fix llGetCenterOfMass ( checked with ubitODE only)

OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs

@@ -4041,6 +4041,39 @@ namespace OpenSim.Region.Framework.Scenes
             return retmass;
         }
 
+        // center of mass of full object
+        public Vector3 GetCenterOfMass()
+        {
+            PhysicsActor pa = RootPart.PhysActor;
+
+            if(((RootPart.Flags & PrimFlags.Physics) !=0) && pa !=null)
+            {
+                // physics knows better about center of mass of physical prims
+                Vector3 tmp = pa.CenterOfMass;
+                return tmp;
+            }
+            
+            Vector3 Ptot = Vector3.Zero;
+            float totmass = 0f;
+            float m;
+
+            SceneObjectPart[] parts = m_parts.GetArray();
+            for (int i = 0; i < parts.Length; i++)
+            {
+                m = parts[i].GetMass();
+                Ptot += parts[i].GetPartCenterOfMass() * m;
+                totmass += m;
+            }
+
+            if (totmass == 0)
+                totmass = 0;
+            else
+                totmass = 1 / totmass;
+            Ptot *= totmass;
+
+            return Ptot;
+        }
+
         /// <summary>
         /// If the object is a sculpt/mesh, retrieve the mesh data for each part and reinsert it into each shape so that
         /// the physics engine can use it.

OpenSim/Region/Framework/Scenes/SceneObjectPart.cs

@@ -1865,7 +1865,7 @@ namespace OpenSim.Region.Framework.Scenes
             {
                 if ((!isPhantom || isPhysical || _VolumeDetectActive) && !ParentGroup.IsAttachment
                                                 && !(Shape.PathCurve == (byte)Extrusion.Flexible))
-                    AddToPhysics(isPhysical, isPhantom, building, true);
+                    AddToPhysics(isPhysical, isPhantom, building, isPhysical);
                 else
                     PhysActor = null; // just to be sure
             }
@@ -2308,7 +2308,7 @@ namespace OpenSim.Region.Framework.Scenes
              */
         }
 
-         public float GetMass()
+        public float GetMass()
         {
             PhysicsActor pa = PhysActor;
 
@@ -2318,6 +2318,40 @@ namespace OpenSim.Region.Framework.Scenes
                 return 0;
         }
 
+        public Vector3 GetCenterOfMass()
+        {
+            if (ParentGroup.RootPart == this)
+            {
+                if (ParentGroup.IsDeleted)
+                    return AbsolutePosition;
+                return ParentGroup.GetCenterOfMass();
+            }
+
+            PhysicsActor pa = PhysActor;
+
+            if (pa != null)
+            {
+                Vector3 tmp = pa.CenterOfMass;
+                return tmp;
+            }
+            else
+                return AbsolutePosition;
+        }
+
+        public Vector3 GetPartCenterOfMass()
+        {
+            PhysicsActor pa = PhysActor;
+
+            if (pa != null)
+            {
+                Vector3 tmp = pa.CenterOfMass;
+                return tmp;
+            }
+            else
+                return AbsolutePosition;
+        }
+
+
         public Vector3 GetForce()
         {
             return Force;
@@ -4802,7 +4836,7 @@ namespace OpenSim.Region.Framework.Scenes
                 {
                     Velocity = velocity;
                     AngularVelocity = rotationalVelocity;
-                    pa.Velocity = velocity;
+//                    pa.Velocity = velocity;
                     pa.RotationalVelocity = rotationalVelocity;
 
                     // if not vehicle and root part apply force and torque