javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<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/[email protected]/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>