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misc_lookat.html
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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">
<style>
body {
color: #404040;
font-family:Monospace;
font-size:13px;
text-align:center;
background-color: #ffffff;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px; width: 100%;
padding: 5px;
}
a {
color: #0080bb;
}
</style>
</head>
<body>
<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - Object3D::lookAt() demo</div>
<script src="../build/three.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
var camera, scene, renderer, stats;
var sphere;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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.SphereBufferGeometry( 100, 20, 20 ), new THREE.MeshNormalMaterial() );
scene.add( sphere );
var geometry = new THREE.CylinderBufferGeometry( 0, 10, 100, 12 );
geometry.rotateX( Math.PI / 2 );
var material = new THREE.MeshNormalMaterial();
for ( var i = 0; i < 1000; i ++ ) {
var 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, false );
}
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() {
var 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 ( var 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>