![]() For instance, the total surface reflectance of an object is given as so. However, it is basically the ratio of reflection that is specular and not diffuse. Specularity is not clearly defined in the Radiance reference manual. However, unlike the diffuse RGB reflectance, which can be estimated through greyscale charts and through calibration with macbethcal and a Macbeth ColourChecker, it is a bit harder to measure specularity and roughness. In Radiance, these values are measurable. Most 3D rendering programs have some sort of specularity and roughness parameter, but these are not necessarily linked back to a measurable physical property. Most Radiance material definitions require a specularity and roughness value to be set. Radiance specularity and roughness value examples Radiance specularity and roughness value examples
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