Blender で IK/FK を一致させる

snap_ik_fk.py

// BEGIN MIT LICENSE BLOCK //
//
// Copyright (c) 2019 dskjal
// This software is released under the MIT License.
// http://opensource.org/licenses/mit-license.php
//
// END MIT LICENSE BLOCK   //
import bpy
from bpy.props import *
import mathutils

num_bones = 2
armature_name = 'Armature'
ik_target_name = 'T_IK'
pole_target_name = 'P_IK'
elbow_name = 'D_b1'
fk_tarminal_name = 'D_b2'
ik_tarminal_name = 'IK_b2'

class UI(bpy.types.Panel):
    bl_label = "Snap FK/IK"
    bl_space_type = "VIEW_3D"
    bl_region_type = "UI"
    
    @classmethod
    def poll(self, context):
        o = context.active_object
        return o and o.type == 'ARMATURE' and o.mode == 'POSE'
    
    def draw(self, context):
        self.layout.operator("my.fktoik")
        self.layout.operator("my.iktofk")
        
class FKtoIKButton(bpy.types.Operator):
    bl_idname = "my.fktoik"
    bl_label = "FK -> IK"
    bl_options = {'REGISTER', 'UNDO'}
  
    def execute(self, context):
        amt = bpy.data.objects[armature_name]
        ik_target = amt.pose.bones[ik_target_name]
        pole_target = amt.pose.bones[pole_target_name]
        elbowBone = amt.pose.bones[elbow_name]
        fk_tarminal = amt.pose.bones[fk_tarminal_name]
        ik_tarminal = amt.pose.bones[ik_tarminal_name]
        
        bones = []
        fk_it = fk_tarminal
        ik_it = ik_tarminal
        for i in range(num_bones):
            bones.append((fk_it,ik_it))
            fk_it = fk_it.parent
            ik_it = ik_it.parent
            
        for b in reversed(bones):
            b[0].matrix = b[1].matrix
            bpy.context.scene.update()
            
        return {'FINISHED'}
  
  
def set_translation(matrix, loc):
    trs = matrix.decompose()
    rot = trs[1].to_matrix().to_4x4()
    scale = mathutils.Matrix.Scale(1, 4, trs[2])
    return mathutils.Matrix.Translation(loc) * (rot * scale)
  
class IKtoFKButton(bpy.types.Operator):
    bl_idname = "my.iktofk"
    bl_label = "IK -> FK"
    bl_options = {'REGISTER', 'UNDO'}
  
    def execute(self, context):
        amt = bpy.data.objects[armature_name]
        ik_target = amt.pose.bones[ik_target_name]
        pole_target = amt.pose.bones[pole_target_name]
        elbowBone = amt.pose.bones[elbow_name]
        fk_tarminal = amt.pose.bones[fk_tarminal_name]
        ik_tarminal = amt.pose.bones[ik_tarminal_name]
        
        #move IK target to FK terminal
        ik_target.matrix = set_translation(ik_target.matrix, fk_tarminal.tail) 

        #move pole target to elbow
        pole_target.matrix = set_translation(pole_target.matrix, elbowBone.tail)

        return {'FINISHED'}
    
classes = (
    UI,
    FKtoIKButton,
    IKtoFKButton
)
def register():
    for cls in classes:
        bpy.utils.register_class(cls)
    
def unregister():
    for cls in reverse(classes):
        bpy.utils.unregister_class(cls)
    
if __name__ == "__main__":
    register()

Hi I stumbled with your blog and "stole" your FK/IK snapping code XD, but in your solution the hands won't snap with each other, I mean if my FK hand is 90 degrees to the left, when I snap the IK to it, the IK won't rotate 90 degrees to the left, I don't know anything about python so I can't solve it myself, but I'll be very thankful if you can do it. (Also I will REALLY want to invite you a coffee, your script was all I need to improve my rigging, don't you have any donation link or PayPal?) thanks again (sorry for posting this here, I know it has nothing to do with your video, but I couldn't find any other form of contact)

I have forgot to add a licence. This script can be used freely at your own risk.