Particle system density factor doesn't adhere to vertex weight proximity modifier #73650

New Issue

Elyasaf · 2020-02-06T22:54:18+01:00

Elyasaf commented

2020-02-06 22:54:18 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Intel(R) HD Graphics 5500 Intel 4.4.0 - Build 20.19.15.4835

Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-02-05 18:32, hash: 092deb88b0

Short description of error
Particle system density factor found under the Vertex Groups panel doesn't respond live to vertex groups alterations done by vertex weight proximity modifier. Strangely enough, it does respond when I turn off and back on the viewport visibility of any of the modifiers related to the mentioned problem. Need to mention that assigning the modified vertex group to any other parameter in the vertex group panel WILL NOT replicate the problem, and any change occurring to the vertex group will be reflected immediately in the viewport. Its a problem specifically with density evaluation.

Exact steps for others to reproduce the error
Move the circle hovering above the plane in X and Y axis only. Ideally, the pile of boxes should move as the circle is moving. after altering the circle's position, turn off and back on the visibility of the particle system (or that of vertex weight proximity modifier) in the modifier stack panel, and the distribution of the boxes on the plane should now be updated.

The vertex group is basically assigned to all the vertices on the plane, and the proximity modifier reveals some of them based on geometry distance.

BTW, this bug is VERY old: https://blenderartists.org/t/vertex-weight-proximity-modifier-cant-affect-particles-density/592213

Download Blend file:
Altered Vgroups particle system problem.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: Intel(R) HD Graphics 5500 Intel 4.4.0 - Build 20.19.15.4835 **Blender Version** Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-02-05 18:32, hash: `092deb88b0` **Short description of error** Particle system density factor found under the Vertex Groups panel doesn't respond live to vertex groups alterations done by vertex weight proximity modifier. Strangely enough, it does respond when I turn off and back on the viewport visibility of any of the modifiers related to the mentioned problem. Need to mention that assigning the modified vertex group to any other parameter in the vertex group panel WILL NOT replicate the problem, and any change occurring to the vertex group will be reflected immediately in the viewport. Its a problem specifically with density evaluation. **Exact steps for others to reproduce the error** Move the circle hovering above the plane in X and Y axis only. Ideally, the pile of boxes should move as the circle is moving. after altering the circle's position, turn off and back on the visibility of the particle system (or that of vertex weight proximity modifier) in the modifier stack panel, and the distribution of the boxes on the plane should now be updated. The vertex group is basically assigned to all the vertices on the plane, and the proximity modifier reveals some of them based on geometry distance. BTW, this bug is VERY old: https://blenderartists.org/t/vertex-weight-proximity-modifier-cant-affect-particles-density/592213 **Download Blend file:** [Altered Vgroups particle system problem.blend](https://archive.blender.org/developer/F8326389/Altered_Vgroups_particle_system_problem.blend)

Elyasaf commented

2020-02-06 22:54:18 +01:00

Added subscriber: @Elwex

blender-admin commented

2020-02-06 22:54:18 +01:00

#86902 was marked as duplicate of this issue

blender-admin commented

2020-02-06 22:54:18 +01:00

#67394 was marked as duplicate of this issue

blender-admin commented

2020-02-06 22:54:18 +01:00

#79755 was marked as duplicate of this issue

blender-admin commented

2020-02-06 22:54:18 +01:00

#79255 was marked as duplicate of this issue

blender-admin commented

2020-02-06 22:54:18 +01:00

#79223 was marked as duplicate of this issue

Philipp Oeser commented

2020-02-07 09:48:50 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-02-07 09:48:50 +01:00

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

Philipp Oeser commented

2020-02-07 09:48:50 +01:00

Yep, that is a known limitation of the current particle system.
This will be lifted with the upcoming particle nodes though [or the new hair object type].

Will keep open as a Known Issue as reference for now though...

Yep, that is a known limitation of the current particle system. This will be lifted with the upcoming particle nodes though [or the new hair object type]. Will keep open as a Known Issue as reference for now though...

Richard Antalik commented

2020-07-27 17:39:19 +02:00

Added subscriber: @mushroomeo

Philipp Oeser commented

2020-08-14 09:35:12 +02:00

Added subscriber: @jefrau

Matt Curtis commented

2020-10-12 21:39:04 +02:00

Added subscriber: @MattCurtis

Germano Cavalcante commented

2021-04-02 20:38:40 +02:00

Added subscribers: @christopher.burns, @mano-wii, @Sergey

Germano Cavalcante commented

2021-04-02 20:39:16 +02:00

Added subscriber: @PetrTarasov

KimQuyen commented

2021-05-08 16:55:17 +02:00

Added subscriber: @KimQuyen

Nicolas Macilvoy commented

2021-05-21 15:51:26 +02:00

Added subscriber: @Macilvoy

Philipp Oeser commented

2022-02-08 09:29:24 +01:00

Actually, we already have a report for this, see #77219 (Dynamic vertex groups (Dynamic Paint, Weight Proximity modifier, Geometry Nodes, ...) do not update density of particles in viewport display), will merge reports.

Philipp Oeser commented

2022-02-08 09:29:39 +01:00

Closed as duplicate of #77219

Philipp Oeser closed this issue

2022-02-08 09:29:39 +01:00

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Particle system density factor doesn't adhere to vertex weight proximity modifier #73650