from ursina import *
from ursina.prefabs.first_person_controller import FirstPersonController

app = Ursina()

player = FirstPersonController()

sky = Entity(
    parent=scene,
    model='sphere',
    texture=load_texture('../Assets/Cube/MoreCube/sky.jpg'),
    scale=2000,
    double_sided=True
)


class Voxel(Button):
    def __init__(self, position=(0, 0, 0), texture='../Assets/Minecraft/Block/stone/stone.png'):
        super().__init__(
            parent=scene,
            position=position,
            model='cube',
            origin_y=0.5,
            texture=texture,
            color=color.color(0, 0, random.uniform(0.9, 1.0)),
            scale=1.0
        )

    def input(self, key):
        if self.hovered:
            if key == 'right mouse down':
                Voxel(position=self.position + mouse.normal, texture='../Assets/Minecraft/Block/stone/stone.png')
            elif key == 'left mouse down':
                destroy(self)


for x in range(20):
    for z in range(20):
        voxel = Voxel(position=(x, 0, z))

app.run()

로 된 코드가

강좌에서는 잘 작동합니다만 실제 상황에서는 작도 안하더라고요

어떻게 해야하나요?