System particles end at the wrong frame when using alternative start/end frames #43768

New Issue

Kagi · 2015-02-21T18:48:27+01:00

Kagi commented

2015-02-21 18:48:27 +01:00

System Information
Windows 8.1 / OSX 10.10.2 / Xubuntu 13.10

Blender Version
Broken: 2.73a 64bits official on both systems

When using alternative start and end frames in the timeline, a particle system doesn't end at the right frame.

In my case it ends too early. The particle system start at frame 1 and ends at frame 200. I use alternative start/end frames from 1 to 250. The simulation start right at frame 1 but ends at frame 132, because when I disable alternative start and end from the timeline, I noticed that the 'global' start and end frames are from 100 to 132.

Exact steps for others to reproduce the error

Here's a blend file:

https://www.dropbox.com/s/3m8d0y4c9juktm0/bug-particules-fluide.blend?dl=0

Open the file, play the simulation and it should anormaly stops at 132 (with a weird effect after). Then disable the alternate start/end from the timeline, the animation start at 100 and end at 132. Changing the frames to start at 1 and ends at 250 solve the problem when enabling alternative start/end frames again.

**System Information** Windows 8.1 / OSX 10.10.2 / Xubuntu 13.10 **Blender Version** Broken: 2.73a 64bits official on both systems When using alternative start and end frames in the timeline, a particle system doesn't end at the right frame. In my case it ends too early. The particle system start at frame 1 and ends at frame 200. I use alternative start/end frames from 1 to 250. The simulation start right at frame 1 but ends at frame 132, because when I disable alternative start and end from the timeline, I noticed that the 'global' start and end frames are from 100 to 132. **Exact steps for others to reproduce the error** Here's a blend file: https://www.dropbox.com/s/3m8d0y4c9juktm0/bug-particules-fluide.blend?dl=0 Open the file, play the simulation and it should anormaly stops at 132 (with a weird effect after). Then disable the alternate start/end from the timeline, the animation start at 100 and end at 132. Changing the frames to start at 1 and ends at 250 solve the problem when enabling alternative start/end frames again.

Kagi commented

2015-02-21 18:48:27 +01:00

Changed status to: 'Open'

Kagi commented

2015-02-21 18:48:27 +01:00

Added subscriber: @JonK

Julian Eisel commented

2015-02-21 19:55:23 +01:00

Changed status from 'Open' to: 'Archived'

Julian Eisel closed this issue

2015-02-21 19:55:23 +01:00

Julian Eisel self-assigned this 2015-02-21 19:55:23 +01:00

Julian Eisel commented

2015-02-21 19:55:23 +01:00

Added subscriber: @LukasTonne

Julian Eisel commented

2015-02-21 19:55:23 +01:00

Had a look at the code, and I think it's fine as it is. It makes sense to have the particle lifetime always being relative to the total start/end frames of the scene, as the preview start/end frames is aimed for temporary changes without having any affect on the scene itself. Or differently said: The preview range is just for preview ;)

So thanks for the report, but I don't see a bug here (luckily) :)

(CC'ing @LukasTonne so he can correct me/the code in case I'm wrong)

Had a look at the code, and I think it's fine as it is. It makes sense to have the particle lifetime always being relative to the total start/end frames of the scene, as the preview start/end frames is aimed for temporary changes without having any affect on the scene itself. Or differently said: The preview range is just for preview ;) So thanks for the report, but I don't see a bug here (luckily) :) (CC'ing @LukasTonne so he can correct me/the code in case I'm wrong)

Kagi commented

2015-02-21 20:15:10 +01:00

I'm fine with the fact that alternative start/end frames are for preview, but shouldn't we have something to warn us that particle systems won't be correct in that case? Or disabling particles when using the alternative start/end frames? Or something else to avoid doing the same mistake I did... Or maybe I missed it.

I use the alternative start/end frames feature all the time and all seems fine with it except the particles.

I'm fine with the fact that alternative start/end frames are for preview, but shouldn't we have something to warn us that particle systems won't be correct in that case? Or disabling particles when using the alternative start/end frames? Or something else to avoid doing the same mistake I did... Or maybe I missed it. I use the alternative start/end frames feature all the time and all seems fine with it except the particles.

ronan ducluzeau commented

2015-02-21 20:28:30 +01:00

Added subscriber: @zeauro

ronan ducluzeau commented

2015-02-21 20:28:30 +01:00

I think it is valid. It does not make more sense to limit particle caching to total end frame of scene than for other physics.
(In fact, here, only end frame is limited.)

For cloth, softbodies, rigid bodies, caching continues after total end frame.

For me, it does not make sense to bake after active interval.
For playback, it is really weird to block it before end of active interval.

I think it is valid. It does not make more sense to limit particle caching to total end frame of scene than for other physics. (In fact, here, only end frame is limited.) For cloth, softbodies, rigid bodies, caching continues after total end frame. For me, it does not make sense to bake after active interval. For playback, it is really weird to block it before end of active interval.

Julian Eisel commented

2015-02-21 20:55:17 +01:00

Changed status from 'Archived' to: 'Open'

Julian Eisel reopened this issue

2015-02-21 20:55:17 +01:00

Julian Eisel commented

2015-02-21 20:55:17 +01:00

Okay, had a deeper look and I agree. It should take the preview range into account. Fix incoming.

Okay, had a deeper look and I agree. It *should* take the preview range into account. Fix incoming.

Kagi commented

2015-02-21 20:57:49 +01:00

Great. Thank you. :)