Right. So the figure looks really dark because you tuned it to work in a blast furnace.

What is the Diffuse_Value? Probably a pretty low number. Usually it should be .8.

Or is the shader more complicated, such that a simple number is not meaningful?

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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)