As an example of something you may not be aware of, consider the following x = AGC(Blend(a, b, f)) or x = Blend(AGC(a), AGC(b), f) One of these is identical to render GC, the other is not. Under specific circumstances, these two produce the same output, and in other cases produce diffrrent output. Whey they differ, one of them is identical to render gc and the other is not. Can you say which is identical to render GC? Forgive the typos, I am in Edgartown Martha's Vineyard oa sailboat and only have my ipad which is hard to type on.

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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)