Python operator material_slot_assign() doesn't work in 2.91 alpha #80597

New Issue

Aleksi Tuomela · 2020-09-08T15:48:36+02:00

Aleksi Tuomela commented

2020-09-08 15:48:36 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.92

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-04 21:32, hash: cf0ba59e31
Worked: 2.90

Short description of error
When using the "assign" button from the UI in edit mode ("assign active material to slot" in the material properties) it works as expected, but when using bpy.ops.object.material_slot_assign() from the python console, it only outputs {'CANCELLED'} instead of {'FINISHED'} like in 2.90.

User Iceythe on Blenderartists thought it might have to do with Campbell's work on material assigning here: https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/render/render_shading.c%24273

"Can confirm it worked on 2.90 alpha and does not work on 2.91. Campbell worked on the material assign operator just a week ago and most notably the line 273 is a call to a function that tries to fetch objects based on “context.area” being the properties editor.
You can override with area set to the properties editor, but I’d call that a regression in any case."//

Exact steps for others to reproduce the error

startup blend
make a second material slot for the default cube (with a new material also), leave the new slot selected
go to edit mode, select 1 face
switch to scripting workspace
type bpy.ops.object.material_slot_assign() to the console, hit enter
the face doesn't get assigned to the 2nd material slot

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.92 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-04 21:32, hash: `cf0ba59e31` Worked: 2.90 **Short description of error** When using the "assign" button from the UI in edit mode ("assign active material to slot" in the material properties) it works as expected, but when using bpy.ops.object.material_slot_assign() from the python console, it only outputs {'CANCELLED'} instead of {'FINISHED'} like in 2.90. User Iceythe on Blenderartists thought it might have to do with Campbell's work on material assigning here: https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/render/render_shading.c%24273 > "Can confirm it worked on 2.90 alpha and does not work on 2.91. Campbell worked on the material assign operator just a week ago and most notably the line 273 is a call to a function that tries to fetch objects based on “context.area” being the properties editor. > You can override with area set to the properties editor, but I’d call that a regression in any case."// **Exact steps for others to reproduce the error** - startup blend - make a second material slot for the default cube (with a new material also), leave the new slot selected - go to edit mode, select 1 face - switch to scripting workspace - type bpy.ops.object.material_slot_assign() to the console, hit enter - the face doesn't get assigned to the 2nd material slot

Aleksi Tuomela commented

2020-09-08 15:48:36 +02:00

Added subscriber: @AleksiTuomela

Germano Cavalcante commented

2020-09-11 16:11:54 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-09-11 16:11:54 +02:00

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

Germano Cavalcante closed this issue

2020-09-11 16:11:54 +02:00

Germano Cavalcante self-assigned this 2020-09-11 16:11:54 +02:00

Germano Cavalcante commented

2020-09-11 16:11:54 +02:00

bpy.ops.object.material_slot_assign() is one of the operators that requires to be called in a specific context.
When called on the console, it does not decide which scene, view3d, objects to use in the operation.
It is possible to get around this, but the bug tracker is not the right place to talk about it.

For help using Blender, please try one of the community websites: https://www.blender.org/community/

`bpy.ops.object.material_slot_assign()` is one of the operators that requires to be called in a specific context. When called on the console, it does not decide which scene, view3d, objects to use in the operation. It is possible to get around this, but the bug tracker is not the right place to talk about it. For help using Blender, please try one of the community websites: https://www.blender.org/community/

Germano Cavalcante commented

2020-09-11 16:18:31 +02:00

Changed status from 'Archived' to: 'Confirmed'

Germano Cavalcante reopened this issue

2020-09-11 16:18:31 +02:00

Germano Cavalcante removed their assignment 2020-09-11 16:18:31 +02:00

Germano Cavalcante commented

2020-09-11 16:18:31 +02:00

Added subscriber: @ideasman42

Germano Cavalcante commented

2020-09-11 16:18:31 +02:00

In the second analysis, this used to work.
Perhaps now it is a limitation, but since it is a regression I think it is worth taking a look.

Regression introduced in 1a650fdcb2

In the second analysis, this used to work. Perhaps now it is a limitation, but since it is a regression I think it is worth taking a look. Regression introduced in 1a650fdcb2

Campbell Barton self-assigned this 2020-09-15 02:56:49 +02:00

blender-admin commented

2020-09-15 03:50:46 +02:00

This issue was referenced by 61cd0d5bd5

This issue was referenced by 61cd0d5bd58115741e0089adf56ac42e5c79d96d

Campbell Barton commented

2020-09-15 03:57:43 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2020-09-15 03:57:43 +02:00

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Python operator material_slot_assign() doesn't work in 2.91 alpha #80597