I'm not well versed in scripting and I'm trying to write a script that involves converting grease pencil to curve, I have discovered that the operator

bpy.ops.gpencil.convert(type='CURVE', use_timing_data=True)

needs the 3D view context to work, however if i set the correct context Blender crashes without any crash log

i have tried these two options

import bpy

area = bpy.context.area
old_type = area.type
area.type = 'VIEW_3D'

bpy.ops.gpencil.convert(type='CURVE', use_timing_data=True)

area.type = old_type


    import bpy

    win      = bpy.context.window
    scr      = win.screen
    areas3d  = [area for area in scr.areas if area.type == 'VIEW_3D']
    region   = [region for region in areas3d[0].regions if region.type == 'WINDOW']

    override = {'window':win,
                'area'  :areas3d[0],
                'scene' :bpy.context.scene,

bpy.ops.gpencil.convert(override, type='CURVE', use_timing_data=True)

How to explan the crashing and is there maybe a different approach for creating curve from grease pencil?


1 Answer 1


The custom context has an invalid region set, which results in the region data rv3d pointer being NULL in gp_camera_view_subrect() (gpencil_convert.c). In your custom context region is set to [bpy.data.screens['Scripting']...Region]. Instead of a list it should be a single bpy_struct. This can be fixed by modifying your override dictionary:

override = {'window': win,
            'screen': scr,
            'area'  : areas3d[0],
            'region': region[0],
            'scene' : bpy.context.scene} 

Alternatively you could copy the current context and modify the area and region.

import bpy

context = bpy.context.copy()

for area in bpy.context.screen.areas:
    if area.type == 'VIEW_3D':
        for region in area.regions:
            if region.type == 'WINDOW':
                context['area'] = area
                context['region'] = region

bpy.ops.gpencil.convert(context, type='CURVE', use_timing_data=True)

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .