<!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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