Blender crashes upon subdivision (corrupt mesh) #68785

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Brandon Tsang · 2019-08-18T01:31:58+02:00

Brandon Tsang commented

2019-08-18 01:31:58 +02:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 960M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.36

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449
(Still broken as of version 2.81 commit e8ffe25eb1)

Short description of error
When using the subdivide operator, Blender immediately crashes. Bug only occurs on the plane object in attached file.material.blend

Exact steps for others to reproduce the error

Right click in 3D viewport
Click "Subdivide"

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce GTX 960M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.36 **Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: `f6cb5f5449` (Still broken as of version 2.81 commit e8ffe25eb111) **Short description of error** When using the subdivide operator, Blender immediately crashes. **Bug only occurs on the plane object in attached file.**[material.blend](https://archive.blender.org/developer/F7669682/material.blend) **Exact steps for others to reproduce the error** - Right click in 3D viewport - Click "Subdivide"

Brandon Tsang commented

2019-08-18 01:31:58 +02:00

Added subscriber: @brandononline2

Philipp Oeser commented

2019-08-19 10:45:16 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-08-19 10:45:16 +02:00

I can confirm a crash here, BUT:

The gormetry is invalid.
You can check this by calling .validate(verbose=True) on the Plane's .data. Comes out like this:

ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:690 BKE_mesh_validate_arrays: 	Polys 0 and 1 use same vertices (0
ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:692 BKE_mesh_validate_arrays: , 1
ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:692 BKE_mesh_validate_arrays: , 2
ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:692 BKE_mesh_validate_arrays: , 3
ERROR (bke.mesh): /blender/blenkernel/intern/mesh_validate.c:694 BKE_mesh_validate_arrays: ), considering poly 1 as invalid.
ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:766 BKE_mesh_validate_arrays: 	Loop 4 is unused.
ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:766 BKE_mesh_validate_arrays: 	Loop 5 is unused.
ERROR (bke.mesh): /blender/blenkernel/intern/mesh_validate.c:766 BKE_mesh_validate_arrays: 	Loop 6 is unused.
ERROR (bke.mesh): /blender/blenkernel/intern/mesh_validate.c:766 BKE_mesh_validate_arrays: 	Loop 7 is unused.

Once this is done (.validate()) will also cleanup the mesh, I am not getting a crash anymore.

So question is now: how did we get here?

is this mesh generated by python code? (in this case it is advisable to always run .validate() after creation in case code does something really weird accidentally)
was this imported? (if so, with which importer)?
has this been achieved by blender modeling tools? (if so: which one(s)?)

I can confirm a crash here, BUT: The gormetry is invalid. You can check this by calling `.validate(verbose=True)` on the Plane's .data. Comes out like this: ``` ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:690 BKE_mesh_validate_arrays: Polys 0 and 1 use same vertices (0 ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:692 BKE_mesh_validate_arrays: , 1 ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:692 BKE_mesh_validate_arrays: , 2 ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:692 BKE_mesh_validate_arrays: , 3 ERROR (bke.mesh): /blender/blenkernel/intern/mesh_validate.c:694 BKE_mesh_validate_arrays: ), considering poly 1 as invalid. ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:766 BKE_mesh_validate_arrays: Loop 4 is unused. ERROR (bke.mesh): /blender/source/blender/blenkernel/intern/mesh_validate.c:766 BKE_mesh_validate_arrays: Loop 5 is unused. ERROR (bke.mesh): /blender/blenkernel/intern/mesh_validate.c:766 BKE_mesh_validate_arrays: Loop 6 is unused. ERROR (bke.mesh): /blender/blenkernel/intern/mesh_validate.c:766 BKE_mesh_validate_arrays: Loop 7 is unused. ``` Once this is done (`.validate()`) will also cleanup the mesh, I am not getting a crash anymore. So question is now: how did we get here? - is this mesh generated by python code? (in this case it is advisable to always run `.validate()` after creation in case code does something really weird accidentally) - was this imported? (if so, with which importer)? - has this been achieved by blender modeling tools? (if so: which one(s)?)

Philipp Oeser changed title from ~~Blender crashes upon subdivision~~ to Blender crashes upon subdivision (corrupt mesh)

2019-08-19 10:45:34 +02:00

Brandon Tsang commented

2019-08-22 23:09:19 +02:00

The plane was created using Blender tools. I'm not entirely sure how I did this though. Sorry about that.