Trying to help @SuperPudding in this topic I created some code to show that my answers still worked. The code worked so I copied the relevant parts to the playground where it failed and got something like SuperPudding was detailing. Any explanations gratefully received. This is the playground http://www.babylonjs-playground.com/#YEKUO  that does not work. Check console for error messages. The code below works for me. You should get a red box on top of a blue box if you copy,