Specular Highlight - Models of Microfacets

Models of Microfacets

A number of different models exist to predict the distribution of microfacets. Most assume that the microfacet normals are distributed evenly around the normal; these models are called isotropic. If microfacets are distributed with a preference for a certain direction along the surface, the distribution is anisotropic.

NOTE: In most equations, when it says it means

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