How to use roughness?
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How can I use the roughness option in the materials tab? How is the numerical value entered in it?
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I'm only a novice at Vray, but it seems that the only way to get a numerical value for the roughness is to create a new "Vray material" from scratch. Here's the manual description of how to control it:
https://docs.chaosgroup.com/display/VRAY2SKETCHUP/VRayMtl#VRayMtl-Diffuse
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