Emitting particles from instances not working properly. #61289

New Issue

Iago Mota · 2019-02-07T17:53:24+01:00

Iago Mota commented

2019-02-07 17:53:24 +01:00

System Information
Operating system: Windows 10
Graphics card: Nvidia GeForce GTX 650 Ti
CPU: Intel® Core™ i7-3770

Blender Version
Broken: 2.8, 8c87af7440, 2019-02-06
Worked: 2.79

Short description of error
When trying to add a new particle system to an object with a particle instance modifier, the particles are only emitted from one of the instances, as opposed to all of them. This occurs even when "Use Modifier Stack" is enabled.

Exact steps for others to reproduce the error

With the default cube selected, give it a new particle system.
Add a mesh (preferably a sphere) and give it a Particle Instance modifier, selecting the default cube and its particle system in the "Object" and "Particle System" areas, respectively, and disabling "Unborn" and "Dead" (preferably enable "Size").
Give this new mesh a particle system, and, in the "Source" settings, enable "Use Modifier Stack".

**System Information** Operating system: Windows 10 Graphics card: Nvidia GeForce GTX 650 Ti CPU: Intel® Core™ i7-3770 **Blender Version** Broken: 2.8, 8c87af74409a, 2019-02-06 Worked: 2.79 **Short description of error** When trying to add a new particle system to an object with a particle instance modifier, the particles are only emitted from one of the instances, as opposed to all of them. This occurs even when "Use Modifier Stack" is enabled. **Exact steps for others to reproduce the error** - With the default cube selected, give it a new particle system. - Add a mesh (preferably a sphere) and give it a Particle Instance modifier, selecting the default cube and its particle system in the "Object" and "Particle System" areas, respectively, and disabling "Unborn" and "Dead" (preferably enable "Size"). - Give this new mesh a particle system, and, in the "Source" settings, enable "Use Modifier Stack".

Iago Mota commented

2019-02-07 17:53:24 +01:00

Added subscriber: @Iago-Diogo-de-Vasconcelos-Mota

Sebastian Parborg commented

2019-02-07 18:19:10 +01:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2019-02-07 18:19:10 +01:00

I followed your steps and created the scene in 2.79 but to me it seems like it works the same as in 2.8:
part_inst_test.blend

Are you using the latest 2.79 version? https://builder.blender.org/download/

I followed your steps and created the scene in 2.79 but to me it seems like it works the same as in 2.8: [part_inst_test.blend](https://archive.blender.org/developer/F6540585/part_inst_test.blend) Are you using the latest 2.79 version? https://builder.blender.org/download/

Iago Mota commented

2019-02-07 19:25:16 +01:00

My apologies. I forgot to include the fact that "unborn" and "Dead" need to be disabled in the Particle Instance modifier. I have tested this with the newest version of 2.79 and it seems to be working just as fine as the previous versions. In the recent builds of 2.8, however, it doesn't work properly.

Sergey Sharybin was assigned by Sebastian Parborg

2019-02-07 19:57:39 +01:00

Sebastian Parborg commented

2019-02-07 19:57:39 +01:00

I've updated my test file with the new instructions and can confirm that the results are different
part_inst_test.blend

I've updated my test file with the new instructions and can confirm that the results are different [part_inst_test.blend](https://archive.blender.org/developer/F6541366/part_inst_test.blend) ![part_inst.png](https://archive.blender.org/developer/F6541370/part_inst.png)

Sergey Sharybin commented

2019-02-08 10:35:10 +01:00

Attaching file which can be actually used to compare behavior between 2.79 and current 2.8: part_inst_test.blend

@Iago-Diogo-de-Vasconcelos-Mota, please always attach a simple .blend file, as requested in the bug report guidelines. This saves a lot of time of everyone.

Attaching file which can be actually used to compare behavior between 2.79 and current 2.8: [part_inst_test.blend](https://archive.blender.org/developer/F6547501/part_inst_test.blend) @Iago-Diogo-de-Vasconcelos-Mota, please always attach a simple .blend file, as requested in the bug report guidelines. This saves a lot of time of everyone.

blender-admin commented

2019-02-08 15:05:29 +01:00

This issue was referenced by e925c20f2f

This issue was referenced by e925c20f2facd266c4898d3533d17ed30f159f2a

Sergey Sharybin commented

2019-02-08 15:35:14 +01:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2019-02-08 15:35:14 +01:00

AntonTirol commented

2019-12-17 01:58:10 +01:00

Added subscriber: @AntonTirol

AntonTirol commented

2019-12-17 01:58:10 +01:00

I don't know if anybody is ever gonna read this as the task has been marked resolved. I'm writing nonetheless as I believe it is not resolved in 2.81a.

Here is what was possible in 2.79 and isn't anymore in 2.81a: https://youtu.be/BhjK-6t9Gqs?t=460 (see the result of the scene in the first 5 seconds of the video).
The .blend file uploaded by Sergey Sharybin shows the difference to older versions as the particles emitted by the cube don't emit particles themselves which they do in the youtube video.

I don't know if anybody is ever gonna read this as the task has been marked resolved. I'm writing nonetheless as I believe it is not resolved in 2.81a. Here is what was possible in 2.79 and isn't anymore in 2.81a: https://youtu.be/BhjK-6t9Gqs?t=460 (see the result of the scene in the first 5 seconds of the video). The .blend file uploaded by Sergey Sharybin shows the difference to older versions as the particles emitted by the cube don't emit particles themselves which they do in the youtube video.

Fred Sprinkle commented

2020-06-15 19:41:20 +02:00

Added subscriber: @FredSprinkle

Fred Sprinkle commented

2020-06-15 19:41:21 +02:00

ParticleVertexArrayProblem.blend

I am having a similar problem in 2.82, cannot instance particles using emit or hair from a mesh that doesn't have faces, even when emitting from verts. This is only a problem when I am also using an array modifier.

See modifier stack and particle system in attached file.

Yes I have toggled "use modifier stack", and yes I have put the particle modifier at the bottom of the stack.

[ParticleVertexArrayProblem.blend](https://archive.blender.org/developer/F8622094/ParticleVertexArrayProblem.blend) I am having a similar problem in 2.82, cannot instance particles using emit or hair from a mesh that doesn't have faces, even when emitting from verts. This is only a problem when I am also using an array modifier. See modifier stack and particle system in attached file. Yes I have toggled "use modifier stack", and yes I have put the particle modifier at the bottom of the stack.

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Emitting particles from instances not working properly. #61289