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webgl_interactive_cubes.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - interactive cubes</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: #f0f0f0;
color: #444;
}
a {
color: #08f;
}
</style>
</head>
<body>
<div id="info">
<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - interactive cubes
</div>
<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 stats;
let camera, scene, raycaster, renderer;
let INTERSECTED;
let theta = 0;
const pointer = new THREE.Vector2();
const radius = 5;
init();
function init() {
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.1, 100 );
scene = new THREE.Scene();
scene.background = new THREE.Color( 0xf0f0f0 );
const light = new THREE.DirectionalLight( 0xffffff, 3 );
light.position.set( 1, 1, 1 ).normalize();
scene.add( light );
const geometry = new THREE.BoxGeometry();
for ( let i = 0; i < 2000; i ++ ) {
const object = new THREE.Mesh( geometry, new THREE.MeshLambertMaterial( { color: Math.random() * 0xffffff } ) );
object.position.x = Math.random() * 40 - 20;
object.position.y = Math.random() * 40 - 20;
object.position.z = Math.random() * 40 - 20;
object.rotation.x = Math.random() * 2 * Math.PI;
object.rotation.y = Math.random() * 2 * Math.PI;
object.rotation.z = Math.random() * 2 * Math.PI;
object.scale.x = Math.random() + 0.5;
object.scale.y = Math.random() + 0.5;
object.scale.z = Math.random() + 0.5;
scene.add( object );
}
raycaster = new THREE.Raycaster();
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setAnimationLoop( animate );
document.body.appendChild( renderer.domElement );
stats = new Stats();
document.body.appendChild( stats.dom );
document.addEventListener( 'mousemove', onPointerMove );
//
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onPointerMove( event ) {
pointer.x = ( event.clientX / window.innerWidth ) * 2 - 1;
pointer.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
}
//
function animate() {
render();
stats.update();
}
function render() {
theta += 0.1;
camera.position.x = radius * Math.sin( THREE.MathUtils.degToRad( theta ) );
camera.position.y = radius * Math.sin( THREE.MathUtils.degToRad( theta ) );
camera.position.z = radius * Math.cos( THREE.MathUtils.degToRad( theta ) );
camera.lookAt( scene.position );
camera.updateMatrixWorld();
// find intersections
raycaster.setFromCamera( pointer, camera );
const intersects = raycaster.intersectObjects( scene.children, false );
if ( intersects.length > 0 ) {
if ( INTERSECTED != intersects[ 0 ].object ) {
if ( INTERSECTED ) INTERSECTED.material.emissive.setHex( INTERSECTED.currentHex );
INTERSECTED = intersects[ 0 ].object;
INTERSECTED.currentHex = INTERSECTED.material.emissive.getHex();
INTERSECTED.material.emissive.setHex( 0xff0000 );
}
} else {
if ( INTERSECTED ) INTERSECTED.material.emissive.setHex( INTERSECTED.currentHex );
INTERSECTED = null;
}
renderer.render( scene, camera );
}
</script>
</body>
</html>