ThreeJS Background

by shanejones

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/three.js/r73/three.min.js"></script>
<script src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/175711/THREE.OrbitControls.js"></script>
<div id="three-container"></div>

CSS

#three-container {
	margin: 0;
	overflow: hidden;
	cursor: move;
  height: 100vh;
  width: 100vh;
}

JavaScript

var mContainer;
var mCamera, mRenderer;
var mControls;

var mScene;

var mParticleCount = 5000; // <-- change this number!
var mParticleSystem;

var mTime = 0.0;
var mTimeStep = (1/60);
var mDuration = 20;

window.onload = function () {
  init();
};

function init() {
  initTHREE();
  initControls();
  initParticleSystem();

  requestAnimationFrame(tick);
  window.addEventListener('resize', resize, false);
}

function initTHREE() {
  mRenderer = new THREE.WebGLRenderer({antialias: true});
  mRenderer.setSize(window.innerWidth, window.innerHeight);

  mContainer = document.getElementById('three-container');
  mContainer.appendChild(mRenderer.domElement);

  mCamera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 2500);
  //mCamera.position.set(0, 600, 600);
	mCamera.position.set(400, 800, -100);

  mScene = new THREE.Scene();

  var light;

  light = new THREE.PointLight(0xffffff, 4, 1000, 2);
  light.position.set(0, 400, 0);
  mScene.add(light);
}

function initControls() {
  mControls = new THREE.OrbitControls(mCamera, mRenderer.domElement);
}

function initParticleSystem() {
  var prefabGeometry = new THREE.PlaneGeometry(4, 4);
  var bufferGeometry = new THREE.BAS.PrefabBufferGeometry(prefabGeometry, mParticleCount);

  bufferGeometry.computeVertexNormals();

  // generate additional geometry data
  var aOffset = bufferGeometry.createAttribute('aOffset', 1);
  var aStartPosition = bufferGeometry.createAttribute('aStartPosition', 3);
  var aControlPoint1 = bufferGeometry.createAttribute('aControlPoint1', 3);
  var aControlPoint2 = bufferGeometry.createAttribute('aControlPoint2', 3);
  var aEndPosition = bufferGeometry.createAttribute('aEndPosition', 3);
  var aAxisAngle = bufferGeometry.createAttribute('aAxisAngle', 4);
  var aColor = bufferGeometry.createAttribute('color', 3);

  var i, j, offset;

  // buffer time offset
  var delay;

  for (i = 0, offset = 0; i < mParticleCount; i++) {
    delay = i / mParticleCount *...