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I was really interested to read about their subsurface scattering model, but alas, it's like the only TODO in this whole thing.

Which is really saying something, there is an incredible wealth of information in here.

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That subsurface scattering model is not what you would use for skin, etc. It's a fairly simple approximation similar to what Unreal and Frostbite have used (use?) in the past to cheaply approximate somewhat translucent materials. It's mostly still a TODO because it's not that interesting.

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