Vray 3.40.03 for Rhino

[MarwaAvraam]

I'm using Vray 3.4 for Rhino and recently I've been facing an issue with renders.

Black circles appears on different surfaces (Wall, Glass, Wood, Metal) please note that I have no overlapping geometries and I use the same settings for the past 3 months and never faced something like this.

I would appreciate a prompt response that guides me to a solution.

[mgibeault]

Looks like a meshing problem...

[Peter.Chaushev]

I concur. It does appear like a meshing problem. You can confirm this by doing a test render with Material Override enabled.
To fix this, you would need to remodel or adjust the affected polygons.

Furthermore, I would strongly recommend updating to v3.60.02.

Kind regards,
Peter