Python operator material_slot_assign() doesn't work in 2.91 alpha #80597
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Reference: blender/blender#80597
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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
Exact steps for others to reproduce the error
Added subscriber: @AleksiTuomela
Added subscriber: @mano-wii
Changed status from 'Needs Triage' to: 'Archived'
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/
Changed status from 'Archived' to: 'Confirmed'
Added subscriber: @ideasman42
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
This issue was referenced by
61cd0d5bd5
Changed status from 'Confirmed' to: 'Resolved'