreateMesh() returns a Mesh from the dictionary or creates a new Mesh if it has not been created before. Meshes are never purged from the dictionary. The raw Mesh data is discarded once the memory is pinned for ODE use. All copies of the same prim/mesh use the same pinned memory. ONLY IMPLEMENTED AND TESTED WITH MESHMERIZER AND ODE

Signed-off-by: dahlia <dahliaTrimble@gmailDotCom>

OpenSim/Region/Physics/Meshing/Mesh.cs

@@ -40,7 +40,6 @@ namespace OpenSim.Region.Physics.Meshing
         private List<Triangle> triangles;
         GCHandle pinnedVirtexes;
         GCHandle pinnedIndex;
-        public PrimMesh primMesh = null;
         public float[] normals;
 
         public Mesh()
@@ -63,6 +62,8 @@ namespace OpenSim.Region.Physics.Meshing
 
         public void Add(Triangle triangle)
         {
+            if (pinnedIndex.IsAllocated || pinnedVirtexes.IsAllocated)
+                throw new NotSupportedException("Attempt to Add to a pinned Mesh");
             // If a vertex of the triangle is not yet in the vertices list,
             // add it and set its index to the current index count
             if (!vertices.ContainsKey(triangle.v1))
@@ -148,10 +149,10 @@ namespace OpenSim.Region.Physics.Meshing
 
         public float[] getVertexListAsFloatLocked()
         {
+            if( pinnedVirtexes.IsAllocated )
+                return (float[])(pinnedVirtexes.Target);
             float[] result;
 
-            if (primMesh == null)
-            {
             //m_log.WarnFormat("vertices.Count = {0}", vertices.Count);
             result = new float[vertices.Count * 3];
             foreach (KeyValuePair<Vertex, int> kvp in vertices)
@@ -164,24 +165,6 @@ namespace OpenSim.Region.Physics.Meshing
                 result[3 * i + 2] = v.Z;
             }
             pinnedVirtexes = GCHandle.Alloc(result, GCHandleType.Pinned);
-            }
-            else
-            {
-                int count = primMesh.coords.Count;
-                result = new float[count * 3];
-                for (int i = 0; i < count; i++)
-                {
-                    Coord c = primMesh.coords[i];
-                    {
-                        int resultIndex = 3 * i;
-                        result[resultIndex] = c.X;
-                        result[resultIndex + 1] = c.Y;
-                        result[resultIndex + 2] = c.Z;
-                    }
-
-                }
-                pinnedVirtexes = GCHandle.Alloc(result, GCHandleType.Pinned);
-            }
             return result;
         }
 
@@ -189,8 +172,6 @@ namespace OpenSim.Region.Physics.Meshing
         {
             int[] result;
 
-            if (primMesh == null)
-            {
             result = new int[triangles.Count * 3];
             for (int i = 0; i < triangles.Count; i++)
             {
@@ -199,24 +180,6 @@ namespace OpenSim.Region.Physics.Meshing
                 result[3 * i + 1] = vertices[t.v2];
                 result[3 * i + 2] = vertices[t.v3];
             }
-            }
-            else
-            {
-                int numFaces = primMesh.faces.Count;
-                result = new int[numFaces * 3];
-                for (int i = 0; i < numFaces; i++)
-                {
-                    Face f = primMesh.faces[i];
-//                    Coord c1 = primMesh.coords[f.v1];
-//                    Coord c2 = primMesh.coords[f.v2];
-//                    Coord c3 = primMesh.coords[f.v3];
-
-                    int resultIndex = i * 3;
-                    result[resultIndex] = f.v1;
-                    result[resultIndex + 1] = f.v2;
-                    result[resultIndex + 2] = f.v3;
-                }
-            }
             return result;
         }
 
@@ -226,6 +189,9 @@ namespace OpenSim.Region.Physics.Meshing
         /// <returns></returns>
         public int[] getIndexListAsIntLocked()
         {
+            if (pinnedIndex.IsAllocated)
+                return (int[])(pinnedIndex.Target);
+        
             int[] result = getIndexListAsInt();
             pinnedIndex = GCHandle.Alloc(result, GCHandleType.Pinned);
 
@@ -245,11 +211,13 @@ namespace OpenSim.Region.Physics.Meshing
         {
             triangles = null;
             vertices = null;
-            primMesh = null;
         }
 
         public void Append(IMesh newMesh)
         {
+            if (pinnedIndex.IsAllocated || pinnedVirtexes.IsAllocated)
+                throw new NotSupportedException("Attempt to Append to a pinned Mesh");
+        
             if (!(newMesh is Mesh))
                 return;
 
@@ -260,6 +228,9 @@ namespace OpenSim.Region.Physics.Meshing
         // Do a linear transformation of  mesh.
         public void TransformLinear(float[,] matrix, float[] offset)
         {
+            if (pinnedIndex.IsAllocated || pinnedVirtexes.IsAllocated)
+                throw new NotSupportedException("Attempt to TransformLinear a pinned Mesh");
+        
             foreach (Vertex v in vertices.Keys)
             {
                 if (v == null)

OpenSim/Region/Physics/Meshing/Meshmerizer.cs

@@ -76,6 +76,7 @@ namespace OpenSim.Region.Physics.Meshing
 
         private float minSizeForComplexMesh = 0.2f; // prims with all dimensions smaller than this will have a bounding box mesh
 
+        private Dictionary<ulong, Mesh> m_uniqueMeshes = new Dictionary<ulong, Mesh>();
 
         /// <summary>
         /// creates a simple box mesh of the specified size. This mesh is of very low vertex count and may
@@ -170,9 +171,62 @@ namespace OpenSim.Region.Physics.Meshing
 
         }
 
-        public Mesh CreateMeshFromPrimMesher(string primName, PrimitiveBaseShape primShape, PhysicsVector size, float lod)
+        private ulong GetMeshKey( PrimitiveBaseShape pbs, PhysicsVector size, float lod )
+        {
+            ulong hash = 5381;
+
+            hash = djb2(hash, pbs.PathCurve);
+            hash = djb2(hash, (byte)((byte)pbs.HollowShape | (byte)pbs.ProfileShape));
+            hash = djb2(hash, pbs.PathBegin);
+            hash = djb2(hash, pbs.PathEnd);
+            hash = djb2(hash, pbs.PathScaleX);
+            hash = djb2(hash, pbs.PathScaleY);
+            hash = djb2(hash, pbs.PathShearX);
+            hash = djb2(hash, pbs.PathShearY);
+            hash = djb2(hash, (byte)pbs.PathTwist);
+            hash = djb2(hash, (byte)pbs.PathTwistBegin);
+            hash = djb2(hash, (byte)pbs.PathRadiusOffset);
+            hash = djb2(hash, (byte)pbs.PathTaperX);
+            hash = djb2(hash, (byte)pbs.PathTaperY);
+            hash = djb2(hash, pbs.PathRevolutions);
+            hash = djb2(hash, (byte)pbs.PathSkew);
+            hash = djb2(hash, pbs.ProfileBegin);
+            hash = djb2(hash, pbs.ProfileEnd);
+            hash = djb2(hash, pbs.ProfileHollow);
+
+            // TODO: Separate scale out from the primitive shape data (after
+            // scaling is supported at the physics engine level)
+            byte[] scaleBytes = size.GetBytes();
+            for (int i = 0; i < scaleBytes.Length; i++)
+                hash = djb2(hash, scaleBytes[i]);
+
+            // Include LOD in hash, accounting for endianness
+            byte[] lodBytes = new byte[4];
+            Buffer.BlockCopy(BitConverter.GetBytes(lod), 0, lodBytes, 0, 4);
+            if (!BitConverter.IsLittleEndian)
+            {
+                Array.Reverse(lodBytes, 0, 4);
+            }
+            for (int i = 0; i < lodBytes.Length; i++)
+                hash = djb2(hash, lodBytes[i]);
+
+            return hash;
+        }
+
+        private ulong djb2(ulong hash, byte c)
+        {
+            return ((hash << 5) + hash) + (ulong)c;
+        }
+
+        private ulong djb2(ulong hash, ushort c)
+        {
+            hash = ((hash << 5) + hash) + (ulong)((byte)c);
+            return ((hash << 5) + hash) + (ulong)(c >> 8);
+        }
+        
+
+        private Mesh CreateMeshFromPrimMesher(string primName, PrimitiveBaseShape primShape, PhysicsVector size, float lod)
         {
-            Mesh mesh = new Mesh();
             PrimMesh primMesh;
             PrimMesher.SculptMesh sculptMesh;
 
@@ -385,8 +439,6 @@ namespace OpenSim.Region.Physics.Meshing
 
                 coords = primMesh.coords;
                 faces = primMesh.faces;
-
-
             }
 
 
@@ -401,13 +453,13 @@ namespace OpenSim.Region.Physics.Meshing
                 vertices.Add(new Vertex(c.X, c.Y, c.Z));
             }
 
+            Mesh mesh = new Mesh();
             // Add the corresponding triangles to the mesh
             for (int i = 0; i < numFaces; i++)
             {
                 Face f = faces[i];
                 mesh.Add(new Triangle(vertices[f.v1], vertices[f.v2], vertices[f.v3]));
             }
-
             return mesh;
         }
 
@@ -418,7 +470,12 @@ namespace OpenSim.Region.Physics.Meshing
 
         public IMesh CreateMesh(String primName, PrimitiveBaseShape primShape, PhysicsVector size, float lod, bool isPhysical)
         {
+            // If this mesh has been created already, return it instead of creating another copy
+            // For large regions with 100k+ prims and hundreds of copies of each, this can save a GB or more of memory
+            ulong key = GetMeshKey(primShape, size, lod);
             Mesh mesh = null;
+            if (m_uniqueMeshes.TryGetValue(key, out mesh))
+                return mesh;
 
             if (size.X < 0.01f) size.X = 0.01f;
             if (size.Y < 0.01f) size.Y = 0.01f;
@@ -441,7 +498,7 @@ namespace OpenSim.Region.Physics.Meshing
                 // trim the vertex and triangle lists to free up memory
                 mesh.TrimExcess();
             }
-
+            m_uniqueMeshes.Add(key, mesh);
             return mesh;
         }
     }

OpenSim/Region/Physics/OdePlugin/ODEPrim.cs

@@ -82,7 +82,6 @@ namespace OpenSim.Region.Physics.OdePlugin
 
         // private float m_tensor = 5f;
         private int body_autodisable_frames = 20;
-        private IMesh primMesh = null;
 
 
         private const CollisionCategories m_default_collisionFlags = (CollisionCategories.Geom
@@ -814,14 +813,10 @@ namespace OpenSim.Region.Physics.OdePlugin
                 }
             }
 
-            IMesh oldMesh = primMesh;
+            float[] vertexList = mesh.getVertexListAsFloatLocked(); // Note, that vertextList is pinned in memory
+            int[] indexList = mesh.getIndexListAsIntLocked(); // Also pinned, needs release after usage
 
-            primMesh = mesh;
+            mesh.releaseSourceMeshData(); // free up the original mesh data to save memory
-
-            float[] vertexList = primMesh.getVertexListAsFloatLocked(); // Note, that vertextList is pinned in memory
-            int[] indexList = primMesh.getIndexListAsIntLocked(); // Also pinned, needs release after usage
-
-            primMesh.releaseSourceMeshData(); // free up the original mesh data to save memory
 
             int VertexCount = vertexList.GetLength(0)/3;
             int IndexCount = indexList.GetLength(0);
@@ -847,12 +842,6 @@ namespace OpenSim.Region.Physics.OdePlugin
                 return;
             }
 
-            if (oldMesh != null)
-            {
-                oldMesh.releasePinned();
-                oldMesh = null;
-            }
-
            // if (IsPhysical && Body == (IntPtr) 0)
            // {
                 // Recreate the body