Remeshing object with subdivision modifier hangs Blender #86072

New Issue

Kuzey · 2021-02-28T05:39:51+01:00

Kuzey commented

2021-02-28 05:39:51 +01:00

System Information
Operating system: macOS 10.14.6
Graphics card:

Blender Version
Broken: All versions of Blender but tested on Version 2.93.0 (2.93.0 2021-02-25) & Version 2.92.0 (2.92.0 2021-02-25)
Worked: ?

Short description of error
Remeshing object with subdivision modifier hangs Blender
Exact steps for others to reproduce the error
1 Add a subdivision modifier to the default cube, set it to 2 or more.
2 Jump into Sculpt mode and remesh with default voxel settings, it should work fine.
3 Undo the last remesh and now change the voxel size to 0.002 m and remesh again, it hangs.

Do step 1 again, this time apply subdivision modifier and then try to remesh with voxel size of 0.002 m, it should work

**System Information** Operating system: macOS 10.14.6 Graphics card: **Blender Version** Broken: All versions of Blender but tested on Version 2.93.0 (2.93.0 2021-02-25) & Version 2.92.0 (2.92.0 2021-02-25) Worked: ? **Short description of error** Remeshing object with subdivision modifier hangs Blender **Exact steps for others to reproduce the error** 1 Add a subdivision modifier to the default cube, set it to 2 or more. 2 Jump into Sculpt mode and remesh with default voxel settings, it should work fine. 3 Undo the last remesh and now change the voxel size to 0.002 m and remesh again, it hangs. Do step 1 again, this time apply subdivision modifier and then try to remesh with voxel size of 0.002 m, it should work ![blenremesh2.jpg](https://archive.blender.org/developer/F9850222/blenremesh2.jpg) ![blenremesh.jpg](https://archive.blender.org/developer/F9850224/blenremesh.jpg)

Kuzey commented

2021-02-28 05:39:51 +01:00

Added subscriber: @kuzey

Falk David commented

2021-03-01 11:29:57 +01:00

Added subscriber: @filedescriptor

Falk David commented

2021-03-01 11:29:57 +01:00

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

Falk David commented

2021-03-01 11:29:57 +01:00

I can confirm this on the latest 2.93.0 Alpha, branch: master, commit date: 2021-03-01 06:12, hash: bfc70a6a95.

Note: I get a crash at BLI_assert failed: source/blender/blenkernel/intern/pbvh.c:2804, BKE_pbvh_vert_coords_apply(), at '!"PBVH: Given deforming vcos number does not natch PBVH vertex number!"' when I undo on step 3 with a debug build.

I can confirm this on the latest 2.93.0 Alpha, branch: master, commit date: 2021-03-01 06:12, hash: `bfc70a6a95`. *Note:* I get a crash at `BLI_assert failed: source/blender/blenkernel/intern/pbvh.c:2804, BKE_pbvh_vert_coords_apply(), at '!"PBVH: Given deforming vcos number does not natch PBVH vertex number!"'` when I undo on step 3 with a debug build.

Falk David commented

2021-03-01 11:35:55 +01:00

Also, after Blender tries to consume all of my memory, I get this report from ASAN: P2001.

Also, after Blender tries to consume all of my memory, I get this report from ASAN: [P2001](https://archive.blender.org/developer/P2001.txt).

Kuzey commented

2021-03-03 03:36:31 +01:00

Update:

This also happens with the subdivision + remesh modifiers (I'm not sure if I should make a new bug report, but it seems related, so I'll just add it here for now).

Step 1: Add a subdivision modifier to the default cube, set it to 2.
Step 2: Add a remesh modifier set it to .002m voxel size

works fine.

Step 3: Now move the remesh modifier to the top of the stack and Blender hangs

Cheers

Update: This also happens with the subdivision + remesh modifiers (I'm not sure if I should make a new bug report, but it seems related, so I'll just add it here for now). Step 1: Add a subdivision modifier to the default cube, set it to 2. Step 2: Add a remesh modifier set it to .002m voxel size works fine. Step 3: Now move the remesh modifier to the top of the stack and Blender hangs Cheers

Julien Kaspar commented

2022-05-12 13:53:40 +02:00

Added subscriber: @JulienKaspar

Julien Kaspar commented

2022-05-12 13:53:40 +02:00

Since the remesher creates a 6 million vertices mesh it would realistically not be able to handle a subdiv modifier set to level 2.
This crash even happens outside of sculpt mode.

I'd tag this as a known issue. There are many occasions where you could accidentally use operations that create/use a too high vertex counts and Blender hangs/crashes.
We need to implement warning messages to prevent users from doing this.

Since the remesher creates a 6 million vertices mesh it would realistically not be able to handle a subdiv modifier set to level 2. This crash even happens outside of sculpt mode. I'd tag this as a known issue. There are many occasions where you could accidentally use operations that create/use a too high vertex counts and Blender hangs/crashes. We need to implement warning messages to prevent users from doing this.

Philipp Oeser removed the

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Remeshing object with subdivision modifier hangs Blender #86072