RuntimeError on bpy.ops.object.mode_set if executed from terminal but works in blender's text editor #92464

New Issue

Jonathan Mafi · 2021-10-25T06:35:43+02:00

Jonathan Mafi commented

2021-10-25 06:35:43 +02:00

System Information
Operating system: Linux-5.4.0-84-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: NVIDIA GeForce GTX 780/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.63.01

Blender Version
Broken: version: 2.93.2, branch: master, commit date: 2021-08-03 05:58, hash: 1eb06de260

Short description of error
When changing armature mode from python script executed via terminal it errors on the mode_set method

RuntimeError: Operator bpy.ops.object.mode_set.poll() failed, context is incorrect

NOTE: this isn't a problem if the python file is run from the text editor within blender.

Exact steps for others to reproduce the error

Create a python module test.py
After standard import of bpy and open_mainfile method to open a file with basic rig. Add these two lines.

bpy.data.objects['MyRig'].select_set(True) # Where "MyRig" is the name of rig in file.
bpy.ops.object.mode_set(mode='EDIT')  # fails on this line

Launch python via commandline:

 "directory/to/blender-2.93.2-linux-x64/blender" -P "test.py"

MyRig_Test.blend

**System Information** Operating system: Linux-5.4.0-84-generic-x86_64-with-glibc2.31 64 Bits Graphics card: NVIDIA GeForce GTX 780/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.63.01 **Blender Version** Broken: version: 2.93.2, branch: master, commit date: 2021-08-03 05:58, hash: `1eb06de260` **Short description of error** When changing armature mode from python script executed via terminal it errors on the **mode_set** method > RuntimeError: Operator bpy.ops.object.mode_set.poll() failed, context is incorrect **NOTE:** this isn't a problem if the python file is run from the text editor within blender. **Exact steps for others to reproduce the error** 1. Create a python module test.py 2. After standard import of bpy and open_mainfile method to open a file with basic rig. Add these two lines. ``` bpy.data.objects['MyRig'].select_set(True) # Where "MyRig" is the name of rig in file. bpy.ops.object.mode_set(mode='EDIT') # fails on this line ``` 3. Launch python via commandline: ``` "directory/to/blender-2.93.2-linux-x64/blender" -P "test.py" ``` [MyRig_Test.blend](https://archive.blender.org/developer/F11481344/MyRig_Test.blend)

Jonathan Mafi commented

2021-10-25 06:35:43 +02:00

Added subscriber: @jmafi3d

blender-admin commented

2021-10-25 06:35:43 +02:00

#100446 was marked as duplicate of this issue

Jonathan Mafi changed title from ~~Error on bpy.ops.object.mode_set if blender python executed from terminal~~ to RuntimeError on bpy.ops.object.mode_set if blender python executed from terminal

2021-10-25 12:09:35 +02:00

Jonathan Mafi changed title from ~~RuntimeError on bpy.ops.object.mode_set if blender python executed from terminal~~ to RuntimeError on bpy.ops.object.mode_set if blender python executed from terminal but works in blender text editor

2021-10-25 12:09:55 +02:00

Jonathan Mafi changed title from ~~RuntimeError on bpy.ops.object.mode_set if blender python executed from terminal but works in blender text editor~~ to RuntimeError on bpy.ops.object.mode_set if executed from terminal but works in blender's text editor

2021-10-25 12:10:18 +02:00

Richard Antalik commented

2021-10-26 05:44:37 +02:00

Added subscriber: @iss

Richard Antalik commented

2021-10-26 05:44:37 +02:00

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

Richard Antalik commented

2021-10-26 05:44:37 +02:00

In 3.0 I get error RuntimeError: Operator bpy.ops.object.mode_set.poll() Context missing active object, but can confirm the issue.

In 3.0 I get error `RuntimeError: Operator bpy.ops.object.mode_set.poll() Context missing active object`, but can confirm the issue.

Jonathan Mafi commented

2021-10-26 06:21:08 +02:00

In relation to the missing active object. I should note that i tried varoius other methods explicitly setting the active object first, also used toggle method as wel, but still had the same approximate context issue.

Borut commented

2021-10-29 14:07:28 +02:00

Added subscriber: @BorutBalazek

Borut commented

2021-10-29 14:07:28 +02:00

Hey Jonathan, did you find a workaround for this?

I've been experiencing the same issue on 2.93.0.

Hey Jonathan, did you find a workaround for this? I've been experiencing the same issue on 2.93.0.

Jonathan Mafi commented

2021-10-29 14:22:16 +02:00

No I have not. Keen to look into it from the source code side but cant get blender build working XD.

Jonathan Mafi commented

2021-10-30 10:53:02 +02:00

Hey @BorutBalazek

I found a workaround.... It helps in my case but wont help with others if they require file changing during the process.

Remove the file open from within the python code and put it direct into the shell process
../blender ../MyRig_Test.blend -P .../test.py
Cant believe i didnt think of it at the start...
But as mentioned not useful for pipelines that require more dynamic changing of files via python. So still a bug.

Opening the blend file via shell must sort the context out in advance somehow that python open_mainfile doesnt?

Hope that helps sort troubleshoot. I've got blender building from source now so if i have some time ill jump in and have a look around. If someone can tell me where i should be looking specifically it would help :D even some rough documentation.

Hey @BorutBalazek I found a workaround.... It helps in my case but wont help with others if they require file changing during the process. Remove the file open from within the python code and put it direct into the shell process ../blender ../MyRig_Test.blend -P .../test.py Cant believe i didnt think of it at the start... But as mentioned not useful for pipelines that require more dynamic changing of files via python. So still a bug. Opening the blend file via shell must sort the context out in advance somehow that python open_mainfile doesnt? Hope that helps sort troubleshoot. I've got blender building from source now so if i have some time ill jump in and have a look around. If someone can tell me where i should be looking specifically it would help :D even some rough documentation.

Borut commented

2021-10-30 11:13:28 +02:00

Hey @jmafi3d,

I didn't even fully check your initial description, but I actually do open the file as a part of the CLI command, but still experience the same issue (in addition I also run it in --background mode). For me, it basically always breaks if I trigger any of the following commands: bpy.ops.object.mode_set(), bpy.ops.mesh.select_all() and bpy.ops.uv.smart_project().

Thanks anyway! Hopefully, this gets fixed soon!

Hey @jmafi3d, I didn't even fully check your initial description, but I actually do open the file as a part of the CLI command, but still experience the same issue (in addition I also run it in --background mode). For me, it basically always breaks if I trigger any of the following commands: `bpy.ops.object.mode_set()`, `bpy.ops.mesh.select_all()` and `bpy.ops.uv.smart_project()`. Thanks anyway! Hopefully, this gets fixed soon!

blender-admin commented

2021-11-02 11:57:23 +01:00

This issue was referenced by 9bd97e62ad

This issue was referenced by 9bd97e62ade417f6b4025acbad46802c3e7e5683

Campbell Barton commented

2021-11-02 12:03:39 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2021-11-02 12:03:39 +01:00

Campbell Barton self-assigned this 2021-11-02 12:03:39 +01:00

blender-admin commented

2021-11-05 03:26:25 +01:00

This issue was referenced by 50b0503a11

This issue was referenced by 50b0503a110b8159fe7a30645d7a2ebbf518860f

Campbell Barton commented

2021-11-05 03:52:14 +01:00

Changed status from 'Resolved' to: 'Confirmed'

Campbell Barton reopened this issue

2021-11-05 03:52:14 +01:00

Campbell Barton commented

2021-11-05 03:52:14 +01:00

The fixed caused #92818, reverted & re-opening.

Borut commented

2021-11-05 06:56:37 +01:00

Hey @ideasman42, I'm not really familiar with the blender source code, but could you think of any workaround for this?

Specifically, in my case, I want to smart unwrap (if no UV map is not present), bake the materials into textures and then export them (the export works, but doesn't help a lot). Neither of those steps really work, because I guess bpy.ops.object.bake() also relies on the same mechanism.

So I was just thinking if it's still possible to do it somehow in a hacky way?

Hey @ideasman42, I'm not really familiar with the blender source code, but could you think of any workaround for this? Specifically, in my case, I want to smart unwrap (if no UV map is not present), bake the materials into textures and then export them (the export works, but doesn't help a lot). Neither of those steps really work, because I guess `bpy.ops.object.bake()` also relies on the same mechanism. So I was just thinking if it's still possible to do it somehow in a hacky way?

Campbell Barton commented

2021-11-05 14:51:05 +01:00

Hi @BorutBalazek, I'm proposing D13126 as an alternative solution.

Hi @BorutBalazek, I'm proposing [D13126](https://archive.blender.org/developer/D13126) as an alternative solution.

Campbell Barton commented

2022-04-20 04:25:15 +02:00

D13126 has been committed. Closing.

[D13126](https://archive.blender.org/developer/D13126) has been committed. Closing.

Campbell Barton commented

2022-04-20 04:25:31 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue