为什么我的这串代码实现不了书中3.3把零件拼成整体有两只手的效果

#1

网址：https://www.code3dgames.com/3de/#B/pVRRb9owEH7vrzjxUm/KAn1AmzpaqWIRVKLpBEjdq4kP7CmxkW2I2mr/fbaTeIR2e1kISuS7777vuzuYbBR7vp0Mw+NiYgot9haMLm4GQ8s1YvrTDFy8CcSM2wuA4RDWHGFgCpQ4AGGg5qgRjD1styAkqIOGHa0QalGWwOl+j/LaAY9UQwDBDUisYT1fZlm68ifkw9c2YVtS6+Kv/rnilAm5uwarD/iryyjFjtteibtqI1DahQ+Qy5oLi5cJjNIvoWqgTCljJCDd2YmJwunUtHXhmA2iActbN51qavZY2CW1QjniWkim6lRIifpJMMth2Dubo+fp5DYMPb3fUYeC4ojTECWfx8kpSQJX7h65KzhoSqR7ZYQLyvTFVRuPRn1zTVLfnUbJ3Gj0AJimdWvRu2tFBbdKWtVYLtzc46Q6bE/5E25mi2UbIa9UWkFLQU07oqC2A6YG7Uq8IHnTr+SddgUoU8WhcpNM/VqmYXHYlIuSkViUqSor0SdFqx/bC1bru+Uapo/f7vMZPOZOcwZ59mMNi/s8i2mtP0/RX8S9X+MZqgqtfiau/Un7jctZqONZQx7Q8FzpipYP1KJ23SB+cyOCHqmlbyHEsyeh3NmONoCI51Syf6kcN+K6mflOzs8hgdAXOiGMmX+2yo2LfLoajxL3ORMVs0/JStz+F9f7VF3VjsnNN1d1Aoar+m/7e7a9cVeaFxKKJxB/IPFf7Tc=

#2

只有一个简单的错字.

更改此代码:

  var leftHand = new THREE.Mesh(hand,cover);
  rightHand.position.set(150,0,0);
  scene.add(leftHand);

将代码更改为以下内容:

  var leftHand = new THREE.Mesh(hand,cover);
  leftHand.position.set(150,0,0);
  scene.add(leftHand);