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| <html lang="en"> | |
| <head> | |
| <title>three.js misc - lookAt</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"> | |
| <style> | |
| body { | |
| background-color: #fff; | |
| color: #444; | |
| } | |
| a { | |
| color: #08b; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - Object3D.lookAt() example</div> | |
| <!-- Import maps polyfill --> | |
| <!-- Remove this when import maps will be widely supported --> | |
| <script async src="https://unpkg.com/es-module-shims@1.6.3/dist/es-module-shims.js"></script> | |
| <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'; | |
| let camera, scene, renderer, stats; | |
| let sphere; | |
| let mouseX = 0, mouseY = 0; | |
| let windowHalfX = window.innerWidth / 2; | |
| let windowHalfY = window.innerHeight / 2; | |
| document.addEventListener( 'mousemove', onDocumentMouseMove ); | |
| init(); | |
| animate(); | |
| function init() { | |
| camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 15000 ); | |
| camera.position.z = 3200; | |
| scene = new THREE.Scene(); | |
| scene.background = new THREE.Color( 0xffffff ); | |
| sphere = new THREE.Mesh( new THREE.SphereGeometry( 100, 20, 20 ), new THREE.MeshNormalMaterial() ); | |
| scene.add( sphere ); | |
| const geometry = new THREE.CylinderGeometry( 0, 10, 100, 12 ); | |
| geometry.rotateX( Math.PI / 2 ); | |
| const material = new THREE.MeshNormalMaterial(); | |
| for ( let i = 0; i < 1000; i ++ ) { | |
| const mesh = new THREE.Mesh( geometry, material ); | |
| mesh.position.x = Math.random() * 4000 - 2000; | |
| mesh.position.y = Math.random() * 4000 - 2000; | |
| mesh.position.z = Math.random() * 4000 - 2000; | |
| mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 4 + 2; | |
| scene.add( mesh ); | |
| } | |
| renderer = new THREE.WebGLRenderer( { antialias: true } ); | |
| renderer.setPixelRatio( window.devicePixelRatio ); | |
| renderer.setSize( window.innerWidth, window.innerHeight ); | |
| document.body.appendChild( renderer.domElement ); | |
| stats = new Stats(); | |
| document.body.appendChild( stats.dom ); | |
| // | |
| window.addEventListener( 'resize', onWindowResize ); | |
| } | |
| function onWindowResize() { | |
| windowHalfX = window.innerWidth / 2; | |
| windowHalfY = window.innerHeight / 2; | |
| camera.aspect = window.innerWidth / window.innerHeight; | |
| camera.updateProjectionMatrix(); | |
| renderer.setSize( window.innerWidth, window.innerHeight ); | |
| } | |
| function onDocumentMouseMove( event ) { | |
| mouseX = ( event.clientX - windowHalfX ) * 10; | |
| mouseY = ( event.clientY - windowHalfY ) * 10; | |
| } | |
| // | |
| function animate() { | |
| requestAnimationFrame( animate ); | |
| render(); | |
| stats.update(); | |
| } | |
| function render() { | |
| const time = Date.now() * 0.0005; | |
| sphere.position.x = Math.sin( time * 0.7 ) * 2000; | |
| sphere.position.y = Math.cos( time * 0.5 ) * 2000; | |
| sphere.position.z = Math.cos( time * 0.3 ) * 2000; | |
| for ( let i = 1, l = scene.children.length; i < l; i ++ ) { | |
| scene.children[ i ].lookAt( sphere.position ); | |
| } | |
| camera.position.x += ( mouseX - camera.position.x ) * .05; | |
| camera.position.y += ( - mouseY - camera.position.y ) * .05; | |
| camera.lookAt( scene.position ); | |
| renderer.render( scene, camera ); | |
| } | |
| </script> | |
| </body> | |
| </html> | |