为什么在three.js示例中将25加到立方体位置？

// 引入three.js库
import * as THREE from 'three';

// 创建场景
const scene = new THREE.Scene();

// 创建相机
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.z = 50;

// 创建渲染器
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

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

// 创建立方体并设置位置
const cube = new THREE.Mesh(geometry, material);
cube.position.set(25, 0, 0); // 将立方体移动到(25, 0, 0)

// 将立方体添加到场景中
scene.add(cube);

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