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When sculpting with dyntopo using undo hides random parts of the geometry
Confirmed, NormalPublic


System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: AMD Radeon RX 5700 XT ATI Technologies Inc. 4.5.13587 Core Profile Context 20.4.2 26.20.15029.27017

Blender Version
Broken: after face sets implementation
Tested in 2.91.0 Alpha, branch: master, commit date: 2020-08-28 00:49, hash: rB5ee60c981573

Short description of error
When sculpting with dyntopo if you undo sometimes part of the mesh simply dissappear.

Exact steps for others to reproduce the error
-open the file below.
-change the size of the dyntopo detail to something small like 2 or 3px
-get close to the object and use the brush once

If you make it in the right way you can get it everytime

You can make the geometry re-appear by leaving sculpt mode. Once you go back, note that the geometry that was hidden is now a face set.

I think it may be related to

Event Timeline

Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Aug 28 2020, 6:27 AM

Does this happen with development builds?

yes it does, I think it happens more easily whenever you add a lot of geometry and undo it.

I managed to do it consistenly. ill update the description of the bug

Diogo Valadares Reis dos Santos (DiogoX2) changed the task status from Needs Information from User to Needs Triage.Aug 28 2020, 5:59 PM

I was able to reproduce this issue, so I will merge T77974 to this report. Steps are nearly identical.

I will remove "enter sculpt mode and enable dyntopo" step, because it is already done in file and therefore not necessary to reproduce.