I have a question. Does anyone know if there is an extension or an option within sketchup that allows you to see what materials that you have not used already? I think this would help me out a ton when I am importing my models into lumion. I would be able to search through materials that I have not already used in sketchup so that I do not waste any of my time. I would love to go through a large model and only have to texture all of my materials once.