bpy.ops.gpencil.vertex_group_assign() doesn't work when invoked from the python console #74538

New Issue

Marcelo Demian Gómez · 2020-03-08T03:27:21+01:00

2020-03-08 03:27:21 +01:00

System Information
Operating system: Linux-5.3.0-40-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: 77d23b0bd7
Worked: (optional)

Short description of error
Having a GP object in Edit Mode with selected vertices and an active vertex group and invoking the bpy.ops.gpencil.vertex_group_assign() operator
from the python console or a script fails to assign the selected vertices to the active vertex group. This also happens in the greasepencil-object branch.

Exact steps for others to reproduce the error
1)Start blender.
2)Add a GP object.
3) Create a stroke.
4) Create a vertex group.
5) Tab into edit mode.
6) Select some vertices.
7) In the python console type bpy.ops.gpencil.vertex_group_assign()

The selected vertices are not assigned to the active vertex group.

**System Information** Operating system: Linux-5.3.0-40-generic-x86_64-with-debian-buster-sid 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21 **Blender Version** Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: `77d23b0bd7` Worked: (optional) **Short description of error** Having a GP object in Edit Mode with selected vertices and an active vertex group and invoking the bpy.ops.gpencil.vertex_group_assign() operator from the python console or a script fails to assign the selected vertices to the active vertex group. This also happens in the greasepencil-object branch. **Exact steps for others to reproduce the error** 1)Start blender. 2)Add a GP object. 3) Create a stroke. 4) Create a vertex group. 5) Tab into edit mode. 6) Select some vertices. 7) In the python console type bpy.ops.gpencil.vertex_group_assign() The selected vertices are not assigned to the active vertex group.

Marcelo Demian Gómez commented

2020-03-08 03:27:21 +01:00

Added subscriber: @MarceloGomez

Richard Antalik commented

2020-03-10 15:43:40 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-03-10 15:43:40 +01:00

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

Richard Antalik closed this issue

2020-03-10 15:43:40 +01:00

Richard Antalik self-assigned this 2020-03-10 15:43:40 +01:00

Richard Antalik commented

2020-03-10 15:43:40 +01:00

You need to override context for this operator, see https://docs.blender.org/api/current/bpy.ops.html#overriding-context

Jonathan Julou commented

2022-10-12 12:17:31 +02:00

Added subscriber: @Ornibulon

Jonathan Julou commented

2022-10-12 12:17:31 +02:00

Blender version: 3.3.1 master b292cfe5a9

Tried overriding context and stuff, whatever I test, no problem with operators in bpy.ops.object and bpy.ops.view3d, but operators in bpy.ops.gpencil either execute successfully but don't affect the scene or fail with incorrect context while contect seems coherent with the documentation.

example:

import bpy
from bpy import context

override = bpy.context.copy()
area = [area for area in bpy.context.screen.areas if area.type == "VIEW_3D"][0]
override['area'] = area
override['region'] = area.regions[-1]
override['space_data'] = area.spaces.active

with context.temp_override(**override):
    # makes overriden area gpencil edit mode
    bpy.ops.object.mode_set(mode='EDIT_GPENCIL')
    # displays the toolbar
    bpy.ops.wm.toolbar()
    # changes the view
    bpy.ops.view3d.view_camera()
    # doesn't smooth, no python error
    bpy.ops.gpencil.stroke_smooth()
    # doesn't affect selection, no python error
    bpy.ops.gpencil.select_all(action='SELECT')
    # fails with incorrect context
    bpy.ops.gpencil.delete(type='POINTS')

Scene was just a grease pencil stroke, I had selected a few points in edit mode before switching to object mode before running the script.

I am not familiar with context override so that's probably the reason, if someone stumbles on this again could they explain a bit more what Richard Antalik (ISS) meant ?
thanks

Blender version: 3.3.1 master b292cfe5a936 Tried overriding context and stuff, whatever I test, no problem with operators in bpy.ops.object and bpy.ops.view3d, but operators in bpy.ops.gpencil either execute successfully but don't affect the scene or fail with incorrect context while contect seems coherent with the documentation. example: ``` import bpy from bpy import context override = bpy.context.copy() area = [area for area in bpy.context.screen.areas if area.type == "VIEW_3D"][0] override['area'] = area override['region'] = area.regions[-1] override['space_data'] = area.spaces.active with context.temp_override(**override): # makes overriden area gpencil edit mode bpy.ops.object.mode_set(mode='EDIT_GPENCIL') # displays the toolbar bpy.ops.wm.toolbar() # changes the view bpy.ops.view3d.view_camera() # doesn't smooth, no python error bpy.ops.gpencil.stroke_smooth() # doesn't affect selection, no python error bpy.ops.gpencil.select_all(action='SELECT') # fails with incorrect context bpy.ops.gpencil.delete(type='POINTS') ``` Scene was just a grease pencil stroke, I had selected a few points in edit mode before switching to object mode before running the script. I am not familiar with context override so that's probably the reason, if someone stumbles on this again could they explain a bit more what Richard Antalik (ISS) meant ? thanks

Richard Antalik commented

2022-10-12 20:32:16 +02:00

@Ornibulon Usually you need to override area and region which seems you have done. If above doesn't work, it could be a bug, so you can make new report for this. But I would encourage you to discuss such issues on one of the community websites: https://www.blender.org/community/

We do not handle user support on this tracker.

@Ornibulon Usually you need to override area and region which seems you have done. If above doesn't work, it could be a bug, so you can make new report for this. But I would encourage you to discuss such issues on one of the community websites: https://www.blender.org/community/ We do not handle user support on this tracker.

Jonathan Julou commented

2022-10-17 10:59:59 +02:00

ok thanks a lot!
I'll try a bit more and discuss it there.

ok thanks a lot! I'll try a bit more and discuss it there.

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bpy.ops.gpencil.vertex_group_assign() doesn't work when invoked from the python console #74538