3D全景漫游

摘要：可选，默认值为，设置为则禁止用户和全景图交互导航条不可用。可选，默认值为，全景图在毫秒后会自动进行动画。当全景图准备就绪并且第一张图片显示时的回调函数。

示例：
​    打造H5里的“3D全景漫游”秘籍 - 腾讯ISUX
​    QQ物联星球计划

通过pano2vr直接将鱼眼全景图生成立体空间的六个面；也可通过Photoshop或其他的专业3D建模工具，将鱼眼图贴到3D球面上，再将球面转为立方面，获得立体空间的六个面。
使用到的JS库：

three.min.js

CSS3DRenderer.js


源码Demo：http://mrleo.github.io/3DPanorama

camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1000);

scene = new THREE.Scene();

var sides = [{
    url: "../static/img/gugong/posx.jpg",
    position: [-512, 0, 0],
    rotation: [0, Math.PI / 2, 0]
}, {
    url: "../static/img/gugong/negx.jpg",
    position: [512, 0, 0],
    rotation: [0, -Math.PI / 2, 0]
}, {
    url: "../static/img/gugong/posy.jpg",
    position: [0, 512, 0],
    rotation: [Math.PI / 2, 0, Math.PI]
}, {
    url: "../static/img/gugong/negy.jpg",
    position: [0, -512, 0],
    rotation: [-Math.PI / 2, 0, Math.PI]
}, {
    url: "../static/img/gugong/posz.jpg",
    position: [0, 0, 512],
    rotation: [0, Math.PI, 0]
}, {
    url: "../static/img/gugong/negz.jpg",
    position: [0, 0, -512],
    rotation: [0, 0, 0]
}];

for (var i = 0; i < sides.length; i++) {
    var side = sides[i];
    var element = document.createElement("section");
    element.id = "section_"+i;
    var imgElement = document.createElement("img");
    imgElement.width = 1026; // 2 pixels extra to close the gap.
    imgElement.src = side.url;
    element.appendChild(imgElement);
    var object = new THREE.CSS3DObject(element);
    object.position.fromArray(side.position);
    object.rotation.fromArray(side.rotation);
    scene.add(object);
}

renderer = new THREE.CSS3DRenderer();//定义渲染器
renderer.setSize(window.innerWidth, window.innerHeight);//设置尺寸
document.body.appendChild(renderer.domElement);//将场景加入页面

function animate() {
    requestAnimationFrame(animate);
    //lon = Math.max(-180, Math.min(180, lon));//限制固定角度内旋转
    //lon += 0.1;//自动旋转
    lon += 0;
    lat = Math.max(-85, Math.min(85, lat));
    phi = THREE.Math.degToRad(90 - lat);
    theta = THREE.Math.degToRad(lon);
    target.x = Math.sin(phi) * Math.cos(theta);
    target.y = Math.cos(phi);
    target.z = Math.sin(phi) * Math.sin(theta);
    camera.lookAt(target);
    renderer.render(scene, camera);
}

function addIcon(){
    var imgIcon = document.createElement("img");
    imgIcon.src = "../static/img/arrow_right.png";
    imgIcon.classList.add("icon");
    document.getElementById("section_4").appendChild(imgIcon);
}
addIcon();

function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();
    renderer.setSize(window.innerWidth, window.innerHeight);
}

function onDocumentMouseDown(event) {
    event.preventDefault();
    document.addEventListener("mousemove", onDocumentMouseMove, false);
    document.addEventListener("mouseup", onDocumentMouseUp, false);
}

function onDocumentMouseMove(event) {
    var movementX = event.movementX || event.mozMovementX || event.webkitMovementX || 0;
    var movementY = event.movementY || event.mozMovementY || event.webkitMovementY || 0;
    lon -= movementX * 0.1;
    lat += movementY * 0.1;
}

function onDocumentMouseUp(event) {
    document.removeEventListener("mousemove", onDocumentMouseMove);
    document.removeEventListener("mouseup", onDocumentMouseUp);
}

/**
 * 鼠标滚轮改变相机焦距
 */
function onDocumentMouseWheel(event) {
    camera.fov -= event.wheelDeltaY * 0.05;
    camera.updateProjectionMatrix();
}

function onDocumentTouchStart(event) {
    event.preventDefault();
    var touch = event.touches[0];
    touchX = touch.screenX;
    touchY = touch.screenY;
}

function onDocumentTouchMove(event) {
    event.preventDefault();
    var touch = event.touches[0];
    lon -= (touch.screenX - touchX) * 0.1;
    lat += (touch.screenY - touchY) * 0.1;
    touchX = touch.screenX;
    touchY = touch.screenY;
}

Photo Sphere Viewer是一款基于Three.js的360X180度全景图预览js插件。该js插件可以360度旋转查看全景图，也可以上下180度查看图片。使用该插件的唯一要求是浏览器支持canvas或WebGL。

使用该全景图插件时要引入three.min.js和photo-sphere-viewer.min.js文件。

可以创建一个空的

var PSV = new PhotoSphereViewer({
    // Path to the panorama
    panorama: "1.jpg",
 
    // Container
    container: div
}); 

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