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171 lines
3.9 KiB
171 lines
3.9 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 - instancing - raycast</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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<!-- 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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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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let camera, scene, renderer, controls, stats;
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let mesh;
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const amount = parseInt( window.location.search.slice( 1 ) ) || 10;
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const count = Math.pow( amount, 3 );
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const raycaster = new THREE.Raycaster();
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const mouse = new THREE.Vector2( 1, 1 );
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const color = new THREE.Color();
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const white = new THREE.Color().setHex( 0xffffff );
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init();
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animate();
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function init() {
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camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
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camera.position.set( amount, amount, amount );
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camera.lookAt( 0, 0, 0 );
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scene = new THREE.Scene();
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const light = new THREE.HemisphereLight( 0xffffff, 0x888888 );
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light.position.set( 0, 1, 0 );
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scene.add( light );
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const geometry = new THREE.IcosahedronGeometry( 0.5, 3 );
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const material = new THREE.MeshPhongMaterial( { color: 0xffffff } );
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mesh = new THREE.InstancedMesh( geometry, material, count );
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let i = 0;
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const offset = ( amount - 1 ) / 2;
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const matrix = new THREE.Matrix4();
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for ( let x = 0; x < amount; x ++ ) {
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for ( let y = 0; y < amount; y ++ ) {
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for ( let z = 0; z < amount; z ++ ) {
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matrix.setPosition( offset - x, offset - y, offset - z );
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mesh.setMatrixAt( i, matrix );
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mesh.setColorAt( i, color );
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i ++;
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}
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}
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}
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scene.add( mesh );
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//
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const gui = new GUI();
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gui.add( mesh, 'count', 0, count );
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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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controls = new OrbitControls( camera, renderer.domElement );
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controls.enableDamping = true;
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controls.enableZoom = false;
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controls.enablePan = false;
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stats = new Stats();
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document.body.appendChild( stats.dom );
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window.addEventListener( 'resize', onWindowResize );
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document.addEventListener( 'mousemove', onMouseMove );
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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 onMouseMove( event ) {
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event.preventDefault();
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mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
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mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
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}
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function animate() {
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requestAnimationFrame( animate );
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controls.update();
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raycaster.setFromCamera( mouse, camera );
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const intersection = raycaster.intersectObject( mesh );
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if ( intersection.length > 0 ) {
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const instanceId = intersection[ 0 ].instanceId;
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mesh.getColorAt( instanceId, color );
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if ( color.equals( white ) ) {
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mesh.setColorAt( instanceId, color.setHex( Math.random() * 0xffffff ) );
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mesh.instanceColor.needsUpdate = true;
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}
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}
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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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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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