TIL BRDF stands for Bidirectional Reflectance Distribution Function > [It] is a function of four real variables that defines how light is reflected at an opaq

TIL BRDF stands for Bidirectional Reflectance Distribution Function > [It] is a function of four real variables that defines how light is reflected at an opaque surface. [...] The function takes an incoming light direction, ωi, and outgoing direction, ωr (taken in a coordinate system where the surface normal n lies along the z-axis), and returns the ratio of reflected radiance exiting along ωr to the irradiance incident on the surface from direction ωi. Source: https://en.wikipedia.org/wiki/Bidirectional_reflectance_distribution_function https://en.wikipedia.org/wiki/Bidirectional_reflectance_dist...