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So far I have implemented a texture controlled approximation of heterogeneous subsurface scattering. Now I am working on a more accurate Finite Element solution based on the phd work of Adam Arbree.
Abstract:Many real world materials exhibit complex subsurface scattering of light. This internal light interaction creates the perception of translucency for the human visual system. Translucent materials and simulation of the subsurface scattering of light has become an expected necessity for generating warmth and realism in computer generated imagery. The light transport within heterogenous materials, such as marble, has proved challenging to model and render.