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Maniphest T82851

Undo bug while sculpting
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2020-11-19 16:19, hash: rB72a199e148b2
Worked: (newest version of Blender that worked as expected)

Short description of error
When using undo during sculpting, both the last stroke and the last subdivision level are canceled at the same time.

Exact steps for others to reproduce the error
1 - With the default General scene, got to Sculpt Mode
2 - Add multiresolution
3 - Add a few levels of subdivision
4 - Make a stroke
5 - Press Ctrl+Z (nothing happens)
6 - Press Ctrl+Z again (Both stroke and add last subd level canceled)

The problem occurs only when you try to undo the first stroke after adding a subdivision layer

Related Objects

Event Timeline

Sergey (borschberry) created this task.Nov 19 2020, 7:33 PM
TheRedWaxPolice (TheRedWaxPolice) added a subscriber: TheRedWaxPolice (TheRedWaxPolice).Nov 19 2020, 8:31 PM

Yeah, I reported a similar issue here... T82388#1056677

Germano Cavalcante (mano-wii) updated the task description. (Show Details)Nov 20 2020, 3:54 PM
Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Confirmed.Nov 20 2020, 3:56 PM
Germano Cavalcante (mano-wii) changed the subtype of this task from "Report" to "Bug".
Germano Cavalcante (mano-wii) added projects: Sculpt, Paint & Texture, Pipeline, Assets & I/O.
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).

I can confirm.

Bastien Montagne (mont29) claimed this task.Nov 23 2020, 10:54 AM
Bastien Montagne (mont29) moved this task from Backlog to Blender 2.92 on the Pipeline, Assets & I/O board.
Bastien Montagne (mont29) added a subscriber: Bastien Montagne (mont29).

@TheRedWaxPolice (TheRedWaxPolice) much better to have a new report, easier to keep track of things...

But indeed almost certainly same root issue as in T82388, will check.

Bastien Montagne (mont29) edited projects, added BF Blender (2.92); removed BF Blender.Nov 25 2020, 5:20 PM
Bastien Montagne (mont29) moved this task from Backlog to bcon3: Bugs on the BF Blender (2.92) board.
Bastien Montagne (mont29) added a comment.Nov 30 2020, 8:04 PM

OK, so don't think this is related to previous T82388 actually. Object and mesh do get re-read from memory as expected, yet the sculpt stroke remains visible.

Not sure what is going on here, not even sure how that is possible, since undoing (and re-reading object) should nuke all sculpting data. Could be related to how multires works... need more investigation work. :(

Gilberto Rodrigues (gilberto_rodrigues) added a subscriber: Gilberto Rodrigues (gilberto_rodrigues).EditedDec 6 2020, 3:33 AM

I think this could be related to my report. I also get multiple things undone at once, but in edit mode. https://developer.blender.org/T82991

Silas Opel (Schamph) awarded a token.Dec 11 2020, 4:40 PM
Bastien Montagne (mont29) mentioned this in T83806: Undo - Current Status and Important Fixes Needed.Dec 15 2020, 5:35 PM
Bastien Montagne (mont29) added a comment.Dec 15 2020, 6:44 PM

This is actually same issue as T82532: basically, first sculpt undo step will never be undone in current code (fact that it gets undone on redo is expected due to internal behavior of sculpt undo steps). New memfile undo does not cause any new issue here, it merely reveals existing ones, since it does not do a full complete re-read of the file data anymore, but typically only updates a few IDs.

See T83806.

Bastien Montagne (mont29) moved this task from Blender 2.92 to Bugs on the Pipeline, Assets & I/O board.Dec 16 2020, 4:17 PM
Bastien Montagne (mont29) edited projects, added BF Blender; removed BF Blender (2.92).
Bastien Montagne (mont29) mentioned this in rBL62534: UI test undo: add broken sculpt mode undo test..Dec 22 2020, 11:26 AM
Bastien Montagne (mont29) closed this task as a duplicate of T82532: Sculpt Redo does not always properly apply the first stroke of the sculpt session.Dec 30 2020, 2:29 PM