本文搬自我的Github，https://github.com/555chy/three.js-example-comment，有兴趣的可以一起来完善，这个为Three.js的Example进行注解，方便初学者阅读
three.js 官网 Example 地址：https://threejs.org/examples/
<!DOCTYPE html>
<html>
<head>
<title>three.js css3d - panorama</title>
<meta charset="utf-8">
<!--
如果没有设置viewport的width的话，网页很可能会超出手机屏幕宽度，具体多宽，要看浏览器定义的默认宽度是多少
user-scalable=no，规定了用户不能缩放网页，但有些浏览器对该项支持不是很好，故需要设置minimum-scale和maximum-scale相同来限制用户缩放
-->
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
background-color: #000000;
margin: 0;
cursor: move;
overflow: hidden;
}
a {
color: #ffffff;
}
#info {
position: absolute;
width: 100%;
color: #ffffff;
padding: 5px;
font-family: Monospace;
font-size: 13px;
font-weight: bold;
text-align: center;
z-index: 1;
}
</style>
</head>
<body>
<script src="../build/three.js"></script>
<!--
使用CSS3渲染3D的DOM元素
-->
<script src="js/renderers/CSS3DRenderer.js"></script>
<div id="info"><a href="http://threejs.org" target="_blank">three.js css3d</a> - panorama demo. cubemap by <a href="http://www.humus.name/index.php?page=Textures" target="_blank">Humus</a>.</div>
<script>
var camera, scene, renderer;
var geometry, material, mesh;
var target = new THREE.Vector3();
var lon = 90, lat = 0;
var phi = 0, theta = 0;
var touchX, touchY;
init();
animate();
function init() {
/*
PerspectiveCamera(fov, aspect, near, far)
fov(视场)：从相机位置能够看到的部分场景。推荐默认值45
aspect(长宽比)：渲染结果输出区域的横向长度和纵向长度的比值。推荐默认值window.innerWidth/window.innerHeight
near(近面)：定义从距离相机多近的地方开始渲染场景。推荐默认值0.1
far(远面)：定义相机可以从它所处的位置看多远。默认值1000
*/
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 1000 );
scene = new THREE.Scene();
var sides = [
{
url: 'textures/cube/Bridge2/posx.jpg',
position: [ -512, 0, 0 ],
rotation: [ 0, Math.PI / 2, 0 ]
},
{
url: 'textures/cube/Bridge2/negx.jpg',
position: [ 512, 0, 0 ],
rotation: [ 0, -Math.PI / 2, 0 ]
},
{
url: 'textures/cube/Bridge2/posy.jpg',
position: [ 0, 512, 0 ],
rotation: [ Math.PI / 2, 0, Math.PI ]
},
{
url: 'textures/cube/Bridge2/negy.jpg',
position: [ 0, -512, 0 ],
rotation: [ - Math.PI / 2, 0, Math.PI ]
},
{
url: 'textures/cube/Bridge2/posz.jpg',
position: [ 0, 0, 512 ],
rotation: [ 0, Math.PI, 0 ]
},
{
url: 'textures/cube/Bridge2/negz.jpg',
position: [ 0, 0, -512 ],
rotation: [ 0, 0, 0 ]
}
];
/*
var sides = [
{
url: 'textures/cube/test/px.jpg',
position: [ -512, 0, 0 ],
rotation: [ 0, Math.PI / 2, 0 ]
},
{
url: 'textures/cube/test/nx.jpg',
position: [ 512, 0, 0 ],
rotation: [ 0, -Math.PI / 2, 0 ]
},
{
url: 'textures/cube/test/py.jpg',
position: [ 0, 512, 0 ],
rotation: [ Math.PI / 2, 0, Math.PI ]
},
{
url: 'textures/cube/test/ny.jpg',
position: [ 0, -512, 0 ],
rotation: [ - Math.PI / 2, 0, Math.PI ]
},
{
url: 'textures/cube/test/pz.jpg',
position: [ 0, 0, 512 ],
rotation: [ 0, Math.PI, 0 ]
},
{
url: 'textures/cube/test/nz.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( 'img' );
element.width = 1026; // 2 pixels extra to close the gap. 使用额外的两个像素来填补间隙，否则会有一条黑边
element.src = side.url;
var object = new THREE.CSS3DObject( element );
//fromArray(buffer, offset)，从数组的offset位置开始转化为vectorN
object.position.fromArray( side.position );
object.rotation.fromArray( side.rotation );
scene.add( object );
}
renderer = new THREE.CSS3DRenderer();
//设置渲染场景的大小
renderer.setSize( window.innerWidth, window.innerHeight );
//将渲染器的DOM元素(即Canvas)添加到HTML中
document.body.appendChild( renderer.domElement );
document.addEventListener( 'mousedown', onDocumentMouseDown, false );
document.addEventListener( 'wheel', onDocumentMouseWheel, false );
//注意：触摸事件比鼠标事件少了一个touchend，因为暂不存在不放开手指的情况
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
//重新设置相机的宽高比。如果宽高比不对，那么正方形可能就不是正方形了
camera.aspect = window.innerWidth / window.innerHeight;
//更新透视相机的投影矩阵
camera.updateProjectionMatrix();
//重新设置渲染场景的大小
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onDocumentMouseDown( event ) {
//通知 Web 浏览器不要执行与事件关联的默认动作
event.preventDefault();
//在鼠标按下时监听鼠标移动和鼠标弹起事件，避免捕获不必要的事件浪费资源
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'mouseup', onDocumentMouseUp, false );
}
function onDocumentMouseMove( event ) {
//currentEvent.movementX 是两个鼠标移动事件间隔时间中当中鼠标移动的相对坐标( currentEvent.screenX - previousEvent.screenX )
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 ) {
//鼠标弹起时移除不必要的事件
document.removeEventListener( 'mousemove', onDocumentMouseMove );
document.removeEventListener( 'mouseup', onDocumentMouseUp );
}
function onDocumentMouseWheel( event ) {
//delta可以获取鼠标滚轮的方向和速度。如果delta的值是负的，那么滚轮就是向下滚动，正的就是向上。deltaX, deltaY分别是滚轮滚动的坐标值
camera.fov += event.deltaY * 0.05;
//这里要设置一个视场范围，过大或过小的视场都会导致显示异常
camera.fov = Math.max(10, camera.fov);
camera.fov = Math.min(120, camera.fov);
//更新相机的投影矩阵
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;
}
function animate() {
requestAnimationFrame( animate );
lon += 0.1;
//设置仰俯角范围[-85,85]
lat = Math.max( - 85, Math.min( 85, lat ) );
//THREE.Math.degToRad将角度转换成弧度
phi = THREE.Math.degToRad( 90 - lat );
theta = THREE.Math.degToRad( lon );
//相机注视的点是单位球上的一点，这是一个方向向量
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 );
}
</script>
</body>
</html>
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