You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
193 lines
4.3 KiB
193 lines
4.3 KiB
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<title>three.js webgl - buffer geometry custom attributes - 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 - buffergeometry custom attributes - particles</div>
|
|
|
|
<script type="x-shader/x-vertex" id="vertexshader">
|
|
|
|
attribute float size;
|
|
|
|
varying vec3 vColor;
|
|
|
|
void main() {
|
|
|
|
vColor = color;
|
|
|
|
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 sampler2D pointTexture;
|
|
|
|
varying vec3 vColor;
|
|
|
|
void main() {
|
|
|
|
gl_FragColor = vec4( vColor, 1.0 );
|
|
|
|
gl_FragColor = gl_FragColor * texture2D( pointTexture, gl_PointCoord );
|
|
|
|
}
|
|
|
|
</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';
|
|
|
|
let renderer, scene, camera, stats;
|
|
|
|
let particleSystem, uniforms, geometry;
|
|
|
|
const particles = 100000;
|
|
|
|
init();
|
|
animate();
|
|
|
|
function init() {
|
|
|
|
camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 10000 );
|
|
camera.position.z = 300;
|
|
|
|
scene = new THREE.Scene();
|
|
|
|
uniforms = {
|
|
|
|
pointTexture: { value: new THREE.TextureLoader().load( 'textures/sprites/spark1.png' ) }
|
|
|
|
};
|
|
|
|
const shaderMaterial = new THREE.ShaderMaterial( {
|
|
|
|
uniforms: uniforms,
|
|
vertexShader: document.getElementById( 'vertexshader' ).textContent,
|
|
fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
|
|
|
|
blending: THREE.AdditiveBlending,
|
|
depthTest: false,
|
|
transparent: true,
|
|
vertexColors: true
|
|
|
|
} );
|
|
|
|
|
|
const radius = 200;
|
|
|
|
geometry = new THREE.BufferGeometry();
|
|
|
|
const positions = [];
|
|
const colors = [];
|
|
const sizes = [];
|
|
|
|
const color = new THREE.Color();
|
|
|
|
for ( let i = 0; i < particles; i ++ ) {
|
|
|
|
positions.push( ( Math.random() * 2 - 1 ) * radius );
|
|
positions.push( ( Math.random() * 2 - 1 ) * radius );
|
|
positions.push( ( Math.random() * 2 - 1 ) * radius );
|
|
|
|
color.setHSL( i / particles, 1.0, 0.5 );
|
|
|
|
colors.push( color.r, color.g, color.b );
|
|
|
|
sizes.push( 20 );
|
|
|
|
}
|
|
|
|
geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
|
|
geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
|
|
geometry.setAttribute( 'size', new THREE.Float32BufferAttribute( sizes, 1 ).setUsage( THREE.DynamicDrawUsage ) );
|
|
|
|
particleSystem = new THREE.Points( geometry, shaderMaterial );
|
|
|
|
scene.add( particleSystem );
|
|
|
|
renderer = new THREE.WebGLRenderer();
|
|
renderer.setPixelRatio( window.devicePixelRatio );
|
|
renderer.setSize( window.innerWidth, window.innerHeight );
|
|
|
|
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 animate() {
|
|
|
|
requestAnimationFrame( animate );
|
|
|
|
render();
|
|
stats.update();
|
|
|
|
}
|
|
|
|
function render() {
|
|
|
|
const time = Date.now() * 0.005;
|
|
|
|
particleSystem.rotation.z = 0.01 * time;
|
|
|
|
const sizes = geometry.attributes.size.array;
|
|
|
|
for ( let i = 0; i < particles; i ++ ) {
|
|
|
|
sizes[ i ] = 10 * ( 1 + Math.sin( 0.1 * i + time ) );
|
|
|
|
}
|
|
|
|
geometry.attributes.size.needsUpdate = true;
|
|
|
|
renderer.render( scene, camera );
|
|
|
|
}
|
|
|
|
</script>
|
|
|
|
</body>
|
|
</html>
|
|
|