Some particles are not being rendered during the first render #93451

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opened 2021-11-28 16:04:20 +01:00 by Rafał Zawadzki · 10 comments

System Information
Operating system: Windows 10
Graphics card: I tried on two different computers with different GPUs - Nvidia RTX3070 and Mobile Nvidia RTX2060, same behaviour.

Blender Version
Broken: 2.93.6, 3.0.0 Release Candidate, 3.1.0 Alpha

Short description of error

Blender is not rendering some particles (in my case this is a grass) during the first render.
It does after re-rendering the scene, but this is quite confusing and inconvenient, especially in the moments when I have to resume render of animation.
Apparently this only happens when we add a force field to control the particles.

On top of this, 3x does not render trees (particles).

Open the blend file and press F12 to render. You should have similar result as on the screenshot:

render_first_2.93.png

Render again, and the grass will appear:

render_second_2.93.png

I attach results also from 3.0:

render_first_3.0.png

render_second_3.0.png

and 3.1:

render_first_3.1.png

render_second_3.1.png

Exact steps for others to reproduce the error

  • Open attached file
  • Render (F12) - See the particles issue
  • Render again - Now it is ok

turbulence_particle_eevee_bug.blend


Original File:
Because file is big (260M) I have decided to share the link: https://drive.google.com/file/d/1x3MPvuI0E97C4IeHmGPaNsRd8pPdAXJg/view?usp=sharing <- if you would prefer me to upload it anyway here, please just let me know.

**System Information** Operating system: Windows 10 Graphics card: I tried on two different computers with different GPUs - Nvidia RTX3070 and Mobile Nvidia RTX2060, same behaviour. **Blender Version** Broken: 2.93.6, 3.0.0 Release Candidate, 3.1.0 Alpha **Short description of error** Blender is not rendering some particles (in my case this is a grass) during the first render. It does after re-rendering the scene, but this is quite confusing and inconvenient, especially in the moments when I have to resume render of animation. Apparently this only happens when we add a force field to control the particles. On top of this, 3x does not render trees (particles). Open the blend file and press F12 to render. You should have similar result as on the screenshot: ![render_first_2.93.png](https://archive.blender.org/developer/F12557568/render_first_2.93.png) Render again, and the grass will appear: ![render_second_2.93.png](https://archive.blender.org/developer/F12557710/render_second_2.93.png) I attach results also from 3.0: ![render_first_3.0.png](https://archive.blender.org/developer/F12557778/render_first_3.0.png) ![render_second_3.0.png](https://archive.blender.org/developer/F12557822/render_second_3.0.png) and 3.1: ![render_first_3.1.png](https://archive.blender.org/developer/F12558514/render_first_3.1.png) ![render_second_3.1.png](https://archive.blender.org/developer/F12558555/render_second_3.1.png) **Exact steps for others to reproduce the error** - Open attached file - Render (F12) - See the particles issue - Render again - Now it is ok [turbulence_particle_eevee_bug.blend](https://archive.blender.org/developer/F12681821/turbulence_particle_eevee_bug.blend) --- Original File: Because file is big (260M) I have decided to share the link: https://drive.google.com/file/d/1x3MPvuI0E97C4IeHmGPaNsRd8pPdAXJg/view?usp=sharing <- if you would prefer me to upload it anyway here, please just let me know.

Added subscriber: @bluszcz

Added subscriber: @bluszcz
Rafał Zawadzki changed title from Some particles are not render during first render to Some particles are not being rendered during the first render 2021-11-28 16:04:45 +01:00

In the bug report I tried to set 3 tags, including 3.0 and 3.1 but it seems it does not work and just promotes last selected tag.

In the bug report I tried to set 3 tags, including 3.0 and 3.1 but it seems it does not work and just promotes last selected tag.

Added subscriber: @brecht

Added subscriber: @brecht

Bug reports should not be tagged with the Blender release they happen in.

Bug reports should not be tagged with the Blender release they happen in.

Removed subscriber: @brecht

Removed subscriber: @brecht

Added subscriber: @mano-wii

Added subscriber: @mano-wii

Thanks for the report, I can confirm.
It has to do with the turbulence effect and only occurs when rendered with Eevee.
I'm not sure which area of the code the problem is. It could be a bad dependency graph on the particle system, or a lack of update in Eevee, or a problem with the particle system itself.

Needs more investigation.
Here is a simplified file:
turbulence_particle_eevee_bug.blend

Thanks for the report, I can confirm. It has to do with the turbulence effect and only occurs when rendered with Eevee. I'm not sure which area of the code the problem is. It could be a bad dependency graph on the particle system, or a lack of update in Eevee, or a problem with the particle system itself. Needs more investigation. Here is a simplified file: [turbulence_particle_eevee_bug.blend](https://archive.blender.org/developer/F12681821/turbulence_particle_eevee_bug.blend)

Hello @mano-wii,

thank you for confirming the bug report.

What about fact that 3.x does not render trees at all?

Cheers, Rafał

Hello @mano-wii, thank you for confirming the bug report. What about fact that 3.x does not render trees at all? Cheers, Rafał

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

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

In #93451#1264023, @bluszcz wrote:
What about fact that 3.x does not render trees at all?

It may be related, but I haven't looked at it in detail. (even because the file is very complex).
If it's another bug, it must be reported separately.

> In #93451#1264023, @bluszcz wrote: > What about fact that 3.x does not render trees at all? It may be related, but I haven't looked at it in detail. (even because the file is very complex). If it's another bug, it must be reported separately.
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Reference: blender/blender#93451
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