console 命令行工具 X clear

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// 1.创建场景 
const scene = new THREE.Scene();

// 2.创建相机
var width = window.innerWidth; //窗口宽度
var height = window.innerHeight; //窗口高度
var k = width / height; //窗口宽高比
const camera = new THREE.PerspectiveCamera(90, k, 1, 1000);
camera.position.set(0, 0, -300); //设置相机位置
camera.lookAt(0, 0, 0);
scene.add(camera);

// 3. 创建渲染器
const renderer = new THREE.WebGLRenderer();
renderer.setSize(width, height);
document.body.appendChild(renderer.domElement);
renderer.setClearColor(0x000000);

// 4. 创建物体
const geometry = new THREE.BoxGeometry(100, 100, 100); // 几何体
const material1 = new THREE.MeshBasicMaterial({ color: 0xb01ff0 }); // 材质
var cube1 = new THREE.Mesh(geometry, material1);
cube1.position.set(-100, 0, 0);
scene.add(cube1);// 注意要把创建好的物体添加到场景中

const material2 = new THREE.MeshBasicMaterial({ color: 0xffaa00 }); // 材质
var cube2 = new THREE.Mesh(geometry, material2);
cube2.position.set(100, 0, 0);
scene.add(cube2);// 注意要把创建好的物体添加到场景中
// 5. 鼠标交互
const controls = new THREE.OrbitControls(camera, renderer.domElement);

// 控制
const gui = new dat.GUI();
let objs = ['场景中心', '橙色盒子', '紫色盒子'];
let settings = {
    '观察对象': objs[0]
}
var cGui = gui.addFolder('控制操作');
cGui.open();
cGui.add(settings, '观察对象').options(objs).onChange((val) => {
    if (val == '紫色盒子') {
        camera.lookAt(cube1.position)
    } else if (val == '橙色盒子') {
        camera.lookAt(cube2.position)
    } else {
        camera.lookAt(0, 0, 0)
    }
});
// 6. 渲染 
function render() {
    requestAnimationFrame(render);
    renderer.render(scene, camera);
}
render()

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body style="margin:0;">
</body>
</html>

SOURCE

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