Maniphest T97335

Mirror + Subdivision Surface Glitch
Closed, Duplicate
Actions

Assigned To
None
Authored By
duckmug
Apr 14 2022, 9:26 PM
Tags
  • BF Blender
Subscribers
duckmug
Pratik Borhade (PratikPB2123)
Richard Antalik (ISS)

Description

System Information
Operating system: Ubuntu Linux 20.04
Graphics card: Nvidia GeForce GTX 1060 6GB (510.54 drivers version)

Blender Version
Broken: 3.1.2 (Snap Version)
Worked: 3.0.1 (Snap Version)

Short description of error
Oddly enough, a weird graphics glitch appears in 3.1.2 in most cases when combining Mirror and a Subdivision Surface modifier after it and switching from object mode to edit mode. It's like the whole thing gets corrupt to the bone with random black lines appearing all over the place. I've asked someone to test this on Windows with the same Blender version and they were not able to reproduce it. Oddly enough, if there's another modifier after Subdivision Surface (solidify for example) the error won't appear.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

  1. Cut the mesh in half.
  2. Add Mirror modifier.
  3. Add Subdivision Surface modifier after it.
  4. Switch between object and edit modes a few times and see the error happening while in edit mode.

Related Objects

Event Timeline

duckmug created this task.Apr 14 2022, 9:26 PM
duckmug updated the task description.Apr 14 2022, 9:31 PM
duckmug updated the task description.
Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Apr 14 2022, 10:47 PM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

Check if turning off GPU subdivision in Preferences > Viewport helps.

duckmug added a comment.Apr 14 2022, 10:55 PM

Yes, the issue disappears if that is turned off.

Richard Antalik (ISS) added a comment.Apr 14 2022, 11:47 PM

Thanks for checking, Can you also check if this happens with latest alpha build from https://builder.blender.org/download/daily/?

Can you also click on Help > Save System Info and upload saved file? I have seen similar report - T96907, but not aware of any open.

duckmug added a comment.Apr 15 2022, 12:10 AM

Just tested it with the latest alpha build, the issue appears there as well.

Attaching the system info file.

system-info.txt20 KBDownload

Pratik Borhade (PratikPB2123) added a subscriber: Pratik Borhade (PratikPB2123).Apr 15 2022, 5:24 AM

This issue is already reported on tracker T96845: Regression: GPU Subdivision with mirror/Array modifier shows artifacts

Pratik Borhade (PratikPB2123) closed this task as a duplicate of T96845: Regression: GPU Subdivision with mirror/Array modifier shows artifacts.Apr 15 2022, 5:24 AM
duckmug updated the task description.Apr 15 2022, 3:35 PM