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298 lines
6.7 KiB
298 lines
6.7 KiB
2 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 - custom attributes [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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<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="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - custom attributes example - particles - billboards</div>
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<div id="container"></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 ca;
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varying vec3 vColor;
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void main() {
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vColor = ca;
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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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varying vec3 vColor;
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void main() {
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vec4 color = vec4( color * vColor, 1.0 ) * texture2D( pointTexture, gl_PointCoord );
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gl_FragColor = color;
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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 sphere, length1;
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const WIDTH = window.innerWidth;
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const HEIGHT = window.innerHeight;
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init();
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animate();
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function init() {
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camera = new THREE.PerspectiveCamera( 45, WIDTH / HEIGHT, 1, 10000 );
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camera.position.z = 300;
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scene = new THREE.Scene();
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const radius = 100, segments = 68, rings = 38;
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let sphereGeometry = new THREE.SphereGeometry( radius, segments, rings );
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let boxGeometry = new THREE.BoxGeometry( 0.8 * radius, 0.8 * radius, 0.8 * radius, 10, 10, 10 );
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// if normal and uv attributes are not removed, mergeVertices() can't consolidate identical vertices with different normal/uv data
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sphereGeometry.deleteAttribute( 'normal' );
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sphereGeometry.deleteAttribute( 'uv' );
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boxGeometry.deleteAttribute( 'normal' );
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boxGeometry.deleteAttribute( 'uv' );
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sphereGeometry = BufferGeometryUtils.mergeVertices( sphereGeometry );
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boxGeometry = BufferGeometryUtils.mergeVertices( boxGeometry );
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const combinedGeometry = BufferGeometryUtils.mergeBufferGeometries( [ sphereGeometry, boxGeometry ] );
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const positionAttribute = combinedGeometry.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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const vertex = new THREE.Vector3();
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length1 = sphereGeometry.getAttribute( 'position' ).count;
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for ( let i = 0, l = positionAttribute.count; i < l; i ++ ) {
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vertex.fromBufferAttribute( positionAttribute, i );
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if ( i < length1 ) {
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color.setHSL( 0.01 + 0.1 * ( i / length1 ), 0.99, ( vertex.y + radius ) / ( 4 * radius ) );
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} else {
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color.setHSL( 0.6, 0.75, 0.25 + vertex.y / ( 2 * radius ) );
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}
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color.toArray( colors, i * 3 );
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sizes[ i ] = i < length1 ? 10 : 40;
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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( 'size', new THREE.Float32BufferAttribute( sizes, 1 ) );
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geometry.setAttribute( 'ca', new THREE.Float32BufferAttribute( colors, 3 ) );
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//
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const texture = new THREE.TextureLoader().load( 'textures/sprites/disc.png' );
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texture.wrapS = THREE.RepeatWrapping;
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texture.wrapT = THREE.RepeatWrapping;
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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: texture }
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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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transparent: true
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} );
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//
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sphere = new THREE.Points( geometry, material );
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scene.add( sphere );
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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( WIDTH, HEIGHT );
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const container = document.getElementById( 'container' );
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container.appendChild( renderer.domElement );
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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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}
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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 sortPoints() {
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const vector = new THREE.Vector3();
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// Model View Projection matrix
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const matrix = new THREE.Matrix4();
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matrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
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matrix.multiply( sphere.matrixWorld );
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//
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const geometry = sphere.geometry;
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let index = geometry.getIndex();
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const positions = geometry.getAttribute( 'position' ).array;
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const length = positions.length / 3;
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if ( index === null ) {
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const array = new Uint16Array( length );
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for ( let i = 0; i < length; i ++ ) {
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array[ i ] = i;
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}
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index = new THREE.BufferAttribute( array, 1 );
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geometry.setIndex( index );
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}
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const sortArray = [];
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for ( let i = 0; i < length; i ++ ) {
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vector.fromArray( positions, i * 3 );
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vector.applyMatrix4( matrix );
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sortArray.push( [ vector.z, i ] );
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}
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function numericalSort( a, b ) {
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return b[ 0 ] - a[ 0 ];
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}
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sortArray.sort( numericalSort );
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const indices = index.array;
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for ( let i = 0; i < length; i ++ ) {
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indices[ i ] = sortArray[ i ][ 1 ];
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}
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geometry.index.needsUpdate = true;
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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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const time = Date.now() * 0.005;
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sphere.rotation.y = 0.02 * time;
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sphere.rotation.z = 0.02 * time;
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const geometry = sphere.geometry;
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const attributes = geometry.attributes;
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for ( let i = 0; i < attributes.size.array.length; i ++ ) {
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if ( i < length1 ) {
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attributes.size.array[ i ] = 16 + 12 * Math.sin( 0.1 * i + time );
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}
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}
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attributes.size.needsUpdate = true;
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sortPoints();
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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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