Dynamic vertex groups (Dynamic Paint, Weight Proximity modifier, Geometry Nodes, ...) do not update density of particles in viewport display #77219

New Issue

wolfgang bertrand · 2020-05-31T11:23:04+02:00

wolfgang bertrand commented

2020-05-31 11:23:04 +02:00

System Information
Operating system: windows 10
Graphics card: Quadro M620

Blender Version
Broken: 2.90
Worked: Never

Short description of error
I want to use my dynamic vertex group to generate particles on a plane.
It just works when I change parameters during the playback but it's not realtime when I hit play.

Exact steps for others to reproduce the error

Open attached file
Play animation
Change any property of the particle during the playback
dynamic_paint_test.blend

**System Information** Operating system: windows 10 Graphics card: Quadro M620 **Blender Version** Broken: 2.90 Worked: Never **Short description of error** I want to use my dynamic vertex group to generate particles on a plane. It just works when I change parameters during the playback but it's not realtime when I hit play. **Exact steps for others to reproduce the error** - Open attached file - Play animation - Change any property of the particle during the playback [dynamic_paint_test.blend](https://archive.blender.org/developer/F8567157/dynamic_paint_test.blend)

wolfgang bertrand commented

2020-05-31 11:23:04 +02:00

Added subscriber: @NsDos

blender-admin commented

2020-05-31 11:23:04 +02:00

#100542 was marked as duplicate of this issue

blender-admin commented

2020-05-31 11:23:04 +02:00

#92418 was marked as duplicate of this issue

blender-admin commented

2020-05-31 11:23:04 +02:00

#84668 was marked as duplicate of this issue

blender-admin commented

2020-05-31 11:23:04 +02:00

#73650 was marked as duplicate of this issue

blender-admin commented

2020-05-31 11:23:04 +02:00

#95585 was marked as duplicate of this issue

Germano Cavalcante commented

2020-06-02 15:49:06 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-06-02 15:49:06 +02:00

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

Germano Cavalcante commented

2020-06-02 15:49:06 +02:00

I tested it at 2.79 and 2.82, and it didn't work there.

This is the same root of problem as the #67394
Basically the density and position of each particle does not change with the modifiers updates.
This is intended to, for example, not redistribute hair on an animated character.
But in fact I don't see the need for this for non-hair particles.

This can be improved and there are plans to modify/redo the particle system.
For now I will mark this as a Known Issue.

I tested it at 2.79 and 2.82, and it didn't work there. This is the same root of problem as the #67394 Basically the density and position of each particle does not change with the modifiers updates. This is intended to, for example, not redistribute hair on an animated character. But in fact I don't see the need for this for non-hair particles. This can be improved and there are plans to modify/redo the particle system. For now I will mark this as a `Known Issue`.

Germano Cavalcante changed title from ~~blender 2.8 dynamic paint particles viewport display~~ to Dynamic weigth paint does not update density of particles in viewport display

2020-06-02 15:51:55 +02:00

Philipp Oeser changed title from ~~Dynamic weigth paint does not update density of particles in viewport display~~ to Dynamic vertex groups (Dynamic Paint, Weight Proximity modifier, ...) do not update density of particles in viewport display

2022-02-08 09:27:40 +01:00

Philipp Oeser commented

2022-02-08 09:28:17 +01:00

Added subscribers: @Quver, @lichtwerk, @OmarEmaraDev

Philipp Oeser commented

2022-02-08 09:29:40 +01:00

Added subscribers: @Elwex, @Macilvoy, @KimQuyen, @PetrTarasov, @Sergey, @christopher.burns, @MattCurtis, @jefrau, @mushroomeo

Philipp Oeser commented

2022-02-08 09:30:45 +01:00

Just noting that for some usecases, using the hair length vertexgroup might do the trick.

Just noting that for some usecases, using the hair `length` vertexgroup might do the trick.

Philipp Oeser commented

2022-02-08 09:31:28 +01:00

Added subscriber: @Vyach

quvr commented

2022-02-08 10:58:19 +01:00

Found another similar report: #92418
I got the idea to avoid updating hairs on characters but it's hardcoded and there is no way to disable it right now. A new particle system is a big project that will take a lot of time until it can provide a workaround to this. Perhaps having it as a checkbox near "use modifier stack" in particle settings is a good temporary solution? If it's not hard to do of course.
Using length doesn't work for non-hair particles.
Another workaround I found at the moment is to use geometry nodes to create-remove vertices on every frame to trigger the update

Found another similar report: #92418 I got the idea to avoid updating hairs on characters but it's hardcoded and there is no way to disable it right now. A new particle system is a big project that will take a lot of time until it can provide a workaround to this. Perhaps having it as a checkbox near "use modifier stack" in particle settings is a good temporary solution? If it's not hard to do of course. Using length doesn't work for non-hair particles. Another workaround I found at the moment is to use geometry nodes to create-remove vertices on every frame to trigger the update

Philipp Oeser commented

2022-02-08 12:11:20 +01:00

Added subscriber: @kursadk

Philipp Oeser commented

2022-08-23 10:47:03 +02:00

Added subscribers: @ramonkarlos, @PratikPB2123

Philipp Oeser changed title from ~~Dynamic vertex groups (Dynamic Paint, Weight Proximity modifier, ...) do not update density of particles in viewport display~~ to Dynamic vertex groups (Dynamic Paint, Weight Proximity modifier, Geometry Nodes, ...) do not update density of particles in viewport display

2022-08-23 10:47:28 +02:00

Philipp Oeser removed the

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Dynamic vertex groups (Dynamic Paint, Weight Proximity modifier, Geometry Nodes, ...) do not update density of particles in viewport display #77219