Need material id maps.

[malcolm341]

Hi, could you please implement material id maps. I've tried the label system, but one it doesn't allow me to assign a separate material to the label, and two my label has more than one material defined on it by a texture. For example, I want to plug in an albedo texture, then use a coloured mask file where each colour in the mask uses a specific material.

As test case I have a glass bottle, it has a bump map on it, a printed label, and then the lablel has a couple different materials on it, paper with a plastic coating, metalic printed letters, some areas that are matte paper for example. In the current system I can't find a way to make this object work and I think the easiest solution would be to read in an arbitrary id map the user creates and then each colour in the map you can plug a different material into.