Particles -> Physics none -> Hit render -> Particles flying around. #54445

New Issue

Minne Danhieux · 2018-03-28T10:02:49+02:00

Minne Danhieux commented

2018-03-28 10:02:49 +02:00

System Information
WIN7 64b GTX 970

Blender Version
2.79b and a

Short description of error
I use a grid type geotry for making grass. There is a particle system om the this geometry with physics set to none. Everything is ok and fine until i hit render.
For some reason the particles move a little bit visualy in the viewport when blender prepares for rendering. This results in exploding particles. I can not really reproduce the error for the moment in a test scene. But this is really frustrating.

Exact steps for others to reproduce the error
Unfortunatly not yet found reproduction. I keep testing in a meanwhile.

**System Information** WIN7 64b GTX 970 **Blender Version** 2.79b and a **Short description of error** I use a grid type geotry for making grass. There is a particle system om the this geometry with physics set to none. Everything is ok and fine until i hit render. For some reason the particles move a little bit visualy in the viewport when blender prepares for rendering. This results in exploding particles. I can not really reproduce the error for the moment in a test scene. But this is really frustrating. **Exact steps for others to reproduce the error** Unfortunatly not yet found reproduction. I keep testing in a meanwhile.![29665055_961987153977532_1458597520929934552_o.jpg](https://archive.blender.org/developer/F2522489/29665055_961987153977532_1458597520929934552_o.jpg)

Minne Danhieux commented

2018-03-28 10:02:49 +02:00

Added subscriber: @MinneDanhieux

Minne Danhieux commented

2018-03-28 11:55:05 +02:00

I downloaded 2.79 zip and that seems to work fine for now. So the problem started in the 2.79a release.

Minne Danhieux commented

2018-03-28 11:58:35 +02:00

To fast conclusion. It still is exploding.

Minne Danhieux commented

2018-03-28 14:57:29 +02:00

I found some reproduction posibilities.. i will make a video and a scene with the bug later on.

Minne Danhieux commented

2018-04-03 13:45:45 +02:00

This is a file that screws up "physics > none" in the particle settings. In the 2 images you can see what is the problem.
Sometimes the grass is good, but sometimes the grass explodes when i hit F12. Random stuff going on. It shouldn't move at all nice and smooth flat.

setup_V007.blend

This is a file that screws up "physics > none" in the particle settings. In the 2 images you can see what is the problem. Sometimes the grass is good, but sometimes the grass explodes when i hit F12. Random stuff going on. It shouldn't move at all nice and smooth flat. [setup_V007.blend](https://archive.blender.org/developer/F2584308/setup_V007.blend) ![image.png](https://archive.blender.org/developer/F2584330/image.png) ![image.png](https://archive.blender.org/developer/F2584335/image.png)

Minne Danhieux commented

2018-04-03 13:47:36 +02:00

Anybody? :)

Philipp Oeser commented

2018-04-04 10:02:23 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2018-04-04 10:02:23 +02:00

Please dont change priority yourself.
Having a look now...

Please dont change priority yourself. Having a look now...

Philipp Oeser commented

2018-04-04 10:34:14 +02:00

Unfortunately I havent been able to reproduce this here.
You were talking about some reproduction posibilities, have you found something that makes a difference between "good" and "exploding"?

Unfortunately I havent been able to reproduce this here. You were talking about some *reproduction posibilities*, have you found something that makes a difference between "good" and "exploding"?

Minne Danhieux commented

2018-04-05 08:57:14 +02:00

Hi Philipp,

the problem with this bug is that it is random. Did you hit F12 a couple of times?
Sometimes it happens, sometimes it doesn't. It should never happen when physics is off.
I'm spending 1 hour a day testing stuff out. But the problem seems to be there hidden to strike most of the time when i think i fixt or found the problem.

So Everybody testing this scene. Hit F12 on frame 2. wait and see if the grass that is rendered is nice and clean. The moment you start to see holes in de ground stuff wil also be flying around.
The next time you hit it, it could very well be normal again.

I hope this can be solved sooner or later. I was hoping that some kind of setting would fix it, but the random nature of the problem makes it unlikely.

Thx for anybody testing and getting the same shit. I had 1 person on the blender group on facebook that also has this problem.

Gr,

Minne

Hi Philipp, the problem with this bug is that it is random. Did you hit F12 a couple of times? Sometimes it happens, sometimes it doesn't. It should never happen when physics is off. I'm spending 1 hour a day testing stuff out. But the problem seems to be there hidden to strike most of the time when i think i fixt or found the problem. So Everybody testing this scene. Hit F12 on frame 2. wait and see if the grass that is rendered is nice and clean. The moment you start to see holes in de ground stuff wil also be flying around. The next time you hit it, it could very well be normal again. I hope this can be solved sooner or later. I was hoping that some kind of setting would fix it, but the random nature of the problem makes it unlikely. Thx for anybody testing and getting the same shit. I had 1 person on the blender group on facebook that also has this problem. Gr, Minne

Minne Danhieux commented

2018-04-05 09:01:02 +02:00

I downloaded the file again just to be sure. This is what happend the first time i hit F12. Explosion, but look, the physics is set to none! :)

I downloaded the file again just to be sure. This is what happend the first time i hit F12. Explosion, but look, the physics is set to none! :) ![image.png](https://archive.blender.org/developer/F2604724/image.png)

Minne Danhieux commented

2018-04-09 11:44:02 +02:00

Ok, news here.
I deleted blender and every trace. I made a imaculate new installation of blender and its gone!
So the problem isn't there in default installation.

I wil try to figure out wich addon or change causes the bug to ocure.

Hopfully an update soon... i keep testing. :)

Ok, news here. I deleted blender and every trace. I made a imaculate new installation of blender and its gone! So the problem isn't there in default installation. I wil try to figure out wich addon or change causes the bug to ocure. Hopfully an update soon... i keep testing. :)

Philipp Oeser commented

2018-04-09 12:29:04 +02:00

Changed status from 'Open' to: 'Resolved'

Philipp Oeser closed this issue

2018-04-09 12:29:04 +02:00

Philipp Oeser self-assigned this 2018-04-09 12:29:04 +02:00

Philipp Oeser commented

2018-04-09 12:29:04 +02:00

Glad to hear this, and thx for your testing!
I will close this then. You can still keep us posted with updates or reopen if you found a bug (e.g. with bundled addons) causing this. [I'm also interested in what might have caused this]

Glad to hear this, and thx for your testing! I will close this then. You can still keep us posted with updates or reopen if you found a bug (e.g. with bundled addons) causing this. [I'm also interested in what might have caused this]

Minne Danhieux commented

2018-04-09 14:36:15 +02:00

Ok, I think I found the croocked handle.

default 'Window Draw Method' is 'Automic'.
For some reason i remember testing this leaving this on 'Full'.

When setting on 'Full' in default config the scene goes bananas.
When switching 'Full' to 'Automatic' in my old config the scene goes to normal.

So 99% sure this is causing it. But i need confirmation:

Reproduce instructions: Download the scene previously found in this threat. Open up preferences set the window draw method to full. Test F12 couple of times switch to frame 1-2. If it is croocked it will show after some tries.
Good Luck!

I will never leave this on Full again because it is not recommended either to do so. :)

Ok, I think I found the croocked handle. default 'Window Draw Method' is 'Automic'. For some reason i remember testing this leaving this on 'Full'. When setting on 'Full' in default config the scene goes bananas. When switching 'Full' to 'Automatic' in my old config the scene goes to normal. So 99% sure this is causing it. But i need confirmation: Reproduce instructions: Download the scene previously found in this threat. Open up preferences set the window draw method to full. Test F12 couple of times switch to frame 1-2. If it is croocked it will show after some tries. Good Luck! I will never leave this on Full again because it is not recommended either to do so. :) ![image.png](https://archive.blender.org/developer/F2642705/image.png)

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Particles -> Physics none -> Hit render -> Particles flying around. #54445