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UV unwrap out of UV space #108838

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opened 2023-06-10 12:02:49 +02:00 by Ian Jones · 15 comments
Ian Jones commented 2023-06-10 12:02:49 +02:00
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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: ab73a8abbabc
Worked: (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.

**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: `ab73a8abbabc` Worked: (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.
UV off centre.mov
13 MiB
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 labels 2023-06-10 12:02:49 +02:00
Jesse Yurkovich commented 2023-06-10 21:09:26 +02:00
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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.

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.
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Ian Jones commented 2023-06-11 00:18:25 +02:00
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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.

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.
UV Bug.blend
2.6 MiB
Jesse Yurkovich commented 2023-06-11 02:17:15 +02:00
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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?

image

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? ![image](/attachments/c50e9005-fbfb-494a-b4fb-6777ec98ae5e)
image.png
363 KiB
Jesse Yurkovich added
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 labels 2023-06-11 02:17:24 +02:00
Ian Jones commented 2023-06-11 02:21:25 +02:00
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I removed the overlapping faces but still no UVs. Shape 1 gives me this.

I removed the overlapping faces but still no UVs. Shape 1 gives me this.
Screenshot 2023-06-11 at 01.19.05.png
9.1 MiB
Screenshot 2023-06-11 at 01.19.05.png
Ian Jones commented 2023-06-11 02:24:32 +02:00
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If I duplicate the object the UVs are OK on the duplicate.

If I duplicate the object the UVs are OK on the duplicate.
Ian Jones commented 2023-06-11 02:26:58 +02:00
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If I duplicate a face within the object and unwrap it seems OK.

If I duplicate a face within the object and unwrap it seems OK.
Ian Jones commented 2023-06-11 02:27:21 +02:00
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No description provided.
Screenshot 2023-06-11 at 01.26.07.png
5.6 MiB
Screenshot 2023-06-11 at 01.26.07.png
Ian Jones commented 2023-06-11 02:28:51 +02:00
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But if I delete the new face and unwrap again it reverts back to it original behaviour.

But if I delete the new face and unwrap again it reverts back to it original behaviour.
Ian Jones commented 2023-06-11 02:35:38 +02:00
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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.

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.
Screenshot 2023-06-11 at 01.33.52.png
9.5 MiB
Screenshot 2023-06-11 at 01.33.52.png
Ian Jones commented 2023-06-11 02:36:45 +02:00
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This time duplicating the face makes no difference.

This time duplicating the face makes no difference.
Chris Blackbourn added the
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 label 2023-06-11 02:39:28 +02:00
Ian Jones commented 2023-06-11 02:40:28 +02:00
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Try this file.

Try this file.
UV Bug 2.blend
2.6 MiB
Chris Blackbourn commented 2023-06-11 02:43:41 +02:00
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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:

Shape 1 has a UV island that forms outside of the UV space

Is it possible to retest this on the latest nightly? It's possible this was fixed with e08dde04c1

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: > Shape 1 has a UV island that forms outside of the UV space Is it possible to retest this on the latest nightly? It's possible this was fixed with e08dde04c195e71b77d69ca132398d109b7805b1
Ian Jones commented 2023-06-11 02:51:32 +02:00
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Retested with latest build and seems to be fixed. I will keep a lookout for it happening again.

Retested with latest build and seems to be fixed. I will keep a lookout for it happening again.
Chris Blackbourn commented 2023-06-12 22:49:49 +02:00
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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.
Chris Blackbourn commented 2023-06-12 22:49:52 +02:00
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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.
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Reference: blender/blender#108838
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