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= Bidirectional reflectance distribution function = [[File:BRDF_Diagram.svg|thumb|right|300px|Diagram showing vectors used to define the [[w:Bidirectional reflectance distribution function|w:BRDF]].]] {{Q|The '''bidirectional reflectance distribution function''' ('''BRDF''') is a function of four real variables that defines how light is reflected at an [[w:Opacity (optics)|opaque]] surface. It is employed in the [[w:optics|optics]] of real-world light, in [[w:computer graphics|computer graphics]] algorithms, and in [[w:computer vision|computer vision]] algorithms.|Wikipedia|[[w:bidirectional reflectance distribution function|BRDF]]}} A BRDF model is a 7 dimensional model containing geometry, textures and reflectance of the subject. The seven dimensions of the BRDF model are as follows: * 3 cartesian X,Y,Z * 2 for the entry angle * 2 for the exit angle of the light. See '''[[wikidata:Q856980]]''' for translations, descriptions and links to WMF wikis about BRDF. ----
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