Every time we get into a GC understanding discussion, the person I'm dealing with goes off and does hour-long renders. You don't need to do that. Is that what you're doing? While I was waiting for a response, I did 30 renders with GC off, GC=1 and GC=2.2. Want to see some?

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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)