[av_codeblock wrapper_element=” wrapper_element_attributes=” codeblock_type=” alb_description=” id=” custom_class=” av_uid=’av-qs1g’]
[layerslider id=”1″]
var Bird = function () {
var scope = this;
THREE.Geometry.call( this );
v( 5, 0, 0 ); v( - 5, - 2, 1 ); v( - 5, 0, 0 ); v( - 5, - 2, - 1 );
v( 0, 2, - 6 ); v( 0, 2, 6 ); v( 2, 0, 0 ); v( - 3, 0, 0 );
f3( 0, 2, 1 );
f3( 4, 7, 6 ); f3( 5, 6, 7 );
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 ) );
}
}
Bird.prototype = Object.create( THREE.Geometry.prototype ); Bird.prototype.constructor = Bird;
// Based on https://www.openprocessing.org/sketch/6910
var Boid = function () {
var vector = new THREE.Vector3(), _acceleration, _width = 500, _height = 500, _depth = 200, _goal, _neighborhoodRadius = 100, _maxSpeed = 1, _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 count = 0; var velSum = new THREE.Vector3(); for ( var i = 0, il = boids.length; i < il; i++ ) { if ( Math.random() > 0.6 ) continue;
var boid = boids[ i ]; var 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 count = 0; var posSum = new THREE.Vector3(); var steer = new THREE.Vector3();
for ( var i = 0, il = boids.length; i < il; i ++ ) { if ( Math.random() > 0.6 ) continue;
var boid = boids[ i ]; var 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 posSum = new THREE.Vector3(); var repulse = new THREE.Vector3();
for ( var i = 0, il = boids.length; i < il; i ++ ) { if ( Math.random() > 0.6 ) continue;
var boid = boids[ i ]; var 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; } }
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, birds, bird;
var 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(); //scene.background = new THREE.Color( 0xffffff, 0.6 );
birds = []; boids = [];
for ( var i = 0; i < 10; 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 ); bird = birds[ i ] = new THREE.Mesh( new Bird(), new THREE.MeshBasicMaterial( { color: Math.random() *0xffffff, side: THREE.DoubleSide } ) ); bird.phase = Math.floor( Math.random() * 62.83 ); scene.add( bird ); } renderer = new THREE.CanvasRenderer({ alpha: true }); renderer.setPixelRatio( window.devicePixelRatio ); renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT ); document.addEventListener( 'mousemove', onDocumentMouseMove, false ); document.getElementById('birdsContainer').appendChild( renderer.domElement ); // window.addEventListener( 'resize', onWindowResize, false ); } function onWindowResize() { camera.aspect = window.innerWidth / window.innerHeight; camera.updateProjectionMatrix(); renderer.setSize( window.innerWidth, window.innerHeight ); } 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(); } function render() { for ( var i = 0, il = birds.length; i < il; i++ ) { boid = boids[ i ]; boid.run( boids ); bird = birds[ i ]; bird.position.copy( boids[ i ].position ); var color = bird.material.color; color.r = color.g = color.b = ( 500 - bird.position.z ) / 1000; bird.rotation.y = Math.atan2( - boid.velocity.z, boid.velocity.x ); bird.rotation.z = Math.asin( boid.velocity.y / boid.velocity.length() ); bird.phase = ( bird.phase + ( Math.max( 0, bird.rotation.z ) + 0.1 ) ) % 62.83; bird.geometry.vertices[ 5 ].y = bird.geometry.vertices[ 4 ].y = Math.sin( bird.phase ) * 5; } renderer.render( scene, camera ); }
[/av_codeblock]



