Follow Active Quads not working, ignoring selected Face and throwing error #59461

New Issue

William Schneider · 2018-12-16T16:15:15+01:00

William Schneider commented

2018-12-16 16:15:15 +01:00

System Information
Operating system: Windows 10 Pro, 64-bits
Graphics card: GeForce GTX 1060

Blender Version
Broken: 2.80.0. 4488056f3d, 2018-12-16 00:27

Short description of error
UV Unwrap -> Follow Active Quads is broken in any Edge Length Mode, even with an Active Face selected and the neighbours UV unwrapped.

Exact steps for others to reproduce the error
dagger_face_selected.blend

The desired face for the other faces to be aligned to is already pre-selected in the blend file, but in any case it is pointed in the attached screenshot below.
Press U
Choose Follow Active Quads and confirm
Error will be thrown:

Traceback (most recent call last):
  File "F:\AppData\blender-2.80.0-git.4488056f3d9-windows64\2.80\scripts\startup\bl_operators\uvcalc_follow_active.py", line 273, in execute
    main(context, self)
  File "F:\AppData\blender-2.80.0-git.4488056f3d9-windows64\2.80\scripts\startup\bl_operators\uvcalc_follow_active.py", line 247, in main
    assert((status & STATUS_ERR_ACTIVE_FACE) != 0)
AssertionError

location: <unknown location>:-1

**System Information** Operating system: Windows 10 Pro, 64-bits Graphics card: GeForce GTX 1060 **Blender Version** Broken: 2.80.0. 4488056f3d9, 2018-12-16 00:27 **Short description of error** UV Unwrap -> Follow Active Quads is broken in any Edge Length Mode, even with an Active Face selected and the neighbours UV unwrapped. **Exact steps for others to reproduce the error** [dagger_face_selected.blend](https://archive.blender.org/developer/F5972341/dagger_face_selected.blend) - The desired face for the other faces to be aligned to is already pre-selected in the blend file, but in any case it is pointed in the attached screenshot below. - Press U - Choose Follow Active Quads and confirm - Error will be thrown: ``` Traceback (most recent call last): File "F:\AppData\blender-2.80.0-git.4488056f3d9-windows64\2.80\scripts\startup\bl_operators\uvcalc_follow_active.py", line 273, in execute main(context, self) File "F:\AppData\blender-2.80.0-git.4488056f3d9-windows64\2.80\scripts\startup\bl_operators\uvcalc_follow_active.py", line 247, in main assert((status & STATUS_ERR_ACTIVE_FACE) != 0) AssertionError location: <unknown location>:-1 ``` ![Screenshot_7.jpg](https://archive.blender.org/developer/F5972346/Screenshot_7.jpg)

William Schneider commented

2018-12-16 16:15:16 +01:00

Added subscriber: @zazzhu3

William Schneider commented

2018-12-16 17:50:53 +01:00

UPDATE: after I have hidden the mirror modifier of the mesh, the action worked as expected. I don't know whether this is a bug or the expected behaviour?

Sebastian Parborg commented

2018-12-17 15:25:58 +01:00

Added subscriber: @ZedDB

Campbell Barton was assigned by Sebastian Parborg

2018-12-17 15:25:58 +01:00

Sebastian Parborg commented

2018-12-17 15:25:58 +01:00

Well, you have managed to trigger an assert. So this shouldn't be the intended behavior.

blender-admin commented

2018-12-18 03:35:43 +01:00

This issue was referenced by 7e9f76944c

This issue was referenced by 7e9f76944c3117f99045f9cde6253e2592953330

Campbell Barton commented

2018-12-18 03:36:44 +01:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2018-12-18 03:36:44 +01:00

Roy T commented

2020-04-10 17:26:48 +02:00

Added subscriber: @roytries

Roy T commented

2020-04-10 17:26:48 +02:00

As always wisdom comes after posting something :). It seems that somehow I messed up the extrusion and the pieces of track are not quads, they consist of 8 vertices on 4 locations. So maybe the bug here is that I didn't get the 'not a quad' error message. However, in its intended use the Follow Active Quads function works beautifully! Sorry for the resurect!

Original comment:

This issue is set as closed/resolved. But I think I encounter exactly the same bug in 2.82A. See this small file: tank2.blend

In the attached file I've first created a Bezier circle, I then converted it to a mesh, extruded the edges, and filled them with faces. UV unwrapping this mesh works works normally, except for when I try to use Follow Active Quads. Then I get the assert((status & STATUS_ERR_ACTIVE_FACE) != 0) error. Even though I see that one face is active and all the other faces are also selected.

Follow active quads does work when I create a simple cube and try it on that.

As always wisdom comes after posting something :). It seems that somehow I messed up the extrusion and the pieces of track are not quads, they consist of 8 vertices on 4 locations. So maybe the bug here is that I didn't get the 'not a quad' error message. However, in its intended use the Follow Active Quads function works beautifully! Sorry for the resurect! Original comment: > This issue is set as closed/resolved. But I think I encounter exactly the same bug in 2.82A. See this small file: [tank2.blend](https://archive.blender.org/developer/F8462979/tank2.blend) > > In the attached file I've first created a Bezier circle, I then converted it to a mesh, extruded the edges, and filled them with faces. UV unwrapping this mesh works works normally, except for when I try to use Follow Active Quads. Then I get the `assert((status & STATUS_ERR_ACTIVE_FACE) != 0)` error. Even though I see that one face is active and all the other faces are also selected. > > Follow active quads does work when I create a simple cube and try it on that.

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Follow Active Quads not working, ignoring selected Face and throwing error #59461