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Maniphest T86281

Cycles Optix: Motion Blur causing grey fragments to appear in render
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Description

System Information
Windows 10 Home
RTX 3070

Blender Version
Broken: 2.92
Worked: ?

Short description of error
The scene has the camera moving around a flower that is growing. At certain angles, grey fragments start appearing on and around the flower.
The fragments do not appear in the viewport, only in the final render.
They only appear when using Optix, not with CUDA.
They only appear when enabling motion blur in the render settings.

system-info.txt23 KBDownload

Exact steps for others to reproduce the error

  • Open attached file
  • Render (F12)

bug.blend25 MBDownload

Event Timeline

Yuan Ahn (Yuyu) created this task.Mar 4 2021, 6:28 PM
Germano Cavalcante (mano-wii) renamed this task from Motion Blur causing grey fragments to appear in render to Cycles Optix: Motion Blur causing grey fragments to appear in render.Mar 8 2021, 7:45 PM
Germano Cavalcante (mano-wii) updated the task description. (Show Details)
Germano Cavalcante (mano-wii) added a project: Render & Cycles.
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).

I don't have hardware to test the problem, but I edited the description to better follow the submission template and guidelines.

Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Needs Information from User.Feb 11 2022, 4:18 PM
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

Sorry this has been lying around for so long.

I am seeing this here when I render that file:


(doesnt seem to be related to the shown renders you had...)

Philipp Oeser (lichtwerk) closed this task as Archived.Mar 24 2022, 1:38 PM

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.