It appears that roughness is broken in the VrayMtl for Vray 3.5 in Maya 2017. When roughness is set to 1 on a VrayMtl, the diffuse shading becomes binary, like a two-tone cartoon render where it is either 100% lit or 100% unlit. This can be seen in the attached image, comparing roughness in Arnold and Vray.
I have tested the same scene in Maya 2015 with Vray 3.4 and there the roughness works fine, so I suspect it is a problem with Vray 3.5 in particular.
I have tested the same scene in Maya 2015 with Vray 3.4 and there the roughness works fine, so I suspect it is a problem with Vray 3.5 in particular.
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