ソフトボディ等の頂点の動きをボーンアニメーション化するやつ

softbody_to_boneanimation.py

import bpy
context = bpy.context

base_ob = bpy.data.objects['Suzanne1'] # ソフトボディを設定したメッシュ
target_ob = bpy.data.objects['Suzanne2'] # base_obをリンク複製してモディファイアはすべて消したもの

target_ob.vertex_groups.clear()
vg_names = []
num_vertices = len(target_ob.data.vertices)
for i, v in enumerate(target_ob.data.vertices):
    name = "v-"+str(i).zfill(len(str(num_vertices)))
    #print(name)
    vg_names.append(name)
    group = target_ob.vertex_groups.new(name=name)
    group.add([i], 1.0, 'REPLACE')

#print(vg_names)

mw = target_ob.matrix_world.copy()

depsgraph = context.evaluated_depsgraph_get()
target_ob_eval = target_ob.evaluated_get(depsgraph)
target_mesh_eval = target_ob_eval.data
vertices = [target_ob_eval.matrix_world @ v.co for v in target_mesh_eval.vertices]

#print(vertices)

bpy.ops.object.armature_add()
context.active_object.matrix_world = mw  # ???
context.active_object.data.display_type = 'STICK'

bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.armature.select_all(action='SELECT')
bpy.ops.armature.delete()

for name, v in zip(vg_names, vertices):
    context.scene.cursor.location = v
    bpy.ops.armature.bone_primitive_add(name=name)

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

for i in range(context.scene.frame_start, context.scene.frame_end+1):
    context.scene.frame_current = i
    print(i)
    depsgraph = context.evaluated_depsgraph_get()
    base_ob_eval = base_ob.evaluated_get(depsgraph)
    base_mesh_eval = base_ob_eval.data
    vertices = [base_ob_eval.matrix_world @ v.co for v in base_mesh_eval.vertices]

    for name, v in zip(vg_names, vertices):
        ob = context.object
        pb = ob.pose.bones[name]
        mw = ob.convert_space(
            pose_bone=pb,
            matrix=pb.matrix,
            from_space='POSE',
            to_space='WORLD')
        mw.translation = v
        pb.matrix = ob.convert_space(
            pose_bone=pb,
            matrix=mw,
            from_space='WORLD',
            to_space='POSE')
        pb.keyframe_insert('location')

bpy.ops.object.mode_set(mode='OBJECT')
mod = target_ob.modifiers.new('', 'ARMATURE')
mod.object = context.object