public static void clonegeom(ref Geom newgeom, ref Geom oldgeom)
{
newgeom.Id = Geom.GetNextId();
newgeom.RestitutionCoefficient = oldgeom.RestitutionCoefficient;
newgeom.FrictionCoefficient = oldgeom.FrictionCoefficient;
newgeom.GridCellSize = oldgeom.GridCellSize;
newgeom.CollisionGroup = oldgeom.CollisionGroup;
newgeom.CollisionEnabled = oldgeom.CollisionEnabled;
newgeom.CollisionResponseEnabled = oldgeom.CollisionResponseEnabled;
newgeom.CollisionCategories = oldgeom.CollisionCategories;
newgeom.CollidesWith = oldgeom.CollidesWith;
newgeom.SetVertices(oldgeom.LocalVertices);
DistanceGrid.Instance.CreateDistanceGrid(newgeom);
}