1.搭建HTML框架
<!DOCTYPE html>
<html>
<head>
<title>Example 01.06 - Screen size change</title>
<meta charset="UTF-8" />
<script type="text/javascript" charset="UTF-8" src="../../libs/three/three.js"></script>
<script type="text/javascript" charset="UTF-8" src="../../libs/three/controls/TrackballControls.js"></script>
<script type="text/javascript" src="../../libs/util/Stats.js"></script>
<script type="text/javascript" src="../../libs/util/dat.gui.js"></script>
<script type="text/javascript" src="../js/util.js"></script>
<script type="text/javascript" src="./js/01-06.js"></script>
<link rel="stylesheet" href="../../css/default.css">
</head>
<body>
<div id="webgl-output"></div>
<!-- Javascript code that runs our Three.js examples -->
<script type="text/javascript">
(function () {
// your page initialization code here
// the DOM will be available here
init()
})();
</script>
</body>
</html>
2.渲染并查看对象
function init() {
// listen to the resize events
window.addEventListener('resize', onResize, false);
var camera;
var scene;
var renderer;
// initialize stats
var stats = initStats();
// create a scene, that will hold all our elements such as objects, cameras and lights.
scene = new THREE.Scene();
// create a camera, which defines where we're looking at.
camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
// create a render and set the size
renderer = new THREE.WebGLRenderer();
renderer.setClearColor(new THREE.Color(0x000000));
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMap.enabled = true;
// initialize the trackball controls and the clock which is needed
var trackballControls = initTrackballControls(camera, renderer);
var clock = new THREE.Clock();
// create the ground plane
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;
// rotate and position the plane
plane.rotation.x = -0.5 * Math.PI;
plane.position.x = 15;
plane.position.y = 0;
plane.position.z = 0;
// add the plane to the scene
scene.add(plane);
// create a cube
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;
// position the cube
cube.position.x = -4;
cube.position.y = 3;
cube.position.z = 0;
// add the cube to the scene
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);
// position the sphere
sphere.position.x = 20;
sphere.position.y = 0;
sphere.position.z = 2;
sphere.castShadow = true;
// add the sphere to the scene
scene.add(sphere);
// position and point the camera to the center of the scene
camera.position.x = -30;
camera.position.y = 40;
camera.position.z = 30;
camera.lookAt(scene.position);
// add subtle ambient lighting
var ambienLight = new THREE.AmbientLight(0x353535);
scene.add(ambienLight);
// add spotlight for the shadows
var spotLight = new THREE.SpotLight(0xffffff);
spotLight.position.set(-10, 20, -5);
spotLight.castShadow = true;
scene.add(spotLight);
// add the output of the renderer to the html element
document.getElementById("webgl-output").appendChild(renderer.domElement);
// call the render function
var step = 0;
var controls = new function () {
this.rotationSpeed = 0.02;
this.bouncingSpeed = 0.03;
};
var gui = new dat.GUI();
gui.add(controls, 'rotationSpeed', 0, 0.5);
gui.add(controls, 'bouncingSpeed', 0, 0.5);
render();
function render() {
// update the stats and the controls
trackballControls.update(clock.getDelta());
stats.update();
// rotate the cube around its axes
cube.rotation.x += controls.rotationSpeed;
cube.rotation.y += controls.rotationSpeed;
cube.rotation.z += controls.rotationSpeed;
// bounce the sphere up and down
step += controls.bouncingSpeed;
sphere.position.x = 20 + (10 * (Math.cos(step)));
sphere.position.y = 2 + (10 * Math.abs(Math.sin(step)));
// render using requestAnimationFrame
requestAnimationFrame(render);
renderer.render(scene, camera);
}
function onResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
}
