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there! I was finishing my first 3D model and when I was working on it's roughness, I've noticed these weird black lines (formed by black dots). I've tried changing ambient occlusion margin and shaping its UV map. Do you know anyway to fix this? UPD: Looks like it is actually a normal map what is causing the problem

Black lines enter image description here

UV map of these parts enter image description here

With normal map enter image description here

Without normal map enter image description here

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Alright, it seems like I've found a solution to my problem. Basically: there were small odd pixels on my normal map that caused those black lines/dots to appear. So I've "fixed" the map in photoshop by using "Stamp" tool and coloring those pixels. It seemed to fix the problem.

"Weird pixels" (cyan pixels among the purple) enter image description here

After clean up enter image description here

Overall result enter image description here

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