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three-js-demo
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three.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      body {
        margin: 0;
        overflow: hidden;
      }
    </style>
  </head>
  <body>
    <div id="myState"></div>
  </body>
  <script src="./three.js"></script>
  <script src="./OrbitControls.js"></script>
  <script type="module">
    import Stats from "./Stats.js";
    /**
     * 创建场景对象Scene
     */
    var scene = new THREE.Scene();
    var stats = addStats();
    /**
     * 创建网格模型
     */
    // var geometry = new THREE.SphereGeometry(60, 40, 40); //创建一个球体几何对象
    var geometry = new THREE.BoxGeometry(100, 100, 100); //创建一个立方体几何对象Geometry
    var material = new THREE.MeshLambertMaterial({
      color: 0x0000ff,
    }); //材质对象Material
    var mesh = new THREE.Mesh(geometry, material); //网格模型对象Mesh
    scene.add(mesh); //网格模型添加到场景中
    /**
     * 光源设置
     */
    //点光源
    var point = new THREE.PointLight(0xffffff);
    point.position.set(400, 200, 300); //点光源位置
    scene.add(point); //点光源添加到场景中
    //环境光
    var ambient = new THREE.AmbientLight(0x444444);
    scene.add(ambient);
    // console.log(scene)
    // console.log(scene.children)
    var AxisHelper = new THREE.AxisHelper(300);
    scene.add(AxisHelper);

    /**
     * 相机设置
     */
    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
    var s = 200; //三维场景显示范围控制系数，系数越大，显示的范围越大
    //创建相机对象
    var camera = new THREE.OrthographicCamera(-s * k, s * k, s, -s, 1, 1000);
    camera.position.set(200, 300, 200); //设置相机位置
    camera.lookAt(scene.position); //设置相机方向(指向的场景对象)
    /**
     * 创建渲染器对象
     */
    var renderer = new THREE.WebGLRenderer();
    renderer.setSize(width, height); //设置渲染区域尺寸
    renderer.setClearColor(0xb9d3ff, 1); //设置背景颜色
    document.body.appendChild(renderer.domElement); //body元素中插入canvas对象
    //执行渲染操作   指定场景、相机作为参数
    //执行渲染操作
    var gap = 0;
    function render() {
      stats.update();
      renderer.render(scene, camera);
      mesh.rotateX(0.005);
      mesh.rotateY(0.005);
      mesh.rotateZ(0.005);
      requestAnimationFrame(render);
    }
    render();
    var controls = new THREE.OrbitControls(camera, renderer.domElement); //创建控件对象
    controls.addEventListener("change", () => {
      renderer.render(scene, camera);
    }); //监听鼠标、键盘事件
    function addStats() {
      var stats = new Stats();
      console.log(stats);
      stats.domElement.style.position = "absolute";
      stats.domElement.style.left = 0;
      stats.domElement.style.top = 0;
      stats.setMode(0);
      document.getElementById("myState").appendChild(stats.domElement);
      return stats;
    }
  </script>
</html>