Crash running transform.translate operator on IK bone #82484

New Issue

(disabled) · 2020-11-07T12:10:15+01:00

(disabled) commented

2020-11-07 12:10:15 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 950/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.75

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: 3e85bb34d0
Bug also in my latest build of 9af6c041e8, debugger shows t->region->regiondata is NULL here (transform.c) .

Short description of error
As by title. The reason is the missing region in overriden context. Your example in bpy.ops should take that into account.

Exact steps for others to reproduce the error

Open the attached blend
Run the script in fron of you

crash_missing_region_in_override.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 950/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.75 **Blender Version** Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: `3e85bb34d0` Bug also in my latest build of 9af6c041e8fc2f32d9db53b7821111ca724ead17, debugger shows `t->region->regiondata` is NULL [here (transform.c) ](https://developer.blender.org/diffusion/B/browse/master/source/blender/editors/transform/transform.c$89) . **Short description of error** As by title. The reason is the missing region in overriden context. Your example in [bpy.ops ](https://docs.blender.org/api/current/bpy.ops.html#execution-context) should take that into account. **Exact steps for others to reproduce the error** 1. Open the attached blend 2. Run the script in fron of you [crash_missing_region_in_override.blend](https://archive.blender.org/developer/F9227089/crash_missing_region_in_override.blend)

(disabled) commented

2020-11-07 12:10:15 +01:00

Added subscriber: @alefor

Robert Guetzkow commented

2020-11-07 15:17:05 +01:00

Added subscriber: @rjg

Robert Guetzkow commented

2020-11-07 15:17:05 +01:00

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

Robert Guetzkow closed this issue

2020-11-07 15:17:05 +01:00

Robert Guetzkow self-assigned this 2020-11-07 15:17:05 +01:00

Robert Guetzkow commented

2020-11-07 15:17:05 +01:00

If you are overriding the context, you need to know exactly what you're doing. It's very easy to supply an incomplete or wrong context that will make Blender try to access the wrong data or dereference a pointer that isn't actually pointing to the expected context data. Not every operator requires the same information, the context that is required depends on the particular operator that is used. In this case it's very noticeable that Blender's Python API is only wrapping C and C++ code and all warnings from the Gotcha section apply. Additionally, using bpy.ops.transform.translate for translating bones via Python is most likely not the right approach for what you're trying to do.

You can get and set the location of the pose bones without any operators, e.g. like this for moving them along the x-axis:

import bpy

armature = bpy.context.scene.objects["Armature"]

for pose_bone in armature.pose.bones:
    pose_bone.location[0] = pose_bone.location[0] + 0.5

I don't know exactly what you goal with the script was, so the right solution for your problem might need a different approach.

If you need help learning or using Blender, please post a question on one of our [community websites ]], for instance https:*blender.stackexchange.com/ , https:*blenderartists.org/ or the [ https:*blender.chat/channel/support | #support channel on Blender chat . The bug tracker is only for bug reports.

If you are overriding the context, you need to know exactly what you're doing. It's very easy to supply an incomplete or wrong context that will make Blender try to access the wrong data or dereference a pointer that isn't actually pointing to the expected context data. Not every operator requires the same information, the context that is required depends on the particular operator that is used. In this case it's very noticeable that Blender's Python API is only wrapping C and C++ code and all warnings from the [Gotcha ](https://docs.blender.org/api/current/info_gotcha.html#help-my-script-crashes-blender) section apply. Additionally, using `bpy.ops.transform.translate` for translating bones via Python is most likely not the right approach for what you're trying to do. You can get and set the location of the pose bones without any operators, e.g. like this for moving them along the x-axis: ``` import bpy armature = bpy.context.scene.objects["Armature"] for pose_bone in armature.pose.bones: pose_bone.location[0] = pose_bone.location[0] + 0.5 ``` I don't know exactly what you goal with the script was, so the right solution for your problem might need a different approach. If you need help learning or using Blender, please post a question on one of our [community websites ]], for instance [[ https:*blender.stackexchange.com/ | Blender's StackExchange ]], [[ https:*blenderartists.org/ | blenderartists.org ]] or the [[ https:*blender.chat/channel/support | #support channel on Blender chat ](https:*www.blender.org/community/). The bug tracker is only for bug reports.

Robert Guetzkow commented

2020-11-07 15:28:30 +01:00

Added subscriber: @Blendify

Robert Guetzkow commented

2020-11-07 15:28:30 +01:00

@Blendify We might want to add a warning box in the context override section for this kind of issue, since it is really easy to get this wrong.

(disabled) commented

2020-11-07 15:42:55 +01:00

Removed subscriber: @alefor

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Crash running transform.translate operator on IK bone #82484