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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>
- <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();
- 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 );
- renderer.setAnimationLoop( animate );
- 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() {
- 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>
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