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Bidirectional scattering distribution function

The definition of the BSDF is not well standardized. The term was probably introduced in 1980 by Bartell, Dereniak, and Wolfe. Most often it is used to name the general mathematical function which describes the way in which the light is scattered by a surface. However, in practice, this phenomenon is usually split into the reflected and transmitted components, which are then treated separately as BRDF and BTDF.

Overview of the BxDF functions
• BRDF (Bidirectional reflectance distribution function) is a simplified BSSRDF, assuming that light enters and leaves at the same point (see the image on the right). • BTDF (Bidirectional transmittance distribution function) describes the relation between outgoing radiance and the incident flux, including the phenomena like subsurface scattering (SSS). The BSSRDF describes how light is transported between any two rays that hit a surface. • BSSTDF (Bidirectional scattering-surface transmittance distribution function) is like BTDF but with subsurface scattering. • BSSDF (Bidirectional scattering-surface distribution function) is collectively defined by BSSTDF and BSSRDF. Also known as BSDF (Bidirectional scattering distribution function). ==See also==
Source: Wikipedia ↗
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