用webgl画个太阳系（线框图）

浏览数：284 / 时间：2015年06月09日

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Three框架</title>
        <script src="three.min.js"></script>
        <style type="text/css">
           body {
                color: #808080;
                font-family:Monospace;
                font-size:13px;
                text-align:center;

                background-color: #000;
                margin: 0px;
                overflow: hidden;
            }

            #info {
                position: absolute;
                top: 0px; width: 100%;
                padding: 5px;
                z-index: 100;
            }

            a {

                color: #0080ff;
            }

            b { color: lightgreen }

            #stats { position: absolute; top:0; left: 0 }
            #stats #fps { background: transparent !important }
            #stats #fps #fpsText { color: #777 !important }
            #stats #fps #fpsGraph { display: none }

        </style>
        <script>
            var T = THREE;
            var SCREEN_WIDTH = window.innerWidth;
            var SCREEN_HEIGHT = window.innerHeight;
            var container;            
            var renderer;
            var scene;
            var camera;
            var light;
            var cube;
            
            var _earth = 1;
            
            //1300000
            var sun = {
                r : _earth * 2
            }
            
            //0.056
            var shui = {
                r: _earth * 0.1,
                s: 87
            }
            
            //0.86
            var jin = {
                r: _earth * 0.2,
                s: 224
            }
            var earth = {
                r: _earth * 1,
                s: 365
            }
            
            //0.15
            var huo = {
                r: _earth * 1,
                s: 678
            }
            
            //1330
            var mu = {
                r: _earth * 1.5,
                s: 365 * 11
            }
            
            //745
            var tu = {
                r: _earth * 1.1,
                s: 365 * 29
            }
            //65
            var tian = {
                r: _earth * 0.65,
                s: 365 * 84
            }
            //60
            var hai = {
                r: _earth * 0.6,
                s: 365 * 164
            }
            
            var pArr = [sun,shui,jin,earth,huo,mu,tu,tian,hai];
            function initThree() {
               container = document.getElementById(‘canvas-frame‘);       
               renderer = new T.WebGLRenderer({antialias: true});
               renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
               renderer.autoClear = false;
               container.appendChild(renderer.domElement);
            }
            
            function initCamera() {
                camera = new T.PerspectiveCamera(50, SCREEN_WIDTH/SCREEN_HEIGHT,1,1000000000);
                camera.position.z = sun.r * 30;
                camera.position.y = sun.r * 5;
                cameraRig = new THREE.Object3D();
                cameraRig.add(camera)
                scene.add(cameraRig);
            }

            
            function initScene() {
               scene = new T.Scene();
            }

            
            function initLight() {
              
            }

            // A begin
            var meshArr = [];
            function initObject() {
                var geometry = new T.Geometry();
                for(var i =0;i<1000;i++){
                    var vertex = new T.Vector3();
                    vertex.x = T.Math.randFloatSpread(2000);
                    vertex.y = T.Math.randFloatSpread(2000);
                    vertex.z = T.Math.randFloatSpread(2000);
                    geometry.vertices.push(vertex);
                }
                var particles = new THREE.PointCloud( geometry, new THREE.PointCloudMaterial( { color: 0x888888 } ) );
                scene.add( particles );
                
                var l=0;
                for(var i=0;i<pArr.length;i++){
                    var color ;
                    var p;
                    if(i == 0){
                        color = 0xFF0000;
                    }else{
                        color = 0xFFFFFF;
                    }
                    
                    p = new T.Mesh(new T.SphereGeometry(pArr[i].r,16,8), new THREE.MeshBasicMaterial( { color: color, wireframe: true } ));
                    
                    if(i != 0){
                        p.position.x = l + pArr[i].r;
                    }
                    pArr[i].l = l+= pArr[i].r * 2;
                    scene.add(p);
                    meshArr.push(p);
                }
                
                
            }
        // A end

            function threeStart() {
                initThree();
                initScene();
                initCamera();
                initLight();
                initObject();
                renderer.clear();
                renderer.render(scene, camera);
                
                animate();
            }
            
            function render(){
                renderer.clear();
                var now = Date.now() ;
                for(var i =0;i<meshArr.length;i++){
                    if(i == 0){
                    meshArr[i].position.x = 0;
                    meshArr[i].position.y = 0; 
                    meshArr[i].position.z = 0;
                     continue;
                    }
                    var r = now /pArr[i].s;
                    console.log(r);
                    meshArr[i].position.x = Math.cos(r) * pArr[i].l;
                    meshArr[i].position.y = Math.sin(r) * pArr[i].l; 
                    meshArr[i].position.z = Math.sin( r ) * pArr[i].l;
                }
                
                camera.position.x = sun.r * 2;
                camera.position.y = - sun.r;
                camera.position.z = sun.r * 20;
                cameraRig.lookAt(meshArr[0].position);
                renderer.render( scene, camera );
            }
            
            function animate() {

                requestAnimationFrame( animate );

                render();
            }

        </script>
    </head>

    <body onload="threeStart();">
        <div id="canvas-frame"></div>
    </body>
</html>