If the materials rendering part were integrated into the rendering pipeline as a standard thing that could be called with an API, that could be pretty good. Just pass along some info about the material and let it render like any other basic shader. But because it’s a post-processing shader that needs to analyze the entire image and work out materials on the fly to objects that have already been rendered, it murders the frame rate and can make mistakes on its guesses. There’s something legiyimately interesting burried in there, but this is the worst possible way to implement it.