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   源码介绍

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# Earth 3D 在线预览
[可能是世界上第二美的 h5](http://yuanqi.li/earth3d/)
[这里是世界上最美的 h5](https://wa.qq.com/xplan/earth/index.html?_wv=5&_wwv=4&adtag=wx&from=groupmessage)

<script>
var camera, scene, renderer;
var earth, cloud;
var pointLight, ambientLight;
var mouseDown = false, mouseX = 0, mouseY = 0;
var stats;

init();
animate();

function init() {
// initialization
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1000);
camera.position.z = 160;
stats = new Stats();
stats.showPanel(0); // 0: fps, 1: ms, 2: mb, 3 : custom
document.body.appendChild( stats.dom );

// Earth terrain
var earth_texture  = new THREE.TextureLoader().load("tx/earth.jpeg");
var earth_bump     = new THREE.TextureLoader().load("tx/bump.jpeg");
var earth_specular = new THREE.TextureLoader().load("tx/spec.jpeg");
var earth_geometry = new THREE.SphereGeometry(30, 32, 32);
var earth_material = new THREE.MeshPhongMaterial({
shininess   : 40,
bumpScale   : 1,
map         : earth_texture,
bumpMap     : earth_bump,
specularMap : earth_specular
});
earth = new THREE.Mesh(earth_geometry, earth_material);
scene.add(earth);

// Earth cloud
var cloud_texture  = new THREE.TextureLoader().load('tx/cloud.png');
var cloud_geometry = new THREE.SphereGeometry(31, 32, 32);
var cloud_material = new THREE.MeshBasicMaterial({
shininess   : 10,
map         : cloud_texture,
transparent : true,
opacity     : 0.8
});
cloud = new THREE.Mesh(cloud_geometry, cloud_material);
scene.add(cloud);

// point light (upper left)
pointLight = new THREE.PointLight(0xffffff);
pointLight.position.set(-400, 100, 150);
scene.add (pointLight);

// ambient light
ambientLight = new THREE.AmbientLight(0x222222);
scene.add(ambientLight);

// renderer
renderer = new THREE.WebGLRenderer({alpha: true});
renderer.setClearColor(0xffffff, 0);
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// event handler
window.addEventListener('resize', onWindowResize, false);
document.addEventListener('mousemove', function (e) {onMouseMove(e);}, false);
document.addEventListener('mousedown', function (e) {onMouseDown(e);}, false);
document.addEventListener('mouseup', function (e) {onMouseUp(e);}, false);
}

function animate() {
requestAnimationFrame(animate);
stats.begin();
earth.rotation.y = 0.001;
cloud.rotation.y = 0.001;
stats.end();
renderer.render(scene, camera);
}

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

function onMouseMove(evt) {
if (!mouseDown) return;
evt.preventDefault();
var deltaX = evt.clientX - mouseX, deltaY = evt.clientY - mouseY;
mouseX = evt.clientX;
mouseY = evt.clientY;
rotateScene(deltaX, deltaY);
}

function onMouseDown(evt) {
evt.preventDefault();
mouseDown = true;
mouseX = evt.clientX;
mouseY = evt.clientY;
}

function onMouseUp(evt) {
evt.preventDefault();
mouseDown = false;
}

function rotateScene(deltaX, deltaY) {
  earth.rotation.y = deltaX / 300;
  earth.rotation.x = deltaY / 300;
  cloud.rotation.y = deltaX / 300;
  cloud.rotation.x = deltaY / 300;
}
</script>