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187 lines
4.0 KiB
187 lines
4.0 KiB
2 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 - buffergeometry - indexed</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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<div id="container"></div>
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<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - buffergeometry - indexed</div>
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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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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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let camera, scene, renderer, stats;
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let mesh;
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init();
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animate();
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function init() {
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//
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camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 3500 );
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camera.position.z = 64;
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scene = new THREE.Scene();
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scene.background = new THREE.Color( 0x050505 );
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//
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const light = new THREE.HemisphereLight();
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scene.add( light );
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//
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const geometry = new THREE.BufferGeometry();
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const indices = [];
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const vertices = [];
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const normals = [];
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const colors = [];
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const size = 20;
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const segments = 10;
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const halfSize = size / 2;
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const segmentSize = size / segments;
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// generate vertices, normals and color data for a simple grid geometry
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for ( let i = 0; i <= segments; i ++ ) {
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const y = ( i * segmentSize ) - halfSize;
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for ( let j = 0; j <= segments; j ++ ) {
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const x = ( j * segmentSize ) - halfSize;
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vertices.push( x, - y, 0 );
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normals.push( 0, 0, 1 );
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const r = ( x / size ) + 0.5;
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const g = ( y / size ) + 0.5;
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colors.push( r, g, 1 );
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}
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}
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// generate indices (data for element array buffer)
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for ( let i = 0; i < segments; i ++ ) {
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for ( let j = 0; j < segments; j ++ ) {
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const a = i * ( segments + 1 ) + ( j + 1 );
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const b = i * ( segments + 1 ) + j;
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const c = ( i + 1 ) * ( segments + 1 ) + j;
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const d = ( i + 1 ) * ( segments + 1 ) + ( j + 1 );
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// generate two faces (triangles) per iteration
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indices.push( a, b, d ); // face one
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indices.push( b, c, d ); // face two
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}
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}
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//
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geometry.setIndex( indices );
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geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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geometry.setAttribute( 'normal', new THREE.Float32BufferAttribute( normals, 3 ) );
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geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
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const material = new THREE.MeshPhongMaterial( {
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side: THREE.DoubleSide,
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vertexColors: true
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} );
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mesh = new THREE.Mesh( geometry, material );
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scene.add( mesh );
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//
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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//
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stats = new Stats();
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document.body.appendChild( stats.dom );
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//
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const gui = new GUI();
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gui.add( material, 'wireframe' );
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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 time = Date.now() * 0.001;
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mesh.rotation.x = time * 0.25;
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mesh.rotation.y = time * 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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