Shading artifacts when using sheen

[lightwriter]

Hi there!

I'm trying to use sheen in order to mimic velvet, but something strange is happening. The square artifacts appear regardless of the roughness of the sheen layer. The objects have correct normals and geometry.
When I disable reflections in the lights parameters, the artifacts become less apparent, but still there.

What's going on?

P.S.: I'm using 3ds Max 2024 and Corona 10 Hotfix 2

[maru]

Is it the same in IR and production render? Asking because sometimes such squares may appear in IR since the information about lighting is not re-calculated. It should go away if you run production render or restart IR.

If it happens in both IR and production render, I would suggest sending us the scene at https://support.chaos.com/hc/en-us/requests/new so that we check what might be going on.

[lightwriter]

Is it the same in IR and production render? Asking because sometimes such squares may appear in IR since the information about lighting is not re-calculated. It should go away if you run production render or restart IR.

If it happens in both IR and production render, I would suggest sending us the scene at https://support.chaos.com/hc/en-us/requests/new so that we check what might be going on.

Yes, unfortunately I get the same results, even if I restart IR or run a production render.