(V-RAY) a black "stain" appears on my glass material when rendering



there’s a black “stain” that appears on my curtain glass wall when i render. i tried making the glass from scratch and rendered it again but the “stain” still appears. can someone tell me what the problem is? thanks


Can you post an image of the render and the model to we can see what the problem is?


this is the rendered image


Not able to tell sorry without seeing the faces/hidden geometry and materials on the model.


If you don’t want to share your entire model, copy only walls and I will investigate this case.


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