Apply copy transform constraint using script

Question

I'll try writing this the best I can. I want to be able to apply a copy transform on Rig 1 so it can be controlled by Rig 2. Both rig has the same bone names etc. Instead of manually going to each bone and apply a copy transform constraint. I would like to be able to run a script or something where it does it automatically. Is this possible at all? I will do my best to help answer any questions or provide blend file if needed.

https://drive.google.com/file/d/1yAbTtWaeXYSN9i9qeyneAJo-C12S3cX3/view?usp=sharing

Answer 1

This code is an example of how to do that, but I've left out three settings because I didn't know if the default was enough

import bpy

src = bpy.data.objects['src']
dst = bpy.data.objects['dst']

for bone in dst.pose.bones:
    bone.constraints.new('COPY_TRANSFORMS')
    constraint = bone.constraints[-1]
    constraint.target = src
    constraint.subtarget = bone.name

You need to change the first two statements after the import to whatever code you need to select the two armatures. I tested with two armatures that had obvious names.

I didn't set the Mix, Target Space, Owner Space, or influence, assuming the defaults were what you wanted. They are the following fields mix_mode, target_space, owner_space, and influence.

mix mode can take any value in this list: 'REPLACE', 'BEFORE_FULL', 'BEFORE', 'BEFORE_SPLIT', 'AFTER_FULL', 'AFTER', 'AFTER_SPLIT'.

The spaces can take any value in this list: 'WORLD', 'CUSTOM', 'POSE', 'LOCAL_WITH_PARENT', 'LOCAL', 'LOCAL_OWNER_ORIENT'

Influence is a floating point number in the range of 0.0 to 1.0

You can find out more about the meaning of the values in the Copy Transforms Constraint manual page.