Here is the material I made for the fire. The color map looks like it's mostly black, but it actually is not totally black. So I used a subtract function to bring some of the levels down so the dark areas are at or below zero.

Then I ran that into a Bias, to shift the mid tones brighter. The result (Math_Functions_2) shows the dynamically created transmap. Neat huh?

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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)