Crevices are where secondary lighting becomes tertiary and quaternary - in other words, multiple bounces, resulting in localized accentuation of the secondary lighting importance.

Shader GC increases the luminance in crevices and for realism purposes should not be used AT ALL with IDL, since it gives incorrect information to the lighting model, which being magnified in crevices creates an obvious "glow".

However, with no render GC, final gamma compensation must be addressed. Postwork is an option, but I found a compromise for P8. Using HSV ETM, a small amount of shader gamma, and reduced faked SSS (redness in darker areas), which I demonstrated in the P8SSL tutorial scene.

However, as much as we like that outcome, it doesn't hold a candle to PPro 2010 IDL + render GC.

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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)