From the Vray RT section of the manual:
I'm really trying to push toward a GPU-based workflow, and some of these unsupported material features (SS, refraction fog) are my biggest hurdle at the moment.
Something not listed above that also seems to be unsupported is blurred refraction, i.e. Refraction Glossiness values below 1.0. This setting has no effect for me in RT, and is a total deal breaker for RT given the kinds of materials I'm working with.
The following VRayMTL features are not supported in RT GPU: self-illumination, refraction fog, dispersion, roughness and subsurface scattering
Something not listed above that also seems to be unsupported is blurred refraction, i.e. Refraction Glossiness values below 1.0. This setting has no effect for me in RT, and is a total deal breaker for RT given the kinds of materials I'm working with.
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