UV Editor doesn't work when GPU Subdivision in the Viewport is enabled #96372

New Issue

Matteo Scopel · 2022-03-12T12:07:07+01:00

Matteo Scopel commented

2022-03-12 12:07:07 +01:00

System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.79

Blender Version
Broken: version: 3.1.0, branch: master, commit date: 2022-03-08 18:16, hash: c77597cd0e

Short description of error
I was unwrapping a very simple model when I noticed a weird, unpredictable behavior in the UV Editor. Specifically:

vertices do not seem to be properly selectable (see the weird, different overlay in the UV Editor)
unwrapping occasionally and unpredictably causes a lot of corrupted edges to appear in the UV Editor

I initially thought that some of my addons was causing this, so I've disabled them, but the problem persisted. After some time, I've realized that disabling the Subdivision modifier solved the issue and made unwrapping predictable again. Thus, I've finally come to the conclusion that the new GPU Subdivision setting is the culprit. I confirm that disabling this setting makes everything work fine again.

Exact steps for others to reproduce the error

unwrap an object with the subdivision modifier on it and GPU subdivision enabled in the settings.
try to select a vertex. The selection will be different from usual.
unwrapping the mesh might also create graphical corruption, as visible in the second screenshot.

I have also attached the file I was working on. I hope it can be useful for confirming this bug.

jar_model.blend

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.79 **Blender Version** Broken: version: 3.1.0, branch: master, commit date: 2022-03-08 18:16, hash: `c77597cd0e` **Short description of error** I was unwrapping a very simple model when I noticed a weird, unpredictable behavior in the UV Editor. Specifically: ![image.png](https://archive.blender.org/developer/F12923119/image.png) 1. vertices do not seem to be properly selectable (see the weird, different overlay in the UV Editor) ![image.png](https://archive.blender.org/developer/F12923121/image.png) 2. unwrapping occasionally and unpredictably causes a lot of corrupted edges to appear in the UV Editor I initially thought that some of my addons was causing this, so I've disabled them, but the problem persisted. After some time, I've realized that disabling the Subdivision modifier solved the issue and made unwrapping predictable again. Thus, I've finally come to the conclusion that the new GPU Subdivision setting is the culprit. I confirm that disabling this setting makes everything work fine again. **Exact steps for others to reproduce the error** 1. unwrap an object with the subdivision modifier on it and GPU subdivision enabled in the settings. 2. try to select a vertex. The selection will be different from usual. 3. unwrapping the mesh might also create graphical corruption, as visible in the second screenshot. I have also attached the file I was working on. I hope it can be useful for confirming this bug. [jar_model.blend](https://archive.blender.org/developer/F12923123/jar_model.blend)

Matteo Scopel commented

2022-03-12 12:07:07 +01:00

Added subscriber: @scopelma

blender-admin commented

2022-03-12 12:07:07 +01:00

#96628 was marked as duplicate of this issue

Jesse Yurkovich commented

2022-03-13 11:57:57 +01:00

Added subscribers: @kevindietrich, @deadpin

Jesse Yurkovich commented

2022-03-13 11:57:57 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Jesse Yurkovich commented

2022-03-13 11:57:57 +01:00

CC @kevindietrich

Pratik Borhade commented

2022-03-13 13:39:05 +01:00

Added subscriber: @PratikPB2123

Jesse Yurkovich commented

2022-03-20 03:07:25 +01:00

Added subscriber: @josemartinez-2

Joseph Hansen commented

2022-03-22 16:41:59 +01:00

Added subscriber: @josephhansen

Joseph Hansen commented

2022-03-22 16:41:59 +01:00

The Align X and Align Y operators for UV Editing don't work correctly either with GPU Subdivision on- you have to use each operator 20-30 times before it actually aligns correctly