UV unwrap out of UV space #108838
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Reference: blender/blender#108838
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System Information
Operating system: macOS-13.3.1-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M1 Max 1.2
Blender Version
Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-05-28 05:08, hash:
ab73a8abbabcWorked: (newest version of Blender that worked as expected)
Short description of error
When unwrapping a mesh element for the first time the island appears very large and way outside the UV area.
Exact steps for others to reproduce the error
Unwrap a mesh for the first time using 'UU' in UV editor. It creates an island off the UV space and often very large. This doesn't happen every time but about 50% of the time.
I'm not able to reproduce this using what I think is a similar model to yours. Please just attach a small .blend file with the bad object in question.
This file has 2 objects which were created by extruding single verts and adding a face. Shape 1 has a UV island that forms outside of the UV space and shape 2 doesn't create an island at all. The way the island appears is not consistent. Sometimes it is very large and way off the centre and other time, like this case, where it is just off the space.
Shape 1 is behaving for me, but Shape 2 does indeed not generate any UVs. It has some overlapping faces and constructing a similar object in Blender 3.3 LTS also fails to generate UVs. @Chris_Blackbourn want to take a look at all?
I removed the overlapping faces but still no UVs. Shape 1 gives me this.
If I duplicate the object the UVs are OK on the duplicate.
If I duplicate a face within the object and unwrap it seems OK.
But if I delete the new face and unwrap again it reverts back to it original behaviour.
Try moving the mesh up keeping the origin at the centre. The further up it is the further the UV island is offset from the UV space.
This time duplicating the face makes no difference.
Try this file.
So I think the second part is just a special case of #98240
I guess technically that bug is about Live Unwrap, whereas this is menu unwrap, but I think it's the same issue.
i.e. if a mesh has no boundary, e.g. the default cube, or a sphere, torus etc, then the current unwrap will fail with an error:
"Unwrap failed to solve 1 of 1 island(s), edge seams may need to be added"
Re:
Is it possible to retest this on the latest nightly? It's possible this was fixed with
e08dde04c1Retested with latest build and seems to be fixed. I will keep a lookout for it happening again.
OK, I'm going to go ahead and close this one then.
Feel free to add more info to #98240 ,
Or if it pops up again, re-open, or create a new issue.
OK, I'm going to go ahead and close this one then.
Feel free to add more info to #98240 ,
Or if it pops up again, re-open, or create a new issue.