bidirectional scatter distribution function (BSDF)

[7.2.2]

NOTE: This term was added in RP-16-17 Addendum 1.

The general mathematical function or matrix of data that describes the directional scattering of light by a surface or complex glazing system through both reflection and transmission across input and output angles.

In practice, this phenomenon is usually split into the reflected and transmitted components, which are quantified in a bidirectional reflectance distribution function (BRDF) and bidirectional transmittance distribution function (BTDF).

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