You may think that there ain't too much to say about diffuse shading, right ? Think again ! We propose half a dozen models to cover all your needs about lambertian substrates. We have even added an interfaced lambertian model that adds chromaticity variations based on the specular layer on top of it.
Key Features
Principled Shading
When we need to deal with diffuse roughness to increase backscattering while approaching ie. potteries, ceramic etc. the classic Oren-Nayar is not a great choice because it's based on single scattering microfacets and so it gets darker and darker the more we increase roughness. With a principled implementation instead we get nice roughness and back scattering ...
Smooth Diffuse
Here we approach analytically sparse sphere packing that happens in porous materials like dust sand powder soot etc. Having a certain appearance itself, it can be used anywhere we wanna approach a kind of look where diffuse appears flat and without too much shading itself. We use it for example for woods and as base for toon shading ...
Generalized Diffuse
This is the classic Oren-Nayar model that introduced a generalization of the Lambert model based on microfaceting to model a general roughness parameter. The problem with this is that the microfaceting is single scattering and so pushing too much roughness into the model it will unrealistically darken its whole appearance but with minor values it will play its part fairly ...
Rough Diffuse
Here we use a multi-scatter microfacet implementation for lambertian diffusion instead to go for the usual cosine hemispherical sampling. This comes at a expense of having a little longer render times but backscattering quality is unmatched compared to any other diffuse model. Great for potteries, walls etc ...
Interfaced Lambert
This model accounts also for the transmission at the interface and not only for the Fresnel reflection. It's intuitive to see that if we have a physical layer above our diffuse layer when light passes through .. well the transmission factor should also be accounted for because if we see the diffuse component, it means the specular layer on top is of course transparent ...
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