Brought microfacet theory into graphics, with spectral Fresnel and a proper distinction between metals and dielectrics. The direct ancestor of every physically based shading model in use today.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
Colour is the family; a dashed line is the second member of it.
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This node
specializesis a specific case of Microfacet Modelfirst graphics-side instance of the framework
References
A Reflectance Model for Computer Graphics — Cook, Torrance — 1982 · link