Dissolve Faces can result in invalid geometry (leading to crashes on further modeling operators such as Subdivide Edges) #116217

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opened 2023-12-15 10:48:03 +01:00 by Alphonsus-Okoye · 2 comments

Alphonsus-Okoye commented

2023-12-15 10:48:03 +01:00

System Information
Operating system:
OS Name Microsoft Windows 10 Home
Version 10.0.19044 Build 19044

Graphics card:
GPU 0

Intel(R) Iris(R) Xe Graphics

Driver version:	27.20.100.8935
Driver date:	10/28/2020
DirectX version:	12 (FL 12.1)
Physical location:	PCI bus 0, device 2, function 0

Utilization	0%
Dedicated GPU memory	
Shared GPU memory	0.6/3.8 GB
GPU Memory	0.6/3.8 GB

Blender Version
Broken: (4.0.0, 878f71061b, blender-v4.0-release, 2023-11-13, as found on the splash screen)
Worked: *

Short description of error
After I made a square from a cube. Edge -> Subdivide operator is activated and tweaking the Number of Cuts in Adjust Last Operator panel crashes the system immediately.

Exact steps for others to reproduce the error
Based on the default startup .blend file,

Enter Edit Mode with Tab and select a face.
Invert selection Ctrl-I and dissolve the selected faces to leave just one square in the 3d viewport
Use the Edge -> Subdivide operator in Edit Mode
In the Adjust Last Operator panel try to increase the value of the Number of Cuts field by pressing the right arrow
The program crashes immediately. The crash txt file is uploaded. This also happened in Blender 3.6.5

**System Information** Operating system: OS Name Microsoft Windows 10 Home Version 10.0.19044 Build 19044 Graphics card: GPU 0 Intel(R) Iris(R) Xe Graphics Driver version: 27.20.100.8935 Driver date: 10/28/2020 DirectX version: 12 (FL 12.1) Physical location: PCI bus 0, device 2, function 0 Utilization 0% Dedicated GPU memory Shared GPU memory 0.6/3.8 GB GPU Memory 0.6/3.8 GB **Blender Version** Broken: (4.0.0, 878f71061b8e, blender-v4.0-release, 2023-11-13, as found on the splash screen) Worked: * **Short description of error** After I made a square from a cube. `Edge -> Subdivide` operator is activated and tweaking the `Number of Cuts` in Adjust Last Operator panel crashes the system immediately. **Exact steps for others to reproduce the error** Based on the default startup .blend file, 1. Enter Edit Mode with `Tab `and select a face. 2. Invert selection `Ctrl-I` and dissolve the selected faces to leave just one square in the 3d viewport 3. Use the `Edge -> Subdivide` operator in Edit Mode 4. In the `Adjust Last Operator` panel try to increase the value of the `Number of Cuts` field by pressing the right arrow 5. The program crashes immediately. The crash txt file is uploaded. This also happened in Blender 3.6.5

blender.crash.txt

23 KiB

Alphonsus-Okoye added the

labels 2023-12-15 10:48:03 +01:00

Iliya Katushenock added the

label 2023-12-15 10:48:51 +01:00

Philipp Oeser commented

2023-12-15 12:46:30 +01:00

Member

I can confirm.

The underlying problem is that step [2] actually creates 2 faces (bot using the same 4 vertices)

C.active_object.data.validate(verbose=True) then gives:

ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:701 BKE_mesh_validate_arrays: 	Polys 0 and 1 use same vertices (0
ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:703 BKE_mesh_validate_arrays: , 1
ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:703 BKE_mesh_validate_arrays: , 2
ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:703 BKE_mesh_validate_arrays: , 3
ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:705 BKE_mesh_validate_arrays: ), considering face 1 as invalid.
ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:782 BKE_mesh_validate_arrays: 	Loop 4 is unused.
ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:782 BKE_mesh_validate_arrays: 	Loop 5 is unused.
ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:782 BKE_mesh_validate_arrays: 	Loop 6 is unused.
ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:782 BKE_mesh_validate_arrays: 	Loop 7 is unused.

I can confirm. The underlying problem is that step [2] actually creates 2 faces (bot using the same 4 vertices) `C.active_object.data.validate(verbose=True)` then gives: ``` ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:701 BKE_mesh_validate_arrays: Polys 0 and 1 use same vertices (0 ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:703 BKE_mesh_validate_arrays: , 1 ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:703 BKE_mesh_validate_arrays: , 2 ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:703 BKE_mesh_validate_arrays: , 3 ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:705 BKE_mesh_validate_arrays: ), considering face 1 as invalid. ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:782 BKE_mesh_validate_arrays: Loop 4 is unused. ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:782 BKE_mesh_validate_arrays: Loop 5 is unused. ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:782 BKE_mesh_validate_arrays: Loop 6 is unused. ERROR (bke.mesh): source/blender/blenkernel/intern/mesh_validate.cc:782 BKE_mesh_validate_arrays: Loop 7 is unused. ```

Philipp Oeser changed title from ~~Attempts to increase the value in the <Number of Cuts> option crashes both blender 3.6.5 and 4.0.0~~ to Dissolve Faces can result in invalid geometry (leading to crashes on further modeling operators such as Subdivide Edges)

2023-12-15 12:49:50 +01:00

Philipp Oeser added

and removed

labels 2023-12-15 12:50:07 +01:00

Philipp Oeser referenced this issue

2023-12-15 12:59:06 +01:00

Dissolve can create duplicate faces / invalid geometry (leading to crashes on further modeling operators such as Subdivide Edges) #70977

Philipp Oeser commented

2023-12-15 13:01:11 +01:00

Member

Actually, this has been reported before, see #70977.

There is some discussion in #70977 as to whether or not you should be able to achieve such invalid geometry with blenders modeling tools (my clear vote is for blender to not ever result in such geometry).

Nevertheless, this is a duplicate, will close. Please subscribe in #70977 if you want further updates

Actually, this has been reported before, see #70977. There is some discussion in #70977 as to whether or not you should be able to achieve such invalid geometry with blenders modeling tools (my clear vote is for blender to not ever result in such geometry). Nevertheless, this is a duplicate, will close. Please subscribe in #70977 if you want further updates

Philipp Oeser closed this issue

2023-12-15 13:01:15 +01:00

Blender Bot added

and removed

labels 2023-12-15 13:01:17 +01:00

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Reference: blender/blender#116217

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