Particle collisions aren't simulated before frame zero for negative frame simulations #71075

New Issue

SecuoyaEx · 2019-10-24T18:39:27+02:00

SecuoyaEx commented

2019-10-24 18:39:27 +02:00

Blender Version
Broken: 2.79, 2.81
Worked: (optional)

Short description of error
Making particles simulation start from negative frames don't allow for those particles to have collisions with meshes. Unless I set the initial frame to be negative.

Exact steps for others to reproduce the error

Open the file and look at the already baked simulation. The first particles went through while the later ones collide perfectly. You can also rebake the cache and see the same result

ParticleBug.blend

Known workaround
Change initial frame to match the first simulated frame before baking the simulation.

**Blender Version** Broken: 2.79, 2.81 Worked: (optional) **Short description of error** Making particles simulation start from negative frames don't allow for those particles to have collisions with meshes. Unless I set the initial frame to be negative. **Exact steps for others to reproduce the error** Open the file and look at the already baked simulation. The first particles went through while the later ones collide perfectly. You can also rebake the cache and see the same result [ParticleBug.blend](https://archive.blender.org/developer/F7854459/ParticleBug.blend) **Known workaround** Change initial frame to match the first simulated frame before baking the simulation.

SecuoyaEx commented

2019-10-24 18:39:27 +02:00

Added subscriber: @SecuoyaEx

blender-admin commented

2019-10-24 18:39:27 +02:00

#86865 was marked as duplicate of this issue

blender-admin commented

2019-10-24 18:39:27 +02:00

#96525 was marked as duplicate of this issue

blender-admin commented

2019-10-24 18:39:27 +02:00

#87883 was marked as duplicate of this issue

blender-admin commented

2019-10-24 18:39:27 +02:00

#82137 was marked as duplicate of this issue

Richard Antalik commented

2020-01-15 17:53:46 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-01-15 17:53:46 +01:00

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

Richard Antalik commented

2020-01-15 17:53:46 +01:00

I re-baked cache and didn't see the same result

Is this still an issue with latest build? https://builder.blender.org/download/

I re-baked cache and didn't see the same result Is this still an issue with latest build? https://builder.blender.org/download/

Richard Antalik commented

2020-01-23 01:51:53 +01:00

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

Richard Antalik closed this issue

2020-01-23 01:51:53 +01:00

Richard Antalik self-assigned this 2020-01-23 01:51:53 +01:00

Richard Antalik commented

2020-01-23 01:51:53 +01:00

Since last asking for information it has been 7 or more days, due to the policy of our bug tracker we will have to close the report.

SecuoyaEx commented

2020-01-23 10:45:27 +01:00

Tried it on 81b7f8efaf from Jan20th and it still happens after rebaking

Tried it on 81b7f8efaf7a from Jan20th and it still happens after rebaking ![expected.png](https://archive.blender.org/developer/F8296689/expected.png) ![result.png](https://archive.blender.org/developer/F8296690/result.png)

Philipp Oeser commented

2020-01-23 10:54:10 +01:00

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

Philipp Oeser reopened this issue

2020-01-23 10:54:10 +01:00

Richard Antalik commented

2020-01-23 11:06:53 +01:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Richard Antalik commented

2020-01-23 11:06:53 +01:00

I still see no issue here...

Sybren A. Stüvel commented

2020-01-23 14:47:56 +01:00

Added subscriber: @dr.sybren

Sybren A. Stüvel commented

2020-01-23 14:47:56 +01:00

Changed status from 'Needs Developer To Reproduce' to: 'Needs User Info'

Sybren A. Stüvel commented

2020-01-23 14:47:56 +01:00

I also can't reproduce here with current 2.82 branch (fb0136f908). I did enable User Preferences → Animation → Negative Frames, as working with negative frames makes no sense otherwise.

@SecuoyaEx can you make a video (or series of screenshots) that show what you're doing, with the latest nightly build of Blender?

I also can't reproduce here with current 2.82 branch (fb0136f908). I did enable User Preferences → Animation → Negative Frames, as working with negative frames makes no sense otherwise. ![image.png](https://archive.blender.org/developer/F8296982/image.png) @SecuoyaEx can you make a video (or series of screenshots) that show what you're doing, with the latest nightly build of Blender?

Dalai Felinto commented

2020-02-06 15:35:14 +01:00

Added subscriber: @dfelinto

Dalai Felinto commented

2020-02-06 15:35:14 +01:00

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

Dalai Felinto commented

2020-02-06 15:35:14 +01:00

I can reproduce the issue. It happens if you try to bake and your initial frame is not the initial frame of the simulation (-100 in this case).
The same issue happens in 2.79.

Simulations with negative numbers initial frames are not working well, unless you deliberately set the start frame accordingly.

I can reproduce the issue. It happens if you try to bake and your initial frame is not the initial frame of the simulation (-100 in this case). The same issue happens in 2.79. Simulations with negative numbers initial frames are not working well, unless you deliberately set the start frame accordingly.

Richard Antalik was unassigned by Dalai Felinto

2020-02-06 15:36:40 +01:00

Richard Antalik commented

2020-10-28 12:25:14 +01:00

Added subscriber: @aisatan.ne