This phenomenon can be modeled for surfaces with parallel grooves by a distribution named for Heidrich and Seidel. One model of this phenomenon uses the microfacet approach of Torrance and Sparrow to deal with surface roughness, which assumes the slopes of surface cavities follow a normal distribution. That formulation, due
This phenomenon can be modeled for surfaces with parallel grooves by a distribution named for Heidrich and Seidel. One model of this phenomenon uses the microfacet approach of Torrance and Sparrow to deal with surface roughness, which assumes the slopes of surface cavities follow a normal distribution. That formulation, due to Oren and Nayar, simplifies in the case of uniform facet slope to a an approximation that exhibits a radiant intensity proportional to the cosine of the angle between observer line of sight and surface normal. Certain "highlights" in this phenomenon were introduced by Phong, and the aforementioned model is called Lambertian. The previously described type of this phenomenon contrasts with the behavior of perfectly "glossy" surfaces where radiant intensity is nonzero at only one angle, called specular. For 10 points, name this phenomenon exhibited by mirrors.
This phenomenon can be modeled for surfaces with parallel grooves by a distribution named for Heidrich and Seidel.
{reflection}