Now same thing, but IBL contrast = 1.

Now we see everything.

But is this how a human looks when lit only by ambient light in a dark room? Not at all. This is completely flat, like cartoon shading. I don't use this type of ambient setup because it is wrong. You might as well just set the ambient in the shader and not use IBL at all.

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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)