Regression: Disappearing mesh with cloth brush fresh multires modifier #103724

New Issue

Andrew Oates · 2023-01-07T23:25:01+01:00

Andrew Oates commented

2023-01-07 23:25:01 +01:00

Possibly related to #83040, though that is closed.

System Information
Operating system: macOS-10.13.6-x86_64-i386-64bit 64 Bits
Graphics card: NVIDIA GeForce GT 750M OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-10.32.0 355.11.10.10.40.102

Blender Version
Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-18 20:10, hash: ecf3435362
The behavior is different but also broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-15 18:14, hash: d5df23d758
Worked: version: 3.4.0 Alpha, branch: arcpatch-D15914, commit date: 2022-09-09 16:50, hash: e81a3c9536

Seems like this was caused by b5f7af31d6

Short description of error
When using the cloth brush on a freshly multires'd object, the touched part of the mesh disappears.

Exact steps for others to reproduce the error

create object (tested with UV sphere)
add multires modifier
subdivide several times
enter sculpt mode and use the cloth brush

If you use a different brush (e.g. grab), then subdivide, then cloth brush works as expected. So I suspect some data structure is being populated when another brush is used and subdivide is done.

Interestingly, if you trigger the bug (disappearing part of the mesh), then subdivide again, then the cloth brush works on other parts of the mesh, but doing it near the deleted portion causes more mesh to be deleted.

Possibly related to #83040, though that is closed. **System Information** Operating system: macOS-10.13.6-x86_64-i386-64bit 64 Bits Graphics card: NVIDIA GeForce GT 750M OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-10.32.0 355.11.10.10.40.102 **Blender Version** Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-18 20:10, hash: `ecf3435362` The behavior is different but also broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-15 18:14, hash: `d5df23d758` Worked: version: 3.4.0 Alpha, branch: arcpatch-[D15914](https://archive.blender.org/developer/D15914), commit date: 2022-09-09 16:50, hash: `e81a3c9536` Seems like this was caused by b5f7af31d6 **Short description of error** When using the cloth brush on a freshly multires'd object, the touched part of the mesh disappears. **Exact steps for others to reproduce the error** 1) create object (tested with UV sphere) 2) add multires modifier 3) subdivide several times 4) enter sculpt mode and use the cloth brush If you use a different brush (e.g. grab), then subdivide, then cloth brush works as expected. So I suspect some data structure is being populated when another brush is used and subdivide is done. Interestingly, if you trigger the bug (disappearing part of the mesh), then subdivide again, then the cloth brush works on _other_ parts of the mesh, but doing it near the deleted portion causes more mesh to be deleted.![Screen Shot 2023-01-07 at 5.19.21 PM.png](https://archive.blender.org/developer/F14132024/Screen_Shot_2023-01-07_at_5.19.21_PM.png)

Andrew Oates commented

2023-01-07 23:25:01 +01:00

Added subscriber: @aoates

blender-admin commented

2023-01-07 23:25:01 +01:00

#104229 was marked as duplicate of this issue

Iliya Katushenock changed title from ~~Disappearing mesh with cloth brush fresh multires modifier~~ to Regression: Disappearing mesh with cloth brush fresh multires modifier

2023-01-08 00:00:49 +01:00

Iliya Katushenock commented

2023-01-08 00:00:49 +01:00

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