How to move an object's origin to the center of its bounding box?

Question

What I want:
I want to set the origin of an object to the center of its bounding box using a python command.

What I've tried:

bpy.ops.object.origin_set(type='ORIGIN_CENTER_OF_MASS')

and

bpy.ops.object.origin_set(type='ORIGIN_GEOMETRY')

What happened:

As you can see, the origin isn't centered to the bounding box.

EDIT: I asked the same question as Get center of geometry of an object with the addition of setting the origin to this center.

The origin moved to the center of mass. It is now centered, where do you suppose the center is suposed to be. Do you mean the center of the bounding box? — Leander, Dec 29 '16 at 20:11
From Get centre of geometry, the local centre is (0, 0, 0) to move the origin, subtract (transform) the new local location vector from the vert coordinate locations. — batFINGER, Dec 30 '16 at 13:27

score 14 · Accepted Answer · edited Apr 22 '20 at 13:02

14

Have you tried setting the center to BOUNDS?

bpy.ops.object.origin_set(type='ORIGIN_GEOMETRY', center='BOUNDS')

edited Apr 22 '20 at 13:02

brockmann

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answered Dec 30 '16 at 01:38

gandalf3

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1

It works on its own. But when I add it to my script, it doesn't work for some reason. https://drive.google.com/file/d/1O_G_REJSVIRMu6ndof6ivK6QdJNtzxDk/view?usp=sharing – June Wang Sep 24 '20 at 11:37

score 0 · Answer 2 · answered Aug 09 '18 at 08:34

I noted that this can be further confusing if you have a group with joined geometry inside it.

objGrp = bpy.data.objects.new(scn.baseName, None)

if objGrp has children that have there own origin set wrong sleecting it in the view will still have the origin wrong while the group parent object might be fine. In this case you simply need to make sure you've selected the internal object first and the same will apply.

So Center of Mass etc. will work as expected on the kid too. Here we see this situation where a bunch of generated objects are joined and then have the center set. Still maybe you want to loose the parent object at that point but it's just an example of how the Question poster (or others with this variation) might have not see the desired effect.

obs = objGrp.children
ctx = bpy.context.copy()

ctx['active_object'] = obs[0]
ctx['selected_objects'] = obs
ctx['selected_editable_bases'] = [scn.object_bases[ob.name] for ob in obs]

ob = bpy.ops.object
ob.join(ctx)
obs[0].select = True
ob.origin_set(type='ORIGIN_CENTER_OF_MASS')

How to move an object's origin to the center of its bounding box?

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