The diffusion of light within the
top layer of the skin.
The important effects of subsurface scattering are very difficult to see until they are absent, and it becomes obvious that “something is missing”. Therefor this effect is very easy to overdo and to put too strong an sss effects in a
renderings an apparent “softening” of bumps and small structures, and a small “bleed” of light into shadow areas, diffusing the otherwise sharp shadow edges
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