threejs 鼠标移动控制模型旋转

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<title>threejs鼠标移动控制模型旋转</title>

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

    <!--<script src="http://jsrun.it/assets/a/q/3/W/aq3Wl" type="text/javascript"></script>-->

    <script src="js/threejs/renderers/CanvasRenderer.js"></script>

    <script src="js/threejs/renderers/Projector.js"></script>

    <script src="js/threejs/DDSLoader.js"></script>

        <script src="js/threejs/MTLLoader.js"></script>

        <script src="js/threejs/OBJLoader.js"></script>

    <script src="js/jquery-2.1.1.min.js"></script>

    <script src="https://raw.githack.com/mrdoob/three.js/master/examples/fonts/helvetiker_regular.typeface.js"></script> 

    <script>

    var camera, scene, renderer, geometry, material, mesh;

    var pivot5, pivot6;

    init();

    function init() {

      scene = new THREE.Scene();

      camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 10000);

      camera.position.z = 500;

      camera.position.y = 100;

      scene.add(camera);

      //坐标轴辅助

      var axes = new THREE.AxisHelper(500);

      scene.add(axes);

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

      renderer.setClearColor( 0xffffcc );

      renderer.setPixelRatio( window.devicePixelRatio );

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

      //添加环境光

      var ambient = new THREE.AmbientLight( 0x444444 );

        scene.add( ambient );

        // 添加定向光线

        var directionalLight = new THREE.DirectionalLight( 0xffeedd );

        directionalLight.position.set( 0, 0, 1 ).normalize();

        scene.add( directionalLight );

        var onProgress = function ( xhr ) {

            if ( xhr.lengthComputable ) {

                var percentComplete = xhr.loaded / xhr.total * 100;

                console.log( Math.round(percentComplete, 2) + '% downloaded' );

            }

        };

        //加载obj 、材质、贴图

        var onError = function ( xhr ) { };

        THREE.Loader.Handlers.add( /\.dds$/i, new THREE.DDSLoader() ); 

        var texture = new THREE.Texture();

        var loader = new THREE.OBJLoader();

        loader.setPath( 'models/' );

        pivot5 = new THREE.Object3D();

        //导入obj模型

        loader.load( 'tree.obj', function ( object ) {

            object.traverse( function ( child ) {

                if ( child instanceof THREE.Mesh ) {

                    child.material.map = texture;

                    //将模型放大40倍

                    var n=40;

                    child.scale.x =n;

                    child.scale.y =n;

                    child.scale.z =n;

                }

            } );

            pivot5.position.x = -100;

            pivot5.position.z = 100;

            object.position.x = 0;

            object.position.z = 0;

            object.position.y = 50;

            //scene.add( object );

            pivot5.add(object);

        }, onProgress, onError );

        //导入贴图

        var cubemtlLoader = new THREE.MTLLoader();

        cubemtlLoader.setPath( 'models/' );

        pivot6 = new THREE.Object3D();

        cubemtlLoader.load( 'cube.mtl', function( materials ) {

            materials.preload();

            var objLoader = new THREE.OBJLoader();

            objLoader.setMaterials( materials );

            objLoader.setPath( 'models/' );

            objLoader.load( 'cube.obj', function ( object ) {

                var n= 20;

                object.scale.x =n;

                object.scale.y =n;

                object.scale.z =n;

                //修改旋转轴的坐标点，默认是(0,0,0);

                pivot6.position.x = 100;

                pivot6.position.z = 100;

                object.position.x = 0;

                object.position.z = 0;

                object.position.y = 100;

                pivot6.add(object);

                render();

            }, onProgress, onError );

        });

      scene.add(pivot5);

      scene.add(pivot6);

      document.body.appendChild(renderer.domElement);

      document.addEventListener( 'mousedown', onMouseDown, false );

      document.addEventListener( 'mouseup', onMouseup, false );

    }

    var rotateStart;

    rotateStart = new THREE.Vector2();

    /*

        鼠标移动控制模型旋转思想：

        当按下鼠标时及时当前鼠标的水平坐标clientX1，在鼠标移动的过程中不断触发onMouseMove事件，

        不停的记录鼠标的当前坐标clientX2，由当前坐标减去记录的上一个水平坐标，

        并且将当前的坐标付给上一个坐标clientX1，计算两个坐标的之间的差clientX2-clientX1，

        将得到的差值除以一个常量（这个常量可以根据自己的需要调整），得到旋转的角度

    */

    function onMouseDown(event){

        event.preventDefault();

        mouseDown = true;

        mouseX = event.clientX;//出发事件时的鼠标指针的水平坐标

        rotateStart.set( event.clientX, event.clientY );

        document.addEventListener( 'mousemove', onMouseMove2, false );

    }

    function onMouseup(event){

        mouseDown = false;

        document.removeEventListener("mousemove", onMouseMove2);

    }

    function onMouseMove2(event){

        if(!mouseDown){

            return;

        }

        var deltaX = event.clientX - mouseX;

        mouseX = event.clientX;

        rotateScene(deltaX);

    }

    //设置模型旋转速度，可以根据自己的需要调整

    function rotateScene(deltaX){

        //设置旋转方向和移动方向相反，所以加了个负号

        var deg = -deltaX/279;

        //deg 设置模型旋转的弧度

        pivot5.rotation.y += deg;

        pivot6.rotation.y += deg;

        render();

    }

    function render() {

       renderer.render(scene, camera);

    }

    </script>

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threejs 鼠标移动控制模型旋转

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