cie

17-25-089

bi-directional reflectance distribution function

BRDF

function describing the change with direction of irradiation, (θi,ϕi), and direction of view, (θr,ϕr), of the radiance of a surface element (xr,yr) in a given direction of view at a given wavelength λ, , with respect to the irradiance incident on the medium from the given direction of irradiation at the given wavelength, :

Note 1 to entry: The bi-directional reflectance distribution function is expressed in steradian to the power minus one (sr−1).

Note 2 to entry: See also "radiance coefficient".

Note 3 to entry: This entry was numbered 17-87 and 17-109 in CIE S 017:2011.

Publication date: 2020-12
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