.py

# BlenderユーザーのためのPython入門
# 第25節 ボーンを作成してボーンアニメーションさせる
import bpy
import math
import mathutils
class BoneAnimation():
    def __init__(self):
        """既存のアーマチュアとメッシュを削除します。"""
        for armature in bpy.data.armatures:
            assert isinstance(armature, bpy.types.Armature)
            bpy.data.armatures.remove(armature)
        for mesh in bpy.data.meshes:
            assert isinstance(mesh, bpy.types.Mesh)
            bpy.data.meshes.remove(mesh)
        for material in bpy.data.materials:
            assert isinstance(material, bpy.types.Material)
            bpy.data.materials.remove(material)
    def make_objects(self):
        """アーマチュアとメッシュを作ります。"""
        bpy.ops.object.add(type='ARMATURE')
        self.armature_object = bpy.context.active_object
        bpy.ops.mesh.primitive_cylinder_add(end_fill_type='TRIFAN')
        self.mesh_object = bpy.context.active_object
        bpy.context.view_layer.objects.active = self.armature_object
    def make_bones(self):
        """2つのボーンを配置します。"""
        bpy.ops.object.mode_set(mode='EDIT')
        armature = self.armature_object.data
        assert isinstance(armature, bpy.types.Armature)
        edit_bone = armature.edit_bones.new('Bone')
        assert isinstance(edit_bone, bpy.types.EditBone)
        edit_bone.head = (0, 0, -1)
        edit_bone.tail = (0, 0,  0)
        parent = edit_bone
        edit_bone = armature.edit_bones.new('Bone2')
        assert isinstance(edit_bone, bpy.types.EditBone)
        edit_bone.head = parent.tail
        edit_bone.tail = (0, 0, 1)
        edit_bone.parent = parent
        bpy.ops.object.mode_set(mode='OBJECT')
        bpy.context.view_layer.objects.active = self.mesh_object
        bpy.context.view_layer.objects.active = self.armature_object
        bpy.ops.object.parent_set(type='ARMATURE_AUTO')
    def make_animation(self):
        """ボーンアニメーションのキーフレームを設定します。"""
        object = self.armature_object
        pose = object.pose
        assert isinstance(pose, bpy.types.Pose)
        pose_bone = pose.bones['Bone2']
        assert isinstance(pose_bone, bpy.types.PoseBone)
        rotations = [(0, 0, 0), (90, 0, 0), (-90, 0, 0), (0, 90, 0), (0, -90, 0), (0, 0, 90), (0, 0, -90), (0, 0, 0)]
        pose_bone.rotation_mode = 'XYZ'
        for i, (x, y, z) in enumerate(rotations):
            euler = pose_bone.rotation_euler
            assert isinstance(euler, mathutils.Euler)
            euler.x = math.radians(x)
            euler.y = math.radians(y)
            euler.z = math.radians(z)
            pose_bone.keyframe_insert('rotation_euler', frame=35 * i)
    def make_material(self):
        """マテリアル等の設定をします。"""
        object = self.mesh_object
        bpy.context.view_layer.objects.active = object
        material = bpy.data.materials.new('MyMaterial')
        material.use_nodes = True
        node_tree = material.node_tree
        assert isinstance(node_tree, bpy.types.ShaderNodeTree)
        principled_bsdf = node_tree.nodes['Principled BSDF']
        assert isinstance(principled_bsdf, bpy.types.ShaderNodeBsdfPrincipled)
        principled_bsdf.inputs['Metallic' ].default_value = 1.0
        principled_bsdf.inputs['Roughness'].default_value = 0.0
        bpy.context.object.data.materials.append(material)
        # bpy.ops.object.shade_smooth()
if __name__ == '__main__':
    bone = BoneAnimation()
    bone.make_objects()
    bone.make_bones()
    bone.make_animation()
    bone.make_material()
    bpy.context.scene.frame_set(1)
    print('Done.')