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<!doctype html>
<html lang="en">
<head>
<title>Barry Martin's Hopalong Orbits Visualizer - WebVR</title>
<meta property="title" content="Barry Martin's Hopalong Orbits Visualizer - WebVR"/>
<meta property="description" content="An interactive flight through attractor orbits generated using Barry Martin's Hopalong formula."/>
<meta property="og:title" content="Barry Martin's Hopalong Orbits Visualizer - WebVR"/>
<meta property="og:image" content="http://hopalongvr.dghost.net/image.jpg"/>
<meta property="og:description" content="An interactive flight through attractor orbits generated using Barry Martin's Hopalong formula."/>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<canvas id="render-canvas"></canvas>
<style>
body {
background-color: #000000;
margin: 0px;
overflow: hidden;
font-family:Monospace;
font-size:13px;
text-align:center;
font-weight: bold;
text-align:center;
position: fixed;
height: 100%;
width: 100%;
}
a {
color:#ffffaa;
}
#render-canvas {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
}
#info {
color: #fff;
position: absolute;
top: 0px; width: 100%;
padding: 5px;
z-index: 100;
}
#about {
text-align:left;
z-index:110;
position:absolute;
top: 25px;
left: 5px;
display:none;
width: 400px;
color:#fff; background: #121212; opacity:0.8; border-radius:20px; padding: 16px
}
#aboutlink {
z-index:110;
position:absolute;
top: 5px;
left: 5px;
}
</style>
</head>
<body>
// WebGL stats tracking
<script src="//cdn.webglstats.com/stat.js" defer="defer" async="async"></script>
<script src="js/Three.js"></script>
<script src="js/ColorConverter.js"></script>
<script src="js/VRRenderer.js"></script>
<script src="js/Detector.js"></script>
<script src="js/RequestAnimationFrame.js"></script>
<script>
/*
* AUTHOR: Iacopo Sassarini
* WebVR Port: Luke Groeninger
*/
if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
var VISUALS_VISIBLE = true;
var SCALE_FACTOR = 1500;
var CAMERA_BOUND = 200;
var NUM_POINTS_SUBSET = 20000;
var NUM_SUBSETS = 7;
var NUM_POINTS = NUM_POINTS_SUBSET * NUM_SUBSETS;
var NUM_LEVELS = 10;
var LEVEL_DEPTH = 400;
var DEF_BRIGHTNESS = 1;
var DEF_SATURATION = 0.8;
var SPRITE_SIZE = Math.ceil(3 * window.innerWidth /1600);
// Orbit parameters constraints
var A_MIN = -30;
var A_MAX = 30;
var B_MIN = 0.2;
var B_MAX = 1.8;
var C_MIN = 5;
var C_MAX = 17;
var D_MIN = 0;
var D_MAX = 10;
var E_MIN = 0;
var E_MAX = 12;
// Orbit parameters
var a, b, c, d, e;
// Orbit data
var orbit = {
subsets: [],
xMin: 0,
xMax: 0,
yMin: 0,
yMax: 0,
scaleX: 0,
scaleY: 0
};
// Initialize data points
for (var i = 0; i < NUM_SUBSETS; i++){
var subsetPoints = [];
for (var j = 0; j < NUM_POINTS_SUBSET; j++){
subsetPoints[j] = {
x: 0,
y: 0,
vertex: new THREE.Vector3(0,0,0)
};
}
orbit.subsets.push(subsetPoints);
}
var container;
var camera, scene, renderer, vrrenderer, composer, hueValues = [];
var renderCanvas, vrHMD, vrHMDSensor;
var mouseX = 0, mouseY = 0;
var renderTargetWidth = window.innerWidth;
var renderTargetHeight = window.innerHeight;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var speed = 1.5;
var rotationSpeed = 0.002;
var vrSupported = false;
var vrEnabled = false;
var isFullscreen = false;
window.addEventListener("load", function() {
if (navigator.getVRDevices) {
navigator.getVRDevices().then(vrDeviceCallback);
} else if (navigator.mozGetVRDevices) {
navigator.mozGetVRDevices(vrDeviceCallback);
} else {
var div = document.getElementById('info');
div.innerHTML = div.innerHTML + "\n<br /> [H] Toggle info and cursor - [F] Enter fullscreen mode";
div.innerHTML = div.innerHTML + "\n<br />A <a href=http://webvr.info>WebVR compatible browser</a> is required for VR mode";
}
}, false);
init();
render();
function vrDeviceCallback(vrdevs) {
vrSupported = true;
for (var i = 0; i < vrdevs.length; ++i) {
if (vrdevs[i] instanceof HMDVRDevice) {
vrHMD = vrdevs[i];
break;
}
}
for (var i = 0; i < vrdevs.length; ++i) {
if (vrdevs[i] instanceof PositionSensorVRDevice &&
vrdevs[i].hardwareUnitId == vrHMD.hardwareUnitId) {
vrHMDSensor = vrdevs[i];
break;
}
}
vrrenderer = new THREE.VRRenderer(renderer, vrHMD);
var div = document.getElementById('info');
div.innerHTML = div.innerHTML + "\n<br /> [F] Enter VR Mode - [R] Reset sensor orientation";
}
function init() {
renderCanvas = document.getElementById("render-canvas");
renderer = new THREE.WebGLRenderer({
canvas: renderCanvas,
clearColor: 0x000000, clearAlpha: 1,
antialias: false,
devicePixelRatio: window.devicePixelRatio || 1,
});
// Setup renderer and effects
renderer.setSize(renderTargetWidth, renderTargetHeight );
SPRITE_SIZE = Math.ceil(3 * renderTargetWidth /1600);
sprite1 = THREE.ImageUtils.loadTexture( "galaxy.png" );
camera = new THREE.PerspectiveCamera(60, renderTargetWidth / renderTargetHeight, 1, 3 * SCALE_FACTOR );
camera.position.set( 0, 0 , SCALE_FACTOR/2);
scene = new THREE.Scene();
scene.fog = new THREE.FogExp2( 0x000000, 0.0012);
generateOrbit();
for (var s = 0; s < NUM_SUBSETS; s++){hueValues[s] = Math.random();}
// Create particle systems
for (var k = 0; k < NUM_LEVELS; k++){
for (var s = 0; s < NUM_SUBSETS; s++){
var geometry = new THREE.Geometry();
for (var i = 0; i < NUM_POINTS_SUBSET; i++){geometry.vertices.push( orbit.subsets[s][i].vertex);}
var materials = new THREE.PointCloudMaterial( { size: (SPRITE_SIZE ), map: sprite1, blending: THREE.AdditiveBlending, depthTest: false, transparent : true } );
THREE.ColorConverter.setHSV( materials.color, hueValues[s], DEF_SATURATION, DEF_BRIGHTNESS);
var particles = new THREE.PointCloud( geometry, materials );
particles.myMaterial = materials;
particles.myLevel = k;
particles.mySubset = s;
particles.position.x = 0;
particles.position.y = 0;
particles.position.z = - LEVEL_DEPTH * k - (s * LEVEL_DEPTH / NUM_SUBSETS) + SCALE_FACTOR/2;
particles.needsUpdate = 0;
scene.add( particles );
}
}
// Setup listeners
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
document.addEventListener( 'webkitfullscreenchange', onFullscreenChange, false);
document.addEventListener( 'mozfullscreenchange', onFullscreenChange, false);
window.addEventListener( 'resize', onWindowResize, false );
window.addEventListener( 'keypress', onKeyPress, false);
window.addEventListener( 'keydown', onKeyDown, false );
setInterval(updateOrbit, 7000);
}
function render() {
requestAnimationFrame(render);
if (vrEnabled && vrHMDSensor) {
// get state
var state = vrHMDSensor.getState();
// if the position is reported use it
if (state.position) {
camera.position.set(state.position.x * 50,
state.position.y * 50,
state.position.z * 50 + SCALE_FACTOR/2);
}
// if the orientation is reported use it
if (state.orientation) {
camera.quaternion.set(state.orientation.x,
state.orientation.y,
state.orientation.z,
state.orientation.w);
} else {
camera.lookAt( scene.position );
}
} else {
// move the camera position based on mouse position/taps
if (camera.position.x >= - CAMERA_BOUND && camera.position.x <= CAMERA_BOUND){
camera.position.x += ( mouseX - camera.position.x ) * 0.05;
if (camera.position.x < - CAMERA_BOUND) camera.position.x = -CAMERA_BOUND;
if (camera.position.x > CAMERA_BOUND) camera.position.x = CAMERA_BOUND;
}
if (camera.position.y >= - CAMERA_BOUND && camera.position.y <= CAMERA_BOUND){
camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
if (camera.position.y < - CAMERA_BOUND) camera.position.y = -CAMERA_BOUND;
if (camera.position.y > CAMERA_BOUND) camera.position.y = CAMERA_BOUND;
}
// look straight ahead
camera.lookAt( scene.position );
}
// update particle positions
for( i = 0; i < scene.children.length; i++ ) {
scene.children[i].position.z += speed;
scene.children[i].rotation.z += rotationSpeed;
// if the particle level has passed the fade distance
if (scene.children[i].position.z >= ((NUM_LEVELS/2) -1) * LEVEL_DEPTH + SCALE_FACTOR) {
// move the particle level back in front of the camera
scene.children[i].position.z = -((NUM_LEVELS/2) -1) * LEVEL_DEPTH;
if (scene.children[i].needsUpdate == 1){
// update the geometry and color
scene.children[i].geometry.verticesNeedUpdate = true;
THREE.ColorConverter.setHSV( scene.children[i].myMaterial.color, hueValues[scene.children[i].mySubset], DEF_SATURATION, DEF_BRIGHTNESS);
scene.children[i].needsUpdate = 0;
}
}
}
// call the proper renderer
if (vrEnabled) {
vrrenderer.render(scene, camera);
} else {
renderer.render(scene, camera);
}
}
///////////////////////////////////////////////
// Hopalong Orbit Generator
///////////////////////////////////////////////
function updateOrbit(){
generateOrbit();
for (var s = 0; s < NUM_SUBSETS; s++){
hueValues[s] = Math.random();
}
for( i = 0; i < scene.children.length; i++ ) {
scene.children[i].needsUpdate = 1;
}
}
function generateOrbit(){
var x, y, z, x1;
var idx = 0;
prepareOrbit();
// Using local vars should be faster
var al = a;
var bl = b;
var cl = c;
var dl = d;
var el = e;
var subsets = orbit.subsets;
var num_points_subset_l = NUM_POINTS_SUBSET;
var num_points_l = NUM_POINTS;
var scale_factor_l = SCALE_FACTOR;
var xMin = 0, xMax = 0, yMin = 0, yMax = 0;
for (var s = 0; s < NUM_SUBSETS; s++){
// Use a different starting point for each orbit subset
x = s * 0.005 * (0.5-Math.random());
y = s * 0.005 * (0.5-Math.random());
var curSubset = subsets[s];
for (var i = 0; i < num_points_subset_l; i++){
// Iteration formula (generalization of the Barry Martin's original one)
z = (dl + Math.sqrt(Math.abs(bl * x - cl)));
if (x > 0) {x1 = y - z;}
else if (x === 0) {x1 = y;}
else {x1 = y + z;}
y = al - x;
x = x1 + el;
curSubset[i].x = x;
curSubset[i].y = y;
if (x < xMin) {xMin = x;}
else if (x > xMax) {xMax = x;}
if (y < yMin) {yMin = y;}
else if (y > yMax) {yMax = y;}
idx++;
}
}
var scaleX = 2 * scale_factor_l / (xMax - xMin);
var scaleY = 2 * scale_factor_l / (yMax - yMin);
orbit.xMin = xMin;
orbit.xMax = xMax;
orbit.yMin = yMin;
orbit.yMax = yMax;
orbit.scaleX = scaleX;
orbit.scaleY = scaleY;
// Normalize and update vertex data
for (var s = 0; s < NUM_SUBSETS; s++){
var curSubset = subsets[s];
for (var i = 0; i < num_points_subset_l; i++){
curSubset[i].vertex.x = scaleX * (curSubset[i].x - xMin) - scale_factor_l;
curSubset[i].vertex.y = scaleY * (curSubset[i].y - yMin) - scale_factor_l;
}
}
}
function prepareOrbit(){
shuffleParams();
orbit.xMin = 0;
orbit.xMax = 0;
orbit.yMin = 0;
orbit.yMax = 0;
}
function shuffleParams() {
a = A_MIN + Math.random() * (A_MAX - A_MIN);
b = B_MIN + Math.random() * (B_MAX - B_MIN);
c = C_MIN + Math.random() * (C_MAX - C_MIN);
d = D_MIN + Math.random() * (D_MAX - D_MIN);
e = E_MIN + Math.random() * (E_MAX - E_MIN);
}
///////////////////////////////////////////////
// Event listeners
///////////////////////////////////////////////
function onDocumentMouseMove( event ) {
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
function onDocumentTouchStart( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
// launchIntoFullscreen() and exitFullscreen() from
// http://davidwalsh.name/fullscreen
// Find the right method, call on correct element
function launchIntoFullscreen(element) {
if(element.requestFullscreen) {
element.requestFullscreen();
} else if(element.mozRequestFullScreen) {
element.mozRequestFullScreen();
} else if(element.webkitRequestFullscreen) {
element.webkitRequestFullscreen();
} else if(element.msRequestFullscreen) {
element.msRequestFullscreen();
}
}
// Whack fullscreen
function exitFullscreen() {
if(document.exitFullscreen) {
document.exitFullscreen();
} else if(document.mozCancelFullScreen) {
document.mozCancelFullScreen();
} else if(document.webkitExitFullscreen) {
document.webkitExitFullscreen();
}
}
function onFullscreenChange() {
if(!document.webkitFullscreenElement && !document.mozFullScreenElement) {
isFullscreen = false;
renderCanvas.style.cursor = "";
if (vrSupported) {
vrEnabled = false;
// unhide the mouse and set the device pixel ratio correctly
renderer.devicePixelRatio = window.devicePixelRatio || 1;
}
} else {
isFullscreen = true;
renderCanvas.style.cursor = "none";
if (vrSupported) {
vrEnabled = true;
// reset the sensor on enable
vrHMDSensor.zeroSensor();
// reset the camera position
camera.position.set( 0, 0 , SCALE_FACTOR/2);
// hide the mouse, and set the device pixel ratio to 1
renderer.devicePixelRatio = 1;
}
}
// force resolution change
onWindowResize();
}
function onWindowResize( event ) {
renderTargetWidth = window.innerWidth;
renderTargetHeight = window.innerHeight;
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
// use recommended render target size if in VR
if (vrEnabled) {
if ('getRecommendedEyeRenderRect' in vrHMD) {
var leftEyeViewport = vrHMD.getRecommendedEyeRenderRect("left");
var rightEyeViewport = vrHMD.getRecommendedEyeRenderRect("right");
renderTargetWidth = leftEyeViewport.width + rightEyeViewport.width;
renderTargetHeight = Math.max(leftEyeViewport.height, rightEyeViewport.height);
}
// only scale the sprites to half the size for VR
SPRITE_SIZE = Math.ceil(3 * renderTargetWidth /3200);
} else {
SPRITE_SIZE = Math.ceil(3 * renderTargetWidth /1600);
}
// rescale sprites for new resolution
for (var i = 0; i < scene.children.length; i++){
scene.children[i].myMaterial.size = SPRITE_SIZE;
}
// update camera
camera.aspect = renderTargetWidth / renderTargetHeight;
camera.updateProjectionMatrix();
// change render target size
renderer.setSize( renderTargetWidth, renderTargetHeight );
renderer.setViewport( 0, 0, renderTargetWidth, renderTargetHeight );
}
function onKeyDown(event){
// hande up/down/left/right keys
if(event.keyCode == 38 && speed < 20) speed += 0.5;
else if(event.keyCode == 40 && speed > 0) speed -= 0.5;
else if(event.keyCode == 37) rotationSpeed += 0.001;
else if(event.keyCode == 39) rotationSpeed -= 0.001;
}
function onKeyPress(event){
// handle 'f'
if (event.which == 70 || event.which == 102) {
if (vrEnabled || isFullscreen) {
exitFullscreen();
} else if (vrSupported) {
if (renderCanvas.mozRequestFullScreen) {
renderCanvas.mozRequestFullScreen({
vrDisplay: vrHMD
});
} else if (renderCanvas.webkitRequestFullscreen) {
renderCanvas.webkitRequestFullscreen({
vrDisplay: vrHMD,
});
}
} else {
launchIntoFullscreen(renderCanvas);
}
} else if (vrEnabled && (event.which == 82 || event.which == 114)) {
// handle 'z'
vrHMDSensor.zeroSensor();
} else if(!isFullscreen && (event.which == 72 || event.which == 104)) {
// handle 'h'
toggleVisuals();
}
}
function showHideAbout() {
if (document.getElementById('about').style.display == "block") {
document.getElementById('about').style.display = "none";
} else {
document.getElementById('about').style.display = "block";
}
}
function toggleVisuals(){
if(VISUALS_VISIBLE){
document.getElementById('aboutlink').style.display = 'none';
document.getElementById('about').style.display = 'none';
document.getElementById('info').style.display = 'none';
renderCanvas.style.cursor = "none";
VISUALS_VISIBLE = false;
}
else {
document.getElementById('aboutlink').style.display = 'block';
document.getElementById('info').style.display = 'block';
renderCanvas.style.cursor = "";
VISUALS_VISIBLE = true;
}
}
</script>
<div id="info">Barry Martin's Hopalong Orbits Visualizer - Created using <a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> and <a href="https://github.com/wwwtyro/three-vr-renderer" target="_blank">vrrenderer.js</a>
<br /> [Up-Down] Control speed - [Left-Right] Control rotation
</div>
<div id="aboutlink">
<a href="javascript:showHideAbout()">About</a>
</div>
<div id="about">
<b>Barry Martin's Hopalong Orbits Visualizer</b>
<p>These orbits are generated iterating this simple algorithm:</p>
<p>(x, y) -> (y - sign(x)*sqrt(abs(b*x - c)), a -x )</p>
<p>where a, b, c are random parameters. This is known as the 'Hopalong Attractor'.</p>
<p>3D rendering done with <a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> and <a href="https://github.com/wwwtyro/three-vr-renderer" target="_blank">vrrenderer.js</a></p>
<hr>
<p><a href="http://iacopoapps.appspot.com/hopalongwebgl/">Original version</a> by <a href="https://plus.google.com/113975837825449148012?rel=author">Iacopo Sassarini</a></p>
<p><a href="https://github.com/dghost/hopalong-vr">WebVR port</a> by <a href="http://dghost.net">Luke Groeninger</a></p>
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