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              <script src="https://unpkg.com/three"></script>
            
          
!
            
              * {
  margin: 0;
  padding: 0;
}

body {
  overflow: hidden;
}
            
          
!
            
              function init () {
    // 获取浏览器窗口的宽高,后续会用
    var width = window.innerWidth
    var height = window.innerHeight

    // 创建一个场景
    var scene = new THREE.Scene()

    // 创建一个具有透视效果的摄像头
    var camera = new THREE.PerspectiveCamera(45, width / height, 0.1, 800)

    // 创建一个 WebGL 渲染器,Three.js 还提供 <canvas>, <svg>, CSS3D 渲染器。
    var renderer = new THREE.WebGLRenderer()

    // 设置渲染器的清除颜色(即背景色)和尺寸
    renderer.setClearColor(0xffffff)
    renderer.setSize(width, height)

    // 创建一个长宽高均为 4 个单位长度的立方体(几何体)
    var cubeGeometry = new THREE.BoxGeometry(8, 8, 8)

    // 创建材质
    var cubeMaterial = new THREE.MeshBasicMaterial({
        color: 0xff0000,
        wireframe: true
    })

    // 创建一个立方体网格(mesh):将材质包裹在几何体上
    var cube = new THREE.Mesh(cubeGeometry, cubeMaterial)

    // 设置立方体网格位置
    // 设置位置的的方式有三种:
    // ①直接设置坐标 cube.position.x = 10 cube.position.y = 3 cube.position.z = 1
    // ②一次性设置 cube.position.set(10, 3, 1)
    // ③ position 属性是一个 THREE.Vector3 对象 cube.position = new THREE.Vector3(10, 3, 1)
    cube.position.x = 0
    cube.position.y = -2
    cube.position.z = 0

    // 将立方体网格加入到场景中
    scene.add(cube)

    // 设置摄像机位置,并将其朝向场景中心(0, 0, 0)
    camera.position.x = 10
    camera.position.y = 10
    camera.position.z = 30
    camera.lookAt(scene.position)

    // 将渲染器的输出(此处是 canvas 元素)插入到 body
    document.body.appendChild(renderer.domElement)

    // 渲染,即摄像头拍下此刻的场景
    renderer.render(scene, camera)
}
init()
            
          
!
999px
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