the physics engine keeps it's own data in memory for the collision mesh, so it's not easy to update the mesh every frame to match the mesh's animation.

It's preferable to transform the object dynamically in lua (or c++) instead of using bones animation and skinning.

Something like that :

   object = getObject("object") 
   object_startPos = getPosition(object)

   t = 0

   -- Scene update
   function onSceneUpdate()
       
      z =  math.cos(t*0.1)*2 -- move up and down
      setPosition(object, object_startPos + vec3(0, 0, z))
       
      t = t+1

   end

To apply it to multiple objects easily, you can use object programming : http://wiki.maratis3d.org/index.php?tit … ng_example