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204 lines
4.3 KiB
204 lines
4.3 KiB
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - particles - billboards</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<style>
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body {
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background-color: #000000;
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margin: 0px;
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overflow: hidden;
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font-family:Monospace;
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font-size:13px;
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text-align:center;
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font-weight: bold;
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text-align:center;
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}
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a {
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color:#0078ff;
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}
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#info {
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color:#fff;
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position: absolute;
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top: 0px;
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width: 100%;
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padding: 5px;
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}
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</style>
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</head>
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<body>
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<div id="info">
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<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl particle billboards example
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</div>
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<script src="../build/three.js"></script>
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<script src="js/WebGL.js"></script>
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<script src="js/libs/stats.min.js"></script>
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<script src="js/libs/dat.gui.min.js"></script>
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<script>
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if ( WEBGL.isWebGLAvailable() === false ) {
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document.body.appendChild( WEBGL.getWebGLErrorMessage() );
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}
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var camera, scene, renderer, stats, material;
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var mouseX = 0, mouseY = 0;
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var windowHalfX = window.innerWidth / 2;
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var windowHalfY = window.innerHeight / 2;
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init();
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animate();
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function init() {
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camera = new THREE.PerspectiveCamera( 55, window.innerWidth / window.innerHeight, 2, 2000 );
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camera.position.z = 1000;
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scene = new THREE.Scene();
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scene.fog = new THREE.FogExp2( 0x000000, 0.001 );
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var geometry = new THREE.BufferGeometry();
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var vertices = [];
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var sprite = new THREE.TextureLoader().load( 'textures/sprites/disc.png' );
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for ( var i = 0; i < 10000; i ++ ) {
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var x = 2000 * Math.random() - 1000;
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var y = 2000 * Math.random() - 1000;
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var z = 2000 * Math.random() - 1000;
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vertices.push( x, y, z );
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}
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geometry.addAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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material = new THREE.PointsMaterial( { size: 35, sizeAttenuation: false, map: sprite, alphaTest: 0.5, transparent: true } );
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material.color.setHSL( 1.0, 0.3, 0.7 );
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var particles = new THREE.Points( geometry, material );
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scene.add( particles );
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//
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renderer = new THREE.WebGLRenderer();
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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//
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stats = new Stats();
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document.body.appendChild( stats.dom );
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//
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var gui = new dat.GUI();
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gui.add( material, 'sizeAttenuation' ).onChange( function () {
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material.needsUpdate = true;
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} );
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gui.open();
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//
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document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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document.addEventListener( 'touchstart', onDocumentTouchStart, false );
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document.addEventListener( 'touchmove', onDocumentTouchMove, false );
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//
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window.addEventListener( 'resize', onWindowResize, false );
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}
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function onWindowResize() {
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windowHalfX = window.innerWidth / 2;
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windowHalfY = window.innerHeight / 2;
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function onDocumentMouseMove( event ) {
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mouseX = event.clientX - windowHalfX;
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mouseY = event.clientY - windowHalfY;
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}
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function onDocumentTouchStart( event ) {
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if ( event.touches.length == 1 ) {
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event.preventDefault();
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mouseX = event.touches[ 0 ].pageX - windowHalfX;
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mouseY = event.touches[ 0 ].pageY - windowHalfY;
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}
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}
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function onDocumentTouchMove( event ) {
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if ( event.touches.length == 1 ) {
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event.preventDefault();
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mouseX = event.touches[ 0 ].pageX - windowHalfX;
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mouseY = event.touches[ 0 ].pageY - windowHalfY;
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}
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}
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//
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function animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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var time = Date.now() * 0.00005;
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camera.position.x += ( mouseX - camera.position.x ) * 0.05;
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camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
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camera.lookAt( scene.position );
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var h = ( 360 * ( 1.0 + time ) % 360 ) / 360;
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material.color.setHSL( h, 0.5, 0.5 );
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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