Hello, I have to perform transformations to a mesh, and it's necessary for me to get the mesh world matrix before each transformations. But once a transformation is performed, all my world matrix copies are amended ... In the fiddle undermentioned I don't understand why if we remove a line relative to a transformation, for exemple the l.16: box.rotation.y = Math.PI/3;, all the world matrix are amended ... to become identical ... I can only get the transform Matrix Before and after all my transformations. So is it possible to get this world matrix at each moment of the mesh position evolution ? The fiddle : http://jsfiddle.net/BluePampa/f8LRR/ Thanks !