12-THREE.JS 自然光

<!DOCTYPE html>

<html>

<head>
    <title></title>
    <script src="https://cdn.bootcss.com/three.js/r67/three.js"></script>
    <script src="https://cdn.bootcss.com/stats.js/r10/Stats.min.js"></script>
    <script type="text/javascript" src="https://cdn.bootcss.com/dat-gui/0.7.3/dat.gui.js"></script>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>
<body>

<div id="Stats-output">
</div>
<div id="WebGL-output">
</div>
<script type="text/javascript">

    // 初始化
    function init() {

        var stats = initStats();

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

        // 创建一个相机
        var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);

        // 创建渲染器
        var renderer = new THREE.WebGLRenderer();

        renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0));
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.shadowMapEnabled = true;

        // 创建一个地面
        var planeGeometry = new THREE.PlaneGeometry(60, 20, 1, 1);
        var planeMaterial = new THREE.MeshLambertMaterial({color: 0xffffff});
        var plane = new THREE.Mesh(planeGeometry, planeMaterial);
        plane.receiveShadow = true;

        // 旋转地面
        plane.rotation.x = -0.5 * Math.PI;
        plane.position.x = 15;
        plane.position.y = 0;
        plane.position.z = 0;

        // 添加地面
        scene.add(plane);

        // 创建一个正方体
        var cubeGeometry = new THREE.BoxGeometry(4, 4, 4);
        var cubeMaterial = new THREE.MeshLambertMaterial({color: 0xff0000});
        var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
        cube.castShadow = true;

        // 给正方体坐标
        cube.position.x = -4;
        cube.position.y = 3;
        cube.position.z = 0;

        // 把正方体添加到场景中去
        scene.add(cube);

        // 创建一个球体
        var sphereGeometry = new THREE.SphereGeometry(4, 20, 20);
        var sphereMaterial = new THREE.MeshLambertMaterial({color: 0x7777ff});
        var sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);

        // 给球体坐标
        sphere.position.x = 20;
        sphere.position.y = 0;
        sphere.position.z = 2;
        sphere.castShadow = true;

        // 把球体添加到场景中去
        scene.add(sphere);

        // 照相机朝向 10,0,0 的方向
        camera.position.x = -25;
        camera.position.y = 30;
        camera.position.z = 25;
        camera.lookAt(new THREE.Vector3(10, 0, 0));

        // 添加自然光
        var ambiColor = "#0c0c0c";
        var ambientLight = new THREE.AmbientLight(ambiColor);
        scene.add(ambientLight);

        // 添加聚光灯
        var spotLight = new THREE.SpotLight(0xffffff);
        spotLight.position.set(-40, 60, -10);
        spotLight.castShadow = true;
        scene.add(spotLight);

        // 把渲染之后的元素放到DOM元素中去
        document.getElementById("WebGL-output").appendChild(renderer.domElement);

        var step = 0;

        var controls = new function () {
            this.rotationSpeed = 0.02;
            this.bouncingSpeed = 0.03;
            this.ambientColor = ambiColor;
            this.disableSpotlight = false;
        };

        var gui = new dat.GUI();
        gui.addColor(controls, 'ambientColor').onChange(function (e) {
            ambientLight.color = new THREE.Color(e);
        });
        gui.add(controls, 'disableSpotlight').onChange(function (e) {
            spotLight.visible = !e;
        });

        render();

        function render() {
            stats.update();
            // 旋转正方体
            cube.rotation.x += controls.rotationSpeed;
            cube.rotation.y += controls.rotationSpeed;
            cube.rotation.z += controls.rotationSpeed;

            // 滚动球体
            step += controls.bouncingSpeed;
            sphere.position.x = 20 + ( 10 * (Math.cos(step)));
            sphere.position.y = 2 + ( 10 * Math.abs(Math.sin(step)));

            requestAnimationFrame(render);
            renderer.render(scene, camera);
        }

        function initStats() {

            var stats = new Stats();

            stats.setMode(0); // 0: fps, 1: ms
            stats.domElement.style.position = 'absolute';
            stats.domElement.style.left = '0px';
            stats.domElement.style.top = '0px';

            document.getElementById("Stats-output").appendChild(stats.domElement);

            return stats;
        }
    }

    window.onload = init

</script>
</body>
</html>