boneanimation_to_blendshape.py

import bpy
import re

def get_shapekey(object_name, shape_name):
    bpy.context.view_layer.objects.active = bpy.data.objects[object_name]
    if bpy.context.object.data.shape_keys == None:
        return None
    for shape_key in bpy.context.object.data.shape_keys.key_blocks:
        if shape_key.name == shape_name:
            return shape_key

def reset_pose(root_object):
    bpy.context.view_layer.objects.active = root_object
    bpy.ops.object.posemode_toggle()
    bpy.ops.pose.select_all(action='SELECT')
    bpy.ops.pose.transforms_clear()
    bpy.ops.object.posemode_toggle()

root = bpy.context.active_object
face_obj = bpy.data.objects["Face"]

if not re.search(r'(Avatar|Player|Art|Rig)', root.name) or root.type != 'ARMATURE':
    raise BaseException("Avatar/Player/Art/*Rig Armature is not selected.")

use_bone_layer = False
bone_layer1_is_visible = False

if re.search(r'Rig', root.name):
    if bpy.app.version >= (4, 0, 0) and len(root.data.collections) > 0:
        use_bone_layer = True
        bone_layer1_is_visible = root.data.collections[0].is_visible
        root.data.collections[0].is_visible = True
    if bpy.app.version < (4, 0, 0) and len(root.data.layers) > 0:
        use_bone_layer = True
        bone_layer1_is_visible = root.data.layers[0]
        root.data.layers[0] = True

if face_obj is None:
    raise BaseException("Not found the Face object.")

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

# add basis shape
if get_shapekey("Face", "Basis") == None:
    bpy.context.view_layer.objects.active = bpy.data.objects["Face"]
    bpy.ops.object.shape_key_add(from_mix=False)

# convert animation to shapekey
for action in bpy.data.actions:
    if ".00" in action.name or "Emo_" not in action.name:
        continue

    print(action.name)    
    arr = action.name.split("_")
    shapekey_name = action.name

    # short blendshape name (uncomment if necessary)
    # shapekey_name = "_".join(arr[2:])

    # apply animation
    root.animation_data.action = action
    bpy.ops.object.visual_transform_apply()
    
    # convert shapekay
    bpy.context.view_layer.objects.active = face_obj
    bpy.ops.object.modifier_apply_as_shapekey(keep_modifier=True, modifier=face_obj.modifiers[0].name)
    shapekey = get_shapekey(face_obj.name, face_obj.modifiers[0].name)
    shapekey.name = shapekey_name

    # reset transform
    reset_pose(root)

# remove all actions (uncomment if necessary)
#for action in bpy.data.actions:
#    bpy.data.actions.remove(action)

if use_bone_layer:
    if bpy.app.version >= (4, 0, 0):
        root.data.collections[0].is_visible = bone_layer1_is_visible
    else:
        root.data.layers[0] = bone_layer1_is_visible

1. Embed facial expression clips into the model and export it as FBX: refs
2. Import FBX into Blender (disable automated bone orientation)
3. Execute this script

Note: Ensure that the facial expression clips correspond to the character's type

Example

• FuXuan -> Emo_Girl
• Seele -> Emo_Maid