three-globe
Version:
Globe data visualization as a ThreeJS reusable 3D object
118 lines (98 loc) • 3.84 kB
HTML
<head>
<script type="importmap">{ "imports": {
"three": "https://esm.sh/three",
"three/addons/": "https://esm.sh/three/examples/jsm/"
}}</script>
<!-- <script type="module"> import * as THREE from 'three'; window.THREE = THREE;</script>-->
<!-- <script src="../../dist/three-globe.js" defer></script>-->
<style>
body { margin: 0; }
#time-log {
position: absolute;
font-size: 12px;
font-family: sans-serif;
padding: 5px;
border-radius: 3px;
background-color: rgba(200, 200, 200, 0.1);
color: lavender;
bottom: 10px;
right: 10px;
}
</style>
</head>
<body>
<div id="globeViz"></div>
<div id="time-log"></div>
<script type="module">
import ThreeGlobe from 'https://esm.sh/three-globe?external=three';
import * as THREE from 'https://esm.sh/three';
import { TrackballControls } from 'three/addons/controls/TrackballControls.js?external=three';
import * as satellite from 'https://esm.sh/satellite.js';
const EARTH_RADIUS_KM = 6371; // km
const SAT_SIZE = 80; // km
const TIME_STEP = 3 * 1000; // per frame
const timeLogger = document.getElementById('time-log');
const Globe = new ThreeGlobe()
.globeImageUrl('//unpkg.com/three-globe/example/img/earth-blue-marble.jpg')
.objectLat('lat')
.objectLng('lng')
.objectAltitude('alt')
.objectFacesSurface(false);
const satGeometry = new THREE.OctahedronGeometry(SAT_SIZE * Globe.getGlobeRadius() / EARTH_RADIUS_KM / 2, 0);
const satMaterial = new THREE.MeshLambertMaterial({ color: 'palegreen', transparent: true, opacity: 0.7 });
Globe.objectThreeObject(() => new THREE.Mesh(satGeometry, satMaterial));
fetch('./space-track-leo.txt').then(r => r.text()).then(rawData => {
const tleData = rawData.replace(/\r/g, '').split(/\n(?=[^12])/).map(tle => tle.split('\n'));
const satData = tleData.map(([name, ...tle]) => ({
satrec: satellite.twoline2satrec(...tle),
name: name.trim().replace(/^0 /, '')
}));
// time ticker
let time = new Date();
(function frameTicker() {
requestAnimationFrame(frameTicker);
time = new Date(+time + TIME_STEP);
timeLogger.innerText = time.toString();
// Update satellite positions
const gmst = satellite.gstime(time);
satData.forEach(d => {
const eci = satellite.propagate(d.satrec, time);
if (eci.position) {
const gdPos = satellite.eciToGeodetic(eci.position, gmst);
d.lat = satellite.radiansToDegrees(gdPos.latitude);
d.lng = satellite.radiansToDegrees(gdPos.longitude);
d.alt = gdPos.height / EARTH_RADIUS_KM
}
});
Globe.objectsData(satData);
})();
});
//
// Setup renderer
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.getElementById('globeViz').appendChild(renderer.domElement);
// Setup scene
const scene = new THREE.Scene();
scene.add(Globe);
scene.add(new THREE.AmbientLight(0xcccccc, Math.PI));
scene.add(new THREE.DirectionalLight(0xffffff, 0.6 * Math.PI));
// Setup camera
const camera = new THREE.PerspectiveCamera();
camera.aspect = window.innerWidth/window.innerHeight;
camera.updateProjectionMatrix();
camera.position.z = 400;
// Add camera controls
const tbControls = new TrackballControls(camera, renderer.domElement);
tbControls.minDistance = 101;
tbControls.rotateSpeed = 5;
tbControls.zoomSpeed = 0.8;
// Kick-off renderer
(function animate() { // IIFE
// Frame cycle
tbControls.update();
renderer.render(scene, camera);
requestAnimationFrame(animate);
})();
</script>
</body>