Three.js 浩瀚星空图

Three.js开发三个要素： A scene, a camera, and a renderer，so we can render the scene with the camera http://threejs.org/docs/#Manual/Introduction/Creating_a_scene

《aframe.js 3d拼图代码详解》作品已被踏得网收录！

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编译

JavaScript

var scene, camera, renderer;

/* We need this stuff too */
var container, star, aspectRatio,
    HEIGHT, WIDTH, fieldOfView,
    nearPlane, farPlane, colors = [],
    mouseX, mouseY, windowHalfX,
    windowHalfY, stats;

init();
animate();

function init() {
    container = document.createElement('div');
    document.body.appendChild(container);
    document.body.style.overflow = "hidden";

HEIGHT = window.innerHeight;
    WIDTH = window.innerWidth;
    aspectRatio = WIDTH / HEIGHT;
    fieldOfView = 75;
    nearPlane = 1;
    farPlane = 1000;
    mouseX = 0;
    mouseY = 0;

windowHalfX = WIDTH / 2;
    windowHalfY = HEIGHT / 2;

/* 	fieldOfView — Camera frustum vertical field of view.
		aspectRatio — Camera frustum aspect ratio.
		nearPlane — Camera frustum near plane.
		farPlane — Camera frustum far plane.

- http://threejs.org/docs/#Reference/Cameras/PerspectiveCamera

In geometry, a frustum (plural: frusta or frustums) 
	 	is the portion of a solid (normally a cone or pyramid) 
	 	that lies between two parallel planes cutting it. - wikipedia.		*/

camera = new THREE.PerspectiveCamera(fieldOfView, aspectRatio, nearPlane, farPlane);

//Z positioning of camera

camera.position.z = farPlane / 2;

scene = new THREE.Scene({
        antialias: true
    });
    scene.fog = new THREE.FogExp2(0x000000, 0.0003);

// The wizard's about to get busy.
    starForge();

//check for browser Support
    if (webGLSupport()) {
        //yeah?  Right on...
        renderer = new THREE.WebGLRenderer({
            alpha: true
        });

} else {
        //No?  Well that's okay.
        renderer = new THREE.CanvasRenderer();
    }

renderer.setClearColor(0x000011, 1);
    renderer.setPixelRatio(window.devicePixelRatio);
    renderer.setSize(WIDTH * devicePixelRatio, HEIGHT * devicePixelRatio);
    container.appendChild(renderer.domElement);

stats = new Stats();
    stats.domElement.style.position = 'absolute';
    stats.domElement.style.top = '0px';
    stats.domElement.style.right = '0px';
    container.appendChild(stats.domElement);

window.addEventListener("resize", onWindowResize, false);
    document.addEventListener('mousemove', onMouseMove, false);

}

function animate() {
    requestAnimationFrame(animate);
    render();
    stats.update();
}

function render() {
    camera.position.x += (mouseX - camera.position.x) * 0.005;
    camera.position.y += (-mouseY - camera.position.y) * 0.005;
    camera.lookAt(scene.position);
    renderer.render(scene, camera);
}

function webGLSupport() {
    /* 	The wizard of webGL only bestows his gifts of power
		to the worthy.  In this case, users with browsers who "get it".		*/

try {
        var canvas = document.createElement("canvas");
        return !!(window.WebGLRenderingContext && (
            canvas.getContext("webgl") || canvas.getContext("experimental-webgl")));
    } catch (e) {
        console.warn("Hey bro, for some reason we're not able to use webGL for this.  No biggie, we'll use canvas.");
        return false;
    }
}

function onWindowResize() {

// Everything should resize nicely if it needs to!
    var WIDTH = window.innerWidth,
        HEIGHT = window.innerHeight;

camera.aspect = aspectRatio;
    camera.updateProjectionMatrix();
    renderer.setSize(WIDTH, HEIGHT);
}

function starForge() {
    /* 	Yep, it's a Star Wars: Knights of the Old Republic reference,
		are you really surprised at this point? 
												*/
    var starQty = 100000;
    geometry = new THREE.SphereGeometry(1000, 100, 50);

materialOptions = {
        size: 1.0, //I know this is the default, it's for you.  Play with it if you want.
        transparency: true,
        opacity: 0.7
    };

starStuff = new THREE.PointCloudMaterial(materialOptions);

// The wizard gaze became stern, his jaw set, he creates the cosmos with a wave of his arms

for (var i = 0; i < starQty; i++) {

var starVertex = new THREE.Vector3();
        starVertex.x = Math.random() * 2000 - 1000;
        starVertex.y = Math.random() * 2000 - 1000;
        starVertex.z = Math.random() * 2000 - 1000;

geometry.vertices.push(starVertex);

}

stars = new THREE.PointCloud(geometry, starStuff);
    scene.add(stars);
}

function onMouseMove(e) {

mouseX = e.clientX - windowHalfX;
    mouseY = e.clientY - windowHalfY;
}

编译

CSS

HTML

Three.js开发三个要素： A scene, a camera, and a renderer，so we can render the scene with the camera http://threejs.org/docs/#Manual/Introduction/Creating_a_scene

编辑器支持Emmet

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Three.js开发三个要素： A scene, a camera, and a renderer，so we can render the scene with the camera http://threejs.org/docs/#Manual/Introduction/Creating_a_scene

Three.js 3D 星云图

WebGL Three.js高质量3D旋转地球卫星云图着色器代码

编辑器支持Emmet

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