Regression: UV Follow Active Quads operator moves unselected vertices in UV editor #115432

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opened 2023-11-26 03:47:36 +01:00 by marc · 5 comments

marc commented

2023-11-26 03:47:36 +01:00

System Information
Operating system: Linux-6.6.2-arch1-1-x86_64-with-glibc2.38 64 Bits, X11 UI
Graphics card: AMD Radeon RX 470 Graphics (polaris10, LLVM 16.0.6, DRM 3.54, 6.6.2-arch1-1) AMD 4.6 (Core Profile) Mesa 23.2.1-arch1.2

Blender Version
Broken: version: 4.0.1, branch: blender-v4.0-release, commit date: 2023-11-16 16:40, hash: d0dd92834a08
Worked: version: 3.6.5.

Short description of error
[UV -> Follow Active Quads] operator does not behave as it did in older versions.
Using the follow active quads operator on faces that share UV vertices with other, non-selected faces modifies UV coordinates of those faces in unintended ways.
As shown in the video, 3.6.5 ripped those UV vertices apart while 4.0.1 does not.

Exact steps for others to reproduce the error
Starting from the included .blend file, select leftmost face then the face above it, then run follow active quads.

**System Information** Operating system: Linux-6.6.2-arch1-1-x86_64-with-glibc2.38 64 Bits, X11 UI Graphics card: AMD Radeon RX 470 Graphics (polaris10, LLVM 16.0.6, DRM 3.54, 6.6.2-arch1-1) AMD 4.6 (Core Profile) Mesa 23.2.1-arch1.2 **Blender Version** Broken: version: 4.0.1, branch: blender-v4.0-release, commit date: 2023-11-16 16:40, hash: `d0dd92834a08` Worked: version: 3.6.5. **Short description of error** [UV -> Follow Active Quads] operator does not behave as it did in older versions. Using the follow active quads operator on faces that share UV vertices with other, non-selected faces modifies UV coordinates of those faces in unintended ways. As shown in the video, 3.6.5 ripped those UV vertices apart while 4.0.1 does not. **Exact steps for others to reproduce the error** Starting from the included .blend file, select leftmost face then the face above it, then run follow active quads.

followBug02.blend

885 KiB

followBug02.mp4

1.1 MiB

marc added the

labels 2023-11-26 03:47:37 +01:00

marc changed title from ~~UV Follow Active Quads operator moves pinned vertices in UV editor~~ to Regression: UV Follow Active Quads operator moves unselected pinned vertices in UV editor

2023-11-26 03:53:50 +01:00

marc changed title from ~~Regression: UV Follow Active Quads operator moves unselected pinned vertices in UV editor~~ to Regression: UV Follow Active Quads operator moves unselected vertices in UV editor

2023-11-26 03:57:09 +01:00

Philipp Oeser commented

2023-11-27 09:44:06 +01:00

Member

Can confirm, will check

Can confirm, will check

Philipp Oeser added

and removed

labels 2023-11-27 09:44:32 +01:00

Philipp Oeser commented

2023-11-27 10:57:04 +01:00

Member

This is affected by e0e3650495 and 7b3e1cbb96

The former actually caused the bug, the later fixed a temporary bug where this was not working from the 3DView at all (without having the faces also selected again in the UV Editor)

It seems the following part of the code is responsible for this (not sure if it is even neccessary?)

# Propagate UV changes across boundary of selection.

@Chris_Blackbourn : mind checking?

This is affected by e0e3650495 and 7b3e1cbb9627031dcad6b986b95d2faec295d950 The former actually caused the bug, the later fixed a temporary bug where this was not working from the 3DView at all (without having the faces also selected again in the UV Editor) It seems the following part of the code is responsible for this (not sure if it is even neccessary?) `# Propagate UV changes across boundary of selection.` @Chris_Blackbourn : mind checking?

Philipp Oeser added

and removed

labels 2023-11-27 10:57:14 +01:00

Lino Thomas commented

2023-12-22 10:38:30 +01:00

We stumbled upon this bug as well now. This is breaking our modeling/texturing pipeline, as we are using atlas and trim sheets to create assets.
Unwrap follow active quads is an essential piece in this workflow and without it we are so much less effective.

Right now the workaround is to select the affected faces in the UV editor, move them a bit to not have them (invisibly) connect to surrounding UVs and then do the operation.

I would greatly appreciate if someone who is able to, could have a look at the matter and try to resolve it.

We stumbled upon this bug as well now. This is breaking our modeling/texturing pipeline, as we are using atlas and trim sheets to create assets. Unwrap follow active quads is an essential piece in this workflow and without it we are so much less effective. Right now the workaround is to select the affected faces in the UV editor, move them a bit to not have them (invisibly) connect to surrounding UVs and then do the operation. I would greatly appreciate if someone who is able to, could have a look at the matter and try to resolve it.

1.4 MiB

Jonas Dichelle referenced this issue from a commit

2024-01-08 22:43:50 +01:00

Update scripts/startup/bl_operators/uvcalc_follow_active.py

Jonas Dichelle referenced this issue

2024-01-08 22:46:23 +01:00

Removed propagation of UV changes across boundary of selection #116914

Jonas Dichelle commented

2024-01-08 22:48:16 +01:00

Contributor

It seems to have been the propagation of UV changes across boundary of selection, removing it resolves the issue.

It seems to have been the propagation of UV changes across boundary of selection, removing it resolves the issue.

Lino Thomas commented

2024-01-08 22:59:58 +01:00

I tested the change from Jonas and confirm that it resolves my issue. Thank you! <3

I tested the change from Jonas and confirm that it resolves my issue. Thank you! <3

Campbell Barton referenced this issue from a commit

2024-01-09 06:50:48 +01:00

Fix #115432: UV Follow Active Quads operator moves unselected vertices

Campbell Barton closed this issue

2024-01-09 06:50:49 +01:00

Blender Bot added

and removed

labels 2024-01-09 06:50:51 +01:00

Campbell Barton referenced a pull request that will close this issue

2024-01-09 06:57:03 +01:00

Removed propagation of UV changes across boundary of selection #116914

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