Oren Nayar by Nicholas Breslow
Orren Nayar is a diffuse BRDF shading model with a roughness component.
High values give he surface a powdery,velvety look.
This shader adds the following options to the default Lambert Shading Options:
Maps the Oren-Nayar "rougness".
The diffuse component uses the Oren-Nayar shading model.
When Diffuse Roughness is 0.0 this is identical to classical Lambertian shading, but with higher values the surface gets a a more "powdery" look.
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