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webgl_interactive_points.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - interactive particles</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 {
color: #ffffff;
background-color: #000000;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px;
width: 100%;
padding: 5px;
font-family: Monospace;
font-size: 13px;
text-align: center;
font-weight: bold;
}
a {
color: #fff;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - interactive - particles</div>
<script src="../build/three.js"></script>
<script src="js/WebGL.js"></script>
<script src="js/libs/stats.min.js"></script>
<script type="x-shader/x-vertex" id="vertexshader">
attribute float size;
attribute vec3 customColor;
varying vec3 vColor;
void main() {
vColor = customColor;
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_PointSize = size * ( 300.0 / -mvPosition.z );
gl_Position = projectionMatrix * mvPosition;
}
</script>
<script type="x-shader/x-fragment" id="fragmentshader">
uniform vec3 color;
uniform sampler2D texture;
varying vec3 vColor;
void main() {
gl_FragColor = vec4( color * vColor, 1.0 );
gl_FragColor = gl_FragColor * texture2D( texture, gl_PointCoord );
if ( gl_FragColor.a < ALPHATEST ) discard;
}
</script>
<script>
if ( WEBGL.isWebGLAvailable() === false ) {
document.body.appendChild( WEBGL.getWebGLErrorMessage() );
}
var renderer, scene, camera, stats;
var particles;
var PARTICLE_SIZE = 20;
var raycaster, intersects;
var mouse, INTERSECTED;
init();
animate();
function init() {
var container = document.getElementById( 'container' );
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.z = 250;
//
var vertices = new THREE.BoxGeometry( 200, 200, 200, 16, 16, 16 ).vertices;
var positions = new Float32Array( vertices.length * 3 );
var colors = new Float32Array( vertices.length * 3 );
var sizes = new Float32Array( vertices.length );
var vertex;
var color = new THREE.Color();
for ( var i = 0, l = vertices.length; i < l; i ++ ) {
vertex = vertices[ i ];
vertex.toArray( positions, i * 3 );
color.setHSL( 0.01 + 0.1 * ( i / l ), 1.0, 0.5 );
color.toArray( colors, i * 3 );
sizes[ i ] = PARTICLE_SIZE * 0.5;
}
var geometry = new THREE.BufferGeometry();
geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
geometry.addAttribute( 'customColor', new THREE.BufferAttribute( colors, 3 ) );
geometry.addAttribute( 'size', new THREE.BufferAttribute( sizes, 1 ) );
//
var material = new THREE.ShaderMaterial( {
uniforms: {
color: { value: new THREE.Color( 0xffffff ) },
texture: { value: new THREE.TextureLoader().load( "textures/sprites/disc.png" ) }
},
vertexShader: document.getElementById( 'vertexshader' ).textContent,
fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
alphaTest: 0.9
} );
//
particles = new THREE.Points( geometry, material );
scene.add( particles );
//
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
//
raycaster = new THREE.Raycaster();
mouse = new THREE.Vector2();
//
stats = new Stats();
container.appendChild( stats.dom );
//
window.addEventListener( 'resize', onWindowResize, false );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
}
function onDocumentMouseMove( event ) {
event.preventDefault();
mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
particles.rotation.x += 0.0005;
particles.rotation.y += 0.001;
var geometry = particles.geometry;
var attributes = geometry.attributes;
raycaster.setFromCamera( mouse, camera );
intersects = raycaster.intersectObject( particles );
if ( intersects.length > 0 ) {
if ( INTERSECTED != intersects[ 0 ].index ) {
attributes.size.array[ INTERSECTED ] = PARTICLE_SIZE;
INTERSECTED = intersects[ 0 ].index;
attributes.size.array[ INTERSECTED ] = PARTICLE_SIZE * 1.25;
attributes.size.needsUpdate = true;
}
} else if ( INTERSECTED !== null ) {
attributes.size.array[ INTERSECTED ] = PARTICLE_SIZE;
attributes.size.needsUpdate = true;
INTERSECTED = null;
}
renderer.render( scene, camera );
}
</script>
</body>
</html>