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Maniphest T75981

Crash switching to Sculpt mode with material using Backface Culling
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.70

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: rB375c7dc4caf4
Worked: (optional)

Short description of error
When switching to sculpt mode, blender crashes instantly and unexpectedly.

Exact steps for others to reproduce the error
It has started happening on my specific file, which only contains a single object I was sculpting.
At first I thought it was vertex-count-related, but even after decimating the mesh, it still crashes.

To reproduce, simply open the .blend file, select the object, switch to sculpt mode.
I have also tried this on Blender 2.82 under Arch Linux, integrated GPU, same issue.
Same situation under Blender 2.83 beta.

untitled2.blend1 MBDownload

Revisions and Commits

rB Blender
rBbc83fc9c04be Fix T75981: crash in sculpt mode with mesh that used to have multiple materials

Event Timeline

Lucas Escot (flupe) created this task.Apr 21 2020, 10:55 PM
TheRedWaxPolice (TheRedWaxPolice) added a subscriber: TheRedWaxPolice (TheRedWaxPolice).Apr 21 2020, 11:58 PM

Remove the material (skin) slot...
Something weird is happening there...

Brecht Van Lommel (brecht) renamed this task from Crash when switching to Sculpt mode to Crash switching to Sculpt mode with material using Backface Culling.Apr 22 2020, 11:56 AM
Brecht Van Lommel (brecht) added projects: Sculpt, Paint & Texture, EEVEE & Viewport.
Lucas Escot (flupe) added a comment.Apr 22 2020, 12:49 PM

Thank you, it did allow me to go back to sculpt mode!
I need to investigate further why the material is causing problems though,
and I don't think that's caused by backface culling.

At some point I had two materials one the object, and one got deleted so maybe there's that.

Brecht Van Lommel (brecht) closed this task as Resolved by committing rBbc83fc9c04be: Fix T75981: crash in sculpt mode with mesh that used to have multiple materials.Apr 22 2020, 2:00 PM
Brecht Van Lommel (brecht) claimed this task.
Brecht Van Lommel (brecht) added a commit: rBbc83fc9c04be: Fix T75981: crash in sculpt mode with mesh that used to have multiple materials.