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Reflections

Vignettes can be authored to include near-3D reflection data.
If so authored, the following material attributes are used to define the material's reflective surface properties:
Attribute
Description
Default
Surface glossiness
From vignette
Gloss variation (gray-scale image)
None
Surface roughness
40%
Material type
0 (unknown)
The renderer adjusts the range of the gloss= and rough= attribute according to type= . Some material types such as fabric are generally less reflective than material types such as stone or metal, and the same amount of gloss specified for one will result in a different reflection effect than the other. gloss= and roughness have a fairly wide gamut if type= is not specified or is set to 0.
glossmap= can be used to control the glossiness of a material on a pixel-by-pixel basis.