Strange motion blur artifact in cycles? Rigged Character. #80428

New Issue

John Moore · 2020-09-03T12:05:09+02:00

John Moore commented

2020-09-03 12:05:09 +02:00

UPDATE: Images. The one with streaks is with Cycles & motion blur enabled. The other is with Eevee -- no blur.

System Information
(Computer A)
Operating system: macOS Mojave
Graphics card: Radeon Pro 570 4 GB

(Computer B)
Operating system: Windows 10
Graphics card: Geforce 1060

Blender Version
2.83, also tried in 2.9

So I've been spending time animating this robot character. I have it rigged with several objects that are masked so I can have the character switch his clothing during the animation. However I have been doing some test renders and notice that there are strange motion blur artifacts, especially around the hand area of the rig. I've tried deleting all of the masked objects and that hasn't worked. For some reason it still glitches with these strange motion blur streaks. Is this a bug or have I done something wrong on my end?

In the attached file it's noticeable on frame 206 & 207.
9.3retry.blend

UPDATE: Images. The one with streaks is with Cycles & motion blur enabled. The other is with Eevee -- no blur. ![ze7iT.png](https://archive.blender.org/developer/F8838437/ze7iT.png) ![zxSor.png](https://archive.blender.org/developer/F8838438/zxSor.png) **System Information** (Computer A) Operating system: macOS Mojave Graphics card: Radeon Pro 570 4 GB (Computer B) Operating system: Windows 10 Graphics card: Geforce 1060 **Blender Version** 2.83, also tried in 2.9 So I've been spending time animating this robot character. I have it rigged with several objects that are masked so I can have the character switch his clothing during the animation. However I have been doing some test renders and notice that there are strange motion blur artifacts, especially around the hand area of the rig. I've tried deleting all of the masked objects and that hasn't worked. For some reason it still glitches with these strange motion blur streaks. Is this a bug or have I done something wrong on my end? In the attached file it's noticeable on frame 206 & 207. [9.3retry.blend](https://archive.blender.org/developer/F8835961/9.3retry.blend)

John Moore commented

2020-09-03 12:05:09 +02:00

Added subscriber: @JohnMakara

Joseph Brandenburg commented

2020-09-03 16:19:06 +02:00

Added subscriber: @Josephbburg

Joseph Brandenburg commented

2020-09-03 16:19:06 +02:00

Can you post an image?

John Moore commented

2020-09-07 08:53:32 +02:00

Just figured it out. Seems to be because I have been using autosmooth. Turned it off and used edge loops instead, works perfectly fine now.

👀 1

Richard Antalik commented

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

Added subscriber: @iss

Richard Antalik commented

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

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

Richard Antalik commented

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

In #80428#1010632, @JohnMakara wrote:
Just figured it out. Seems to be because I have been using autosmooth. Turned it off and used edge loops instead, works perfectly fine now.

Does this mean there is no bug then?

> In #80428#1010632, @JohnMakara wrote: > Just figured it out. Seems to be because I have been using autosmooth. Turned it off and used edge loops instead, works perfectly fine now. Does this mean there is no bug then?

Richard Antalik commented

2020-10-15 21:11:45 +02:00

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

Richard Antalik closed this issue

2020-10-15 21:11:45 +02:00

Richard Antalik self-assigned this 2020-10-15 21:11:45 +02:00

Richard Antalik commented

2020-10-15 21:11:45 +02:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

Serghiii commented

2022-08-22 23:41:31 +02:00

Added subscriber: @Vigore

Serghiii commented

2022-08-22 23:41:31 +02:00

I don't really know the procedure, but I have the same issue, and I feel urge to share here
blender version 3.2.2
multiple machines at render with same effect
Cycles+animated character+subdivision+auto smooth normals toggled+motion blur enabled=strange spiky looking artifacts,
like random vertices offsetting from their intended positions causing straight lines on rendered image

I don't really know the procedure, but I have the same issue, and I feel urge to share here blender version 3.2.2 multiple machines at render with same effect Cycles+animated character+subdivision+auto smooth normals toggled+motion blur enabled=strange spiky looking artifacts, like random vertices offsetting from their intended positions causing straight lines on rendered image

Evan Wilson commented

2022-08-23 04:31:21 +02:00

Added subscriber: @EAW

Evan Wilson commented

2022-08-23 04:31:21 +02:00

@Vigore it is a known limitation that auto smooth causes these artifacts with motion blur.

See:
https://docs.blender.org/manual/en/latest/render/cycles/render_settings/motion_blur.html#limitations

@Vigore it is a known limitation that auto smooth causes these artifacts with motion blur. See: https://docs.blender.org/manual/en/latest/render/cycles/render_settings/motion_blur.html#limitations

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Strange motion blur artifact in cycles? Rigged Character. #80428