Some particles are not being rendered during the first render #93451
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Reference: blender/blender#93451
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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 again, and the grass will appear:
I attach results also from 3.0:
and 3.1:
Exact steps for others to reproduce the error
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
Some particles are not render during first renderto Some particles are not being rendered during the first renderIn 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
Bug reports should not be tagged with the Blender release they happen in.
Removed subscriber: @brecht
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
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'
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.