Bugs in ParticleSystem #42348

New Issue

Dennis Fassbaender · 2014-10-22T17:02:34+02:00

2014-10-22 17:02:34 +02:00

System Information
Windows 7, 64BIT, Nvidia 440GT + 780GTX, 16GB RAM, AMDFX 4x3,6GHz, SSD-System-Drive

Blender Version
Blender 2.72a HASH 73f5a41

There are two issues i found while editing/rendering a particle-scene:

1st- an object appears on a position after i press render (sometimes)- its an object to visualize particles to render them on cycles.
This object is placed outside the camera-view and will be seen "sometimes" while rendering.
After rendering its still in the middle of my view- i saved the blend in this status.

2nd- i found out that a particle-system is more stable when i reduce the size under the physics-tab inside the particlesetup (i know substeps does not help everytime!).
When i make them smaller for the physics they are rendered smaller, too. So i´ve tryed to make them bigger by entering a
higher value in the render-tab inside the particlesetup. But when i change the particle-size for rendering, the particle-size for physics are changing, too.
Seems there are two the same fields?

I´ve packed the rendered animation for you in a rar (Jpeg Sequence). You will see issue 1 there when playing the animation.
The blend is there, too. And also 2 screenshots where you can see what im talking about.

Hope you accept Drop-Box links.
The files are here:
https://www.dropbox.com/sh/q6ptfje33pnvsc7/AADUOPecYrLkxV2oizr3q7Dfa?dl=0

NOTE! : I´ve rendered the animation with 2.000.000 particles! For you i changed the amount to a smaller value.

Regards,
Dennis Fassbaender (DF VFX)

**System Information** Windows 7, 64BIT, Nvidia 440GT + 780GTX, 16GB RAM, AMDFX 4x3,6GHz, SSD-System-Drive **Blender Version** Blender 2.72a HASH 73f5a41 There are two issues i found while editing/rendering a particle-scene: 1st- an object appears on a position after i press render (sometimes)- its an object to visualize particles to render them on cycles. This object is placed outside the camera-view and will be seen "sometimes" while rendering. After rendering its still in the middle of my view- i saved the blend in this status. 2nd- i found out that a particle-system is more stable when i reduce the size under the physics-tab inside the particlesetup (i know substeps does not help everytime!). When i make them smaller for the physics they are rendered smaller, too. So i´ve tryed to make them bigger by entering a higher value in the render-tab inside the particlesetup. But when i change the particle-size for rendering, the particle-size for physics are changing, too. Seems there are two the same fields? I´ve packed the rendered animation for you in a rar (Jpeg Sequence). You will see issue 1 there when playing the animation. The blend is there, too. And also 2 screenshots where you can see what im talking about. Hope you accept Drop-Box links. The files are here: https://www.dropbox.com/sh/q6ptfje33pnvsc7/AADUOPecYrLkxV2oizr3q7Dfa?dl=0 NOTE! : I´ve rendered the animation with 2.000.000 particles! For you i changed the amount to a smaller value. Regards, Dennis Fassbaender (DF VFX)

Dennis Fassbaender commented

2014-10-22 17:02:34 +02:00

Changed status to: 'Open'

Dennis Fassbaender commented

2014-10-22 17:02:34 +02:00

Added subscriber: @DennisFassbaender

Antonis Ryakiotakis commented

2014-10-23 14:38:54 +02:00

Added subscribers: @LukasTonne, @Psy-Fi

Antonis Ryakiotakis commented

2014-10-23 14:38:54 +02:00

Any hint as to what actions are done to get that sphere to display would be helpful. Quickly playing with the file here I could not get it to show the sphere.

About display vs physics part, I think @LukasTonne is preparing something here?

Any hint as to what actions are done to get that sphere to display would be helpful. Quickly playing with the file here I could not get it to show the sphere. About display vs physics part, I think @LukasTonne is preparing something here?

ronan ducluzeau commented

2014-10-23 15:21:35 +02:00

Added subscriber: @zeauro

ronan ducluzeau commented

2014-10-23 15:21:35 +02:00

blender 2.72 hash 7429113

I confirm the first problem.
But if you move foampart object to a layer that is not rendered, it does not appear at all.

Second problem is a known limitation.
You have to bake particle system with desired physic size.
Then, you can modify rendered size.

blender 2.72 hash 7429113 I confirm the first problem. But if you move foampart object to a layer that is not rendered, it does not appear at all. Second problem is a known limitation. You have to bake particle system with desired physic size. Then, you can modify rendered size.

Dennis Fassbaender commented

2014-10-23 15:24:57 +02:00

On my System this happend sometimes while rendering. You can see in the Imageseq that it starts to be in viewport permanently some where in the middle of the seq.

Dennis Fassbaender commented

2014-10-23 15:38:52 +02:00

Of course, hiding the sphere works fine. Thank you.
Could that be a gpu memory error?

Yes, baking particles could help. In some cases it will not work. In exempel, i use an emitting plane with a boolean intersect modifier before the psystem.
Cache seems not working in this way.
I use this method to fake a reactor system.

Of course, hiding the sphere works fine. Thank you. Could that be a gpu memory error? Yes, baking particles could help. In some cases it will not work. In exempel, i use an emitting plane with a boolean intersect modifier before the psystem. Cache seems not working in this way. I use this method to fake a reactor system.

ronan ducluzeau commented

2014-10-27 18:19:27 +01:00

Maybe it is better now.
But I don't expect anything from a geometry addition or substraction since many years.
I really miss old reactor system to emit particles from particles events.

But to emit particles from object events, I recommand to use dynamic paint.
you can use it to generate textures or weight groups that will tweak particle system.

Maybe it is better now. But I don't expect anything from a geometry addition or substraction since many years. I really miss old reactor system to emit particles from particles events. But to emit particles from object events, I recommand to use dynamic paint. you can use it to generate textures or weight groups that will tweak particle system.

Dennis Fassbaender commented

2014-10-27 19:34:34 +01:00

Yes missing that, too.
I hope that Particle-Nodes will come and include this reactor-option.
I love using blender, but for VFX its hard to use, because there are "standards" missing, that are importend for visualfx-artists.
In example there is no shadow-only material. Smoke sim is instable when rigidbodys fall in the adaptiv domain, the fluidsim is outdated, sph is missing a mesher. Missing some hair-collision-options, fracture stuff (like modifier from scorpion81) is only avaiable in custombuilds (cell fracture does not have that workflow)....

I will never stop finding my ways in blender, but i wish that developers have an ear for us vfx-artists ;).

Thank you for your answers!

Regards,
Dennis Fassbaender

Yes missing that, too. I hope that Particle-Nodes will come and include this reactor-option. I love using blender, but for VFX its hard to use, because there are "standards" missing, that are importend for visualfx-artists. In example there is no shadow-only material. Smoke sim is instable when rigidbodys fall in the adaptiv domain, the fluidsim is outdated, sph is missing a mesher. Missing some hair-collision-options, fracture stuff (like modifier from scorpion81) is only avaiable in custombuilds (cell fracture does not have that workflow).... I will never stop finding my ways in blender, but i wish that developers have an ear for us vfx-artists ;). Thank you for your answers! Regards, Dennis Fassbaender

Lukas Tönne was assigned by Sergey Sharybin

2014-11-04 09:49:00 +01:00

Sergey Sharybin commented

2014-11-04 09:49:00 +01:00

Added subscriber: @Sergey

Sergey Sharybin commented

2014-11-04 09:49:00 +01:00

Sphere which sometimes appears in the camera view is likely caused by the cache issues in particle simulation. Quite the same happens with rigid body simulation. That would likely changed with the new dependency graph.

As for the second issue, i'd want to ask @lukastoenne.

Sphere which sometimes appears in the camera view is likely caused by the cache issues in particle simulation. Quite the same happens with rigid body simulation. That would likely changed with the new dependency graph. As for the second issue, i'd want to ask @lukastoenne.

Lukas Tönne commented

2014-11-05 10:12:21 +01:00

Changed status from 'Open' to: 'Archived'

Lukas Tönne closed this issue

2014-11-05 10:12:21 +01:00

Lukas Tönne commented

2014-11-05 10:12:21 +01:00

The single size property is a known particle limitation, but not a bug. We need a much more flexible particle simulation at some point where render and simulation properties can be decoupled, but hacking this into the current system would not work and/or break tons of other stuff. So i rather consider this a ToDo.

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Bugs in ParticleSystem #42348