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153 lines
3.6 KiB
153 lines
3.6 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 misc - lookAt</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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<style>
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body {
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background-color: #fff;
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color: #444;
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}
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a {
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color: #08b;
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}
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</style>
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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> - Object3D.lookAt() example</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 camera, scene, renderer, stats;
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let sphere;
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let mouseX = 0, mouseY = 0;
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let windowHalfX = window.innerWidth / 2;
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let windowHalfY = window.innerHeight / 2;
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document.addEventListener( 'mousemove', onDocumentMouseMove );
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init();
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animate();
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function init() {
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camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 15000 );
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camera.position.z = 3200;
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scene = new THREE.Scene();
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scene.background = new THREE.Color( 0xffffff );
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sphere = new THREE.Mesh( new THREE.SphereGeometry( 100, 20, 20 ), new THREE.MeshNormalMaterial() );
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scene.add( sphere );
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const geometry = new THREE.CylinderGeometry( 0, 10, 100, 12 );
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geometry.rotateX( Math.PI / 2 );
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const material = new THREE.MeshNormalMaterial();
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for ( let i = 0; i < 1000; i ++ ) {
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const mesh = new THREE.Mesh( geometry, material );
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mesh.position.x = Math.random() * 4000 - 2000;
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mesh.position.y = Math.random() * 4000 - 2000;
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mesh.position.z = Math.random() * 4000 - 2000;
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mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 4 + 2;
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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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stats = new Stats();
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document.body.appendChild( stats.dom );
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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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windowHalfX = window.innerWidth / 2;
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windowHalfY = window.innerHeight / 2;
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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 onDocumentMouseMove( event ) {
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mouseX = ( event.clientX - windowHalfX ) * 10;
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mouseY = ( event.clientY - windowHalfY ) * 10;
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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() * 0.0005;
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sphere.position.x = Math.sin( time * 0.7 ) * 2000;
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sphere.position.y = Math.cos( time * 0.5 ) * 2000;
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sphere.position.z = Math.cos( time * 0.3 ) * 2000;
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for ( let i = 1, l = scene.children.length; i < l; i ++ ) {
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scene.children[ i ].lookAt( sphere.position );
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}
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camera.position.x += ( mouseX - camera.position.x ) * .05;
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camera.position.y += ( - mouseY - camera.position.y ) * .05;
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camera.lookAt( scene.position );
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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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