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291 lines
6.8 KiB
291 lines
6.8 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 - interactive - buffergeometry</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 - interactive - buffergeometry</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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let container, stats;
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let camera, scene, renderer;
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let raycaster, pointer;
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let mesh, line;
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init();
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animate();
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function init() {
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container = document.getElementById( 'container' );
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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 = 2750;
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scene = new THREE.Scene();
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scene.background = new THREE.Color( 0x050505 );
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scene.fog = new THREE.Fog( 0x050505, 2000, 3500 );
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//
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scene.add( new THREE.AmbientLight( 0x444444 ) );
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const light1 = new THREE.DirectionalLight( 0xffffff, 0.5 );
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light1.position.set( 1, 1, 1 );
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scene.add( light1 );
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const light2 = new THREE.DirectionalLight( 0xffffff, 1.5 );
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light2.position.set( 0, - 1, 0 );
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scene.add( light2 );
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//
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const triangles = 5000;
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let geometry = new THREE.BufferGeometry();
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const positions = new Float32Array( triangles * 3 * 3 );
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const normals = new Float32Array( triangles * 3 * 3 );
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const colors = new Float32Array( triangles * 3 * 3 );
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const color = new THREE.Color();
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const n = 800, n2 = n / 2; // triangles spread in the cube
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const d = 120, d2 = d / 2; // individual triangle size
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const pA = new THREE.Vector3();
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const pB = new THREE.Vector3();
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const pC = new THREE.Vector3();
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const cb = new THREE.Vector3();
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const ab = new THREE.Vector3();
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for ( let i = 0; i < positions.length; i += 9 ) {
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// positions
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const x = Math.random() * n - n2;
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const y = Math.random() * n - n2;
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const z = Math.random() * n - n2;
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const ax = x + Math.random() * d - d2;
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const ay = y + Math.random() * d - d2;
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const az = z + Math.random() * d - d2;
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const bx = x + Math.random() * d - d2;
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const by = y + Math.random() * d - d2;
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const bz = z + Math.random() * d - d2;
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const cx = x + Math.random() * d - d2;
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const cy = y + Math.random() * d - d2;
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const cz = z + Math.random() * d - d2;
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positions[ i ] = ax;
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positions[ i + 1 ] = ay;
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positions[ i + 2 ] = az;
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positions[ i + 3 ] = bx;
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positions[ i + 4 ] = by;
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positions[ i + 5 ] = bz;
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positions[ i + 6 ] = cx;
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positions[ i + 7 ] = cy;
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positions[ i + 8 ] = cz;
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// flat face normals
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pA.set( ax, ay, az );
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pB.set( bx, by, bz );
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pC.set( cx, cy, cz );
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cb.subVectors( pC, pB );
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ab.subVectors( pA, pB );
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cb.cross( ab );
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cb.normalize();
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const nx = cb.x;
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const ny = cb.y;
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const nz = cb.z;
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normals[ i ] = nx;
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normals[ i + 1 ] = ny;
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normals[ i + 2 ] = nz;
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normals[ i + 3 ] = nx;
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normals[ i + 4 ] = ny;
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normals[ i + 5 ] = nz;
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normals[ i + 6 ] = nx;
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normals[ i + 7 ] = ny;
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normals[ i + 8 ] = nz;
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// colors
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const vx = ( x / n ) + 0.5;
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const vy = ( y / n ) + 0.5;
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const vz = ( z / n ) + 0.5;
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color.setRGB( vx, vy, vz );
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colors[ i ] = color.r;
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colors[ i + 1 ] = color.g;
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colors[ i + 2 ] = color.b;
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colors[ i + 3 ] = color.r;
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colors[ i + 4 ] = color.g;
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colors[ i + 5 ] = color.b;
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colors[ i + 6 ] = color.r;
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colors[ i + 7 ] = color.g;
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colors[ i + 8 ] = color.b;
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}
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geometry.setAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
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geometry.setAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );
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geometry.setAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );
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geometry.computeBoundingSphere();
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let material = new THREE.MeshPhongMaterial( {
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color: 0xaaaaaa, specular: 0xffffff, shininess: 250,
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side: THREE.DoubleSide, 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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raycaster = new THREE.Raycaster();
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pointer = new THREE.Vector2();
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geometry = new THREE.BufferGeometry();
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geometry.setAttribute( 'position', new THREE.BufferAttribute( new Float32Array( 4 * 3 ), 3 ) );
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material = new THREE.LineBasicMaterial( { color: 0xffffff, transparent: true } );
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line = new THREE.Line( geometry, material );
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scene.add( line );
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//
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renderer = new THREE.WebGLRenderer();
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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container.appendChild( renderer.domElement );
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//
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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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document.addEventListener( 'pointermove', onPointerMove );
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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 onPointerMove( event ) {
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pointer.x = ( event.clientX / window.innerWidth ) * 2 - 1;
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pointer.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
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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 * 0.15;
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mesh.rotation.y = time * 0.25;
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raycaster.setFromCamera( pointer, camera );
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const intersects = raycaster.intersectObject( mesh );
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if ( intersects.length > 0 ) {
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const intersect = intersects[ 0 ];
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const face = intersect.face;
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const linePosition = line.geometry.attributes.position;
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const meshPosition = mesh.geometry.attributes.position;
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linePosition.copyAt( 0, meshPosition, face.a );
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linePosition.copyAt( 1, meshPosition, face.b );
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linePosition.copyAt( 2, meshPosition, face.c );
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linePosition.copyAt( 3, meshPosition, face.a );
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mesh.updateMatrix();
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line.geometry.applyMatrix4( mesh.matrix );
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line.visible = true;
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} else {
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line.visible = false;
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}
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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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