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|year=1980|series=Radiation Scattering in Optical Systems
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</ref> 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''' ('''[[bidirectional reflectance distribution function]]''') and '''BTDF''' ('''bidirectional transmittance distribution function''').
[[Image:BSDF05 800.png|thumb|right|280px|BSDF: BRDF + BTDF]]
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