Hair particles with motion blur crash #75238

New Issue

Rob Horvath · 2020-03-31T01:53:36+02:00

Rob Horvath commented

2020-03-31 01:53:36 +02:00

System Information
Mac Pro (Mid 2010)
3.33 GHz 6-core Intel Xeon
48GB Ram
Operating system: MacOS 10.14.6 (Mojave)
Graphics card: Sapphire Radeon RX 580 8GB

Blender Version
Broken:2.82a, master, 2020-3-12
Worked: unknown (new user)

Short description of error
Turning on Motion Blur causes rendering errors - material colour and even parts of background object disappear.
Windows version on same machine (dual boot set up) does not produce these errors.
See attached image for example.

Motion Blur off

Motion Blur on

**System Information** Mac Pro (Mid 2010) 3.33 GHz 6-core Intel Xeon 48GB Ram Operating system: MacOS 10.14.6 (Mojave) Graphics card: Sapphire Radeon RX 580 8GB **Blender Version** Broken:2.82a, master, 2020-3-12 Worked: unknown (new user) **Short description of error** Turning on Motion Blur causes rendering errors - material colour and even parts of background object disappear. Windows version on same machine (dual boot set up) does not produce these errors. See attached image for example. Motion Blur off ![donut motion blur off.png](https://archive.blender.org/developer/F8437776/donut_motion_blur_off.png) Motion Blur on ![donut motion blur on.png](https://archive.blender.org/developer/F8437781/donut_motion_blur_on.png)

Rob Horvath commented

2020-03-31 01:53:36 +02:00

Added subscriber: @robh

blender-admin commented

2020-03-31 01:53:36 +02:00

#79359 was marked as duplicate of this issue

blender-admin commented

2020-03-31 01:53:36 +02:00

#77084 was marked as duplicate of this issue

blender-admin commented

2020-03-31 01:53:36 +02:00

#75374 was marked as duplicate of this issue

Ankit Meel commented

2020-03-31 09:34:50 +02:00

Added subscriber: @ankitm

Ankit Meel commented

2020-03-31 09:34:50 +02:00

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

Ankit Meel commented

2020-03-31 09:34:50 +02:00

Please add a simple blend file that can help redo the bug.

Rob Horvath commented

2020-03-31 19:47:24 +02:00

donut.blend

[donut.blend](https://archive.blender.org/developer/F8439641/donut.blend)

Stas Haas commented

2020-04-01 09:55:51 +02:00

Added subscriber: @girafic

Stas Haas commented

2020-04-01 09:55:51 +02:00

For me 2.82a completely crashes if motion blur is activated (crashlog attached) and I try to render image, with the latest 2.83alpha (hash: 0062813c73) it also crashes.

@robh in your blender file all textures are missing (you can do that with: File --> External Data --> Pack all into .blend)

System Information
Operating system: Darwin-19.4.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon RX 480 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.8.24

osx_crash_2_82a.txt

For me 2.82a completely crashes if motion blur is activated (crashlog attached) and I try to render image, with the latest 2.83alpha (hash: `0062813c73`) it also crashes. @robh in your blender file all textures are missing (you can do that with: File --> External Data --> Pack all into .blend) **System Information** Operating system: Darwin-19.4.0-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon RX 480 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.8.24 [osx_crash_2_82a.txt](https://archive.blender.org/developer/F8440751/osx_crash_2_82a.txt)

Ankit Meel commented

2020-04-01 11:36:31 +02:00

(you can do that with: File --> External Data --> Pack all into .blend)

Also see if there's something to be simplified & extraneous elements removed.

If you could zip it before uploading, it'd be great.

> (you can do that with: File --> External Data --> Pack all into .blend) Also see if there's something to be simplified & extraneous elements removed. If you could zip it before uploading, it'd be great.

Rob Horvath commented

2020-04-01 16:15:50 +02:00

Sorry about that. Here is the packed and zipped blender file.
donut.blend.zip

Sorry about that. Here is the packed and zipped blender file. [donut.blend.zip](https://archive.blender.org/developer/F8441460/donut.blend.zip)

Stas Haas commented

2020-04-01 16:57:29 +02:00

Seems like it works with Blender 2.81a

Seems like it works with Blender 2.81a ![Bildschirmfoto 2020-04-01 um 16.49.21.png](https://archive.blender.org/developer/F8441571/Bildschirmfoto_2020-04-01_um_16.49.21.png)

Ankit Meel commented

2020-04-02 09:17:26 +02:00

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

Ankit Meel commented

2020-04-02 09:17:26 +02:00

With eevee, ~~it seems to be working fine~~ it at least doesn't crash.

With cycles, it crashes while rendering the same frame (and maybe more).
remember to turn on motion blur for eevee.

https://docs.blender.org/manual/en/latest/render/cycles/render_settings/motion_blur.html
https://docs.blender.org/manual/en/latest/render/eevee/render_settings/motion_blur.html

With eevee, ~~it seems to be working fine~~ it at least doesn't crash. ![Screenshot 2020-04-02 at 12.42.58.jpg](https://archive.blender.org/developer/F8442936/Screenshot_2020-04-02_at_12.42.58.jpg) With cycles, it crashes while rendering the same frame (and maybe more). remember to turn on motion blur for eevee. https://docs.blender.org/manual/en/latest/render/cycles/render_settings/motion_blur.html https://docs.blender.org/manual/en/latest/render/eevee/render_settings/motion_blur.html

Stas Haas commented

2020-04-02 10:23:45 +02:00

By removing the sprinkles it's looking fine, seems like there is a bug with particle system and motion blur.

By removing the sprinkles it's looking fine, seems like there is a bug with particle system and motion blur. ![Bildschirmfoto 2020-04-02 um 10.22.10.png](https://archive.blender.org/developer/F8443004/Bildschirmfoto_2020-04-02_um_10.22.10.png)

Ankit Meel commented

2020-04-05 13:02:31 +02:00

Added subscriber: @annapanna

Jacques Lucke changed title from ~~Motion Blur bug on Mac OS 10.14.6~~ to Hair particles with motion blur crash

2020-04-07 12:17:26 +02:00

Jacques Lucke commented

2020-04-07 12:26:10 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-04-07 12:26:10 +02:00

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

Jacques Lucke commented

2020-04-07 12:26:10 +02:00

I simplified the file a bit:
donut5.blend

As soon as the particle system is resimulated, it seems to work again. The issue appears to be in the cache already, I'm not entirely sure though...

Are you able to reproduce this issue from scratch in the latest Blender version? If yes, how exactly?

I simplified the file a bit: [donut5.blend](https://archive.blender.org/developer/F8454411/donut5.blend) As soon as the particle system is resimulated, it seems to work again. The issue appears to be in the cache already, I'm not entirely sure though... Are you able to reproduce this issue from scratch in the latest Blender version? If yes, how exactly?

Rob Horvath commented

2020-04-08 00:44:42 +02:00

I downloaded and tried out the donut5.blend file and it seemed to be working fine. But then I tried to animate the icing object by having it move across the screen. Once the movement started, the icing and the sprinkles totally disappeared for almost the rest of the movement.
Frame 1

Keyframe to move starts in frame 4 and icing disappeared.

It starts to reappear in frame 23.

By frame 27, you can see most of the icing, but the sprinkles are way behind.

It is not until frame 32 that the sprinkles suddenly appear on the icing, which coincided with the keyframe to stop moving.

If I remove the sprinkles from the icing, the animation renders as expected.

I downloaded and tried out the donut5.blend file and it seemed to be working fine. But then I tried to animate the icing object by having it move across the screen. Once the movement started, the icing and the sprinkles totally disappeared for almost the rest of the movement. Frame 1 ![0001.png](https://archive.blender.org/developer/F8455537/0001.png) Keyframe to move starts in frame 4 and icing disappeared. ![0004.png](https://archive.blender.org/developer/F8455539/0004.png) It starts to reappear in frame 23. ![0023.png](https://archive.blender.org/developer/F8455544/0023.png) By frame 27, you can see most of the icing, but the sprinkles are way behind. ![0027.png](https://archive.blender.org/developer/F8455552/0027.png) It is not until frame 32 that the sprinkles suddenly appear on the icing, which coincided with the keyframe to stop moving. ![0032.png](https://archive.blender.org/developer/F8455556/0032.png) If I remove the sprinkles from the icing, the animation renders as expected.

Ankit Meel commented

2020-05-02 20:02:21 +02:00

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

Richard Antalik commented

2020-05-27 16:04:32 +02:00

Added subscribers: @ashtonkemerling, @iss

Ashton Kemerling commented

2020-05-27 16:50:27 +02:00

I think it might be a bit more complicated than just motion blur + particles, as I was able to render an animation (also a doughnut) with sprinkles and motion blur.

For me the problem started when I added a mantaflow simulation on top of the existing motion blur and particles. See "Part Five.blend" that I attached to the duplicate issue #77084. Strangely I can render some frames from that particular file, just not the first few. The later frames can be rendered as stills.

Reproducible on Catalina and with Blender 2.82a and 2.83.

I think it might be a bit more complicated than just motion blur + particles, as I was able to render an animation (also a doughnut) with sprinkles and motion blur. For me the problem started when I added a mantaflow simulation on top of the existing motion blur and particles. See "Part Five.blend" that I attached to the duplicate issue #77084. Strangely I can render some frames from that particular file, just not the first few. The later frames can be rendered as stills. Reproducible on Catalina and with Blender 2.82a and 2.83.

Rob Horvath commented

2020-07-28 02:36:51 +02:00

Out of curiosity, I downloaded Blender beta 2.9.0 and did a render of the original file and there was no crash or render error.

Ankit Meel commented

2020-09-07 23:44:13 +02:00

Added subscribers: @kane_rogers, @lichtwerk

Ankit Meel commented

2020-09-07 23:44:45 +02:00

I checked @ashtonkemerling 's part five.blend,

@kane_rogers 's crash.blend

And @robh 's donut.blend

On 97c6c4e478, 2.83.5, 2.83.4 and couldn't get any crash while rendering the files with cycles.
Darwin 18, Intel HD 6000.
Since I was able to get the crash before and not now (and also that @robh confirmed in #75238#986288 ), closing this report.
For improper renders, reopening #77084.

I checked @ashtonkemerling 's part five.blend, ![image.png](https://archive.blender.org/developer/F8851787/image.png) @kane_rogers 's crash.blend ![image.png](https://archive.blender.org/developer/F8851805/image.png) And @robh 's donut.blend ![image.png](https://archive.blender.org/developer/F8851809/image.png) On 97c6c4e478830bd9a38873c5208e1ca37840b69a, 2.83.5, 2.83.4 and couldn't get any crash while rendering the files with cycles. Darwin 18, Intel HD 6000. Since I was able to get the crash before and not now (and also that @robh confirmed in #75238#986288 ), closing this report. For **improper** renders, reopening #77084.

Ankit Meel commented

2020-09-08 07:51:57 +02:00

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

Ankit Meel closed this issue

2020-09-08 07:51:57 +02:00

Ankit Meel self-assigned this 2020-09-08 07:51:57 +02:00

Ankit Meel commented

2020-09-08 07:51:57 +02:00

Forgot to click some buttons yesterday.

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Hair particles with motion blur crash #75238