To answer your original question, V-Ray RT does use multiple importance sampling very heavily, both on the CPU and on the GPU.
As for why this particular scene comes out noisier, I’m not sure - will look into it.
Best regards,
Vlado
To answer your original question, V-Ray RT does use multiple importance sampling very heavily, both on the CPU and on the GPU.
As for why this particular scene comes out noisier, I’m not sure - will look into it.
Best regards,
Vlado