Three.js -之前的行在克隆后变得不可见

// 创建一个场景、相机和渲染器
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// 创建一个几何体和材质
const geometry = new THREE.BoxGeometry();
const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });

// 创建一个网格对象
const mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);

// 克隆网格对象
const clonedMesh = mesh.clone();
clonedMesh.position.x = 2; // 设置克隆对象的位置
scene.add(clonedMesh);

// 设置相机位置
camera.position.z = 5;

// 渲染循环
function animate() {
    requestAnimationFrame(animate);
    renderer.render(scene, camera);
}
animate();