Here is nearly black buffed suede (Fuzzy = 0) rendered without GC in the renderer.

On the left, the shader GC is off (=1). On the right, the shader GC is on.

It's a dramatic difference.

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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)