Smooth Polygons is often the culprit on the GI artifacts. Needs a little work there - it's the classiic REYES self-shadowing problem. There's no Min Bias parameter for GI - we need one.

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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)