Some Problematic Grey faces on Normal Map Bake, How can I fix?

New Here ,
Aug 09, 2021 Aug 09, 2021

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Hello everyone,

I am very new to Substance Painter and trying to learn following several tutorials, including the getting started video series. Today I did a fairly nice first trial with the things that I learned:


And then I passed to my "bigger" project, which is a bed, and actually everything was working nice till I realized some faces that looked darker on a footboard made by pipes. When I checked all the maps in Substance Painter, I realized that I have some grey rectangles which is corresponding to some faces with ngons. Here's a screenshot of the normal Map that I mean and a screenshot of the object:


As you can see, I have some grey faces on the normal map. I checked the blender file (modelled it in Blender) and there aren't double faces, nor double vertexes and face normals are all correct. Yes there are ngons on those surfaces, but there are other pretty identical surfaces on that UV Atlas without that grey face problem. Here you can see a wireframe of the areas:


Could you point me out what is the problem and how to solve it? I searched the Google but could not find any answer, so wanted to ask it here.


Thank you for your help.



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