GPencil: Scripting weight_get and Vertex Groups not working at expected with several groups #91511

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Kluya Storm · 2021-09-19T02:40:30+02:00

Kluya Storm commented

2021-09-19 02:40:30 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 960M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.25

Blender Version
Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: 1b8d33b18cGreasepencil weight_get and vertex_group.blend

Short description of error

weight_get will result in a vertex_group index error (RuntimeError: Error: Groups: index out of range) even when the stroke is weight-painted completely
Running weight_set along stroke first, weight-painting manually, and then running weight_get will not throw the error (most of the time).
The vertex_group index property of weight_get will result in a (RuntimeError: Error: Groups: index out of range) if a lower vertex_group index property had resulted in an index out of range error.

Exact steps for others to reproduce the error
See attached blend.

I've included 3 examples:
A try and except script to get the vertex weight of 4 strokes which fails on 3 upper vertex group indices.
A script that sets the vertex weight of all points to 0 and after which when you weight paint manually and rerun the first script, you get the vertex weight successfully
A script where you create the vertex_group and set them with a specific value successfully, but when you try to read them back with weight_get, it results with a vertex group index out of range

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 960M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.25 **Blender Version** Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: `1b8d33b18c`[Greasepencil weight_get and vertex_group.blend](https://archive.blender.org/developer/F10481110/Greasepencil_weight_get_and_vertex_group.blend) **Short description of error** - weight_get will result in a vertex_group index error (RuntimeError: Error: Groups: index out of range) even when the stroke is weight-painted completely - Running weight_set along stroke first, weight-painting manually, and then running weight_get will not throw the error (most of the time). - The vertex_group index property of weight_get will result in a (RuntimeError: Error: Groups: index out of range) if a lower vertex_group index property had resulted in an index out of range error. **Exact steps for others to reproduce the error** See attached blend. I've included 3 examples: A try and except script to get the vertex weight of 4 strokes which fails on 3 upper vertex group indices. A script that sets the vertex weight of all points to 0 and after which when you weight paint manually and rerun the first script, you get the vertex weight successfully A script where you create the vertex_group and set them with a specific value successfully, but when you try to read them back with weight_get, it results with a vertex group index out of range

Kluya Storm commented

2021-09-19 02:40:30 +02:00

Added subscriber: @kluya

Antonio Vazquez commented

2021-09-20 11:02:57 +02:00

Added subscriber: @antoniov

Antonio Vazquez commented

2021-09-20 11:02:57 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Antonio Vazquez self-assigned this 2021-09-20 11:02:57 +02:00

Antonio Vazquez commented

2021-09-20 11:02:57 +02:00

The problem is checking the number of available weights.

blender-admin commented

2021-09-20 11:10:31 +02:00

This issue was referenced by cc31c159a1

This issue was referenced by cc31c159a1501b25df014a9b39b720e4ef8d53b3

blender-admin commented

2021-09-20 11:10:31 +02:00

This issue was referenced by 1f51672d71

This issue was referenced by 1f51672d7126d8c0a0b962060c01632e6e07dd5f

Antonio Vazquez changed title from ~~Greasepencil Scripting weight_get and Vertex Groups~~ to GPencil: Scripting weight_get and Vertex Groups not working at expected with several groups

2021-09-20 11:10:44 +02:00

Antonio Vazquez commented

2021-09-20 11:11:02 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Antonio Vazquez closed this issue

2021-09-20 11:11:02 +02:00

Falk David referenced this issue

2023-02-10 13:03:22 +01:00

Blender LTS: Maintenance Task 2.93 #88449

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