How to use the rotate operator on Blender Python if you execute the script on the background?

Question

I am importing a model that consists of multiple individual meshes. Right after import (where everything is selected), I want to rotate the imported selected objects based on a [X, Y, Z] angle parameter. Also I want to run the script as a blender "--background" shell process.

I tried doing something like this but it doesn't seem to work.

bpy.ops.transform.rotate(value=math.radians(param.x), orient_axis='X'); bpy.ops.transform.rotate(value=math.radians(param.y), orient_axis='Y'); bpy.ops.transform.rotate(value=math.radians(param.z), orient_axis='Z');

I get this error:

RuntimeError: Operator bpy.ops.transform.rotate.poll() failed, context is incorrect

I tried searching the internet for solutions but I couldn't understand exactly what is going wrong. Also I think this error doesn't appear because I am running with "--background", but because I am running it as a terminal command.

Thanks in advance! I am using Blender 2.9.

osk386 · Accepted Answer · 2021-05-29 05:03:09Z

9

Im running the same issue. I have some scripts that worked so fine in blender 2.83 as module using bpy.ops.transformm.rotate, now this is not working on the new bpy (blender as module) version 2.93.

I realized that bpy.ops.transform.rotate.poll() return false using the module, from python script, while the function bpy.ops.transform.translate.poll() returns true.

However when I run the same function in the scripting console of the blender 2.93 GUI, the function bpy.ops.transform.rotate.poll() returns true.

So I think is a bug in the new version.

However I was able to fix this passing a VIEW_3D context as first argument in the operator:

>>> ov=bpy.context.copy()
>>> ov['area']=[a for a in bpy.context.screen.areas if a.type=="VIEW_3D"][0]
>>> bpy.ops.transform.rotate(ov)
{'FINISHED'}

In your case:

# ... already selected objects, ov is for override, I'm lazy.
>>> ov=bpy.context.copy()
>>> ov['area']=[a for a in bpy.context.screen.areas if a.type=="VIEW_3D"][0]
>>> bpy.ops.transform.rotate(ov, value=math.radians(param.x), orient_axis='X')
{'FINISHED'}

edited May 29, 2021 at 5:03

answered May 26, 2021 at 1:14

osk386

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5 Comments

zackper Over a year ago

Man you are great! Helped me a lot, thank you! Have a nice day!

kalmiya Over a year ago

Ran into the exact same issue. For the record the script was working with Blender 2.90 and stopped working in Blender 2.93 (and also 2.92 - didn't try 2.91).

wr200m Over a year ago

I can confirm in 2.91 the original worked. Mine also stopped in 2.93 ( didn't try 2.92). The fix is awesome! I wonder how you figured it out!

wr200m Over a year ago

Also, when you said it was a bug, is this what blender.org intended, or is something require a fix from them, and is it already fixed in 3.x? I haven't found a bug report on their site. I haven't tried anything in Blender 3.x - which I will attempt that on my current python workflow after the summer.

ofekp Over a year ago

In case you got the deprecation warning: area = [a for a in bpy.context.screen.areas if a.type=="VIEW_3D"][0] then put your code inside with bpy.context.temp_override(area=area):

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