Skin Rendering

A lot of hacking, little math, low-cost method.

Could easily be insert into almost all pipeline (Forward or deferred)

Approximate real-skin with the cost of only a few additional textures(two LUT texture, one blurred normal map)

Almost no additional compute cost at runtime(relative to separable SSS or sampling method)

Here I used a compute shader to compute the LUT of skin shading before the rendering loop.

And a pre-computed curvature map of the head model is used to look up from the LUT.

The final normal dot light vector calculation used different normals for RGB channel (Used two normal texture, original and blurred, for interpolation)

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