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    <title>three.js webgl - scene animation</title>

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        body {

            color: #000;

            font-family:Monospace;

            font-size:13px;

            text-align:center;

            background-color: #fff;

            margin: 0px;

            overflow: hidden;

        }

        #info {

            position: absolute;

            top: 0px; width: 100%;

            padding: 5px;

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        a {

            color: #0af;

        }

    </style>

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<body>

<div id="container"></div>

<div id="info">

    <a href="http://threejs.org" target="_blank">three.js</a> webgl - scene animation - <a href="https://clara.io/view/96106133-2e99-40cf-8abd-64defd153e61">Three Gears Scene</a> courtesy of David Sarno</div>

<script src="../build/three.js"></script>

<script src="js/Detector.js"></script>

<script src="js/libs/stats.min.js"></script>

<script>

    var SCREEN_WIDTH = window.innerWidth;

    var SCREEN_HEIGHT = window.innerHeight;

    var FLOOR = -250;

    var container,stats;

    var camera, scene, sceneAnimationClip;

    var renderer;

    var mesh, helper;

    var mixer;

    var mouseX = 0, mouseY = 0;

    var windowHalfX = window.innerWidth / 2;

    var windowHalfY = window.innerHeight / 2;

    var clock = new THREE.Clock();

    document.addEventListener( 'mousemove', onDocumentMouseMove, false );

    init();

    animate();

    function init() {

        container = document.getElementById( 'container' );

        camera = new THREE.PerspectiveCamera( 30, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );

        camera.position.z = 150;

        scene = new THREE.Scene();

        scene.fog = new THREE.Fog( 0xffffff, 2000, 10000 );

        //scene.add( camera );

        // GROUND

        var geometry = new THREE.PlaneBufferGeometry( 16000, 16000 );

        var material = new THREE.MeshPhongMaterial( { emissive: 0x000000 } );

//        var ground = new THREE.Mesh( geometry, material );

//        ground.position.set( 0, FLOOR, 0 );

//        ground.rotation.x = -Math.PI/2;

//        /*scene.add( ground );*/

//

//        ground.receiveShadow = true;

        // RENDERER

        renderer = new THREE.WebGLRenderer( { antialias: true } );

        renderer.setClearColor( scene.fog.color );

        renderer.setPixelRatio( window.devicePixelRatio );

        renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );

        renderer.domElement.style.position = "relative";

        container.appendChild( renderer.domElement );

        renderer.gammaInput = true;

        renderer.gammaOutput = true;

        renderer.shadowMap.enabled = true;

        // STATS

        stats = new Stats();

        container.appendChild( stats.dom );

        //

        var loader = new THREE.ObjectLoader();

        loader.load( "models/json/scene-animation.json", function ( loadedScene ) { //这里的json应该是通过

                                                                                 //三维建模软件之类导出来的，包含模型和动画

            sceneAnimationClip = loadedScene.animations[0];

            scene = loadedScene;

            scene.add( camera );

            scene.fog = new THREE.Fog( 0xffffff, 2000, 10000 ); //感觉并没有什么用

            mixer = new THREE.AnimationMixer( scene );      //动画场景？

            mixer.clipAction( sceneAnimationClip ).play(); //播放动画？

        } );

        window.addEventListener( 'resize', onWindowResize, false );

    }

    function onWindowResize() {

        windowHalfX = window.innerWidth / 2;

        windowHalfY = window.innerHeight / 2;

        camera.aspect = window.innerWidth / window.innerHeight;

        camera.updateProjectionMatrix();

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

    }

    function onDocumentMouseMove( event ) {

        mouseX = ( event.clientX - windowHalfX );

        mouseY = ( event.clientY - windowHalfY );

    }

    //

    function animate() {

        requestAnimationFrame( animate );

        render();

        stats.update();

    }

    function render() {

        var delta = 0.75 * clock.getDelta();   //时间间隔

        camera.position.x += ( mouseX - camera.position.x ) * .05;

        camera.position.y = THREE.Math.clamp( camera.position.y + ( - mouseY - camera.position.y ) * .05, 0, 1000 );

        camera.lookAt( scene.position );

        if( mixer ) {

           // console.log( "updating mixer by " + delta );

            mixer.update( delta );

        }

        renderer.render( scene, camera );

    }

</script>

</body>

</html>

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