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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - buffergeometry - indexed</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 - indexed</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';
- import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
- let camera, scene, renderer, stats;
- let mesh;
- init();
- function init() {
- //
- camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
- camera.position.z = 64;
- scene = new THREE.Scene();
- scene.background = new THREE.Color( 0x050505 );
- //
- const light = new THREE.HemisphereLight();
- light.intensity = 3;
- scene.add( light );
- //
- const geometry = new THREE.BufferGeometry();
- const indices = [];
- const vertices = [];
- const normals = [];
- const colors = [];
- const size = 20;
- const segments = 10;
- const halfSize = size / 2;
- const segmentSize = size / segments;
- const _color = new THREE.Color();
- // generate vertices, normals and color data for a simple grid geometry
- for ( let i = 0; i <= segments; i ++ ) {
- const y = ( i * segmentSize ) - halfSize;
- for ( let j = 0; j <= segments; j ++ ) {
- const x = ( j * segmentSize ) - halfSize;
- vertices.push( x, - y, 0 );
- normals.push( 0, 0, 1 );
- const r = ( x / size ) + 0.5;
- const g = ( y / size ) + 0.5;
- _color.setRGB( r, g, 1, THREE.SRGBColorSpace );
- colors.push( _color.r, _color.g, _color.b );
- }
- }
- // generate indices (data for element array buffer)
- for ( let i = 0; i < segments; i ++ ) {
- for ( let j = 0; j < segments; j ++ ) {
- const a = i * ( segments + 1 ) + ( j + 1 );
- const b = i * ( segments + 1 ) + j;
- const c = ( i + 1 ) * ( segments + 1 ) + j;
- const d = ( i + 1 ) * ( segments + 1 ) + ( j + 1 );
- // generate two faces (triangles) per iteration
- indices.push( a, b, d ); // face one
- indices.push( b, c, d ); // face two
- }
- }
- //
- geometry.setIndex( indices );
- geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
- geometry.setAttribute( 'normal', new THREE.Float32BufferAttribute( normals, 3 ) );
- geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
- const material = new THREE.MeshPhongMaterial( {
- side: THREE.DoubleSide,
- vertexColors: 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 );
- document.body.appendChild( renderer.domElement );
- //
- stats = new Stats();
- document.body.appendChild( stats.dom );
- //
- const gui = new GUI();
- gui.add( material, 'wireframe' );
- //
- 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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