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173 lines
4.2 KiB
173 lines
4.2 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 - convex geometry</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="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - convex geometry</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 { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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import { ConvexGeometry } from 'three/addons/geometries/ConvexGeometry.js';
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import * as BufferGeometryUtils from 'three/addons/utils/BufferGeometryUtils.js';
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let group, camera, scene, renderer;
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init();
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animate();
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function init() {
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scene = new THREE.Scene();
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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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// camera
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camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
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camera.position.set( 15, 20, 30 );
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scene.add( camera );
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// controls
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const controls = new OrbitControls( camera, renderer.domElement );
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controls.minDistance = 20;
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controls.maxDistance = 50;
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controls.maxPolarAngle = Math.PI / 2;
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// ambient light
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scene.add( new THREE.AmbientLight( 0x222222 ) );
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// point light
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const light = new THREE.PointLight( 0xffffff, 1 );
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camera.add( light );
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// helper
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scene.add( new THREE.AxesHelper( 20 ) );
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// textures
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const loader = new THREE.TextureLoader();
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const texture = loader.load( 'textures/sprites/disc.png' );
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group = new THREE.Group();
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scene.add( group );
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// points
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let dodecahedronGeometry = new THREE.DodecahedronGeometry( 10 );
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// if normal and uv attributes are not removed, mergeVertices() can't consolidate indentical vertices with different normal/uv data
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dodecahedronGeometry.deleteAttribute( 'normal' );
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dodecahedronGeometry.deleteAttribute( 'uv' );
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dodecahedronGeometry = BufferGeometryUtils.mergeVertices( dodecahedronGeometry );
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const vertices = [];
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const positionAttribute = dodecahedronGeometry.getAttribute( 'position' );
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for ( let i = 0; i < positionAttribute.count; i ++ ) {
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const vertex = new THREE.Vector3();
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vertex.fromBufferAttribute( positionAttribute, i );
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vertices.push( vertex );
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}
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const pointsMaterial = new THREE.PointsMaterial( {
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color: 0x0080ff,
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map: texture,
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size: 1,
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alphaTest: 0.5
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} );
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const pointsGeometry = new THREE.BufferGeometry().setFromPoints( vertices );
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const points = new THREE.Points( pointsGeometry, pointsMaterial );
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group.add( points );
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// convex hull
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const meshMaterial = new THREE.MeshLambertMaterial( {
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color: 0xffffff,
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opacity: 0.5,
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transparent: true
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} );
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const meshGeometry = new ConvexGeometry( vertices );
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const mesh1 = new THREE.Mesh( meshGeometry, meshMaterial );
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mesh1.material.side = THREE.BackSide; // back faces
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mesh1.renderOrder = 0;
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group.add( mesh1 );
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const mesh2 = new THREE.Mesh( meshGeometry, meshMaterial.clone() );
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mesh2.material.side = THREE.FrontSide; // front faces
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mesh2.renderOrder = 1;
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group.add( mesh2 );
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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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function animate() {
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requestAnimationFrame( animate );
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group.rotation.y += 0.005;
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render();
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}
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function render() {
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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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