UV unwrap: pinning faces in an island causes other islands to have the wrong scale and fill the whole map #71254

New Issue

Ethical Vegan · 2019-10-31T23:19:11+01:00

Ethical Vegan commented

2019-10-31 23:19:11 +01:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.97

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449
Worked: 2.79

Short description of error
When unwrapping, if you pin some faces in an island, then the other islands will not be in the same scale anymore, they will fill the whole map instead of remaining in the same scale.

Exact steps for others to reproduce the error

before unwrapping any object, add some seams around a few faces so that this area will have its own small island in the UV map
unwrap the object. You should now have a main island, and a small island in the UV map
pin a few faces of the main island in the UV map
unwrap the object again. Now the small island will fill the whole map or be way too large, instead of remaining in the correct scale.

I tried in Blender 2.81, and the problem is still there.

Steps to reproduce

Open file
In UV editor, pin selected vertex
select all vertices and unwrap

Island will fill the whole map

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.97 **Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: `f6cb5f5449` Worked: 2.79 **Short description of error** When unwrapping, if you pin some faces in an island, then the other islands will not be in the same scale anymore, they will fill the whole map instead of remaining in the same scale. **Exact steps for others to reproduce the error** - before unwrapping any object, add some seams around a few faces so that this area will have its own small island in the UV map - unwrap the object. You should now have a main island, and a small island in the UV map - pin a few faces of the main island in the UV map - unwrap the object again. Now the small island will fill the whole map or be way too large, instead of remaining in the correct scale. I tried in Blender 2.81, and the problem is still there. **Steps to reproduce** * Open file * In UV editor, pin selected vertex * select all vertices and unwrap Island will fill the whole map

71254.blend

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Ethical Vegan commented

2019-10-31 23:19:11 +01:00

Added subscriber: @EthicalVegan

Ethical Vegan commented

2019-10-31 23:42:01 +01:00

Removed subscriber: @EthicalVegan

Ethical Vegan commented

2019-10-31 23:43:40 +01:00

Added subscriber: @EthicalVegan

Daniel Bystedt commented

2019-11-07 00:04:36 +01:00

Added subscriber: @DanielBystedt

Daniel Bystedt commented

2019-11-07 00:04:36 +01:00

I get the same behavior as described above.

Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-11-05 18:12, hash: 0bee94f920

I get the same behavior as described above. Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-11-05 18:12, hash: `0bee94f920` ![pin and unwrap.png](https://archive.blender.org/developer/F7966970/pin_and_unwrap.png)

Richard Antalik commented

2020-01-15 20:30:06 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-01-15 20:30:06 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Richard Antalik commented

2020-01-15 20:30:06 +01:00

Is this still an issue with latest build? https://builder.blender.org/download/

There was some fix, should be applicable to this issue.

Is this still an issue with latest build? https://builder.blender.org/download/ There was some fix, should be applicable to this issue.

Richard Antalik commented

2020-01-23 01:54:51 +01:00

Changed status from 'Needs User Info' to: 'Archived'

Richard Antalik closed this issue

2020-01-23 01:54:51 +01:00

Richard Antalik self-assigned this 2020-01-23 01:54:51 +01:00

Richard Antalik commented

2020-01-23 01:54:51 +01:00

Since last asking for information it has been 7 or more days, due to the policy of our bug tracker we will have to close the report.

Ethical Vegan reopened this issue

2023-02-10 19:54:55 +01:00

Blender Bot added

and removed

labels 2023-02-10 19:54:56 +01:00

Ethical Vegan commented

2023-02-10 20:15:12 +01:00

The issue is still present in Blender 3.4.1

Easy steps for others to reproduce the error:

select the cube, then go to Edit Mode
select those vertices
in the top menu, select {UV -> Mark Seam}
in the top menu, select {UV -> Unwrap}

Note: in the UV Editor window, you can now see 2 islands (the small square in the bottom right is a small island

select a vertex on the big island, then in the top menu select {UV -> Pin}
in the Edit Mode window, unwrap the mesh again {UV -> Unwrap}
Now the small island, which was the square in the bottom right, fills the whole map instead of remaining in the correct scale

The issue is still present in Blender 3.4.1 Easy steps for others to reproduce the error: 1. select the cube, then go to Edit Mode 2. select those vertices ![1.png](/attachments/040f8c3c-1e04-4b84-8c01-556d77d2c4e0) 3. in the top menu, select {UV -> Mark Seam} ![2.png](/attachments/b0f37b11-61ae-468e-9268-eda6b5ced060) 4. in the top menu, select {UV -> Unwrap} ![3.png](/attachments/22f0c5bc-e2fe-49da-821e-89bfe73f598e) Note: in the UV Editor window, you can now see 2 islands (the small square in the bottom right is a small island 5. select a vertex on the big island, then in the top menu select {UV -> Pin} ![4.png](/attachments/1b505cc5-b253-4b60-be14-941456f8b4cc) 6. in the Edit Mode window, unwrap the mesh again {UV -> Unwrap} ![5.png](/attachments/c90042ef-8b23-45f9-8feb-f8035e1654e4) 7. Now the small island, which was the square in the bottom right, fills the whole map instead of remaining in the correct scale

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Richard Antalik added