Driver script which executes bpy.context.scene.update() crashes Blender #43385
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Reference: blender/blender#43385
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Blender 2.73,
b4d8fb5
Win7 x64
Driver script immediately crashes blender
When opening the attached file DriverCrash.blend, running the python script in the Text Editor via Ctrl-P, then pressing "Update Dependencies" in the Graph Editor, Blender will crash immediately.
When commenting out "bpy.context.scene.update()" Blender will not crash.
Here's the code for the driver:
import bpy
from math import *
My intention was that the text is automatically updated (showing the angle of the vector in realtime)
Changed status to: 'Open'
Added subscriber: @noone
Changed status from 'Open' to: 'Archived'
Thanks for the report, but no bug here, this is not, has never been and will never be intended to work. Modifying anything from within a driver expression is already a very bad idea, but calling scene.update() in that context is pure suicide!
As a rule of thumb, drivers shall only read data, never write anything.
PS: to update a text, you could rather add a callback to e.g. scene_update handlers (http://www.blender.org/api/blender_python_api_2_73_2/bpy.app.handlers.html).
Probably I should not assign the y location like this: bpy.data.objects["Text"].location- [x] = y and have the driver manipulate the same coordinate.
Still, Blender should not crash.
Sorry, I had not seen,that you already answered. Thanks for the information. I agree that I should not write a driver like this, but Blender shouldn't crash either... :)