Hi Nicolas, If I understand what you are saying, for each "dirty" of your interest, you would like to capture and store that as soon as it happens and compare it with last render event to process the delta change. And right now you the challenge that you are faced with is capturing the "dirties", specially with the material assignment.
But isn't it true that Joe's proposal lets you visit the scene graph to capture the scene graph changes at each render, still doing the same thing but with a different approach. Please correct me if I am wrong. Alok.
