particle emitter not emitting in the same frequency when being parented to an empty, or object with rigid body dynamics. #39923

New Issue

roger bootsma · 2014-04-27T21:10:21+02:00

roger bootsma commented

2014-04-27 21:10:21 +02:00

System Information
I7 2600K Nvidea 560

Blender Version
Broken: version 2,7
Worked: (optional)

Short description of error

when i apply a particle emitter on a single vertex mesh with the emitter speed to zero and parent it to a cube with rigid body dynamics enabled and then i let the cube fall on a plane, then the parented emitter does not properly emit the particles, there are too less particles emitted while if the emitter is not parented it emits normally, this should be clearly visible in the blend file

rigid_body_bug.blend

**System Information** I7 2600K Nvidea 560 **Blender Version** Broken: version 2,7 Worked: (optional) **Short description of error** **when i apply a particle emitter on a single vertex mesh with the emitter speed to zero and parent it to a cube with rigid body dynamics enabled and then i let the cube fall on a plane, then the parented emitter does not properly emit the particles, there are too less particles emitted while if the emitter is not parented it emits normally, this should be clearly visible in the blend file** [rigid_body_bug.blend](https://archive.blender.org/developer/F86198/rigid_body_bug.blend)

roger bootsma commented

2014-04-27 21:10:21 +02:00

Changed status to: 'Open'

roger bootsma self-assigned this 2014-04-27 21:10:21 +02:00

roger bootsma commented

2014-04-27 21:10:21 +02:00

Added subscriber: @rogerbootsma

Bastien Montagne commented

2014-04-28 16:46:26 +02:00

Added subscriber: @mont29

roger bootsma was unassigned by Bastien Montagne

2014-04-28 16:46:49 +02:00

Lukas Tönne was assigned by Bastien Montagne

2014-04-28 16:46:49 +02:00

Bastien Montagne commented

2014-04-28 16:46:49 +02:00

Lukas, care to check? Thanks!

Lukas Tönne commented

2014-04-29 09:15:29 +02:00

I think we had a report about this before ...

Basically the particle emitter has a feature to interpolate emission locations for animated objects. However, when you include parenting (whether using a rigid body parent or just an animated parent doesn't matter iirc), the interpolation feature does not work. It cannot evaluate the emitter location for sub-frames then.

Afaik there is no easy solution to this issue atm. What would have to happen is that particle systems keep track of the actual final transform of the emitter in the current and next frames and then do interpolation between these transforms, instead of using direct animation curve eval.

I think we had a report about this before ... Basically the particle emitter has a feature to interpolate emission locations for **animated** objects. However, when you include parenting (whether using a rigid body parent or just an animated parent doesn't matter iirc), the interpolation feature does not work. It cannot evaluate the emitter location for sub-frames then. Afaik there is no easy solution to this issue atm. What would have to happen is that particle systems keep track of the actual final transform of the emitter in the current and next frames and then do interpolation between these transforms, instead of using direct animation curve eval.

Lukas Tönne commented

2014-04-29 09:25:54 +02:00

In fact, i made a fix a while ago to extend support for such interpolation to animated parents as well: c24a23f264

But this still does not work for rigid body parents, because these don't have animation curves that can simply be evaluated to give an interpolated child transform ...

In fact, i made a fix a while ago to extend support for such interpolation to animated parents as well: c24a23f264 But this still does not work for *rigid body* parents, because these don't have animation curves that can simply be evaluated to give an interpolated child transform ...

Lukas Tönne commented

2014-04-29 09:34:51 +02:00

Changed status from 'Open' to: 'Archived'

Lukas Tönne closed this issue

2014-04-29 09:34:51 +02:00

Lukas Tönne commented

2014-04-29 09:34:51 +02:00

I've updated the particles TODO list according to current state of affairs, but this issue can't be solved with the current system in a reasonable amount of time, sorry.
http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Particles

I've updated the particles TODO list according to current state of affairs, but this issue can't be solved with the current system in a reasonable amount of time, sorry. http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Particles

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particle emitter not emitting in the same frequency when being parented to an empty, or object with rigid body dynamics. #39923