Render errors [glitchy frames] with baked cloth [from the UI, commandline as well as rendering with 'Lock Interface' is OK] #81750

New Issue

Arken · 2020-10-16T01:27:21+02:00

Arken commented

2020-10-16 01:27:21 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.77

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-10-07 21:43, hash: d8fcd8a316

Short description of error
I have a simple scene I press render animation and some of the frames come out messed up.
It looks like some sort of motion blur bug. Looks similar to this bug #74457 (Mantaflow foam particles as objects break motion blur)
I have rendered this on two different PC's, the problem is the same.
With baked cloth physics.

Jelly Jery (buggy render) - Cycles 256 samples Intel denoised.mov

Jelly Jery.blend

cycles	glitchy
cycles command line render	OK
cycles with Lock Interface	OK
eevee	glitchy
eevee without motion blur	glitchy

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.77 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-10-07 21:43, hash: d8fcd8a316 **Short description of error** I have a simple scene I press render animation and some of the frames come out messed up. It looks like some sort of motion blur bug. Looks similar to this bug #74457 (Mantaflow foam particles as objects break motion blur) I have rendered this on two different PC's, the problem is the same. With baked cloth physics. [Jelly Jery (buggy render) - Cycles 256 samples Intel denoised.mov](https://archive.blender.org/developer/F8996679/Jelly_Jery__buggy_render__-_Cycles_256_samples_Intel_denoised.mov) [Jelly Jery.blend](https://archive.blender.org/developer/F8996681/Jelly_Jery.blend) ![jerry-the-jelly-buggy-cycles-render-0054-51-78.jpg](https://archive.blender.org/developer/F8996707/jerry-the-jelly-buggy-cycles-render-0054-51-78.jpg) | cycles | glitchy | | -- | -- | | cycles command line render | OK | | cycles with Lock Interface | OK | | eevee | glitchy | | eevee without motion blur | glitchy |

Arken commented

2020-10-16 01:27:21 +02:00

Added subscriber: @Arken

Evan Wilson commented

2020-10-19 15:37:38 +02:00

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

Evan Wilson commented

2020-10-19 15:48:48 +02:00

Added subscriber: @EAW

Evan Wilson commented

2020-10-19 15:48:48 +02:00

Thank you for the report @Arken.

Do the artifacts occur always on the same frames? I rendered out 49-58 which includes two faulty frames from your video: 51 and 54. However, I didn't get any artifacts. I am rendering on my CPU, since my video card isn't supported by Cycles. Do you get the same artifacts if you render on your CPU instead of the GPU? I also rendered it out at 25% resolution. Do you get the artifacts if you change the resolution?

Also, please test using the latest daily build incase a fix has already made it into the code:
https://builder.blender.org/download/

Thank you for the report @Arken. Do the artifacts occur always on the same frames? I rendered out 49-58 which includes two faulty frames from your video: 51 and 54. However, I didn't get any artifacts. I am rendering on my CPU, since my video card isn't supported by Cycles. Do you get the same artifacts if you render on your CPU instead of the GPU? I also rendered it out at 25% resolution. Do you get the artifacts if you change the resolution? Also, please test using the latest daily build incase a fix has already made it into the code: https://builder.blender.org/download/

Arken commented

2020-10-31 17:21:57 +01:00

The artifacts are always on random frames.
Tested again with the latest Blender 2.91 beta release 8b806c86e1
With latest Nvidia Studio Driver 456.71 and with different resolution.
(CPU Ryzen 2700X)

CPU only, at 25% resolution:
jelly-jery-cpu.mov

GPU only, at 25% resolution:
jelly-jery-gpu.mov

GPU + CPU, at 25% resolution:
jelly-jery-cpu-gpu.mov

As you can see, all of the tests have glitched out frames and at random numbers.

The artifacts are always on random frames. Tested again with the latest Blender 2.91 beta release 8b806c86e12e With latest Nvidia Studio Driver 456.71 and with different resolution. (CPU Ryzen 2700X) **CPU only, at 25% resolution:** [jelly-jery-cpu.mov](https://archive.blender.org/developer/F9141451/jelly-jery-cpu.mov) **GPU only, at 25% resolution:** [jelly-jery-gpu.mov](https://archive.blender.org/developer/F9141461/jelly-jery-gpu.mov) **GPU + CPU, at 25% resolution:** [jelly-jery-cpu-gpu.mov](https://archive.blender.org/developer/F9141467/jelly-jery-cpu-gpu.mov) As you can see, all of the tests have glitched out frames and at random numbers.

Philipp Oeser commented

2020-11-18 16:42:19 +01:00

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

Philipp Oeser commented

2020-11-25 16:20:08 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-11-25 16:20:08 +01:00

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

Philipp Oeser commented

2020-11-25 16:20:08 +01:00

Also cannot reproduce here (I have rendered this at 25%, GPU, with 32samples).

**System Information**
Operating system: Linux-5.9.8-200.fc33.x86_64-x86_64-with-fedora-33-Thirty_Three 64 Bits
Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 455.45.01
2.91.0 Beta, branch: master, commit date: 2020-11-21 13:17, hash: `rB6c6a5a72c297`

Just to make sure: You are getting the glitches at lower samples as well, right?
Render > Lock Interface does not make a difference, right?

Also cannot reproduce here (I have rendered this at 25%, GPU, with 32samples). ``` **System Information** Operating system: Linux-5.9.8-200.fc33.x86_64-x86_64-with-fedora-33-Thirty_Three 64 Bits Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 455.45.01 2.91.0 Beta, branch: master, commit date: 2020-11-21 13:17, hash: `rB6c6a5a72c297` ``` Just to make sure: You are getting the glitches at lower samples as well, right? `Render` > `Lock Interface` does not make a difference, right?

Philipp Oeser commented

2020-11-26 15:24:43 +01:00

Added subscriber: @deadpin

Philipp Oeser commented

2020-11-26 15:24:43 +01:00

OK, just got confirmation from @deadpin that this also happens at 4spp at 25%.

We also checked Eevee (@deadpin could confirm glitches, even without motionblur, I could not, was redering fine in eevee for me)
jelly0001-0140.webm

Would still be good to know if this can reliably be prevented by Render > Lock Interface.

@deadpin, this was then working for you, right?

OK, just got confirmation from @deadpin that this also happens at 4spp at 25%. We also checked Eevee (@deadpin **could** confirm glitches, even without motionblur, I **could not**, was redering fine in eevee for me) [jelly0001-0140.webm](https://archive.blender.org/developer/F9379629/jelly0001-0140.webm) Would still be good to know if this can reliably be prevented by `Render` > `Lock Interface`. @deadpin, this was then working for you, right?

Jesse Yurkovich commented

2020-11-27 01:07:56 +01:00

Yeah, seems like lock interface also helped, so my table of results is basically:

cycles	glitchy
cycles command line render	OK
cycles with Lock Interface	OK
eevee	glitchy
eevee without motion blur	glitchy

I've only attempted each of these renders once. I can't make any more renders today but can try to make time late tomorrow/weekend if others aren't able to verify in a similar fashion.

Philipp Oeser changed title from ~~Cycles buggy rendering Blender 2.91 Alpha~~ to Render errors [glitchy frames] with baked physics [from the UI, commandline as well as rendering with 'Lock Interface' is OK]

2020-11-27 09:29:52 +01:00

Philipp Oeser changed title from ~~Render errors [glitchy frames] with baked physics [from the UI, commandline as well as rendering with 'Lock Interface' is OK]~~ to Render errors [glitchy frames] with baked cloth [from the UI, commandline as well as rendering with 'Lock Interface' is OK]

2020-11-27 09:31:12 +01:00

Philipp Oeser commented

2020-12-11 18:51:06 +01:00

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

Philipp Oeser commented

2020-12-11 18:51:06 +01:00

From what I can tell, I think this needs to be in Confirmed state now

From what I can tell, I think this needs to be in `Confirmed` state now

Boris Vitazek commented

2021-02-28 13:58:09 +01:00

Added subscriber: @stx

Boris Vitazek commented

2021-02-28 13:58:09 +01:00

Have the same problem with cloth, locking interface or rendering from command line does not help me.
Eevee however does not produce this problem in this case.
blender 2.92

glitch with blur:
circleStart1320-1403 optix.mp4
clean without blur:
circleStart1320-1403 no blur.mp4 - clean without blur

Have the same problem with cloth, locking interface or rendering from command line does **not** help me. Eevee however does not produce this problem in this case. blender 2.92 glitch with blur: [circleStart1320-1403 optix.mp4](https://archive.blender.org/developer/F9851981/circleStart1320-1403_optix.mp4) clean without blur: [circleStart1320-1403 no blur.mp4](https://archive.blender.org/developer/F9851983/circleStart1320-1403_no_blur.mp4) - clean without blur

Philipp Oeser removed the

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Render errors [glitchy frames] with baked cloth [from the UI, commandline as well as rendering with 'Lock Interface' is OK] #81750