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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - interactive lines</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>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/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 container, stats;
let camera, scene, raycaster, renderer, parentTransform, sphereInter;
const pointer = new THREE.Vector2();
const radius = 100;
let theta = 0;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
const info = document.createElement( 'div' );
info.style.position = 'absolute';
info.style.top = '10px';
info.style.width = '100%';
info.style.textAlign = 'center';
info.innerHTML = '<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - interactive lines';
container.appendChild( info );
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 10000 );
scene = new THREE.Scene();
scene.background = new THREE.Color( 0xf0f0f0 );
const geometry = new THREE.SphereGeometry( 5 );
const material = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
sphereInter = new THREE.Mesh( geometry, material );
sphereInter.visible = false;
scene.add( sphereInter );
const lineGeometry = new THREE.BufferGeometry();
const points = [];
const point = new THREE.Vector3();
const direction = new THREE.Vector3();
for ( let i = 0; i < 50; i ++ ) {
direction.x += Math.random() - 0.5;
direction.y += Math.random() - 0.5;
direction.z += Math.random() - 0.5;
direction.normalize().multiplyScalar( 10 );
point.add( direction );
points.push( point.x, point.y, point.z );
}
lineGeometry.setAttribute( 'position', new THREE.Float32BufferAttribute( points, 3 ) );
parentTransform = new THREE.Object3D();
parentTransform.position.x = Math.random() * 40 - 20;
parentTransform.position.y = Math.random() * 40 - 20;
parentTransform.position.z = Math.random() * 40 - 20;
parentTransform.rotation.x = Math.random() * 2 * Math.PI;
parentTransform.rotation.y = Math.random() * 2 * Math.PI;
parentTransform.rotation.z = Math.random() * 2 * Math.PI;
parentTransform.scale.x = Math.random() + 0.5;
parentTransform.scale.y = Math.random() + 0.5;
parentTransform.scale.z = Math.random() + 0.5;
for ( let i = 0; i < 50; i ++ ) {
let object;
const lineMaterial = new THREE.LineBasicMaterial( { color: Math.random() * 0xffffff } );
if ( Math.random() > 0.5 ) {
object = new THREE.Line( lineGeometry, lineMaterial );
} else {
object = new THREE.LineSegments( lineGeometry, lineMaterial );
}
object.position.x = Math.random() * 400 - 200;
object.position.y = Math.random() * 400 - 200;
object.position.z = Math.random() * 400 - 200;
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;
parentTransform.add( object );
}
scene.add( parentTransform );
raycaster = new THREE.Raycaster();
raycaster.params.Line.threshold = 3;
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
stats = new Stats();
container.appendChild( stats.dom );
document.addEventListener( 'pointermove', 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() {
requestAnimationFrame( 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( parentTransform.children, true );
if ( intersects.length > 0 ) {
sphereInter.visible = true;
sphereInter.position.copy( intersects[ 0 ].point );
} else {
sphereInter.visible = false;
}
renderer.render( scene, camera );
}
</script>
</body>
</html>