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webgl_custom_attributes_points2.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - custom attributes [particles][billboards]</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="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - custom attributes example - particles - billboards</div>
<div id="container"></div>
<script type="x-shader/x-vertex" id="vertexshader">
attribute float size;
attribute vec3 ca;
varying vec3 vColor;
void main() {
vColor = ca;
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;
varying vec3 vColor;
void main() {
vec4 color = vec4( color * vColor, 1.0 ) * texture2D( pointTexture, gl_PointCoord );
gl_FragColor = color;
}
</script>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<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 sphere, length1;
const WIDTH = window.innerWidth;
const HEIGHT = window.innerHeight;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 45, WIDTH / HEIGHT, 1, 10000 );
camera.position.z = 300;
scene = new THREE.Scene();
const radius = 100, segments = 68, rings = 38;
let sphereGeometry = new THREE.SphereGeometry( radius, segments, rings );
let boxGeometry = new THREE.BoxGeometry( 0.8 * radius, 0.8 * radius, 0.8 * radius, 10, 10, 10 );
// if normal and uv attributes are not removed, mergeVertices() can't consolidate identical vertices with different normal/uv data
sphereGeometry.deleteAttribute( 'normal' );
sphereGeometry.deleteAttribute( 'uv' );
boxGeometry.deleteAttribute( 'normal' );
boxGeometry.deleteAttribute( 'uv' );
sphereGeometry = BufferGeometryUtils.mergeVertices( sphereGeometry );
boxGeometry = BufferGeometryUtils.mergeVertices( boxGeometry );
const combinedGeometry = BufferGeometryUtils.mergeBufferGeometries( [ sphereGeometry, boxGeometry ] );
const positionAttribute = combinedGeometry.getAttribute( 'position' );
const colors = [];
const sizes = [];
const color = new THREE.Color();
const vertex = new THREE.Vector3();
length1 = sphereGeometry.getAttribute( 'position' ).count;
for ( let i = 0, l = positionAttribute.count; i < l; i ++ ) {
vertex.fromBufferAttribute( positionAttribute, i );
if ( i < length1 ) {
color.setHSL( 0.01 + 0.1 * ( i / length1 ), 0.99, ( vertex.y + radius ) / ( 4 * radius ) );
} else {
color.setHSL( 0.6, 0.75, 0.25 + vertex.y / ( 2 * radius ) );
}
color.toArray( colors, i * 3 );
sizes[ i ] = i < length1 ? 10 : 40;
}
const geometry = new THREE.BufferGeometry();
geometry.setAttribute( 'position', positionAttribute );
geometry.setAttribute( 'size', new THREE.Float32BufferAttribute( sizes, 1 ) );
geometry.setAttribute( 'ca', new THREE.Float32BufferAttribute( colors, 3 ) );
//
const texture = new THREE.TextureLoader().load( 'textures/sprites/disc.png' );
texture.wrapS = THREE.RepeatWrapping;
texture.wrapT = THREE.RepeatWrapping;
const material = new THREE.ShaderMaterial( {
uniforms: {
color: { value: new THREE.Color( 0xffffff ) },
pointTexture: { value: texture }
},
vertexShader: document.getElementById( 'vertexshader' ).textContent,
fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
transparent: true
} );
//
sphere = new THREE.Points( geometry, material );
scene.add( sphere );
//
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( WIDTH, HEIGHT );
const container = document.getElementById( 'container' );
container.appendChild( renderer.domElement );
stats = new Stats();
container.appendChild( stats.dom );
//
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function sortPoints() {
const vector = new THREE.Vector3();
// Model View Projection matrix
const matrix = new THREE.Matrix4();
matrix.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
matrix.multiply( sphere.matrixWorld );
//
const geometry = sphere.geometry;
let index = geometry.getIndex();
const positions = geometry.getAttribute( 'position' ).array;
const length = positions.length / 3;
if ( index === null ) {
const array = new Uint16Array( length );
for ( let i = 0; i < length; i ++ ) {
array[ i ] = i;
}
index = new THREE.BufferAttribute( array, 1 );
geometry.setIndex( index );
}
const sortArray = [];
for ( let i = 0; i < length; i ++ ) {
vector.fromArray( positions, i * 3 );
vector.applyMatrix4( matrix );
sortArray.push( [ vector.z, i ] );
}
function numericalSort( a, b ) {
return b[ 0 ] - a[ 0 ];
}
sortArray.sort( numericalSort );
const indices = index.array;
for ( let i = 0; i < length; i ++ ) {
indices[ i ] = sortArray[ i ][ 1 ];
}
geometry.index.needsUpdate = true;
}
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
const time = Date.now() * 0.005;
sphere.rotation.y = 0.02 * time;
sphere.rotation.z = 0.02 * time;
const geometry = sphere.geometry;
const attributes = geometry.attributes;
for ( let i = 0; i < attributes.size.array.length; i ++ ) {
if ( i < length1 ) {
attributes.size.array[ i ] = 16 + 12 * Math.sin( 0.1 * i + time );
}
}
attributes.size.needsUpdate = true;
sortPoints();
renderer.render( scene, camera );
}
</script>
</body>
</html>