is based on very latest subsurface scattering development. Advancements can be found on bidirectional surface scattering reflectance distribution functions (BSSRDF) used for radiance transfer and on new diffusion profiles to model multiple scattering. It requires no pre-computation (like old mental ray misss) while the light transport is not computed in image space (like MILA Scatter) performing importance sampling of the diffusion profile directly and so allowing for complete freedom in reflections/refractions and lens shaders.
All the complexity remains hidden into the shader as in general is a one-click skin setup with SSS layers automagically computed from a single diffuse texture. It can be used to model any surface that exhibits subsurface scattering and being extremily fast and accurate you'll simply over-employ it in a lot of situations where before was used simple lambert shading for increased realism.
can be used to compute multiple scattering. Volumetric gives a waxish look that can be useful for non-photorealistic stuff like cartoon style characters where it converges also faster. Directional is latest development on diffusion profiles for multi-scattering and it renders kick-ass realistic skin.
are used to model skin epidermis, dermis and subcutis. The three skin layers can be derived automatically from the diffuse color texture. While we have three layers to represent the skin only one single SSS call is performed for a fast and reliable workflow. Different layer weights can be used to accurately model a variety of materials and for simplicity of use have build-in energy conservation.
can be used on top of the SSS layers to implement skin surface lipids, that gives skin that oily reflective appearence. GGX distribution model, rough Fresnel attenuation and adaptive importance based sampling are used for super fast and consistent renderings where only one single reflection call is performed.
Not only skin
in fact the skin shader can be used to model a variety of materials that exhibits subsurface scattering. Fruits, plants, waxes, marbles, organic stuff like milk and chocolate can all be easily modeled with user friendly parameters.
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