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+<html>
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+ <head>
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+ <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
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+ <title>three.js - geometry - birds</title>
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+ <style type="text/css">
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+ body {
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+ color: #808080;
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+ font-family:Monospace;
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+ font-size:13px;
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+ text-align:center;
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+
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+ background-color: #ffffff;
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+ margin: 0px;
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+ overflow: hidden;
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+ }
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+
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+ #info {
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+ position: absolute;
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+ top: 0px; width: 100%;
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+ padding: 5px;
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+ }
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+ </style
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+ </head>
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+ <body>
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+
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+ <div id="container"></div>
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+ <div id="info"><a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> - birds demo</div>
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+
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+ <script type="text/javascript" src="http://github.com/mrdoob/stats.js/raw/master/build/Stats.js"></script>
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+
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+ <script type="text/javascript" src="../build/Three.js"></script>
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+ <script type="text/javascript" src="geometry/Bird.js"></script>
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+
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+ <script type="text/javascript">
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+
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+ // Based on http://www.openprocessing.org/visuals/?visualID=6910
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+
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+ var Boid = function() {
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+
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+ var vector = new THREE.Vector3(),
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+ _acceleration, _width = 500, _height = 500, _depth = 200, _goal, _neighborhoodRadius = 100,
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+ _maxSpeed = 4, _maxSteerForce = 0.1, _avoidWalls = false;
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+
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+ this.position = new THREE.Vector3();
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+ this.velocity = new THREE.Vector3();
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+ _acceleration = new THREE.Vector3();
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+
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+ this.setGoal = function ( target ) {
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+
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+ _goal = target;
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+
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+ }
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+
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+ this.setAvoidWalls = function ( value ) {
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+
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+ _avoidWalls = value;
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+
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+ }
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+
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+ this.setWorldSize = function ( width, height, depth ) {
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+
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+ _width = width;
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+ _height = height;vector
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+ _depth = depth;
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+
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+ }
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+
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+ this.run = function ( boids ) {
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+
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+ if ( _avoidWalls ) {
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+
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+ vector.set( - _width, this.position.y, this.position.z );
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+ vector = this.avoid( vector );
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+ vector.multiplyScalar( 5 );
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+ _acceleration.addSelf( vector );
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+
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+ vector.set( _width, this.position.y, this.position.z );
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+ vector = this.avoid( vector );
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+ vector.multiplyScalar( 5 );
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+ _acceleration.addSelf( vector );
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+
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+ vector.set( this.position.x, - _height, this.position.z );
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+ vector = this.avoid( vector );
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+ vector.multiplyScalar( 5 );
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+ _acceleration.addSelf( vector );
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+
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+ vector.set( this.position.x, _height, this.position.z );
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+ vector = this.avoid( vector );
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+ vector.multiplyScalar( 5 );
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+ _acceleration.addSelf( vector );
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+
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+ vector.set( this.position.x, this.position.y, - _depth );
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+ vector = this.avoid( vector );
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+ vector.multiplyScalar( 5 );
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+ _acceleration.addSelf( vector );
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+
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+ vector.set( this.position.x, this.position.y, _depth );
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+ vector = this.avoid( vector );
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+ vector.multiplyScalar( 5 );
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+ _acceleration.addSelf( vector );
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+
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+ }/* else {
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+
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+ this.checkBounds();
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+
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+ }
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+ */
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+
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+ if ( Math.random() > 0.5 ) {
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+
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+ this.flock( boids );
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+
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+ }
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+
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+ this.move();
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+
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+ }
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+
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+ this.flock = function ( boids ) {
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+
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+ if ( _goal ) {
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+
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+ _acceleration.addSelf( this.reach( _goal, 0.005 ) );
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+
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+ }
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+
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+ _acceleration.addSelf( this.alignment( boids ) );
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+ _acceleration.addSelf( this.cohesion( boids ) );
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+ _acceleration.addSelf( this.separation( boids ) );
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+
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+ }
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+
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+ this.move = function () {
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+
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+ this.velocity.addSelf( _acceleration );
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+
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+ var l = this.velocity.length();
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+
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+ if ( l > _maxSpeed ) {
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+
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+ this.velocity.divideScalar( l / _maxSpeed );
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+
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+ }
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+
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+ this.position.addSelf( this.velocity );
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+ _acceleration.set( 0, 0, 0 );
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+
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+ }
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+
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+ this.checkBounds = function () {
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+
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+ if ( this.position.x > _width ) this.position.x = - _width;
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+ if ( this.position.x < - _width ) this.position.x = _width;
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+ if ( this.position.y > _height ) this.position.y = - _height;
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+ if ( this.position.y < - _height ) this.position.y = _height;
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+ if ( this.position.z > _depth ) this.position.z = - _depth;
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+ if ( this.position.z < - _depth ) this.position.z = _depth;
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+
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+ }
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+
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+ //
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+
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+ this.avoid = function ( target ) {
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+
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+ var steer = new THREE.Vector3();
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+
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+ steer.copy( this.position );
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+ steer.subSelf( target );
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+
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+ steer.multiplyScalar( 1 / this.position.distanceToSquared( target ) );
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+
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+ return steer;
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+
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+ }
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+
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+ this.repulse = function ( target ) {
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+
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+ var distance = this.position.distanceTo( target );
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+
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+ if ( distance < 150 ) {
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+
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+ var steer = new THREE.Vector3();
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+
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+ steer.sub( this.position, target );
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+ steer.multiplyScalar( 0.5 / distance );
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+
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+ _acceleration.addSelf( steer );
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+
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+ }
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+
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+ }
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+
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+ this.reach = function ( target, amount ) {
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+
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+ var steer = new THREE.Vector3();
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+
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+ steer.sub( target, this.position );
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+ steer.multiplyScalar( amount );
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+
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+ return steer;
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+
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+ }
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+
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+ this.alignment = function ( boids ) {
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+
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+ var boid, velSum = new THREE.Vector3(),
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+ count = 0;
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+
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+ for ( var i = 0, il = boids.length; i < il; i++ ) {
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+
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+ if ( Math.random() > 0.6 ) continue;
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+
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+ boid = boids[ i ];
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+
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+ distance = boid.position.distanceTo( this.position );
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+
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+ if ( distance > 0 && distance <= _neighborhoodRadius ) {
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+
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+ velSum.addSelf( boid.velocity );
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+ count++;
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+
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+ }
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+
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+ }
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+
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+ if ( count > 0 ) {
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+
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+ velSum.divideScalar( count );
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+
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+ var l = velSum.length();
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+
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+ if ( l > _maxSteerForce ) {
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+
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+ velSum.divideScalar( l / _maxSteerForce );
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+
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+ }
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+
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+ }
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+
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+ return velSum;
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+
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+ }
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+
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+ this.cohesion = function ( boids ) {
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+
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+ var boid, distance,
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+ posSum = new THREE.Vector3(),
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+ steer = new THREE.Vector3(),
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+ count = 0;
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+
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+ for ( var i = 0, il = boids.length; i < il; i ++ ) {
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+
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+ if ( Math.random() > 0.6 ) continue;
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+
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+ boid = boids[ i ];
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+ distance = boid.position.distanceTo( this.position );
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+
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+ if ( distance > 0 && distance <= _neighborhoodRadius ) {
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+
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+ posSum.addSelf( boid.position );
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+ count++;
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+
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+ }
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+
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+ }
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+
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+ if ( count > 0 ) {
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+
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+ posSum.divideScalar( count );
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+
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+ }
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+
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+ steer.sub( posSum, this.position );
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+
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+ var l = steer.length();
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+
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+ if ( l > _maxSteerForce ) {
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+
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+ steer.divideScalar( l / _maxSteerForce );
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+
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+ }
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+
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+ return steer;
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+
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+ }
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+
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+ this.separation = function ( boids ) {
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+
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+ var boid, distance,
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+ posSum = new THREE.Vector3(),
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+ repulse = new THREE.Vector3();
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+
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+ for ( var i = 0, il = boids.length; i < il; i ++ ) {
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+
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+ if ( Math.random() > 0.6 ) continue;
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+
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+ boid = boids[ i ];
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+ distance = boid.position.distanceTo( this.position );
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+
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+ if ( distance > 0 && distance <= _neighborhoodRadius ) {
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+
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+ repulse.sub( this.position, boid.position );
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+ repulse.normalize();
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+ repulse.divideScalar( distance );
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+ posSum.addSelf( repulse );
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+
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+ }
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+
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+ }
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+
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+ return posSum;
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+
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+ }
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+
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+ }
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+
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+ </script>
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+
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+ <script type="text/javascript">
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+
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+ var SCREEN_WIDTH = window.innerWidth,
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+ SCREEN_HEIGHT = window.innerHeight,
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+ SCREEN_WIDTH_HALF = SCREEN_WIDTH / 2,
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+ SCREEN_HEIGHT_HALF = SCREEN_HEIGHT / 2;
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+
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+ var camera, scene, renderer,
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+ birds, bird;
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+
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+ var boid, boids;
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+
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+ var stats;
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+
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+ init();
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+
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+ function init() {
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+
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+ camera = new THREE.Camera( 75, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );
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+ camera.position.z = 450;
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+
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+ scene = new THREE.Scene();
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+
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+ birds = [];
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+ boids = [];
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+
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+ for ( var i = 0; i < 200; i ++ ) {
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+
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+ boid = boids[ i ] = new Boid();
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+ boid.position.x = Math.random() * 400 - 200;
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+ boid.position.y = Math.random() * 400 - 200;
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+ boid.position.z = Math.random() * 400 - 200;
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+ boid.velocity.x = Math.random() * 2 - 1;
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+ boid.velocity.y = Math.random() * 2 - 1;
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+ boid.velocity.z = Math.random() * 2 - 1;
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+ boid.setAvoidWalls( true );
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+ boid.setWorldSize( 500, 500, 400 );
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+
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+ bird = birds[ i ] = new THREE.Mesh( new Bird(), new THREE.MeshColorFillMaterial( Math.random() * 0xffffff ) );
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+ bird.phase = Math.floor( Math.random() * 62.83 );
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+ bird.position = boids[ i ].position;
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+ bird.doubleSided = true;
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+ // bird.scale.x = bird.scale.y = bird.scale.z = 10;
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+ scene.addObject( bird );
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+
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+
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+ }
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+
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+ renderer = new THREE.CanvasRenderer();
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+ // renderer.autoClear = false;
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+ renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );
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+
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+ document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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+ document.body.appendChild( renderer.domElement );
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+
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+ stats = new Stats();
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+ stats.domElement.style.position = 'absolute';
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+ stats.domElement.style.left = '0px';
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+ stats.domElement.style.top = '0px';
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+
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+ document.getElementById( 'container' ).appendChild(stats.domElement);
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+
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+ setInterval( loop, 1000 / 200 );
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+
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+ }
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+
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+ function onDocumentMouseMove( event ) {
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+
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+ var vector = new THREE.Vector3( event.clientX - SCREEN_WIDTH_HALF, - event.clientY + SCREEN_HEIGHT_HALF, 0 );
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+
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+ for ( var i = 0, il = boids.length; i < il; i++ ) {
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+
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+ boid = boids[ i ];
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+
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+ vector.z = boid.position.z;
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+
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+ boid.repulse( vector );
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+
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+ }
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+
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+ }
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+
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+ function loop() {
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+
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+ for ( var i = 0, il = birds.length; i < il; i++ ) {
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+
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+ boid = boids[ i ];
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+ boid.run( boids );
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+
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+ bird = birds[ i ];
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+
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+ color = bird.material[0].color;
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+ color.r = color.g = color.b = ( 500 - bird.position.z ) / 1000;
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+ color.updateStyleString();
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+
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+ bird.rotation.y = Math.atan2( - boid.velocity.z, boid.velocity.x );
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+ bird.rotation.z = Math.asin( boid.velocity.y / boid.velocity.length() );
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+
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+ bird.phase = ( bird.phase + ( Math.max( 0, bird.rotation.z ) + 0.1 ) ) % 62.83;
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+ bird.geometry.vertices[ 5 ].position.y = bird.geometry.vertices[ 4 ].position.y = Math.sin( bird.phase ) * 5;
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+
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+ }
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+
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+ renderer.render( scene, camera );
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+
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+ stats.update();
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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