I imported a mesh from Maya that spans 4 UDIMs into Substance Painter. However, the layout has been redistributed and all the UV shells I made are in different places, but still spans the 4 UDIMS. I turned off auto-unwrap, thinking that it might be causing the issue, but now my mesh fails to load. Any advice or explanations would be appreciated.
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There seems to be a problem with your UVs when Painter doesn't import them. Maybe there are islands that span multiple UDIMs, but thats just a shot in the dark. What the exact problem is noone can tell without looking at your model directly.