Interreflections with rough surfaces

Interreflections are an important visual effect that needs to be accounted for in any endeavour that exploits photometry and radiometry, such as shape from shading and color constancy. Previous work on interreflections has considered pure nonrough Lambertian reflection only, and this is a crude approximation to the physics of light reflection. In this paper we derive an interreflection model that accounts for the roughness of surfaces, and show how this roughness parameter affects the loci of contributing points from each of the surfaces of two interreflecting planes.