crash when running python in background mode and calling region_3d.update() #102738

New Issue

Firas · 2022-11-24T08:15:20+01:00

Firas commented

2022-11-24 08:15:20 +01:00

System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 526.86

Blender Version
Broken: version: 3.5.0 Alpha, branch: master, commit date: 2022-11-23 18:35, hash: f4e1f62c62

Short description of error
I need to run a python script in background mode, without GUI. The purpose is to unwrap uv from top view of some loaded object & texture. To do that, I use the project_from_view operation after setting the view to TOP. As I saw in the forums, I need to run region_3d.update() between those calls so that the top view operation takes effect, and calling this function crashes blender with EXCEPTION_ACCESS_VIOLATION .
Note that running this code while Blender is open, worksperfectly, however, when I run it in background mode it crashes

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]

use the attached small script. called crash_repro.py
use any simple scene, attached .blend file with cube for example, called untitled.blend
open command line and run:

blender.exe untitled.blend --background --python crash_repro.py

blender should crash with a crash report, attached a sample, showing that the update() is to blame.

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 526.86 **Blender Version** Broken: version: 3.5.0 Alpha, branch: master, commit date: 2022-11-23 18:35, hash: `f4e1f62c62` **Short description of error** I need to run a python script in background mode, without GUI. The purpose is to unwrap uv from top view of some loaded object & texture. To do that, I use the project_from_view operation after setting the view to TOP. As I saw in the forums, I need to run region_3d.update() between those calls so that the top view operation takes effect, and calling this function crashes blender with EXCEPTION_ACCESS_VIOLATION . Note that running this code while Blender is open, **works**perfectly, however, when I run it in background mode it crashes **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] 1. use the attached small script. called crash_repro.py 2. use any simple scene, attached .blend file with cube for example, called untitled.blend 3. open command line and run: ``` blender.exe untitled.blend --background --python crash_repro.py ``` blender should crash with a crash report, attached a sample, showing that the update() is to blame. [untitled.blend](https://archive.blender.org/developer/F13964916/untitled.blend) [untitled.crash.txt](https://archive.blender.org/developer/F13964915/untitled.crash.txt) [crash_repro.py.txt](https://archive.blender.org/developer/F13964914/crash_repro.py.txt) [crash_repro.py](https://archive.blender.org/developer/F13964913/crash_repro.py)

Firas commented

2022-11-24 08:15:20 +01:00

Added subscriber: @Firasshama

Germano Cavalcante commented

2022-11-24 17:20:23 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-11-24 17:20:23 +01:00

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

Germano Cavalcante commented

2022-11-24 17:20:23 +01:00

The crash is because Space.region_3d.update() internally calls the GPU API without having GPU context.
(See view3d_winmatrix_set, GPU_matrix_ortho_set, or GPU_matrix_frustum_set).

The crash is because `Space.region_3d.update()` internally calls the GPU API without having GPU context. (See `view3d_winmatrix_set`, `GPU_matrix_ortho_set`, or `GPU_matrix_frustum_set`).

Raimund Klink commented

2022-11-30 09:32:54 +01:00

Added subscriber: @Raimund58

Philipp Oeser removed the

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crash when running python in background mode and calling region_3d.update() #102738