private void deletePhysicsElement()
 {
     if (staticPhysicsElement != null)
     {
         factory.DeleteStaticElement(staticPhysicsElement);
         staticPhysicsElement = null;
     }
     if (dynamicPhysicsElement != null)
     {
         factory.DeleteDynamicElement(dynamicPhysicsElement);
         dynamicPhysicsElement = null;
     }
 }
        private void deletePhysicsElement(MeshPhysicsElementFactory factory, WorldRendering.Entity ent)
        {
            var el = ent.get <MeshStaticPhysicsElement>();

            if (el != null)
            {
                factory.DeleteStaticElement(el);
            }
            ent.set <MeshStaticPhysicsElement>(null);
        }