I want you to understand the "difference magnifier" node setup, M * Abs(a-b). It will be very useful in the future.

Using it, I can show you how two different node setups are virtually or actually identical.

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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)