Problem with bpy.ops.object.material_slot_assign () when running a script from the console #70714

New Issue

AlexN · 2019-10-10T21:37:31+02:00

AlexN commented

2019-10-10 21:37:31 +02:00

System Information
Operating system: Linux-5.2.18-129.current-x86_64-with-glibc2.9 64 Bits
Graphics card: GeForce GTX 660/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.50

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449
Worked: (optional)

Short description of error
For automation I created a script from a sequence of actions which works great if I run it in the blender console window, or if i Run Script in a text editor.
But when I run this script through the command line without the graphical shell of the blender - he crashed.
If I exclude bpy.ops.object.material_slot_assign (), the script succeeds, except that the materials are not used.
Problem is repeated regardless of the platform, Windows or Linux, regardless of the PC used (3 different PCs).

Exact steps for others to reproduce the error
./blender -b -P /home/convert/script.txt

The error is reproduced even in the simplest example

import bpy
bpy.ops.object.editmode_toggle()
bpy.ops.mesh.select_all(action='SELECT')
bpy.context.object.active_material_index = 0
bpy.ops.object.material_slot_assign()

In a full script, everything is executed until it reaches the line bpy.ops.object.material_slot_assign ()
Without this line, the script completes successfully and the result is saved.
7.txt
And it does not depend on the assigned material.
I also attach an automatically generated file when the blender falls:
blender.crash.txt

**System Information** Operating system: Linux-5.2.18-129.current-x86_64-with-glibc2.9 64 Bits Graphics card: GeForce GTX 660/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.50 **Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: `f6cb5f5449` Worked: (optional) **Short description of error** For automation I created a script from a sequence of actions which works great if I run it in the blender console window, or if i Run Script in a text editor. But when I run this script through the command line without the graphical shell of the blender - he crashed. If I exclude bpy.ops.object.material_slot_assign (), the script succeeds, except that the materials are not used. Problem is repeated regardless of the platform, Windows or Linux, regardless of the PC used (3 different PCs). **Exact steps for others to reproduce the error** ./blender -b -P /home/convert/script.txt The error is reproduced even in the simplest example ``` import bpy bpy.ops.object.editmode_toggle() bpy.ops.mesh.select_all(action='SELECT') bpy.context.object.active_material_index = 0 bpy.ops.object.material_slot_assign() ``` In a full script, everything is executed until it reaches the line bpy.ops.object.material_slot_assign () Without this line, the script completes successfully and the result is saved. [7.txt](https://archive.blender.org/developer/F7803061/7.txt) And it does not depend on the assigned material. I also attach an automatically generated file when the blender falls: [blender.crash.txt](https://archive.blender.org/developer/F7803083/blender.crash.txt)

AlexN commented

2019-10-10 21:37:31 +02:00

Added subscriber: @Alex_N

Bastien Montagne commented

2019-10-11 11:57:40 +02:00

Added subscriber: @mont29

Bastien Montagne self-assigned this 2019-10-11 11:57:40 +02:00

Bastien Montagne commented

2019-10-11 11:57:40 +02:00

That operator is not designed to work without UI at all, it expects a valid 3DView from the context.

Will tweak the poll function of those ops to properly abort when this is not available, instead of crashing…

That operator is not designed to work without UI at all, it expects a valid 3DView from the context. Will tweak the poll function of those ops to properly abort when this is not available, instead of crashing…

Bastien Montagne commented

2019-10-11 12:05:52 +02:00

Hrmmm, actually it’s a bit more involved, not sure why we need view3d here, still digging.