17-87

bi-directional reflectance distribution function (at a surface element of a medium, in a given direction, for a given direction of irradiation) [ρ(θi , θr, λ)]

function describing the change with angle of irradiation, θi, and angle of view, θr, of the quotient of the radiance of the surface element in the given direction of view at the given wavelength λ, dLr(θi , θr, λ), by the irradiance incident on the medium from the given direction of irradiation at the given wavelength, dEi(θi , λ):

       

Unit: sr-1

See also "radiance coefficient"

Abbreviation: "BRDF"

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