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120 lines
2.9 KiB
120 lines
2.9 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 - trails</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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<!-- 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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let stats;
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let camera, scene, renderer, clock;
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init();
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animate();
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function init() {
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const container = document.createElement( 'div' );
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document.body.appendChild( container );
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camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 10 );
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camera.position.set( 0, 0, 1 );
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clock = new THREE.Clock();
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scene = new THREE.Scene();
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const colorArray = [ new THREE.Color( 0xff0080 ), new THREE.Color( 0xffffff ), new THREE.Color( 0x8000ff ) ];
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const positions = [];
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const colors = [];
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for ( let i = 0; i < 100; i ++ ) {
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positions.push( Math.random() - 0.5, Math.random() - 0.5, Math.random() - 0.5 );
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const clr = colorArray[ Math.floor( Math.random() * colorArray.length ) ];
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colors.push( clr.r, clr.g, clr.b );
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}
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const geometry = new THREE.BufferGeometry();
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geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
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geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
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const material = new THREE.PointsMaterial( { size: 4, vertexColors: true, depthTest: false, sizeAttenuation: false } );
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const mesh = new THREE.Points( geometry, material );
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scene.add( mesh );
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renderer = new THREE.WebGLRenderer( { preserveDrawingBuffer: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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renderer.autoClearColor = false;
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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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//
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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 elapsedTime = clock.getElapsedTime();
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scene.rotation.y = elapsedTime * 0.5;
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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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