Particle Waves

index.html

<!-- 

ThreeJs custom waves
Original script by ThreeJS : https://threejs.org/examples/canvas_particles_waves.html
Modified version for Cloudoru by Kevin Rajaram : http://kevinrajaram.com
Date: 08/14/2014

-->

<h1>A little something for a site I'm working on. Made with the threejs library.</h1>

particle-waves.markdown

Particle Waves

A site I'm helping out on wanted a particle wave. At first I thought of doing a background image of the animated particles but discovered threejs had these options to build one. So I borrowed some code from an already cool particle wave and customized it to created this gem!

A Pen by Kevin Rajaram on CodePen.

License.

script.js

/* 

ThreeJs custom waves
Original script by ThreeJS : https://threejs.org/examples/canvas_particles_waves.html
Modified version for Cloudoru by Kevin Rajaram : http://kevinrajaram.com
Date: 08/14/2014


*/

var SEPARATION = 40, AMOUNTX = 130, AMOUNTY = 35;

var container;
var camera, scene, renderer;
/*

if (window.WebGLRenderingContext){
	renderer = new THREE.WebGLRenderer({ alpha: true, antialias: true });
	}
else {
	renderer = new THREE.CanvasRenderer();
	}
*/

var particles, particle, count = 0;

var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;

init();
animate();

function init() {

	container = document.createElement( 'div' );
	document.body.appendChild( container );
	if(container) {
    	container.className += container.className ? ' waves' : 'waves';
	}

	camera = new THREE.PerspectiveCamera( 120, window.innerWidth / window.innerHeight, 1, 10000 );
	camera.position.y = 150; //changes how far back you can see i.e the particles towards horizon
	camera.position.z = 300; //This is how close or far the particles are seen
	
	camera.rotation.x = 0.35;
	
	scene = new THREE.Scene();

	particles = new Array();

	var PI2 = Math.PI * 2;
	var material = new THREE.SpriteCanvasMaterial( {

		color: 0x939393, //changes color of particles
		program: function ( context ) {

			context.beginPath();
			context.arc( 0, 0, 0.1, 0, PI2, true );
			context.fill();

		}

	} );

	var i = 0;

	for ( var ix = 0; ix < AMOUNTX; ix ++ ) {

		for ( var iy = 0; iy < AMOUNTY; iy ++ ) {

			particle = particles[ i ++ ] = new THREE.Sprite( material );
			particle.position.x = ix * SEPARATION - ( ( AMOUNTX * SEPARATION ) / 2 );
			particle.position.z = iy * SEPARATION - ( ( AMOUNTY * SEPARATION ) - 10 );
			scene.add( particle );

		}

	}

	renderer = new THREE.CanvasRenderer();
	renderer.setSize( window.innerWidth, window.innerHeight );
	renderer.setClearColor( 0xffffff, 1);
	container.appendChild( renderer.domElement );

	window.addEventListener( 'resize', onWindowResize, false );

}

function onWindowResize() {

	windowHalfX = window.innerWidth / 2;
	windowHalfY = window.innerHeight / 2;

	camera.aspect = window.innerWidth / window.innerHeight;
	camera.updateProjectionMatrix();

	renderer.setSize( window.innerWidth, window.innerHeight );

}

function animate() {

	requestAnimationFrame( animate );

	render();

}

function render() {

	var i = 0;

	for ( var ix = 0; ix < AMOUNTX; ix ++ ) {

		for ( var iy = 0; iy < AMOUNTY; iy ++ ) {

			particle = particles[ i++ ];
			particle.position.y = ( Math.sin( ( ix + count ) * 0.5 ) * 20 ) + ( Math.sin( ( iy + count ) * 0.5 ) * 20 );
			particle.scale.x = particle.scale.y = ( Math.sin( ( ix + count ) * 0.3 ) + 2 ) * 4 + ( Math.sin( ( iy + count ) * 0.5 ) + 1 ) * 4;

		}

	}

	renderer.render( scene, camera );

	// This increases or decreases speed
	count += 0.2;

}

scripts

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r68/three.min.js"></script>

style.css

canvas{
  position: absolute;
  top:0;
  left:0;
  z-index:-1;
}