diff --git a/src/fgt/filter_physics/ODEFacade.cpp b/src/fgt/filter_physics/ODEFacade.cpp
index e4599598c..366d7a332 100644
--- a/src/fgt/filter_physics/ODEFacade.cpp
+++ b/src/fgt/filter_physics/ODEFacade.cpp
@@ -32,8 +32,8 @@ void ODEFacade::initialize(){
 
 void ODEFacade::clear(MeshDocument& md){
     for(MeshContainer::iterator i = m_registeredMeshes.begin(); i != m_registeredMeshes.end(); i++){
-        if(md.meshList.contains(i->first))
-            tri::Allocator<CMeshO>::DeletePerMeshAttribute(i->first->cm, "physicsID");
+        /*if(tri::HasPerMeshAttribute(i->first->cm, "physicsID"))
+            tri::Allocator<CMeshO>::DeletePerMeshAttribute(i->first->cm, "physicsID");*/
 
         dGeomDestroy(i->second->geom);
         if(i->second->body)
@@ -50,7 +50,7 @@ void ODEFacade::setGlobalForce(float force[3]){
 
 void ODEFacade::registerTriMesh(MeshModel& mesh, bool scenery){
     if(tri::HasPerMeshAttribute(mesh.cm, "physicsID"))
-        return;
+        tri::Allocator<CMeshO>::DeletePerMeshAttribute(mesh.cm, "physicsID");
 
     if(mesh.cm.Tr != vcg::Matrix44f::Identity()){
         vcg::tri::UpdatePosition<CMeshO>::Matrix(mesh.cm, mesh.cm.Tr);
diff --git a/src/fgt/filter_physics/RandomFillFilter.cpp b/src/fgt/filter_physics/RandomFillFilter.cpp
index 414a88bc2..3c7e47f0c 100644
--- a/src/fgt/filter_physics/RandomFillFilter.cpp
+++ b/src/fgt/filter_physics/RandomFillFilter.cpp
@@ -46,10 +46,15 @@ bool RandomFillFilter::applyFilter(QAction* filter, MeshDocument &md, RichParame
 
     srand((unsigned)time(0));
 
+    vcg::tri::UpdatePosition<CMeshO>::Matrix(filler->cm, filler->cm.Tr);
+    filler->cm.Tr.SetIdentity();
+
     tri::Inertia<CMeshO> inertiaContainer, inertiaFiller;
     inertiaContainer.Compute(par.getMesh("container")->cm);
     inertiaFiller.Compute(par.getMesh("filler")->cm);
+
     int objects = abs(inertiaContainer.Mass()/inertiaFiller.Mass())*par.getFloat("factor");
+    filler->cm.Tr.SetColumn(3, - inertiaFiller.CenterOfMass());
 
     if(par.getBool("useRandomVertices")){
         for(int i = 0; i < objects; i++){
@@ -74,6 +79,7 @@ bool RandomFillFilter::applyFilter(QAction* filter, MeshDocument &md, RichParame
     }
 
     m_engine.updateTransform();
+    filler->cm.Tr.SetIdentity();
 
     if(cb != 0) (*cb)(0, "Physics renderization of the scene completed...");
     return true;
@@ -91,5 +97,5 @@ void RandomFillFilter::addRandomObject(MeshDocument& md, MeshModel* filler, cons
     MeshModel* meshCopy = md.addNewMesh(meshName.str().c_str());
     vcg::tri::Append<CMeshO,CMeshO>::Mesh(meshCopy->cm, filler->cm, false, true);
     meshCopy->cm.Tr = filler->cm.Tr;
-    meshCopy->cm.Tr.SetColumn(3, origin);
+    meshCopy->cm.Tr.SetColumn(3, meshCopy->cm.Tr.GetColumn3(3) + origin);
 }