Directional-hemispherical reflectance

Directional-hemispherical reflectance is the reflectance of a surface under direct illumination (with no diffuse component). Directional-hemispherical reflectance is the integral of the bidirectional reflectance distribution function over all viewing directions. It is sometimes called "black-sky albedo".

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Uses material from the Wikipedia article Directional-hemispherical reflectance, released under the CC BY-SA 4.0 license.