refactor: centralize prim geom removal code from four places to one

OpenSim/Region/Physics/Manager/PhysicsScene.cs

@@ -86,6 +86,10 @@ namespace OpenSim.Region.Physics.Manager
 
         public abstract void RemoveAvatar(PhysicsActor actor);
 
+        /// <summary>
+        /// Remove a prim from the physics scene.
+        /// </summary>
+        /// <param name="prim"></param>
         public abstract void RemovePrim(PhysicsActor prim);
 
         public abstract PhysicsActor AddPrimShape(string primName, PrimitiveBaseShape pbs, Vector3 position,

OpenSim/Region/Physics/OdePlugin/ODEPrim.cs

@@ -1352,7 +1352,7 @@ Console.WriteLine("ZProcessTaints for " + Name);
         }
 
         /// <summary>
-        /// Create a geometry for the given mesh/shape in the given target space.
+        /// Create a geometry for the given mesh in the given target space.
         /// </summary>
         /// <param name="m_targetSpace"></param>
         /// <param name="mesh">If null, then a mesh is used that is based on the profile shape data.</param>
@@ -1436,6 +1436,36 @@ Console.WriteLine("CreateGeom:");
             }
         }
 
+        /// <summary>
+        /// Remove the existing geom from this prim.
+        /// </summary>
+        /// <param name="m_targetSpace"></param>
+        /// <param name="mesh">If null, then a mesh is used that is based on the profile shape data.</param>
+        /// <returns>true if the geom was successfully removed, false if it was already gone or the remove failed.</returns>
+        public bool RemoveGeom()
+        {
+            if (prim_geom != IntPtr.Zero)
+            {
+                try
+                {
+                    d.GeomDestroy(prim_geom);
+                    prim_geom = IntPtr.Zero;
+                }
+                catch (System.AccessViolationException)
+                {
+                    prim_geom = IntPtr.Zero;
+                    m_log.ErrorFormat("[PHYSICS]: PrimGeom dead for {0}", Name);
+                    return false;
+                }
+
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+
         public void changeadd(float timestep)
         {
             int[] iprimspaceArrItem = _parent_scene.calculateSpaceArrayItemFromPos(_position);
@@ -1880,19 +1910,8 @@ Console.WriteLine(" JointCreateFixed");
                 {
                     if (_pbs.SculptEntry && _parent_scene.meshSculptedPrim)
                     {
-                        if (prim_geom != IntPtr.Zero)
+                        RemoveGeom();
-                        {
+
-                            try
-                            {
-                                d.GeomDestroy(prim_geom);
-                                prim_geom = IntPtr.Zero;
-                            }
-                            catch (System.AccessViolationException)
-                            {
-                                prim_geom = IntPtr.Zero;
-                                m_log.ErrorFormat("[PHYSICS]: PrimGeom dead for {0}", Name);
-                            }
-                        }
 //Console.WriteLine("changePhysicsStatus for " + Name);
                         changeadd(2f);
                     }
@@ -1953,8 +1972,8 @@ Console.WriteLine(" JointCreateFixed");
                 d.SpaceRemove(m_targetSpace, prim_geom);
             }
 
-            d.GeomDestroy(prim_geom);
+            RemoveGeom();
-            prim_geom = IntPtr.Zero;
+
             // we don't need to do space calculation because the client sends a position update also.
 
             IMesh mesh = null;
@@ -2044,17 +2063,9 @@ Console.WriteLine(" JointCreateFixed");
                     disableBody();
                 }
             }
-            try
-            {
-                d.GeomDestroy(prim_geom);
-            }
-            catch (System.AccessViolationException)
-            {
-                prim_geom = IntPtr.Zero;
-                m_log.ErrorFormat("[PHYSICS]: PrimGeom dead for {0}", Name);
-            }
 
-            prim_geom = IntPtr.Zero;
+            RemoveGeom();
+
             // we don't need to do space calculation because the client sends a position update also.
             if (_size.X <= 0) _size.X = 0.01f;
             if (_size.Y <= 0) _size.Y = 0.01f;

OpenSim/Region/Physics/OdePlugin/OdeScene.cs

@@ -2094,6 +2094,8 @@ namespace OpenSim.Region.Physics.OdePlugin
 
         public override void RemovePrim(PhysicsActor prim)
         {
+            // As with all ODE physics operations, we don't remove the prim immediately but signal that it should be
+            // removed in the next physics simulate pass.
             if (prim is OdePrim)
             {
                 lock (OdeLock)
@@ -2169,24 +2171,12 @@ namespace OpenSim.Region.Physics.OdePlugin
                         //}
                         //}
                         //m_log.Warn(prim.prim_geom);
-                        try
+
-                        {
+                        if (!prim.RemoveGeom())
-                            if (prim.prim_geom != IntPtr.Zero)
+                            m_log.Warn("[PHYSICS]: Unable to remove prim from physics scene");
-                            {
+
-                                d.GeomDestroy(prim.prim_geom);
-                                prim.prim_geom = IntPtr.Zero;
-                            }
-                            else
-                            {
-                                m_log.Warn("[PHYSICS]: Unable to remove prim from physics scene");
-                            }
-                        }
-                        catch (AccessViolationException)
-                        {
-                            m_log.Info("[PHYSICS]: Couldn't remove prim from physics scene, it was already be removed.");
-                        }
                         lock (_prims)
-                        _prims.Remove(prim);
+                            _prims.Remove(prim);
 
                         //If there are no more geometries in the sub-space, we don't need it in the main space anymore
                         //if (d.SpaceGetNumGeoms(prim.m_targetSpace) == 0)