Maniphest T80428

Strange motion blur artifact in cycles? Rigged Character.
Closed, Archived
Actions

Assigned To
Richard Antalik (ISS)
Authored By
John Moore (JohnMakara)
Sep 3 2020, 12:05 PM
Tags
  • BF Blender
Subscribers
Evan Wilson (EAW)
John Moore (JohnMakara)
Joseph Brandenburg (TheAngerSpecialist)
Richard Antalik (ISS)
Serghiii (Vigore)

Description

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.blend14 MBDownload

Event Timeline

John Moore (JohnMakara) created this task.Sep 3 2020, 12:05 PM
Joseph Brandenburg (TheAngerSpecialist) added a subscriber: Joseph Brandenburg (TheAngerSpecialist).Sep 3 2020, 4:19 PM

Can you post an image?

John Moore (JohnMakara) updated the task description.Sep 4 2020, 3:37 AM
John Moore (JohnMakara) added a comment.Sep 7 2020, 8:53 AM

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.

Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Sep 9 2020, 12:44 AM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).
In T80428#1010632, @John Moore (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 (ISS) closed this task as Archived.Oct 15 2020, 9:11 PM
Richard Antalik (ISS) claimed this task.

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 (Vigore) added a subscriber: Serghiii (Vigore).Aug 22 2022, 11:41 PM

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 (EAW) added a subscriber: Evan Wilson (EAW).Aug 23 2022, 4:31 AM

@Serghiii (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