<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - trails</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
background:#000;
padding:0;
margin:0;
font-weight: bold;
overflow:hidden;
}
</style>
</head>
<body>
<script src="../build/three.min.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
var container, stats;
var camera, scene, renderer;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.set( 100000, 0, 3200 );
scene = new THREE.Scene();
var colors = [ 0x000000, 0xff0080, 0x8000ff, 0xffffff ];
var geometry = new THREE.Geometry();
for ( var i = 0; i < 2000; i ++ ) {
var vertex = new THREE.Vector3();
vertex.x = Math.random() * 4000 - 2000;
vertex.y = Math.random() * 4000 - 2000;
vertex.z = Math.random() * 4000 - 2000;
geometry.vertices.push( vertex );
geometry.colors.push( new THREE.Color( colors[ Math.floor( Math.random() * colors.length ) ] ) );
}
var material = new THREE.PointCloudMaterial( { size: 1, vertexColors: THREE. VertexColors, depthTest: false, opacity: 0.5, sizeAttenuation: false, transparent: true } );
var mesh = new THREE.PointCloud( geometry, material );
scene.add( mesh );
renderer = new THREE.WebGLRenderer( { preserveDrawingBuffer: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.sortObjects = false;
renderer.autoClearColor = false;
container.appendChild( renderer.domElement );
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
stats.domElement.style.zIndex = 100;
container.appendChild( stats.domElement );
//
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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 onDocumentMouseMove(event) {
mouseX = ( event.clientX - windowHalfX ) * 10;
mouseY = ( event.clientY - windowHalfY ) * 10;
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
camera.position.x += ( mouseX - camera.position.x ) * .05;
camera.position.y += ( - mouseY - camera.position.y ) * .05;
camera.lookAt( scene.position );
renderer.render( scene, camera );
}
</script>
</body>
</html>