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webgl_buffergeometry_points.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - buffergeometry - 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 - particles</div>
<script type="module">
import * as THREE from '../build/three.module.js';
import Stats from './jsm/libs/stats.module.js';
var container, stats;
var camera, scene, renderer;
var points;
init();
animate();
function init() {
container = document.getElementById( 'container' );
//
camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 5, 3500 );
camera.position.z = 2750;
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x050505 );
scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
//
var particles = 500000;
var geometry = new THREE.BufferGeometry();
var positions = [];
var colors = [];
var color = new THREE.Color();
var n = 1000, n2 = n / 2; // particles spread in the cube
for ( var i = 0; i < particles; i ++ ) {
// positions
var x = Math.random() * n - n2;
var y = Math.random() * n - n2;
var z = Math.random() * n - n2;
positions.push( x, y, z );
// colors
var vx = ( x / n ) + 0.5;
var vy = ( y / n ) + 0.5;
var vz = ( z / n ) + 0.5;
color.setRGB( vx, vy, vz );
colors.push( color.r, color.g, color.b );
}
geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
geometry.computeBoundingSphere();
//
var material = new THREE.PointsMaterial( { size: 15, vertexColors: true } );
points = new THREE.Points( geometry, material );
scene.add( points );
//
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
//
stats = new Stats();
container.appendChild( stats.dom );
//
window.addEventListener( 'resize', onWindowResize, false );
}
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() {
var time = Date.now() * 0.001;
points.rotation.x = time * 0.25;
points.rotation.y = time * 0.5;
renderer.render( scene, camera );
}
</script>
</body>
</html>