Grease Pencil: "Normalize All" function does not work, nor behave as described #89468

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Chris · 2021-06-27T04:01:35+02:00

Chris commented

2021-06-27 04:01:35 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.11

Blender Version
Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: 1b8d33b18c
Worked: (newest version of Blender that worked as expected)

Short description of error
NOTE: It should be mentioned that grease pencil weight painting does not have any reliable ways to normalize weights between vertex groups. There is no Auto-Normalize functionality for grease pencil, and the "Normalize" and "Normalize All" functions don't work as described.

While smoothly painting weights between multiple bones of a grease pencil, if Normalize All is used:

At best case, nothing changes
At worst case, all painted vertex weights are remapped to 1.0 for all vertex groups, meaning the sum of some vertices with overlapping paint influence is greater than 1
In either case, neither will behave as expected, where the sum of all vertex influence values should equal 1.0

Normalize All Description: https://docs.blender.org/manual/en/latest/grease_pencil/modes/weight_paint/weights_menu.html#normalize-all

Weight painting with root bone selected

Weight painting with jaw bone selected

Weight painted with jaw bone selected (after root bone selected and "Normalize All" used)

Exact steps for others to reproduce the error

Create new project - 2D Animation
Add Grease Pencil Object - Monkey
Add Armature with additional bone for Monkey's jaw. Make sure jaw bone is parented to root armature bone (keep offset)
Set GreasePencil object's parent to armature
Select Armature and then Shift Select Suzanne GreasePencil, change modes to Weight Paint
With root bone active, paint 1.0 weight on all GreasePencil vertices
Select jaw bone (Ctrl + Click) and paint 1.0 weight on all jaw vertices. Include smoothing falloff for gradual curve
Observe that moving/rotating jaw will at best clamp weight influence range from 0-0.5 on assigned vertices
While still in weight paint mode, select jaw bone and perform the operation: Weights > Normalize All
Observe nothing has changed
With the root bone selected in weight paint mode, perform the operation: Weights > Normalize All
Observe the root bone still has 1.0 weight on all vertices

Select the jaw bone and observe that all vertices that were painted between (0.0 - 1.0) are now all assigned to full 1.0 weighting.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.11 **Blender Version** Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: `1b8d33b18c` Worked: (newest version of Blender that worked as expected) **Short description of error** NOTE: It should be mentioned that grease pencil weight painting does not have any reliable ways to normalize weights between vertex groups. There is no Auto-Normalize functionality for grease pencil, and the "Normalize" and "Normalize All" functions don't work as described. While smoothly painting weights between multiple bones of a grease pencil, if Normalize All is used: - At best case, nothing changes - At worst case, all painted vertex weights are remapped to 1.0 for all vertex groups, meaning the sum of some vertices with overlapping paint influence is greater than 1 - In either case, neither will behave as expected, where the sum of all vertex influence values should equal 1.0 Normalize All Description: https://docs.blender.org/manual/en/latest/grease_pencil/modes/weight_paint/weights_menu.html#normalize-all Weight painting with root bone selected ![BlenderSuzanne_rootpaint.png](https://archive.blender.org/developer/F10203395/BlenderSuzanne_rootpaint.png) Weight painting with jaw bone selected ![BlenderSuzanne_jawpaint.png](https://archive.blender.org/developer/F10203392/BlenderSuzanne_jawpaint.png) Weight painted with jaw bone selected (after root bone selected and "Normalize All" used) ![BlenderSuzanne_afternormalizeall.png](https://archive.blender.org/developer/F10203397/BlenderSuzanne_afternormalizeall.png) **Exact steps for others to reproduce the error** - Create new project - 2D Animation - Add Grease Pencil Object - Monkey - Add Armature with additional bone for Monkey's jaw. Make sure jaw bone is parented to root armature bone (keep offset) - Set GreasePencil object's parent to armature - Select Armature and then Shift Select Suzanne GreasePencil, change modes to Weight Paint - With root bone active, paint 1.0 weight on all GreasePencil vertices - Select jaw bone (Ctrl + Click) and paint 1.0 weight on all jaw vertices. Include smoothing falloff for gradual curve - Observe that moving/rotating jaw will at best clamp weight influence range from 0-0.5 on assigned vertices - While still in weight paint mode, select jaw bone and perform the operation: Weights > Normalize All - Observe nothing has changed - With the root bone selected in weight paint mode, perform the operation: Weights > Normalize All - Observe the root bone still has 1.0 weight on all vertices # Select the jaw bone and observe that all vertices that were painted between (0.0 - 1.0) are now all assigned to full 1.0 weighting.

Chris commented

2021-06-27 04:01:35 +02:00

Added subscriber: @Blasphemy

Antonio Vazquez self-assigned this 2021-06-27 15:30:28 +02:00

Antonio Vazquez commented

2021-06-27 18:12:35 +02:00

I have done a test with a simple file and I get this using 2 vertex groups:

****
1.0             0.8661803603172302 === 1.8661803603172302
0.4453125       0.37253209948539734 === 0.8178445994853973
1.0             0.7534894347190857 === 1.7534894347190857
0.6875          0.06570197641849518 === 0.7532019764184952

Weights After Normalize All with `Lock Active` disabled
****
0.5358538627624512 0.46414610743522644 === 0.9999999701976776
0.5444952249526978 0.45550474524497986 === 0.9999999701976776
0.5702913999557495 0.4297085404396057  === 0.9999999403953552
0.9127697944641113 0.08723022788763046 === 1.0000000223517418```

Be sure to uncheck `Lock Active`

![image.png](https://archive.blender.org/developer/F10203894/image.png)

This follows what manual describes: 

```For each point, this tool makes sure that the sum of the weights across all vertex groups is equal to 1. It normalizes all of the vertex groups, except for locked groups, which keep their weight values untouched.```

I have done a test with a simple file and I get this using 2 vertex groups: ```Weights Before (Vertex Grp 1, Vertx Grp 2 = Total) **** 1.0 0.8661803603172302 === 1.8661803603172302 0.4453125 0.37253209948539734 === 0.8178445994853973 1.0 0.7534894347190857 === 1.7534894347190857 0.6875 0.06570197641849518 === 0.7532019764184952 Weights After Normalize All with `Lock Active` disabled **** 0.5358538627624512 0.46414610743522644 === 0.9999999701976776 0.5444952249526978 0.45550474524497986 === 0.9999999701976776 0.5702913999557495 0.4297085404396057 === 0.9999999403953552 0.9127697944641113 0.08723022788763046 === 1.0000000223517418``` Be sure to uncheck `Lock Active` ![image.png](https://archive.blender.org/developer/F10203894/image.png) This follows what manual describes: ```For each point, this tool makes sure that the sum of the weights across all vertex groups is equal to 1. It normalizes all of the vertex groups, except for locked groups, which keep their weight values untouched.```

Chris commented

2021-06-28 00:10:20 +02:00

Can confirm behavior matches description when 'Lock Active' is unchecked.

I'd suggest changing the default value for 'Lock Active' to false as this appears to be an easy pitfall to fall into, as it overrides inferred behavior of 'normalizing all' towards a more nuanced case.

Can confirm behavior matches description when 'Lock Active' is unchecked. I'd suggest changing the default value for 'Lock Active' to false as this appears to be an easy pitfall to fall into, as it overrides inferred behavior of 'normalizing all' towards a more nuanced case.

Antonio Vazquez commented

2021-06-28 09:33:53 +02:00

Added subscribers: @mendio, @pablovazquez

Antonio Vazquez commented

2021-06-28 09:33:53 +02:00

@mendio @pablovazquez What do you think about changing default for Lock Active?

@mendio @pablovazquez What do you think about changing default for `Lock Active`?

Philipp Oeser commented

2021-06-28 11:01:12 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Matias Mendiola commented

2021-06-28 17:35:17 +02:00

Lock Active is On by default not only for Grease Pencil but Meshes, so a change in the default value should have to be consistent in both.
This task could be closed and another one created with a more general proposal if wanted.

Lock Active is On by default not only for Grease Pencil but Meshes, so a change in the default value should have to be consistent in both. This task could be closed and another one created with a more general proposal if wanted.

Antonio Vazquez commented

2021-06-28 17:37:22 +02:00

Changed status from 'Needs Developer To Reproduce' to: 'Archived'

Antonio Vazquez closed this issue

2021-06-28 17:37:22 +02:00

Antonio Vazquez commented

2021-06-28 17:37:22 +02:00

Thanks @mendio! I will close this task and if it's needed, a new task will be created for default value change.

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Grease Pencil: "Normalize All" function does not work, nor behave as described #89468

Select the jaw bone and observe that all vertices that were painted between (0.0 - 1.0) are now all assigned to full 1.0 weighting.