And here is with shader GC disabled, and render GC enabled.

The skin is identical, including the luminance of the shadowed areas. Meanwhile, the effect of GC, which was not provided on any other parts, has changed everything else.

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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)