Spatially Variable Specularity


Is it possible to define a material with spatially variable specularity and/or roughness values using a texture map?


Hi tmux,

while the use of specularity/diffuse/roughness/normal maps etc. is commin in computer graphics, Radiance offers only limited support for such techniques. Maybe the best you can get is to define two basic materials of different specularity and roughness, and blend them using mixfunc or mixpict. An example for this is on Dion’s page on modelling vegetation - here he is switching opaque areas and gaps though: Creating grass and plants in Radiance

Best, Lars.

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