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双方向反射率分布関数
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Wikipedia definition
1. Bidirectional reflectance distribution function​The bidirectional reflectance distribution function (BRDF) is a four-dimensional function that defines how light is reflected at an opaque surface. The function takes an incoming light direction,, and outgoing direction,, both defined with respect to the surface normal, and returns the ratio of reflected radiance exiting along to the irradiance incident on the surface from direction .
Read “Bidirectional reflectance distribution function” on English Wikipedia
Read “双方向反射率分布関数” on Japanese Wikipedia
Read “Bidirectional reflectance distribution function” on DBpedia

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