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shooting_at_things.html
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<!doctype html>
<html lang="en">
<head>
<title>Shooting at things with three.js (re-usable Ray Class)</title>
<meta charset="utf-8">
<style>
body {
background-color: #000000;
margin: 0px;
overflow: hidden;
font-family:Monospace;
font-size:13px;
text-align:center;
font-weight: bold;
text-align:center;
}
a {
color:#0078ff;
}
#info {
color:#fff;
position: absolute;
top: 0px; width: 100%;
padding: 5px;
z-index:100;
}
#stats {
position: absolute;
right: 10px;
top: 5px;
width: 200px;
color:#fff;
text-align: left;
}
</style>
</head>
<body>
<div id="info">
- Shooting at things with <a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> -<br>
Look around until you find the boxes, then hold down the mouse button to fire.
</div>
<div id="stats">
<div>Time: <span id="time"></span></div>
<div>Targets left: <span id="targetsLeft"></span></div>
<div>Bullets fired: <span id="bulletsFired"></span></div>
<div>Bullets hit: <span id="bulletsHit"></span></div>
</div>
<script src="three.js/build/Three.js"></script>
<script src="ReusableRay.js"></script>
<script src="three.js/js/Detector.js"></script>
<script src="three.js/js/Stats.js"></script>
<script>
if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
var SPEED = 10;
var INTERVAL = 100;
var MAX_LIFETIME = 10000;
var container, stats;
var camera, controls, scene, renderer;
var nodes = {
time: document.getElementById('time'),
targetsLeft: document.getElementById('targetsLeft'),
bulletsFired: document.getElementById('bulletsFired'),
bulletsHit: document.getElementById('bulletsHit')
};
var textProperty = typeof nodes.targetsLeft.innerText !== 'undefined' ? 'innerText' : 'textContent';
/* -------------- */
var bullets = [];
var targets = [];
var ballGeo = new THREE.SphereGeometry(1);
var ballMat = new THREE.MeshLambertMaterial( { color: 0xffff00 } );
var isFiring = false;
var hasStarted = true;
var targetsLeft = 10;
var bulletsFired = 0;
var bulletsHit = 0;
var ray = new THREE.ReusableRay();
var vector = new THREE.Vector3();
var projector = new THREE.Projector();
/* -------------- */
var clock = new THREE.Clock();
var lastTime;
var counter = 0;
var finished = false;
var SCREEN_HEIGHT = window.innerHeight;
var SCREEN_WIDTH = window.innerWidth;
init();
animate(+new Date());
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 25, SCREEN_WIDTH / SCREEN_HEIGHT, 50, 1e7 );
camera.position.z = 1000;
camera.lookAt(scene.position);
scene.add( camera );
controls = new THREE.FirstPersonControls( camera );
controls.movementSpeed = 0;
controls.lookSpeed = 0.1
renderer = new THREE.WebGLRenderer({ clearAlpha: 1 });
renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
container.appendChild(renderer.domElement);
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
container.appendChild( stats.domElement );
document.addEventListener( 'mousedown', function(){ isFiring = true; }, false );
document.addEventListener( 'mouseup', function(){ isFiring = false; }, false );
lastTime = +new Date();
var light = new THREE.DirectionalLight( 0xffffff, 2 );
light.position.set( 1, 1, 1 ).normalize();
scene.add( light );
var light = new THREE.DirectionalLight( 0xffffff );
light.position.set( -1, -1, -1 ).normalize();
scene.add( light );
createTargets();
}
function createTargets() {
var geometry = new THREE.CubeGeometry(20, 20, 20);
for (var i = 0; i < targetsLeft; i++) {
var object = new THREE.Mesh(geometry, new THREE.MeshLambertMaterial({ color:Math.random() * 0xffffff }));
object.position.x = Math.random() * 800 - 400;
object.position.y = Math.random() * 800 - 400;
object.position.z = Math.random() * 800 - 800;
object.rotation.x = ( Math.random() * 360 ) * Math.PI / 180;
object.rotation.y = ( Math.random() * 360 ) * Math.PI / 180;
object.rotation.z = ( Math.random() * 360 ) * Math.PI / 180;
object.scale.x = Math.random() * 2 + 1;
object.scale.y = Math.random() * 2 + 1;
object.scale.z = Math.random() * 2 + 1;
object.hitCounter = 0;
object.isHit = false;
targets.push(object);
scene.add(object);
}
}
function addBullet(){
var bullet = new THREE.Mesh( ballGeo, ballMat );
bullet.rotation.x = camera.rotation.x;
bullet.rotation.y = camera.rotation.y;
bullet.rotation.z = camera.rotation.z;
bullet.position.x = camera.position.x;
bullet.position.y = camera.position.y;
bullet.position.z = camera.position.z;
vector.set(0, 0, 0);
// no need to reset the projector
projector.unprojectVector(vector, camera);
var target = vector.subSelf(camera.position).normalize();
bullet.direction = target;
bullet._lifetime = 0;
bullets.push(bullet);
scene.add(bullet);
bulletsFired++;
}
function animate(currTime) {
var delta = currTime - lastTime;
lastTime = currTime;
if(finished) {
return;
}
requestAnimationFrame( animate );
render(delta);
stats.update();
}
function render(delta) {
controls.update( clock.getDelta() );
counter += delta;
if (counter >= INTERVAL) {
counter -= INTERVAL;
isFiring && addBullet();
}
var ballParticleHit;
var targetsNeedUpdate = false;
bullets.forEach(function(bullet, index){
ballParticleHit = false;
ray.setSource(bullet.position, bullet.direction);
var intersects = ray.intersectObjects(targets);
if(intersects.length){
intersects.some(function(hit){
if(hit.distance <= SPEED){
hit.object.isHit = true;
hit.object.hitCounter++;
var c = hit.object.material.color;
c.r += ( (1 - c.r) / 5 );
c.g += ( (1 - c.g) / 5 );
c.b += ( (1 - c.b) / 5 );
targetsNeedUpdate = true;
// bullet can't hit more than one target,
// we should leave the loop here.
ballParticleHit = true;
bulletsHit++;
return true;
} else {
// hits are ordered by distance, so we can
// leave the loop here.
return true;
}
});
}
if(ballParticleHit){
scene.remove(bullet);
delete bullets[index];
return;
}
bullet.translateZ(-SPEED);
bullet._lifetime += delta;
if(bullet._lifetime > MAX_LIFETIME){
//toRemove.push(index);
scene.remove(bullet);
delete bullets[index];
}
});
if(targetsNeedUpdate){
targets.forEach(function(target, index){
if(target.isHit){
target.isHit = false;
if(target.hitCounter >= 5){
scene.remove(target);
delete targets[index];
targetsLeft--;
}
}
});
}
nodes.time[textProperty] = clock.getElapsedTime().toFixed(2);
nodes.targetsLeft[textProperty] = targetsLeft;
nodes.bulletsFired[textProperty] = bulletsFired;
nodes.bulletsHit[textProperty] = bulletsHit;
renderer.render( scene, camera );
if(!targetsLeft){
var hitPercentage = ( bulletsHit / bulletsFired * 100 ).toFixed(0);
var timeFactor = ( 1 / clock.getElapsedTime() * 1000 ).toFixed(0);
var score = hitPercentage * timeFactor;
finished = true;
alert('Congrats, you destroyed all boxes!\n\nPrecision: ' + hitPercentage + '%\nSpeed Rating: ' + timeFactor + '\n\nScore: ' + score);
}
}
</script>
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-10931011-2']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
</body>
</html>