Rendering prevent particles to collide with other objects #75217

New Issue

Tilan · 2020-03-30T16:29:34+02:00

Tilan commented

2020-03-30 16:29:34 +02:00

System Information
Operating system: Windows-10-10.0.17763-SP0 64 Bits
Graphics card: Quadro K600/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 353.30

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: 375c7dc4ca
Worked: Never (2.8+)

Short description of error
Particles generated by a particle emitter will collide with objects when still in the Blender workspace, but once we try rendering the animation, we can see particles aren't colliding with objects anymore, particles are just going through them.

Exact steps for others to reproduce the error

Create any object that you want your particles to collide with (a plan, for example)
Create a particle emitter above your object. I wanted it to emit red glowing cube particles so i made the particles based on a cube object with a red Emission modifier (see in the .blend file)
Enable collisions on your object (for me, the plan) and even on the cube being used as a particle (just to ensure it will collide)
Press play : it works ! Particle are colliding with the object
However, now render your animation in a .avi file
On the final animation, you can see it's not colliding anymore, like if you hadn't enabled collisions

Note : You can see it in the .blend file but everything is in the same collection. I even tried restarting blender, moving the cube part to a different collection, and some other things but none of this worked

Particle Collision Bug.blend

**System Information** Operating system: Windows-10-10.0.17763-SP0 64 Bits Graphics card: Quadro K600/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 353.30 **Blender Version** Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: `375c7dc4ca` Worked: Never (2.8+) **Short description of error** Particles generated by a particle emitter will collide with objects when still in the Blender workspace, but once we try rendering the animation, we can see particles aren't colliding with objects anymore, particles are just going through them. **Exact steps for others to reproduce the error** 1. Create any object that you want your particles to collide with (a plan, for example) 2. Create a particle emitter above your object. I wanted it to emit red glowing cube particles so i made the particles based on a cube object with a red Emission modifier (see in the .blend file) 3. Enable collisions on your object (for me, the plan) and even on the cube being used as a particle (just to ensure it will collide) 4. Press play : it works ! Particle are colliding with the object 5. However, now render your animation in a .avi file 6. On the final animation, you can see it's not colliding anymore, like if you hadn't enabled collisions Note : You can see it in the .blend file but everything is in the same collection. I even tried restarting blender, moving the cube part to a different collection, and some other things but none of this worked [Particle Collision Bug.blend](https://archive.blender.org/developer/F8436995/Particle_Collision_Bug.blend)

Tilan commented

2020-03-30 16:29:34 +02:00

Added subscriber: @Zuraax

Martin Bergwerf commented

2020-03-31 12:07:01 +02:00

Added subscriber: @martinbergwerf-3

Martin Bergwerf commented

2020-03-31 12:07:01 +02:00

Don't know if this is normal, but there is a workaround: bake the particle simulation before rendering.
(Rendering single frames, one by one also gives the correct result, but render animation in any format doesn't work.)

Don't know if this is normal, but there is a workaround: bake the particle simulation before rendering. (Rendering single frames, one by one also gives the correct result, but render animation in any format doesn't work.)

Richard Antalik commented

2020-03-31 18:59:45 +02:00

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

Tilan commented

2020-04-01 15:43:26 +02:00

I've tried baking the particle simulation before rending. It worked however, even there are now some bugs with the particles. At some point, they might appear instantly at a different place. Collision seems to be fixed but particles move from times to times to random places, in an unwanted way.

Brecht Van Lommel commented

2020-05-13 21:31:02 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2020-05-13 21:31:02 +02:00

Changed status from 'Confirmed' to: 'Needs User Info'

Brecht Van Lommel commented

2020-05-13 21:31:02 +02:00

All physics must be baked before rendering, this is currently a known limitation (and the solution will probably involve warning about unbaked physics before rendering).

However I can't reproduce issues with particles moving to random places in the attach .blend file, after baking and rendering the animation.

All physics must be baked before rendering, this is currently a known limitation (and the solution will probably involve warning about unbaked physics before rendering). However I can't reproduce issues with particles moving to random places in the attach .blend file, after baking and rendering the animation.

Philipp Oeser commented

2020-07-06 10:03:14 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-07-06 10:03:14 +02:00

Changed status from 'Needs User Info' to: 'Archived'

Philipp Oeser closed this issue

2020-07-06 10:03:14 +02:00

Philipp Oeser self-assigned this 2020-07-06 10:03:14 +02:00

Philipp Oeser commented

2020-07-06 10:03:14 +02:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

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Rendering prevent particles to collide with other objects #75217