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brannondorsey/boid.js

Created June 3, 2015 15:02
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Butterfly Habitat in Three.js
Raw
boid.js
// by Joshua Koo @BlurSpline !!! http://www.joshuakoo.com/
// http://www.lab4games.net/zz85/blog/2013/12/30/webgl-gpgpu-and-flocking-part-1/
var Boid = function() {
var vector = new THREE.Vector3(),
_acceleration, _width = 500, _height = 500, _depth = 200, _goal, _neighborhoodRadius = 100,
_maxSpeed = 4, _maxSteerForce = 0.1, _avoidWalls = false;
this.position = new THREE.Vector3();
this.velocity = new THREE.Vector3();
_acceleration = new THREE.Vector3();
this.setGoal = function ( target ) {
_goal = target;
}
this.setAvoidWalls = function ( value ) {
_avoidWalls = value;
}
this.setWorldSize = function ( width, height, depth ) {
_width = width;
_height = height;
_depth = depth;
}
this.run = function ( boids ) {
if ( _avoidWalls ) {
vector.set( - _width, this.position.y, this.position.z );
vector = this.avoid( vector );
vector.multiplyScalar( 5 );
_acceleration.add( vector );
vector.set( _width, this.position.y, this.position.z );
vector = this.avoid( vector );
vector.multiplyScalar( 5 );
_acceleration.add( vector );
vector.set( this.position.x, - _height, this.position.z );
vector = this.avoid( vector );
vector.multiplyScalar( 5 );
_acceleration.add( vector );
vector.set( this.position.x, _height, this.position.z );
vector = this.avoid( vector );
vector.multiplyScalar( 5 );
_acceleration.add( vector );
vector.set( this.position.x, this.position.y, - _depth );
vector = this.avoid( vector );
vector.multiplyScalar( 5 );
_acceleration.add( vector );
vector.set( this.position.x, this.position.y, _depth );
vector = this.avoid( vector );
vector.multiplyScalar( 5 );
_acceleration.add( vector );
}/* else {
this.checkBounds();
}
*/
if ( Math.random() > 0.5 ) {
this.flock( boids );
}
this.move();
}
this.flock = function ( boids ) {
if ( _goal ) {
_acceleration.add( this.reach( _goal, 0.005 ) );
}
_acceleration.add( this.alignment( boids ) );
_acceleration.add( this.cohesion( boids ) );
_acceleration.add( this.separation( boids ) );
}
this.move = function () {
this.velocity.add( _acceleration );
var l = this.velocity.length();
if ( l > _maxSpeed ) {
this.velocity.divideScalar( l / _maxSpeed );
}
this.position.add( this.velocity );
_acceleration.set( 0, 0, 0 );
}
this.checkBounds = function () {
if ( this.position.x > _width ) this.position.x = - _width;
if ( this.position.x < - _width ) this.position.x = _width;
if ( this.position.y > _height ) this.position.y = - _height;
if ( this.position.y < - _height ) this.position.y = _height;
if ( this.position.z > _depth ) this.position.z = - _depth;
if ( this.position.z < - _depth ) this.position.z = _depth;
}
//
this.avoid = function ( target ) {
var steer = new THREE.Vector3();
steer.copy( this.position );
steer.sub( target );
steer.multiplyScalar( 1 / this.position.distanceToSquared( target ) );
return steer;
}
this.repulse = function ( target ) {
var distance = this.position.distanceTo( target );
if ( distance < 150 ) {
var steer = new THREE.Vector3();
steer.subVectors( this.position, target );
steer.multiplyScalar( 0.5 / distance );
_acceleration.add( steer );
}
}
this.reach = function ( target, amount ) {
var steer = new THREE.Vector3();
steer.subVectors( target, this.position );
steer.multiplyScalar( amount );
return steer;
}
this.alignment = function ( boids ) {
var boid, distance, velSum = new THREE.Vector3(),
count = 0;
for ( var i = 0, il = boids.length; i < il; i++ ) {
if ( Math.random() > 0.6 ) continue;
boid = boids[ i ];
distance = boid.position.distanceTo( this.position );
if ( distance > 0 && distance <= _neighborhoodRadius ) {
velSum.add( boid.velocity );
count++;
}
}
if ( count > 0 ) {
velSum.divideScalar( count );
var l = velSum.length();
if ( l > _maxSteerForce ) {
velSum.divideScalar( l / _maxSteerForce );
}
}
return velSum;
}
this.cohesion = function ( boids ) {
var boid, distance,
posSum = new THREE.Vector3(),
steer = new THREE.Vector3(),
count = 0;
for ( var i = 0, il = boids.length; i < il; i ++ ) {
if ( Math.random() > 0.6 ) continue;
boid = boids[ i ];
distance = boid.position.distanceTo( this.position );
if ( distance > 0 && distance <= _neighborhoodRadius ) {
posSum.add( boid.position );
count++;
}
}
if ( count > 0 ) {
posSum.divideScalar( count );
}
steer.subVectors( posSum, this.position );
var l = steer.length();
if ( l > _maxSteerForce ) {
steer.divideScalar( l / _maxSteerForce );
}
return steer;
}
this.separation = function ( boids ) {
var boid, distance,
posSum = new THREE.Vector3(),
repulse = new THREE.Vector3();
for ( var i = 0, il = boids.length; i < il; i ++ ) {
if ( Math.random() > 0.6 ) continue;
boid = boids[ i ];
distance = boid.position.distanceTo( this.position );
if ( distance > 0 && distance <= _neighborhoodRadius ) {
repulse.subVectors( this.position, boid.position );
repulse.normalize();
repulse.divideScalar( distance );
posSum.add( repulse );
}
}
return posSum;
}
}
Raw
butterfly.js
var Butterfly = function () {
var scope = this;
THREE.Geometry.call( this );
v( - 3, 3, -6 );
v( 3, 3, -6 );
v( - 3, 0, 0 );
v( 3, 0, 0 );
v( - 3, 3, 6 );
v( 3, 3, 6 );
f3( 0, 1, 3 );
f3( 3, 2, 0 );
f3( 4, 2, 3 );
f3( 3, 5, 4 );
this.faceVertexUvs[ 0 ].push([
new THREE.Vector2( 0, 0 ),
new THREE.Vector2( 1, 0 ),
new THREE.Vector2( 1, .5 )
]);
this.faceVertexUvs[ 0 ].push([
new THREE.Vector2( 1, .5 ),
new THREE.Vector2( 0, .5 ),
new THREE.Vector2( 0, 0 )
]);
this.faceVertexUvs[ 0 ].push([
new THREE.Vector2( 0, 1 ),
new THREE.Vector2( 0, .5 ),
new THREE.Vector2( 1, .5 )
]);
this.faceVertexUvs[ 0 ].push([
new THREE.Vector2( 1, .5 ),
new THREE.Vector2( 1, 1 ),
new THREE.Vector2( 0, 1 )
]);
// this.computeFaceNormals();
function v( x, y, z ) {
scope.vertices.push( new THREE.Vector3( x, y, z ) );
}
function f3( a, b, c ) {
scope.faces.push( new THREE.Face3( a, b, c ) );
}
}
Butterfly.prototype = Object.create( THREE.Geometry.prototype );
Butterfly.prototype.constructor = Butterfly;
Raw
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<title> Butterfly Habitat </title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
html,body{ margin:0; padding:0; overflow: hidden;}
</style>
</head>
<body>
<div id="container"></div>
<script src="js/three.min.js"></script>
<script src="js/stats.min.js"></script>
<script src="js/boid.js"></script>
<script src="js/butterfly.js"></script>
<script>
// MAD PROPS to Joshua Koo @BlurSpline !!! http://www.joshuakoo.com/
// all the s!ck boid math is his ++ there's plenty more on his site
// + specifically on webGL + flocking here:
// http://www.lab4games.net/zz85/blog/2013/12/30/webgl-gpgpu-and-flocking-part-1/
// HABITAT -----------------------------------------------------------------------
var SCREEN_WIDTH = window.innerWidth,
SCREEN_HEIGHT = window.innerHeight,
SCREEN_WIDTH_HALF = SCREEN_WIDTH / 2,
SCREEN_HEIGHT_HALF = SCREEN_HEIGHT / 2;
var camera, scene, renderer, stats;
var butterfly, butterflies, boid, boids;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 75, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );
camera.position.z = 450;
scene = new THREE.Scene();
butterflies = [];
boids = [];
for ( var i = 0; i < 750; i ++ ) {
boid = boids[ i ] = new Boid();
boid.position.x = Math.random() * 400 - 200;
boid.position.y = Math.random() * 400 - 200;
boid.position.z = Math.random() * 400 - 200;
boid.velocity.x = Math.random() * 2 - 1;
boid.velocity.y = Math.random() * 2 - 1;
boid.velocity.z = Math.random() * 2 - 1;
boid.setAvoidWalls( true );
boid.setWorldSize( 500, 500, 400 );
var alpha = THREE.ImageUtils.loadTexture('mask'+Math.floor(Math.random()*4)+'.jpg');
var mat = new THREE.MeshBasicMaterial({
shading: THREE.FlatShading, color: Math.random()*0xffffff,
side: THREE.DoubleSide//, alphaMap:alpha, alphaTest: 0.5
});
butterfly = butterflies[ i ] = new THREE.Mesh(new Butterfly(), mat );
butterfly.phase = Math.floor( Math.random() * 62.83 );
butterfly.original = {r:butterfly.material.color.r,g:butterfly.material.color.g,b:butterfly.material.color.b}
scene.add( butterfly );
}
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setClearColor( 0xffffff );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );
renderer.autoClear = true;
// document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.body.appendChild( renderer.domElement );
//
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.left = '0px';
stats.domElement.style.top = '0px';
document.getElementById( 'container' ).appendChild(stats.domElement);
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
// make butterflies react to mouse move
// ... if we decide we want this later ...
// -----------------------------------------------
function onDocumentMouseMove( event ) {
var vector = new THREE.Vector3( event.clientX - SCREEN_WIDTH_HALF, - event.clientY + SCREEN_HEIGHT_HALF, 0 );
for ( var i = 0, il = boids.length; i < il; i++ ) {
boid = boids[ i ];
vector.z = boid.position.z;
boid.repulse( vector );
}
}
// -----------------------------------------------
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
// setInterval(animate,1000/30);
// animate();
function render() {
for ( var i = 0, il = butterflies.length; i < il; i++ ) {
boid = boids[ i ];
boid.run( boids );
butterfly = butterflies[ i ];
butterfly.position.copy( boids[ i ].position );
butterfly.geometry.verticesNeedUpdate = true;
o = butterfly.original; // custom object to keep track of original color
color = butterfly.material.color;
var shift = (400-butterfly.position.z)/1000;
color.r = (1-o.r) * shift + o.r;
color.g = (1-o.g) * shift + o.g;
color.b = (1-o.b) * shift + o.b;
butterfly.rotation.y = Math.atan2( - boid.velocity.z, boid.velocity.x );
butterfly.rotation.z = Math.asin( boid.velocity.y / boid.velocity.length() );
butterfly.phase = ( butterfly.phase + ( Math.max( 0, butterfly.rotation.z ) + 0.3 ) ) % 62.83;
butterfly.geometry.vertices[ 0 ].y = butterfly.geometry.vertices[ 1 ].y = 6 * Math.cos( butterfly.phase );
butterfly.geometry.vertices[ 5 ].y = butterfly.geometry.vertices[ 4 ].y = 6 * Math.sin( butterfly.phase );
butterfly.geometry.vertices[ 0 ].z = butterfly.geometry.vertices[ 1 ].z = 6 * Math.sin( butterfly.phase );
butterfly.geometry.vertices[ 5 ].z = butterfly.geometry.vertices[ 4 ].z = 6 * Math.cos( butterfly.phase );
}
renderer.render( scene, camera );
}
</script>
</body>
</html>
@Rcreators
Copy link

Hello,

I know this is old one but i was checking on it and its giving error on this line.

var alpha = THREE.ImageUtils.loadTexture('mask'+Math.floor(Math.random()*4)+'.jpg');

Can you provide mask files you used into project. I am trying to integrate it in custom html.

Thanks

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