【three.js练习程序】动画效果，100个方块随机运动

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>ceshi</title>
    <script type="text/javascript" src="C:\Users\asus\Desktop\three.js-master\three.js-master\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 camera, scene, renderer;
    var id = null;
    init();

    function  init()
    {

        scene = new THREE.Scene();
        camera = new THREE.PerspectiveCamera(45,
            window.innerWidth / window.innerHeight, 0.1, 1000);

        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(0xEEEEEE));
        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 );
            }
            var material = new THREE.MeshBasicMaterial( { vertexColors: THREE.FaceColors, overdraw: 0.5 } );

            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;

            scene.add( cube[i] );
            id = setInterval(render, 33);
        }

        function render()
        {
            for(var i=0;i<100;i++)
            {
                cube[i].position.x += Math.random()-0.5;
                cube[i].position.y += Math.random()-0.5;
                cube[i].position.z += Math.random()-0.5;

                if(Math.abs(cube[i].position.x)>100)
                    cube[i].position.x=0;
                if(Math.abs(cube[i].position.y)>100)
                    cube[i].position.y=0;
                if(Math.abs(cube[i].position.z)>100)
                    cube[i].position.z=0;
            }

            renderer.render( scene, camera );
        }

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

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