Vertex weight smooth operator + undo causes active vertex group index to change #106415

New Issue

rich202020 · 2023-04-01T07:57:25+02:00

rich202020 commented

2023-04-01 07:57:25 +02:00

System Information
Operating system: Linux Mint
Graphics card: AMD 6800xt

Blender Version
Currently 3.5.0, but this bug has been around as long as I've been using Blender on several older versions and while using Windows as well.

Short description of error

Have a rigged mesh, switch to weight paint mode, select a vertex group that's not the last one.
Call vertext weight smooth operator on a mesh.
Undo or Adjust the value inside the operator properties panel, the active vertex group should stay the one you selected, but it jumps to a different one (Looks to be the active one after the previous operator had acted upon). See video below for details.

Or use the provided file:

Select Bone.002 vertex group.
Call vertex weight smooth operator.
Set "Iterations" to 2 or Undo. active vertex group became Bone.003 again.

Original description:

On a rigged model with an armature and multiple vertex groups, if you use the Smooth operation and then change the smooth iterations, it jumps to a different vertex group. Video: https://www.youtube.com/watch?v=zY20jZRWh2A

I should've reported this years ago, but it's often only been a minor inconvenience and I always felt so sure that something so obvious would get patched out eventually, but it's been here for a very long time.

**System Information** Operating system: Linux Mint Graphics card: AMD 6800xt **Blender Version** Currently 3.5.0, but this bug has been around as long as I've been using Blender on several older versions and while using Windows as well. **Short description of error** - Have a rigged mesh, switch to weight paint mode, select a vertex group that's not the last one. - Call vertext weight smooth operator on a mesh. - Undo or Adjust the value inside the operator properties panel, the active vertex group should stay the one you selected, but it jumps to a different one (Looks to be the active one after the previous operator had acted upon). See video below for details. Or use the provided file: - Select `Bone.002` vertex group. - Call vertex weight smooth operator. - Set "Iterations" to 2 or Undo. active vertex group became `Bone.003` again. Original description: On a rigged model with an armature and multiple vertex groups, if you use the Smooth operation and then change the smooth iterations, it jumps to a different vertex group. Video: https://www.youtube.com/watch?v=zY20jZRWh2A I should've reported this years ago, but it's often only been a minor inconvenience and I always felt so sure that something so obvious would get patched out eventually, but it's been here for a very long time.

weight_smooth_and_undo.blend

840 KiB

rich202020 added the

labels 2023-04-01 07:57:26 +02:00

YimingWu commented

2023-04-01 08:38:51 +02:00

Can confirm the issue. This seems to be related to the undo system. Executing weight smooth operator itself won't change the active vertex group index, but tuning the value (undo and exec) or simply ctrl-z would cause the change.

My guess is that the undo system somehow didn't record/restore the active vertex group index when it's changed without an operator being called.

Can confirm the issue. This seems to be related to the undo system. Executing weight smooth operator itself won't change the active vertex group index, but tuning the value (undo and exec) or simply ctrl-z would cause the change. My guess is that the undo system somehow didn't record/restore the active vertex group index when it's changed without an operator being called.

YimingWu added

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Vertex weight smooth operator + undo causes active vertex group index to change #106415