three.js(18)-综合案例（地月绕行）

作者: 姜治宇 | 来源:发表于2021-12-06 17:58 被阅读0次

three.js(18)-综合案例（地月绕行）
18.综合案例2
Three.js自发光贴图 .emissiveMap
综合案例
three.js Demo案例
3/24day18_网络编程_ TCP
THREE.js_的使用(例子)
使用three.js的基本组件
Web前端开发程序员200行代码，月薪12K不解释
方法综合案例

今天我们来做一个综合案例，把前面的知识都串起来。

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="http://www.yanhuangxueyuan.com/versions/threejsR92/build/three.js"></script>
    <script src="http://www.yanhuangxueyuan.com/threejs/examples/js/controls/OrbitControls.js"></script>
    <script src="http://www.yanhuangxueyuan.com/threejs/examples/js/renderers/CSS2DRenderer.js"></script>
    <title>Document</title>
    <style>
        body {
            background: url(https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fpic1.win4000.com%2Fwallpaper%2F1%2F590c2682cc04c.jpg%3Fdown&refer=http%3A%2F%2Fpic1.win4000.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641349822&t=06301990af74d7bde9f5675864375620) no-repeat;
            background-size: cover;
        }

        .label {

            color: #ffffff;

            font-size: 16px;
        }
    </style>
</head>

<body>

</body>

</html>
<script>
    var scene, camera, renderer, labelRenderer;
    var earth, moon;
    let oldtime = 0;
    var clock = new THREE.Clock();

    const textureLoader = new THREE.TextureLoader();

    const EARCH_RADIUS = 2.6;
    const MOON_RADIUS = 0.3;


    init();
    ani();
    //初始化
    function init() {
        //场景初始化
        scene = new THREE.Scene();
        // var axes = new THREE.AxesHelper(50);//添加辅助坐标系
        // scene.add(axes);
        //光源初始化
        const light = new THREE.SpotLight(0xffffff);
        light.position.set(0, 0, 50);//沿着z轴打光

        scene.add(light);
        //物体初始化
        let earthUrl = 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fgss0.baidu.com%2F9fo3dSag_xI4khGko9WTAnF6hhy%2Fzhidao%2Fpic%2Fitem%2Fb2de9c82d158ccbf966e26f710d8bc3eb0354129.jpg&refer=http%3A%2F%2Fgss0.baidu.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641350661&t=5fedb443fdc2307ec5fcf6ae7d328883';
        let moonUrl = 'https://img2.baidu.com/it/u=4210058006,2612068669&fm=26&fmt=auto';
        earth = sphereGeomery(earthUrl, EARCH_RADIUS, 16, 16);
        moon = sphereGeomery(moonUrl, MOON_RADIUS, 16, 16);

        createLabel(earth, '地球', EARCH_RADIUS);
        createLabel(moon, '月亮', MOON_RADIUS);
        
        scene.add(earth);
        scene.add(moon);
        //相机初始化
        camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 500);
        camera.position.set(0, 0, 20);
        //渲染器初始化
        renderer = new THREE.WebGLRenderer({
            antialias: true,//消除锯齿
            alpha: true //透明
        });
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.setPixelRatio(window.devicePixelRatio);
        document.body.appendChild(renderer.domElement);

        labelRenderer = new THREE.CSS2DRenderer();
        labelRenderer.setSize(window.innerWidth, window.innerHeight);

        labelRenderer.domElement.style.position = 'absolute';
        labelRenderer.domElement.style.top = '0px';

        document.body.appendChild(labelRenderer.domElement);
        //增加鼠标拾取效果
        var controls = new THREE.OrbitControls(camera, renderer.domElement);

    }
    //创建物体
    function sphereGeomery(textureUrl, radius, widthSegments, heightSegments) {
        let geometry = new THREE.SphereGeometry(radius, widthSegments, heightSegments);
        let material = new THREE.MeshPhongMaterial({
            map: textureLoader.load(textureUrl)
        });
        let mesh = new THREE.Mesh(geometry, material);
        return mesh;

    }
    //创建标签
    function createLabel(mesh, text, radius) {
        const div = document.createElement('div');
        div.className = 'label';
        div.textContent = text;
        const label = new THREE.CSS2DObject(div);//声明html元素
        label.position.set(0, radius + 0.5, 0);
        mesh.add(label);
    }
    //动画
    function ani() {
        const elapsed = clock.getElapsedTime();
        moon.position.set(Math.sin(elapsed) * 5, 0, Math.cos(elapsed) * 5);//月球绕行
        var axis = new THREE.Vector3(0, 1, 0);//Y向量
        earth.rotateOnAxis(axis, (elapsed - oldtime) * Math.PI / 10);//地球沿着Y轴自转

        renderer.render(scene, camera);
        labelRenderer.render(scene, camera);

        oldtime = elapsed;

        requestAnimationFrame(ani);

    }

</script>

earth.gif

结合这个效果，咱们可以轻松做个炫酷的登录页出来：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="http://www.yanhuangxueyuan.com/versions/threejsR92/build/three.js"></script>
    <script src="http://www.yanhuangxueyuan.com/threejs/examples/js/controls/OrbitControls.js"></script>
    <script src="http://www.yanhuangxueyuan.com/threejs/examples/js/renderers/CSS2DRenderer.js"></script>
    <title>Document</title>
    <style>
        body {
            background: url(https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fpic1.win4000.com%2Fwallpaper%2F1%2F590c2682cc04c.jpg%3Fdown&refer=http%3A%2F%2Fpic1.win4000.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641349822&t=06301990af74d7bde9f5675864375620) no-repeat;
            background-size: cover;
            overflow: hidden;
        }

        .label {

            color: #ffffff;

            font-size: 16px;
        }
        input{
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            position: relative;
            display: inline-block;
            width: 100%;
            min-width: 0;
            padding: 4px 11px;
            color: rgba(255, 255, 255, 0.85);
            font-size: 14px;
            line-height: 1.5715;
            background-color: transparent;
            background-image: none;
            border: 1px solid #165996;
            border-radius: 2px;
            transition: all 0.3s;
        }
        .login{
            display:flex;
            position:absolute;
            top:50%;
            left:50%;
            width:600px;
            height:500px;
            margin-left:-300px;
            margin-top:-250px;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color:#fff;
            z-index:999;
            border:1px solid #ccc;
            border-radius: 8px;

            box-shadow: 2px  2px 3px #E5E5E5;

        }
        .row{
            display: flex;
            justify-content: center;
            align-items: center;
            margin:20px 0;
        }
        .sub{
            border: 0;
            width: 123px;
            height: 40px;
            background: linear-gradient(
        270deg, #40C4FF 0%, #2979FE 100%);
            border-radius: 20px;
            line-height: 21px;
            color: #FFFFFF;
            transition: all 0.1s ease;
            opacity: 1;
        }
    </style>
</head>

<body>

    <div class="login">
        <h1  class="row">用户登录</h1>
        <div class="row">
            用户名&nbsp;&nbsp;<input type="text"  style="width:300px;"/> 
        </div>
         <div class="row">
            密&nbsp;&nbsp;码&nbsp;&nbsp;<input type="text" style="width:300px;"/>
         </div>
         <div class="row">
             <button class="sub">登录</button>
         </div>
        
    </div>
</body>

</html>
<script>
    var scene, camera, renderer, labelRenderer;
    var earth, moon;
    let oldtime = 0;
    var clock = new THREE.Clock();

    const textureLoader = new THREE.TextureLoader();

    const EARCH_RADIUS = 2.6;
    const MOON_RADIUS = 0.3;


    init();
    ani();
    //初始化
    function init() {
        //场景初始化
        scene = new THREE.Scene();
        // var axes = new THREE.AxesHelper(50);//添加辅助坐标系
        // scene.add(axes);
        //光源初始化
        const light = new THREE.SpotLight(0xffffff);
        light.position.set(0, 0, 50);//沿着z轴打光

        scene.add(light);
        //物体初始化
        let earthUrl = 'https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fgss0.baidu.com%2F9fo3dSag_xI4khGko9WTAnF6hhy%2Fzhidao%2Fpic%2Fitem%2Fb2de9c82d158ccbf966e26f710d8bc3eb0354129.jpg&refer=http%3A%2F%2Fgss0.baidu.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641350661&t=5fedb443fdc2307ec5fcf6ae7d328883';
        let moonUrl = 'https://img2.baidu.com/it/u=4210058006,2612068669&fm=26&fmt=auto';
        earth = sphereGeomery(earthUrl, EARCH_RADIUS, 16, 16);
        moon = sphereGeomery(moonUrl, MOON_RADIUS, 16, 16);

        // createLabel(earth, '地球', EARCH_RADIUS);
        // createLabel(moon, '月亮', MOON_RADIUS);
        
        scene.add(earth);
        scene.add(moon);
        //相机初始化
        camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 500);
        camera.position.set(0, 0, 20);
        //渲染器初始化
        renderer = new THREE.WebGLRenderer({
            antialias: true,//消除锯齿
            alpha: true //透明
        });
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.setPixelRatio(window.devicePixelRatio);
        document.body.appendChild(renderer.domElement);

        labelRenderer = new THREE.CSS2DRenderer();
        labelRenderer.setSize(window.innerWidth, window.innerHeight);

        labelRenderer.domElement.style.position = 'absolute';
        labelRenderer.domElement.style.top = '0px';

        document.body.appendChild(labelRenderer.domElement);
        //增加鼠标拾取效果
        var controls = new THREE.OrbitControls(camera, renderer.domElement);

    }
    //创建物体
    function sphereGeomery(textureUrl, radius, widthSegments, heightSegments) {
        let geometry = new THREE.SphereGeometry(radius, widthSegments, heightSegments);
        let material = new THREE.MeshPhongMaterial({
            map: textureLoader.load(textureUrl)
        });
        let mesh = new THREE.Mesh(geometry, material);
        return mesh;

    }
    //创建标签
    function createLabel(mesh, text, radius) {
        const div = document.createElement('div');
        div.className = 'label';
        div.textContent = text;
        const label = new THREE.CSS2DObject(div);//声明html元素
        label.position.set(0, radius + 0.5, 0);
        mesh.add(label);
    }
    //动画
    function ani() {
        const elapsed = clock.getElapsedTime();
        moon.position.set(Math.sin(elapsed) * 5, 0, Math.cos(elapsed) * 5);//月球绕行
        var axis = new THREE.Vector3(0, 1, 0);//Y向量
        earth.rotateOnAxis(axis, (elapsed - oldtime) * Math.PI / 10);//地球沿着Y轴自转

        renderer.render(scene, camera);
        labelRenderer.render(scene, camera);

        oldtime = elapsed;

        requestAnimationFrame(ani);

    }
    window.onresize =  function(){
        camera.aspect = window.innerWidth /window.innerHeight;
        camera.updateProjectionMatrix();
        renderer.setSize(window.innerWidth, window.innerHeight);
    }
</script>

three.js(18)-综合案例（地月绕行）
今天我们来做一个综合案例，把前面的知识都串起来。结合这个效果，咱们可以轻松做个炫酷的登录页出来：
18.综合案例2
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