How can I copy the location and rotation of multiple bones of a skeleton and paste them to an identical skeleton?

Question

I need to change all the bone's location and rotation on the right skeleton to match with the left skeleton, but I'm hoping there's a better way than manually fixing each bone here. Thanks!

Answer 1

first select object which you want to be clone and then select the reference object and use the script below:

import bpy

ref_ob = bpy.context.object
other_ob = [ob for ob in bpy.data.objects if ob.select_get()]
other_ob.remove(ref_ob)
other_ob = other_ob[0]

bpy.context.view_layer.objects.active = other_ob

bpy.ops.object.mode_set(mode='OBJECT')
for bone in ref_ob.pose.bones:
    if bone.name in other_ob.pose.bones:
        bpy.ops.object.mode_set(mode='POSE')
        other_ob.pose.bones[bone.name].matrix = bone.matrix
        bpy.ops.object.mode_set(mode='OBJECT')

Rotation-only snippet:

in order to copy just rotations, use this code:

import bpy

ref_ob = bpy.context.object
other_ob = [ob for ob in bpy.data.objects if ob.select_get()]
other_ob.remove(ref_ob)
other_ob = other_ob[0]

bpy.context.view_layer.objects.active = other_ob

#store parents and delink
parent_store = dict()
bone_names = [bone.name for bone in other_ob.pose.bones] 
for bn in bone_names:
    parent = other_ob.pose.bones[bn].parent
    parent_val = '' if parent is None else parent.name
    parent_store[bn] = parent_val
    bpy.ops.object.mode_set(mode = 'EDIT')
    other_ob.data.edit_bones[bn].parent = None
    bpy.ops.object.mode_set(mode='POSE')

#copy desired transforms
bpy.ops.object.mode_set(mode='OBJECT')

for bone in ref_ob.pose.bones:
    if bone.name in other_ob.pose.bones:
        bpy.ops.object.mode_set(mode='POSE')
        _mat = other_ob.pose.bones[bone.name].matrix.copy()
        _pos   = _mat.to_translation()
        _scale = _mat.to_scale()
        _rot   = bone.matrix.to_quaternion()
        T = _mat.Translation(_pos)
        R = _rot.to_matrix().to_4x4()
        S = _mat.Diagonal(_scale.to_4d())
        other_ob.pose.bones[bone.name].matrix = T @ R @ S
        bpy.ops.object.mode_set(mode='OBJECT')

bpy.ops.object.mode_set(mode='POSE')
bpy.ops.pose.armature_apply(selected=False)

#restore parents
bpy.ops.object.mode_set(mode = 'EDIT')

for bone in other_ob.pose.bones:
    _name = bone.name
    par_name = parent_store[bone.name]
    _parent = None if par_name == '' else other_ob.data.edit_bones[par_name]
    other_ob.data.edit_bones[_name].parent = _parent

bpy.ops.object.mode_set(mode='OBJECT')