I have a weird problem, on my scene when I render the RC object in Vray CPU eveything is correct, mesh and material : render is matching the viewport.
When I render the same thing with Vray GPU some panels are strangely switching materials ID (from 1 to 2 in this exemple) : see the attached JPEG. I know that because when I convert the RC object in Mesh the problem occurs again and I can see that its switching mat ID.
It's very annoying considering I'm supposed to render the scene with GPU for time management.
3DS MAX 2019
Vray Next v2
RailClone v 4.1
Do you have any solution to this problem ?