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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - buffergeometry</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</div>
- <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 container, stats;
- let camera, scene, renderer;
- let mesh;
- init();
- animate();
- function init() {
- container = document.getElementById( 'container' );
- //
- camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
- camera.position.z = 2750;
- scene = new THREE.Scene();
- scene.background = new THREE.Color( 0x050505 );
- scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
- //
- scene.add( new THREE.AmbientLight( 0xcccccc ) );
- const light1 = new THREE.DirectionalLight( 0xffffff, 1.5 );
- light1.position.set( 1, 1, 1 );
- scene.add( light1 );
- const light2 = new THREE.DirectionalLight( 0xffffff, 4.5 );
- light2.position.set( 0, - 1, 0 );
- scene.add( light2 );
- //
- const triangles = 160000;
- const geometry = new THREE.BufferGeometry();
- const positions = [];
- const normals = [];
- const colors = [];
- const color = new THREE.Color();
- const n = 800, n2 = n / 2; // triangles spread in the cube
- const d = 12, d2 = d / 2; // individual triangle size
- const pA = new THREE.Vector3();
- const pB = new THREE.Vector3();
- const pC = new THREE.Vector3();
- const cb = new THREE.Vector3();
- const ab = new THREE.Vector3();
- for ( let i = 0; i < triangles; i ++ ) {
- // positions
- const x = Math.random() * n - n2;
- const y = Math.random() * n - n2;
- const z = Math.random() * n - n2;
- const ax = x + Math.random() * d - d2;
- const ay = y + Math.random() * d - d2;
- const az = z + Math.random() * d - d2;
- const bx = x + Math.random() * d - d2;
- const by = y + Math.random() * d - d2;
- const bz = z + Math.random() * d - d2;
- const cx = x + Math.random() * d - d2;
- const cy = y + Math.random() * d - d2;
- const cz = z + Math.random() * d - d2;
- positions.push( ax, ay, az );
- positions.push( bx, by, bz );
- positions.push( cx, cy, cz );
- // flat face normals
- pA.set( ax, ay, az );
- pB.set( bx, by, bz );
- pC.set( cx, cy, cz );
- cb.subVectors( pC, pB );
- ab.subVectors( pA, pB );
- cb.cross( ab );
- cb.normalize();
- const nx = cb.x;
- const ny = cb.y;
- const nz = cb.z;
- normals.push( nx, ny, nz );
- normals.push( nx, ny, nz );
- normals.push( nx, ny, nz );
- // colors
- const vx = ( x / n ) + 0.5;
- const vy = ( y / n ) + 0.5;
- const vz = ( z / n ) + 0.5;
- color.setRGB( vx, vy, vz );
- const alpha = Math.random();
- colors.push( color.r, color.g, color.b, alpha );
- colors.push( color.r, color.g, color.b, alpha );
- colors.push( color.r, color.g, color.b, alpha );
- }
- function disposeArray() {
- this.array = null;
- }
- geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ).onUpload( disposeArray ) );
- geometry.setAttribute( 'normal', new THREE.Float32BufferAttribute( normals, 3 ).onUpload( disposeArray ) );
- geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 4 ).onUpload( disposeArray ) );
- geometry.computeBoundingSphere();
- const material = new THREE.MeshPhongMaterial( {
- color: 0xd5d5d5, specular: 0xffffff, shininess: 250,
- side: THREE.DoubleSide, vertexColors: true, transparent: true
- } );
- mesh = new THREE.Mesh( geometry, material );
- scene.add( mesh );
- //
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- 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() {
- const time = Date.now() * 0.001;
- mesh.rotation.x = time * 0.25;
- mesh.rotation.y = time * 0.5;
- renderer.render( scene, camera );
- stats.update();
- }
- </script>
- </body>
- </html>
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