Any way to simulate the Roughness feature in VrayMtl with the GPU renderer?

[Alex_M]

Hi,

I'm trying to do some interiors with GPU and I'm wondering if there's a way to simulate the "Roughness" feature of VrayMtl with GPU. I use Roughness mainly for wall plaster which is normally a very diffuse surface and benefits from the Roughness effect. Any workarounds?