Hmmm - after seeing how many times the manual says "material group" instead of the simpler "material", I apologize and stand corrected.

I confess I've never read anything about materials in the manual. Believe it or not, it's true.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)