Render+ materials

Hello, I kindly ask for help… everything was fine when I was rendering in V-Ray, and then all of a sudden, one day this (in the picture) started appearing when I render. What happened? It’s strange because I don’t have this problem with other rooms… only with the living room, kitchen, and walls. Does anyone know what the problem could be? I would be very grateful for any help. I haven’t changed any materials or settings. ( Iam sending before after photo )


Can you post a screenshot of your rendering settings? Are you sure nothing at all was changed between renders? Example sometimes switching between GPU and CPU, although you’re on a mac so you should be using CPU only. Have you also switched your model to ‘monochrome’ mode to enure there are no reversed faces?