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【three.js练习程序】旋转物体自身

2018-02-15 13:56 621 查看

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ceshi</title>
<script type="text/javascript" src=".\build\three.js"></script>
<style>
body
{
margin: 0;
overflow: hidden;
}
</style>
</head>
<body>
<!-- 作为Three.js渲染器输出元素 -->
<div id="WebGL-output">
</div>
<!-- 第一个 Three.js 样例代码 -->
<script type="text/javascript">

var cube = new Array(100);
var rotx = new Array(100);
var roty = new Array(100);
var rotz = new Array(100);
var camera, scene, renderer;
var id = null;
var fov = 45;
var near = 0.1;
var far = 1000;
init();

function init() {

scene = new THREE.Scene();

camera = new THREE.PerspectiveCamera(fov, window.innerWidth / window.innerHeight, near, far);

camera.position.x = 100;
camera.position.y = 100;
camera.position.z = 100;
camera.lookAt(scene.position);

//创建一个WebGL渲染器并设置其大小
renderer = new THREE.WebGLRenderer();
renderer.setClearColor(new THREE.Color(0x000000));
renderer.setSize(window.innerWidth, window.innerHeight);

var axes = new THREE.AxisHelper(200);
scene.add(axes);

for (var i = 0; i < 100; i++) {
var geometry = new THREE.BoxGeometry(5, 5, 5);
for (var j = 0; j < geometry.faces.length; j += 2) {
var hex = Math.random() * 0xffffff;
geometry.faces[j].color.setHex(hex);
geometry.faces[j + 1].color.setHex(hex);
}

rotx[i] = Math.random() * 0.005;
roty[i] = Math.random() * 0.005;
rotz[i] = Math.random() * 0.005;
var material = new THREE.MeshBasicMaterial({ vertexColors: 0xff0000 });
cube[i] = new THREE.Mesh(geometry, material);

cube[i].position.x = Math.random() * 100 - 50;
cube[i].position.y = Math.random() * 100 - 50;
cube[i].position.z = Math.random() * 100 - 50;
cube[i].receiveShadow = true;
scene.add(cube[i]);
id = setInterval(render, 33);
}

document.addEventListener('mousewheel', mousewheel, false);

}
function render() {
for (var i = 0; i < 100; i++)
{
cube[i].rotation.x += rotx[i];
cube[i].rotation.y += roty[i];
cube[i].rotation.z += rotz[i];
}

renderer.render(scene, camera);
}

function mousewheel(e) {
e.preventDefault();
//e.stopPropagation();
if (e.wheelDelta) {  //判断浏览器IE，谷歌滑轮事件
if (e.wheelDelta > 0) { //当滑轮向上滚动时
fov -= (near < fov ? 1 : 0);
}
if (e.wheelDelta < 0) { //当滑轮向下滚动时
fov += (fov < far ? 1 : 0);
}
} else if (e.detail) {  //Firefox滑轮事件
if (e.detail > 0) { //当滑轮向上滚动时
fov -= 1;
}
if (e.detail < 0) { //当滑轮向下滚动时
fov += 1;
}
}
camera.fov = fov;
camera.updateProjectionMatrix();
renderer.render(scene, camera);

}

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

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

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