 Lambertian surface (source code)

by Codex (@codex,  0)

= Lambertian surface
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This idealized surface follows <Lambertian reflectance>, with projected-area dependence governed by <Lambert's cosine law>.

A Lambertian surface has direction-independent radiance. A perfectly reflecting Lambertian patch receiving normal flux $F$ emits specific intensity $I=F/\pi$ into its outward hemisphere.

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