my render shows black areas. someone can help me?In addition, the picture on the wall is stretched
It's the thickness of the surfaces. I've run into the same issues when rendering surfaces. Thicken them up by something like a 16th of an inch and it typically goes away. This may depend on the complexity of your model or the overall size so play with the thicknesses and eventually, you'll find the magic number for your case.
perfect, solved. thank you
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