* Moves the Meshmerizer to a separate plugin

* Experimental.   Linux Prebuild needs testing.
* One more update after this to remove the ODEMeshing directory....

OpenSim/Region/Physics/Meshing/Extruder.cs

@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenSim.Region.Physics.Meshing
+{
+    class Extruder
+    {
+        public float startParameter;
+        public float stopParameter;
+        public Manager.PhysicsVector size;
+
+        public Mesh Extrude(Mesh m)
+        {
+            // Currently only works for iSteps=1;
+            Mesh result = new Mesh();
+
+            Mesh workingPlus  = m.Clone();
+            Mesh workingMinus = m.Clone();
+
+            foreach (Vertex v in workingPlus.vertices)
+            {
+                if (v == null)
+                    continue;
+
+                v.Z = +.5f;
+                v.X *= size.X;
+                v.Y *= size.Y;
+                v.Z *= size.Z;
+            }
+
+            foreach (Vertex v in workingMinus.vertices)
+            {
+                if (v == null)
+                    continue;
+
+                v.Z = -.5f;
+                v.X *= size.X;
+                v.Y *= size.Y;
+                v.Z *= size.Z;
+            }
+
+            foreach (Triangle t in workingMinus.triangles)
+            {
+                t.invertNormal();
+            }
+
+            result.Append(workingMinus);
+            result.Append(workingPlus);
+
+            int iLastNull = 0;
+            for (int i = 0; i < workingPlus.vertices.Count; i++)
+            {
+                int iNext = (i + 1);
+                
+                if (workingPlus.vertices[i] == null) // Can't make a simplex here
+                {
+                    iLastNull = i+1;
+                    continue;
+                }
+
+                if (i == workingPlus.vertices.Count-1) // End of list
+                {
+                    iNext = iLastNull;
+                }
+
+                if (workingPlus.vertices[iNext] == null) // Null means wrap to begin of last segment
+                {
+                    iNext = iLastNull;
+                }
+
+                Triangle tSide;
+                tSide = new Triangle(workingPlus.vertices[i], workingMinus.vertices[i], workingPlus.vertices[iNext]);
+                result.Add(tSide);
+
+                tSide = new Triangle(workingPlus.vertices[iNext], workingMinus.vertices[i], workingMinus.vertices[iNext]);
+                result.Add(tSide);
+            }
+
+            return result;
+        }
+    }
+}