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<title>three.js misc - lookAt</title>
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<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@1.8.0/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>
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