" So are you saying that the reflection input's only purpose is legacy support for old pre-reflection firefly content?" No that's going too far. There's a proper way to use that input but SphereMap is not it.

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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)