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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">
<link type="text/css" rel="stylesheet" href="main.css">
</head>
<body>
<div id="container"></div>
<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - interactive - particles</div>
<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 pointTexture;
uniform float alphaTest;
varying vec3 vColor;
void main() {
gl_FragColor = vec4( color * vColor, 1.0 );
gl_FragColor = gl_FragColor * texture2D( pointTexture, gl_PointCoord );
if ( gl_FragColor.a < alphaTest ) discard;
}
</script>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import Stats from 'three/addons/libs/stats.module.js';
import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
let renderer, scene, camera, stats;
let particles;
const PARTICLE_SIZE = 20;
let raycaster, intersects;
let pointer, INTERSECTED;
init();
animate();
function init() {
const container = document.getElementById( 'container' );
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.z = 250;
//
let boxGeometry = new THREE.BoxGeometry( 200, 200, 200, 16, 16, 16 );
// if normal and uv attributes are not removed, mergeVertices() can't consolidate indentical vertices with different normal/uv data
boxGeometry.deleteAttribute( 'normal' );
boxGeometry.deleteAttribute( 'uv' );
boxGeometry = BufferGeometryUtils.mergeVertices( boxGeometry );
//
const positionAttribute = boxGeometry.getAttribute( 'position' );
const colors = [];
const sizes = [];
const color = new THREE.Color();
for ( let i = 0, l = positionAttribute.count; i < l; i ++ ) {
color.setHSL( 0.01 + 0.1 * ( i / l ), 1.0, 0.5 );
color.toArray( colors, i * 3 );
sizes[ i ] = PARTICLE_SIZE * 0.5;
}
const geometry = new THREE.BufferGeometry();
geometry.setAttribute( 'position', positionAttribute );
geometry.setAttribute( 'customColor', new THREE.Float32BufferAttribute( colors, 3 ) );
geometry.setAttribute( 'size', new THREE.Float32BufferAttribute( sizes, 1 ) );
//
const material = new THREE.ShaderMaterial( {
uniforms: {
color: { value: new THREE.Color( 0xffffff ) },
pointTexture: { value: new THREE.TextureLoader().load( 'textures/sprites/disc.png' ) },
alphaTest: { value: 0.9 }
},
vertexShader: document.getElementById( 'vertexshader' ).textContent,
fragmentShader: document.getElementById( 'fragmentshader' ).textContent
} );
//
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();
pointer = new THREE.Vector2();
//
stats = new Stats();
container.appendChild( stats.dom );
//
window.addEventListener( 'resize', onWindowResize );
document.addEventListener( 'pointermove', onPointerMove );
}
function onPointerMove( event ) {
pointer.x = ( event.clientX / window.innerWidth ) * 2 - 1;
pointer.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;
const geometry = particles.geometry;
const attributes = geometry.attributes;
raycaster.setFromCamera( pointer, 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>