Vertex group for new particle system with same settings resets. #86366

New Issue

Vyacheslav Kobozev · 2021-03-07T18:47:16+01:00

2021-03-07 18:47:16 +01:00

System Information
Operating system: Windows-8.1-6.3.9600-SP0 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-05 06:10, hash: b5d154f400
Worked: (newest version of Blender that worked as expected)

Short description of error
Create particle system, change vertex groups, create another one and select same particle settings datablock.
Check vertex groups.

2021-03-07_20-42-31.mp4

psvg.blend

**System Information** Operating system: Windows-8.1-6.3.9600-SP0 64 Bits Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-05 06:10, hash: `b5d154f400` Worked: (newest version of Blender that worked as expected) **Short description of error** Create particle system, change vertex groups, create another one and select same particle settings datablock. Check vertex groups. [2021-03-07_20-42-31.mp4](https://archive.blender.org/developer/F9877597/2021-03-07_20-42-31.mp4) [psvg.blend](https://archive.blender.org/developer/F9877603/psvg.blend)

Vyacheslav Kobozev commented

2021-03-07 18:47:16 +01:00

Added subscriber: @Vyach

Philipp Oeser commented

2021-03-08 09:03:45 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-03-08 09:03:45 +01:00

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

Philipp Oeser closed this issue

2021-03-08 09:03:45 +01:00

Philipp Oeser commented

2021-03-08 09:03:45 +01:00

The thing is: the vertex groups are properties of the ParticleSystem, other settings (such as count) are properties of the ParticleSettings

https://docs.blender.org/api/master/bpy.types.ParticleSystem.html
https://docs.blender.org/api/master/bpy.types.ParticleSettings.html

This is why the vertex groups are not shared across settings, they are shared systems.
I always thought the default names for particle systems (calling them "ParticleSettings", same as the settings themselves) is really bad since it leads to such confusions.

In any case, this is not a bug, will have to close (but thx reporting as usual @Vyach !)
I'll investigate in renaming the Defaults for the particle systems slots to ParticleSystem, but this is out of scope for this bugtracker.

The thing is: the vertex groups are properties of the **ParticleSystem**, other settings (such as count) are properties of the **ParticleSettings** https://docs.blender.org/api/master/bpy.types.ParticleSystem.html https://docs.blender.org/api/master/bpy.types.ParticleSettings.html This is why the vertex groups are not shared across settings, they are shared systems. I always thought the default names for particle systems (calling them "ParticleSettings", same as the settings themselves) is really bad since it leads to such confusions. In any case, this is not a bug, will have to close (but thx reporting as usual @Vyach !) I'll investigate in renaming the Defaults for the particle systems slots to ParticleSystem, but this is out of scope for this bugtracker.

Philipp Oeser commented

2021-03-08 09:19:48 +01:00

Btw. change in default naming happened in 7a6b46aac5 2.79 did not do this.

Btw. change in default naming happened in 7a6b46aac5 2.79 did not do this.

blender-admin commented

2021-03-08 10:06:25 +01:00

This issue was referenced by 2b9eea17cc

This issue was referenced by 2b9eea17cca4512fc47511ff3c596ce9a8f59356

Vyacheslav Kobozev commented

2021-03-08 19:04:26 +01:00

@lichtwerk oh, I see. Anyway it is confusing and unexpected, when all settings can be transferred with actual particle settings slot, but not groups influences.
And yes, naming was confusing too, despite I always knew, they are systems. Thanks for fix.

So, now i know, the proper way to duplicate system with groups — is side menu
{F9879724 size=full}
I'll leave this here just in case, someone will find this not_bug too.

@lichtwerk oh, I see. Anyway it is confusing and unexpected, when all settings can be transferred with actual particle settings slot, but not groups influences. And yes, naming was confusing too, despite I always knew, they are systems. Thanks for fix. So, now i know, the proper way to duplicate system with groups — is side menu {[F9879724](https://archive.blender.org/developer/F9879724/изображение.png) size=full} I'll leave this here just in case, someone will find this not_bug too.

Philipp Oeser commented

2021-03-08 19:27:14 +01:00

Yes, the owner is sometimes not clear if you are looking at a tab or panels.

For the fun part in particle system duplication: here is one that is also a bit hidden (and in this case, not even that useful), but you can actually hit {key F9} in the Properties Editor to reveal an option for the Duplicate Particle System operator:

Yes, the owner is sometimes not clear if you are looking at a tab or panels. For the fun part in particle system duplication: here is one that is also a bit hidden (and in this case, not even that useful), but you can actually hit {key F9} in the Properties Editor to reveal an option for the `Duplicate Particle System` operator: ![image.png](https://archive.blender.org/developer/F9879745/image.png)

Vyacheslav Kobozev commented

2021-03-08 22:27:35 +01:00

@lichtwerk huh, easter egg. {key F9} work right after duplicating system.
thanks for info again!

@lichtwerk huh, easter egg. {key F9} work right after duplicating system. thanks for info again!

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Vertex group for new particle system with same settings resets. #86366