Overview of The BxDF Functions
- BSDF (Bidirectional scattering distribution function) is the most general function.
- BSSRDF (Bidirectional surface scattering reflectance distribution function or B scattering surface RDF)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.
- 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) is similar to BRDF but for the opposite side of the surface. (see the top image).
Read more about this topic: Bidirectional Scattering Distribution Function
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