This two last weeks were very exciting thanks to Adobe’s announcement : a new framework for 2D games : Starling, running on top of Stage3D (Molehill). Flash Player 11 is out henceforth, new 3D frameworks are coming : Adobe Proscenium, Aerys. And other big things like Unreal Engine 3 with Unreal Tournament 3 in our browser !
There’s a lot to digest ! Starling may be the next thing I will experiment…
Anyway, before all this annoucement, I was keeping an eye on JavaScript and its most awesome framework : ThreeJS created by Mr Doob. ThreeJS is a “lightweight 3D engine with a very low level of complexity — in other words, for dummies”. Dummy ? This is what I’m with 3D engine… in fact this is the first time that I try a 3D engine… so let’s start !
The three.js repository is on github with code source and many examples.
I started to learn ThreeJS with Ilmari Heikkinen’s slides that you can find here. It is really a good way to start.
Click here to see my experimentation.
I used three.js with WebGL render. My source code :
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<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>three.js</title>
<style type="text/css">
body {
color: #808080;
font-family:Monospace;
font-size:13px;
text-align:center;
background-color: #ffffff;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px; width: 100%;
padding: 5px;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info"><a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a></div>
<script type="text/javascript" src="Three.js"></script>
<script type="text/javascript" src="raf.js"></script>
<script type="text/javascript">
var renderer = new THREE.WebGLRenderer({antialias: true});
renderer.setSize(document.body.clientWidth, document.body.clientHeight);
document.body.appendChild(renderer.domElement);
renderer.setClearColorHex(0xEEEEEE, 1.0);
renderer.clear();
renderer.shadowCameraFov = 50;
renderer.shadowMapWidth = 1024;;
renderer.shadowMapHeight = 1024;
var fov = 45; // camera field-of-view in degrees
var width = renderer.domElement.width;
var height = renderer.domElement.height;
var aspect = width / height; // view aspect ratio
var near = 1; // near clip plane
var far = 10000; // far clip plane
var camera = new THREE.Camera(fov, aspect, near, far);
camera.position.z = -400;
camera.position.x = 200;
camera.position.y = 350;
const NBR_ELEMENTS = 250;
var scene = new THREE.Scene();
var light = new THREE.SpotLight();
light.castShadow = true;
light.position.set( 170, 330, -160 );
scene.addLight(light);
var tab = [];
var sprite;
for (var i = 0; i < NBR_ELEMENTS; ++i) {
sprite = new THREE.Mesh(new THREE.CubeGeometry(25, 25, 25), new THREE.MeshLambertMaterial({color: Math.random() * 0xffffff}));
sprite.castShadow = true;
scene.addChild(sprite);
if (i == 0)
sprite.position.x = Math.random() * 1000;
else
sprite.position.x = (Math.random() > 0.5) ? Math.random() * 1000 : -Math.random() * 1000;
sprite.position.y = (Math.random() > 0.5) ? Math.random() * 1000 : -Math.random() * 1000;
sprite.position.z = (Math.random() > 0.5) ? Math.random() * 1000 : -Math.random() * 1000;
tab.push(sprite);
}
var oneElement = false;
var diffx;
var diffy;
var diffz;
var i = 0;
renderer.shadowMapEnabled = true;
renderer.render(scene, camera);
var paused = false;
var last = new Date().getTime();
var down = false;
var sx = 0, sy = 0;
window.onmousedown = function (ev){
down = true; sx = ev.clientX; sy = ev.clientY;
};
window.onmouseup = function(){ down = false; };
window.onmousemove = function(ev) {
if (down) {
var dx = ev.clientX - sx;
var dy = ev.clientY - sy;
camera.position.x += dx;
camera.position.y += dy;
sx += dx;
sy += dy;
}
}
function animate(t) {
if (!paused) {
/*last = t;
sphere.position.x = Math.cos(t/600)*300;
sphere.position.z = Math.sin(t/600)*300;
sphere.rotation.y = t/800;*/
if (oneElement) {
if (tab[0].position.x < 1000) {
i = 0;
while (i < NBR_ELEMENTS) {
diffx = 0 - tab[i].position.x;
diffy = 0 - tab[i].position.y;
diffz = 0 - tab[i].position.z;
tab[i].position.x -= diffx * 0.05;
tab[i].position.y -= diffy * 0.05;
tab[i].position.z -= diffz * 0.05;
++i;
}
} else {
oneElement = false;
}
} else {
if (tab[0].position.x > 1) {
i = 0;
while (i < NBR_ELEMENTS) {
diffx = 0 - tab[i].position.x;
diffy = 0 - tab[i].position.y;
diffz = 0 - tab[i].position.z;
tab[i].position.x += diffx * 0.05;
tab[i].position.y += diffy * 0.05;
tab[i].position.z += diffz * 0.05;
++i;
}
} else {
oneElement = true;
}
}
renderer.clear();
renderer.render(scene, camera);
}
window.requestAnimationFrame(animate, renderer.domElement);
};
animate(new Date().getTime());
onmessage = function(ev) {
paused = (ev.data == 'pause');
};
</script>
</body>
</html> |
I used raf.js to make an “enter frame” on the page, you can find the script on Ilmari Heikkinen’s repository.
2 thoughts on “Quick look into ThreeJS”