example/solar-terminator/index.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;
      font-family: SansSerif;
    }

    #time {
      position: absolute;
      bottom: 8px;
      left: 8px;
      color: lightblue;
    }
  </style>
</head>

<body>
  <div id="globeViz"></div>

  <div id="time"></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 solar from 'https://esm.sh/solar-calculator';

    const VELOCITY = 9; // minutes per frame

    const sunPosAt = dt => {
      const day = new Date(+dt).setUTCHours(0, 0, 0, 0);
      const t = solar.century(dt);
      const longitude = (day - dt) / 864e5 * 360 - 180;
      return [longitude - solar.equationOfTime(t) / 4, solar.declination(t)];
    };

    let dt = +new Date();
    const solarTile = { pos: sunPosAt(dt) };
    const timeEl = document.getElementById('time');

    const Globe = new ThreeGlobe()
      .globeImageUrl('//unpkg.com/three-globe/example/img/earth-dark.jpg')
      .tilesData([solarTile])
      .tileLng(d => d.pos[0])
      .tileLat(d => d.pos[1])
      .tileAltitude(0.005)
      .tileWidth(180)
      .tileHeight(180)
      .tileUseGlobeProjection(false)
      .tileMaterial(() => new THREE.MeshLambertMaterial({ color: '#ffff00', opacity: 0.3, transparent: true }))
      .tilesTransitionDuration(0);

    // animate time of day
    requestAnimationFrame(() =>
      (function animate() {
        dt += VELOCITY * 60 * 1000;
        solarTile.pos = sunPosAt(dt);
        Globe.tilesData([solarTile]);
        timeEl.textContent = new Date(dt).toLocaleString();
        requestAnimationFrame(animate);
      })()
    );

    // 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 = 500;

    // 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>