three.js实现炫酷的全景3D重力感应

本文实例为大家分享了three.js 全景重力感应的具体代码，供大家参考，具体内容如下

实现three.js 全景图 demo

使用three.js 写了球体和圆柱体版本的3D重力感应全景图，支持手指触摸和陀螺仪感应，也支持PC端的鼠标。给大家介绍一下基于移动端H5球体的实现方法，圆柱体类似。

设置容器和展示的样式
设置容器的宽高为全屏展示，清除body的margin,引用three.min.js（3D渲染框架） 和orienter.js (陀螺仪经纬度计算)

<div id="CanvasBody"></div>

<script src="js/three.min.js"></script>
<!--重力感应-->
<script src="js/orienter.js"></script>
<!--动画效果-->
<script src="js/tween.js"></script>
<!-- 代码 -->

body {margin: 0;}
html, body, #CanvasBody {width: 100vw;height: 100vh;overflow: hidden;}
#CanvasBody {position: relative;}

设置html的data-dpr 属性，设置html 的fontSize

设置html的fontSize,重新计算body的实际可展示尺寸，这样可以使渲染出来的画面更清晰，分辨率最完美。

(function(_window) {
 var navigatorUserAgent = navigator.userAgent;
 var iPhone = navigatorUserAgent.indexOf("iPhone");
 if (iPhone > -1) {
  var dpr = Number(window.devicePixelRatio),
    one_dpr = 1 / dpr
 } else {
  var dpr = 1,
   one_dpr = 1
 }
 var writeText = "<meta name=\"viewport\" content=\"width=device-width,initial-scale=" + one_dpr + ",maximum-scale=" + one_dpr + ",minimum-scale=" + one_dpr + ",user-scalable=no\">\n  <meta name=\"'flexible\" content=\"initial-dpr=" + dpr + "\">";
 document.write(writeText);
 var html = document.getElementsByTagName("html");
 var F0 = 75;
 html[0].setAttribute("data-dpr", dpr);
 var getFontSize = function getFontSize() {
  var windowWidth = window.innerWidth;
  html[0].style.fontSize = F0 * windowWidth / 750 + "px"
 };
 getFontSize();
 _window.addEventListener("resize", getFontSize, false)
})(window);

定义相关变量

var camera,//摄像机
 scene,//舞台
 renderer,//渲染器
 isUserInteracting = false,//用户是否正在操作
 onMouseDownMouseX = 0, onMouseDownMouseY = 0,//鼠标点击的x和Y坐标
 lon = 0, onMouseDownLon = 0, onPointerDownLon= 0.0,onPointerDownPointerX = 0,//经度
 lat = 0, onMouseDownLat = 0, onPointerDownLat= 0.0,onPointerDownPointerY = 0,//纬度
 phi = 0, theta = 0,//计算相机位置的重要参数
 o = new Orienter(),//陀螺仪方法对象
 new_longitude=0,last_longitude=0,move_longitude=0,//改变的经度的计算
 new_latitude=0,last_latitude=0,move_latitude=0,//改变的纬度的计算
 is_touch=false,is_start=false,isPlay=true,isMusicPlay=true,tsa=100.1,ppl='';
 var raycaster = new THREE.Raycaster();//拾取场景里面的物体,可判断点击或交互事件对应的元素
 var mouse = new THREE.Vector2();//二维向量的对象，鼠标计算

初始化舞台的元素和内容

图片的长宽控制在4096px以内，部分机型性能不够，渲染不了超大的图片

 function init() {/**初始化**/
    var container, mesh;//容器和素材
    container = document.getElementById( 'CanvasBody' );//容器
    camera = new THREE.PerspectiveCamera( 72, window.innerWidth / window.innerHeight, 0.01, 1100 );//相机
    camera.target = new THREE.Vector3( 0, 0, 0 );//相机位置

    scene = new THREE.Scene();//舞台
    scene.updateMatrixWorld(true);
    var geometry = new THREE.SphereGeometry(1, 32, 16);//球体

    geometry.scale( 1, 1, -1 );
    //设置球体的背景贴图
    var textureBg = new THREE.TextureLoader().load("img/bg.jpg");
    textureBg.generateMipmaps = true;
    textureBg.magFilter = THREE.LinearFilter;//设置贴纸素材的质量
    textureBg.minFilter = THREE.LinearFilter;
    var material = new THREE.MeshBasicMaterial( {
      map: textureBg,//圆柱体贴图，全景图
      //color:0xFF0000,
      //transparent: true
    } );
    mesh = new THREE.Mesh( geometry, material );
    //这里可以设置对应的动画效果
//    new TWEEN.Tween( mesh).to( {transform:"rotate(90deg)"}, 800 ).repeat( false ).delay( 300 ).yoyo( true ).easing( TWEEN.Easing.Cubic.InOut ).start();
    scene.add( mesh );

    // 旋转预设 摄影机看到的角度 Start//
    scene.rotation.set(0,0,0); //首頁

    //初始化渲染器，追加到容器
    renderer = new THREE.WebGLRenderer({precision: 'highp' ,mipmap: 'highp',antialias:false});//加上precision 和 mipmap参数，调整画面清晰度
    renderer.setPixelRatio( window.devicePixelRatio );//设置像素比
    renderer.setSize( window.innerWidth, window.innerHeight );//设置渲染窗口的大小
    container.appendChild( renderer.domElement );//追加到容器中去

    //鼠标、手机touch的各个事件
    document.addEventListener( 'mousedown', onDocumentMouseDown, false );
    document.addEventListener( 'mousemove', onDocumentMouseMove, false );
    document.addEventListener( 'mouseup', onDocumentMouseUp, false );

    document.addEventListener( 'touchstart', onDocumentTouchDown, false );
    document.addEventListener( 'touchmove', onDocumentTouchMove, false );
    document.addEventListener( 'touchend', onDocumentTouchUp, false );
    // document.addEventListener( 'wheel', onDocumentMouseWheel, false );
    //
    document.addEventListener( 'dragover', function ( event ) {
      event.preventDefault();
      event.dataTransfer.dropEffect = 'copy';
    }, false );
    document.addEventListener( 'dragenter', function ( event ) {
      document.body.style.opacity = 0.5;
    }, false );
    document.addEventListener( 'dragleave', function ( event ) {
      document.body.style.opacity = 1;
    }, false );
    document.addEventListener( 'drop', function ( event ) {
      event.preventDefault();
      var reader = new FileReader();
      reader.addEventListener( 'load', function ( event ) {
        material.map.image.src = event.target.result;
        material.map.needsUpdate = true;
      }, false );
      reader.readAsDataURL( event.dataTransfer.files[ 0 ] );
      document.body.style.opacity = 1;
    }, false );
  }

监听的各事件和方法

//监听横竖屏重新设置尺寸
  function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();
    renderer.setSize( window.innerWidth, window.innerHeight );
  }
  function onDocumentMouseDown( event ) {
    event.preventDefault();
    isUserInteracting = true;
    onPointerDownPointerX = event.clientX;
    onPointerDownPointerY = event.clientY;
    onPointerDownLon = lon;
    onPointerDownLat = lat;

    // Click action
    mouse.x = ( event.clientX / renderer.domElement.clientWidth ) * 2 - 1;
    mouse.y = - ( event.clientY / renderer.domElement.clientHeight ) * 2 + 1;
    raycaster.setFromCamera( mouse, camera );
    var intersects = raycaster.intersectObjects( scene.children );//第一个是最上面一层的元素
    console.log("点击的元素",intersects);
    if ( intersects.length > 0 ) {//如果点到小圆点 就执行回调函数回调函数为goto_p
      try {
        intersects[0].object.callback();
      }
      catch(err) {}
    }
  }
  function onDocumentMouseMove( event ) {
    if ( isUserInteracting === true ) {
      lon = ( onPointerDownPointerX - event.clientX ) * 0.1 + onPointerDownLon;
      lat = ( event.clientY - onPointerDownPointerY ) * 0.1 + onPointerDownLat;
    }
  }
  function onDocumentMouseUp( event ) {
    isUserInteracting = false;
  }

  // touch event start
  function onDocumentTouchDown( event ) {
    is_touch=true;

    event.preventDefault();
    isUserInteracting = true;
    onPointerDownPointerX = event.touches[ 0 ].clientX;
    onPointerDownPointerY = event.touches[ 0 ].clientY;
    if(is_start){
      onPointerDownLon = lon;
      onPointerDownLat = lat;
    }
    // For Click action

    mouse.x = ( onPointerDownPointerX / renderer.domElement.clientWidth ) * 2 - 1;
    mouse.y = - ( onPointerDownPointerY / renderer.domElement.clientHeight ) * 2 + 1;

    raycaster.setFromCamera( mouse, camera );
    var intersects = raycaster.intersectObjects( scene.children );
    console.log('touchDown',lon,lat);
    if ( intersects.length > 0 ) {
      try {
        intersects[0].object.callback();
      }
      catch(err) {}
    }
  }
  function onDocumentTouchMove( event ) {
    if(is_start){
      if ( isUserInteracting === true ) {

        lon = ( onPointerDownPointerX - event.touches[ 0 ].clientX ) * 0.1 + onPointerDownLon;
        lat = ( event.touches[ 0 ].clientY - onPointerDownPointerY ) * 0.1 + onPointerDownLat;
      }
    }
  }
  function onDocumentTouchUp( event ) {
    is_touch=false;
  }
  // touch event end

  // set
  function onDocumentTouchDown2( event ) {
    tsa = event.touches[0].clientY;
    console.log( '@:'+event.touches[0].clientY );
    event.preventDefault();

  }
  function onDocumentMouseWheel( event ) {
    camera.fov += event.deltaY * 0.05;
    camera.updateProjectionMatrix();
  }

动画播放和陀螺仪

function animate() {//播放动画
    if(isPlay){
      TWEEN.update();
      update();
      requestAnimationFrame( animate );
    }

  }
  o.onOrient = function (obj) {//重力感应计算角度
    if(is_start){
      //最新经度
      new_longitude = obj.lon;
      move_longitude=new_longitude-last_longitude;

      //最新纬度
      new_latitude = obj.lat;
      move_latitude = new_latitude-last_latitude;

      //判断经纬度
      if(move_longitude>=300){
        move_longitude=move_longitude-361;
      }else if(move_longitude<=-300){
        move_longitude=move_longitude+359;
      }

      if(move_latitude>=300){
        move_latitude=move_latitude-361;
      }else if(move_latitude<=-300){
        move_latitude=move_latitude+359;
      }

      if( is_touch ){
        move_longitude=0;
        move_latitude=0;
      }else{
        move_longitude=move_longitude*0.6;
        move_latitude=move_latitude*0.6;
      }
      //计算得出重力感应的经纬度
      lon=lon-move_longitude;
      last_longitude = obj.lon;
      lat = lat-move_latitude;
      last_latitude = obj.lat;
    }

  };

  function update() {//更新摄像机位置，旋转平移
    //lat = Math.max( -6, Math.min( 6, lat ) );//设置lat纬度的范围，只在一个范围内旋转
    phi = THREE.Math.degToRad( 90 - lat );
    theta = THREE.Math.degToRad( lon );
    camera.target.x = 500 * Math.sin( phi ) * Math.cos( theta );//X轴的坐标
    camera.target.y = 500 * Math.cos( phi );//y轴的坐标
    camera.target.z = 500 * Math.sin( phi ) * Math.sin( theta ) ;//z轴的坐标
    camera.lookAt( camera.target );
    renderer.render( scene, camera );//重新渲染
  }

执行所有

//执行所有
  is_start=true;
  init();
  o.init();
  animate();

综上，炫酷的3D重力感应H5就出来啦！

源码 GitHub

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