13-THREE.JS 点光源

<!DOCTYPE html>

<html>

<head>

    <title>Example 03.02 - point Light</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);

        // 创建一个渲染器

        var renderer = new THREE.WebGLRenderer();

        renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0));

        renderer.setSize(window.innerWidth, window.innerHeight);

        // renderer.shadowMapEnabled = true;

        // 创建地面

        var planeGeometry = new THREE.PlaneGeometry(60, 20, 20, 20);

        var planeMaterial = new THREE.MeshPhongMaterial({color: 0xffffff});

        var plane = new THREE.Mesh(planeGeometry, planeMaterial);

        plane.receiveShadow = true;

        // 让地面保持水平

        plane.rotation.x = -0.5 * Math.PI;

        plane.position.x = 15;

        plane.position.y = 0;

        plane.position.z = 0;

        // 把地面添加到场景中去

        scene.add(plane);

        // 创建一个正方体

        var cubeGeometry = new THREE.BoxGeometry(4, 4, 4);

        var cubeMaterial = new THREE.MeshLambertMaterial({color: 0xff7777});

        var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);

        cube.castShadow = true;

        // 设置正方体的坐标

        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);

        var sphereGeometry = new THREE.SphereGeometry(4, 20, 20);

        var sphereMaterial = new THREE.MeshLambertMaterial({color: 0x7777ff});

        var sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);

        // 给球坐标

        sphere.position.x = 20;

        sphere.position.y = 0;

        sphere.position.z = 2;

        sphere.castShadow = true;

        // 把球添加到场景中去

        scene.add(sphere);

        // 调整相机的位置和朝向

        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 );

        //添加点光源

        var pointColor = "#ccffcc";

        var pointLight = new THREE.PointLight(pointColor);

        pointLight.distance = 100;  //点光源距离

        scene.add(pointLight);

        // 添加一个小的圆形在点光源的光源头部

        var sphereLight = new THREE.SphereGeometry(0.2);

        var sphereLightMaterial = new THREE.MeshBasicMaterial({color: 0xac6c25});

        var sphereLightMesh = new THREE.Mesh(sphereLight, sphereLightMaterial);

        sphereLightMesh.castShadow = true;

        sphereLightMesh.position = new THREE.Vector3(3, 0, 3);

        scene.add(sphereLightMesh);

        // 渲染效果放到DOM元素中去

        document.getElementById("WebGL-output").appendChild(renderer.domElement);

        var step = 0;

        var invert = 1;

        var phase = 0;

        var controls = new function () {

            this.rotationSpeed = 0.03;

            this.bouncingSpeed = 0.03;

            this.ambientColor = ambiColor;

            this.pointColor = pointColor;

            this.intensity = 1;

            this.distance = 100;

        };

        var gui = new dat.GUI();

        gui.addColor(controls, 'ambientColor').onChange(function (e) {

            ambientLight.color = new THREE.Color(e);

        });

        gui.addColor(controls, 'pointColor').onChange(function (e) {

            pointLight.color = new THREE.Color(e);

        });

        gui.add(controls, 'intensity', 0, 3).onChange(function (e) {

            pointLight.intensity = e;

        });

        gui.add(controls, 'distance', 0, 100).onChange(function (e) {

            pointLight.distance = 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;

            // 使球体运动

            step += controls.bouncingSpeed;

            sphere.position.x = 20 + ( 10 * (Math.cos(step)));

            sphere.position.y = 2 + ( 10 * Math.abs(Math.sin(step)));

            if (phase > 2 * Math.PI) {

                invert = invert * -1;

                phase -= 2 * Math.PI;

            } else {

                phase += controls.rotationSpeed;

            }

            sphereLightMesh.position.z = +(7 * (Math.sin(phase)));

            sphereLightMesh.position.x = +(14 * (Math.cos(phase)));

            sphereLightMesh.position.y = 5;

            if (invert < 0) {

                var pivot = 14;

                sphereLightMesh.position.x = (invert * (sphereLightMesh.position.x - pivot)) + pivot;

            }

            pointLight.position.copy(sphereLightMesh.position);

            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>

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