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241 lines
5.4 KiB
241 lines
5.4 KiB
3 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - interactive particles</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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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="container"></div>
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<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - interactive - particles</div>
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<script type="x-shader/x-vertex" id="vertexshader">
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attribute float size;
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attribute vec3 customColor;
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varying vec3 vColor;
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void main() {
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vColor = customColor;
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vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
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gl_PointSize = size * ( 300.0 / -mvPosition.z );
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gl_Position = projectionMatrix * mvPosition;
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}
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</script>
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<script type="x-shader/x-fragment" id="fragmentshader">
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uniform vec3 color;
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uniform sampler2D pointTexture;
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uniform float alphaTest;
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varying vec3 vColor;
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void main() {
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gl_FragColor = vec4( color * vColor, 1.0 );
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gl_FragColor = gl_FragColor * texture2D( pointTexture, gl_PointCoord );
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if ( gl_FragColor.a < alphaTest ) discard;
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}
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</script>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import Stats from 'three/addons/libs/stats.module.js';
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import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
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let renderer, scene, camera, stats;
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let particles;
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const PARTICLE_SIZE = 20;
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let raycaster, intersects;
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let pointer, INTERSECTED;
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init();
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animate();
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function init() {
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const container = document.getElementById( 'container' );
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scene = new THREE.Scene();
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camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 10000 );
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camera.position.z = 250;
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//
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let boxGeometry = new THREE.BoxGeometry( 200, 200, 200, 16, 16, 16 );
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// if normal and uv attributes are not removed, mergeVertices() can't consolidate indentical vertices with different normal/uv data
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boxGeometry.deleteAttribute( 'normal' );
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boxGeometry.deleteAttribute( 'uv' );
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boxGeometry = BufferGeometryUtils.mergeVertices( boxGeometry );
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//
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const positionAttribute = boxGeometry.getAttribute( 'position' );
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const colors = [];
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const sizes = [];
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const color = new THREE.Color();
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for ( let i = 0, l = positionAttribute.count; i < l; i ++ ) {
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color.setHSL( 0.01 + 0.1 * ( i / l ), 1.0, 0.5 );
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color.toArray( colors, i * 3 );
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sizes[ i ] = PARTICLE_SIZE * 0.5;
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}
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const geometry = new THREE.BufferGeometry();
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geometry.setAttribute( 'position', positionAttribute );
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geometry.setAttribute( 'customColor', new THREE.Float32BufferAttribute( colors, 3 ) );
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geometry.setAttribute( 'size', new THREE.Float32BufferAttribute( sizes, 1 ) );
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//
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const material = new THREE.ShaderMaterial( {
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uniforms: {
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color: { value: new THREE.Color( 0xffffff ) },
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pointTexture: { value: new THREE.TextureLoader().load( 'textures/sprites/disc.png' ) },
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alphaTest: { value: 0.9 }
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},
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vertexShader: document.getElementById( 'vertexshader' ).textContent,
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fragmentShader: document.getElementById( 'fragmentshader' ).textContent
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} );
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//
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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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container.appendChild( renderer.domElement );
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//
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raycaster = new THREE.Raycaster();
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pointer = new THREE.Vector2();
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//
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stats = new Stats();
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container.appendChild( stats.dom );
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//
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window.addEventListener( 'resize', onWindowResize );
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document.addEventListener( 'pointermove', onPointerMove );
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}
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function onPointerMove( event ) {
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pointer.x = ( event.clientX / window.innerWidth ) * 2 - 1;
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pointer.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
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}
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function onWindowResize() {
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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 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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particles.rotation.x += 0.0005;
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particles.rotation.y += 0.001;
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const geometry = particles.geometry;
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const attributes = geometry.attributes;
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raycaster.setFromCamera( pointer, camera );
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intersects = raycaster.intersectObject( particles );
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if ( intersects.length > 0 ) {
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if ( INTERSECTED != intersects[ 0 ].index ) {
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attributes.size.array[ INTERSECTED ] = PARTICLE_SIZE;
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INTERSECTED = intersects[ 0 ].index;
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attributes.size.array[ INTERSECTED ] = PARTICLE_SIZE * 1.25;
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attributes.size.needsUpdate = true;
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}
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} else if ( INTERSECTED !== null ) {
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attributes.size.array[ INTERSECTED ] = PARTICLE_SIZE;
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attributes.size.needsUpdate = true;
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INTERSECTED = null;
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}
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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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