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Dot-Matrix Visitor Globe

A three.js dot globe: visitor counts as red beams, blue arcs with moving sparks to one destination; drag it, click a beam for the number.

html · css · three.jsMITAdded 2026-10-14#3D #globe #data visualization #map

Live demoOpen in a new tab ↗

What makes it work

Dotted land: 52,000 points are scattered evenly over the sphere along a Fibonacci spiral, and only those that land on land are kept (about 15,000), all drawn at once by one Points. The land data is a 0.5° bitmap that only says “where is land”; no borders are drawn.
Dots fade toward the edge: the point shader computes whether each point faces the camera, and the closer to the sphere’s edge, the more transparent it gets, so the globe looks volumetric; back-side points are hidden by a slightly smaller opaque sphere.
Beams: all countries share one InstancedMesh; each beam is the same unit cylinder, placed by the country’s position, orientation and height. Height is the square root of the visitor count so small countries are still visible; beams grow out of the ground.
Arcs + flowing sparks: each arc is a quadratic Bézier tube whose control point sits above the great-circle midpoint, so farther routes arch higher. All arcs are merged into one geometry, and the sparks are computed in the fragment shader from t and time, with no per-frame vertex updates.
Follows the theme: colors are all read from CSS variables and re-read when switching between light and dark; on a light background the arcs use normal blending (additive light is invisible on paper color).
Power saving: the render loop stops when the globe is out of the viewport and nothing is moving; with reduced motion preferred, there is no auto-rotation, no flow, and beams go straight to full height.

How to use it

Copy the .stage structure, styles and <script type="module"> from index.html, and put geo.js in the same directory (loaded with a plain <script>, so it also opens from file://).
Replace the example VISITORS (two-letter ISO country code → visitor count) with real numbers from your analytics, and set HOME to the latitude and longitude of the city the arcs fly to.
For finer or coarser land: download the land GeoJSON from Natural Earth, run node build-land.mjs ne_50m_land.geojson, and paste the output into land in geo.js.
If the first screen matters a lot, wait for the user’s first scroll or mouse move before you import three.js and build the globe, and show a static image first.

Pitfalls

The geographic data comes from Natural Earth (public domain): the land bitmap is generated from the 1:50m land polygons, and the country points are the label points (LABEL_X / LABEL_Y) of the 1:50m countries layer. Borders are deliberately not drawn, so the map takes no position on border disputes.
AdditiveBlending is almost invisible on a light background, so the blending mode must switch with the theme, and needsUpdate must be set to true.
Countries closer than 4° to the destination get no arc, otherwise the arc shrinks to a point and also pokes into the ground.
On phones the canvas needs touch-action: pan-y, otherwise vertical swipes are eaten by the globe and the page can’t scroll.
Don’t pop up a tooltip while dragging; distinguish “a tap” from “a drag” (here a movement under 6px counts as a click).

$For agents: index.md

Source MIT licensed. Take it.

<!doctype html>
<html lang="zh-CN">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>点阵地球访客地图</title>
    <style>
      :root {
        --paper: #fbf8f1;
        --paper-2: #f3eee2;
        --card: #fffdf8;
        --ink: #1c2230;
        --ink-2: #4a5163;
        --ink-3: #636877;
        --line: #e6dfd0;
        --dot: #d8d0bf;
        --blue: #2f5bd3;
        --blue-soft: #e8eefc;
        --seal: #c0391f;
        --hi: #ffe066;
        --shadow: 0 1px 0 rgba(28, 34, 48, 0.04), 0 10px 28px -14px rgba(28, 34, 48, 0.28);
        --f-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
        --f-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
        color-scheme: light;
      }
      @media (prefers-color-scheme: dark) {
        :root {
          --paper: #14161b;
          --paper-2: #1c1f26;
          --card: #1e2129;
          --ink: #ece7dc;
          --ink-2: #bab6ac;
          --ink-3: #959aa8;
          --line: #31353f;
          --dot: #2c3039;
          --blue: #8eaaff;
          --blue-soft: #1f2a47;
          --seal: #f0694e;
          --hi: #7d6416;
          --shadow: 0 1px 0 rgba(0, 0, 0, 0.25), 0 10px 28px -14px rgba(0, 0, 0, 0.8);
          color-scheme: dark;
        }
      }
      * {
        box-sizing: border-box;
      }
      body {
        margin: 0;
        min-height: 100vh;
        background: var(--paper) radial-gradient(var(--dot) 1px, transparent 1.2px) 0 0 / 22px 22px;
        color: var(--ink);
        font: 16px/1.7 var(--f-sans);
      }
      main {
        max-width: 1120px;
        margin: 0 auto;
        padding: 28px 24px 40px;
      }
      .kicker {
        margin: 0;
        font: 500 12px/1.6 var(--f-mono);
        letter-spacing: 0.08em;
        color: var(--seal);
      }
      h1 {
        margin: 2px 0 4px;
        font-size: 28px;
        line-height: 1.3;
      }
      .hint {
        margin: 0 0 18px;
        font-size: 14.5px;
        color: var(--ink-2);
      }

      /* ---------- globe + ranked list ---------- */
      .grid {
        display: grid;
        grid-template-columns: minmax(0, 1fr) 300px;
        gap: 24px;
        align-items: start;
      }
      .stage {
        position: relative;
        height: clamp(340px, calc(100vh - 170px), 640px);
        background: var(--card);
        border: 1px solid var(--line);
        border-radius: 14px;
        box-shadow: var(--shadow);
        overflow: hidden;
      }
      .stage canvas {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
        cursor: grab;
        touch-action: pan-y; /* a vertical swipe still scrolls the page on a phone */
      }
      .stage canvas:active {
        cursor: grabbing;
      }
      .legend {
        position: absolute;
        left: 14px;
        bottom: 12px;
        display: flex;
        gap: 14px;
        margin: 0;
        font: 400 12px/1.6 var(--f-mono);
        color: var(--ink-3);
        pointer-events: none;
      }
      .legend i {
        display: inline-block;
        width: 10px;
        height: 10px;
        margin-right: 5px;
        vertical-align: -1px;
        border-radius: 2px;
        background: var(--seal);
      }
      .legend .arc i {
        height: 2px;
        vertical-align: 3px;
        background: var(--blue);
      }
      .nogl {
        display: grid;
        place-items: center;
        height: 100%;
        margin: 0;
        padding: 24px;
        text-align: center;
        color: var(--ink-3);
      }
      .tip {
        position: absolute;
        z-index: 2;
        translate: -50% calc(-100% - 12px);
        padding: 6px 10px;
        border: 1.5px solid var(--ink);
        border-radius: 10px;
        background: var(--card);
        box-shadow: 2px 3px 0 rgba(28, 34, 48, 0.18);
        font: 500 13px/1.45 var(--f-sans);
        white-space: nowrap;
        pointer-events: none;
      }
      .tip span {
        display: block;
        font: 400 12px/1.5 var(--f-mono);
        color: var(--ink-2);
      }
      .side h2 {
        margin: 0 0 8px;
        font-size: 15px;
      }
      .kpis {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
        margin: 0 0 18px;
      }
      .kpis div {
        padding: 8px 10px;
        background: var(--card);
        border: 1px solid var(--line);
        border-radius: 10px;
      }
      .kpis dt {
        font-size: 12px;
        color: var(--ink-3);
      }
      .kpis dd {
        margin: 0;
        font: 600 18px/1.4 var(--f-mono);
      }
      .list {
        list-style: none;
        margin: 0;
        padding: 0;
        font-size: 14px;
      }
      .list li {
        position: relative;
        display: flex;
        justify-content: space-between;
        gap: 8px;
        z-index: 0;
        padding: 4px 8px;
        border-radius: 6px;
      }
      /* The bar behind each row is as wide as its share of the top row. */
      .list li::before {
        content: "";
        position: absolute;
        inset: 0 auto 0 0;
        width: var(--w);
        border-radius: 6px;
        background: var(--blue-soft);
        z-index: -1;
      }
      .list .v {
        font-family: var(--f-mono);
        color: var(--ink-2);
      }
      .note {
        margin: 12px 0 0;
        font-size: 12px;
        color: var(--ink-3);
      }
      @media (max-width: 820px) {
        main {
          padding: 20px 16px 32px;
        }
        h1 {
          font-size: 24px;
        }
        .grid {
          grid-template-columns: minmax(0, 1fr);
        }
        .stage {
          height: min(92vw, 520px);
        }
      }
    </style>
  </head>
  <body>
    <main>
      <p class="kicker">VISITORS · 示例数据</p>
      <h1>访客从哪来</h1>
      <p class="hint">拖动地球转着看；红色光柱越高，那个国家的访客越多，蓝色弧线飞向目的地。数字都是编的。</p>
      <div class="grid">
        <div class="stage" data-stage>
          <div class="tip" data-tip hidden></div>
          <p class="legend" aria-hidden="true">
            <span><i></i>访客数</span><span class="arc"><i></i>飞向目的地</span>
          </p>
        </div>
        <aside class="side">
          <dl class="kpis">
            <div>
              <dt>访客</dt>
              <dd data-kpi="visitors">–</dd>
            </div>
            <div>
              <dt>国家 / 地区</dt>
              <dd data-kpi="countries">–</dd>
            </div>
            <div>
              <dt>目的地</dt>
              <dd data-kpi="home">–</dd>
            </div>
          </dl>
          <h2>访客最多的地方</h2>
          <ol class="list" data-list></ol>
          <p class="note">点地球上的光柱（或鼠标悬停）看具体数字。</p>
        </aside>
      </div>
    </main>

    <!-- window.GEO: land bitmap + one point per country (Natural Earth, public domain). -->
    <script src="geo.js"></script>
    <script type="importmap">
      {
        "imports": {
          "three": "https://cdn.jsdelivr.net/npm/three@0.186.1/build/three.module.js",
          "three/addons/": "https://cdn.jsdelivr.net/npm/three@0.186.1/examples/jsm/"
        }
      }
    </script>
    <script type="module">
      import {
        AdditiveBlending,
        BackSide,
        BufferAttribute,
        BufferGeometry,
        Color,
        CylinderGeometry,
        Group,
        InstancedMesh,
        Matrix4,
        Mesh,
        MeshBasicMaterial,
        NormalBlending,
        PerspectiveCamera,
        Points,
        Quaternion,
        QuadraticBezierCurve3,
        RingGeometry,
        Scene,
        ShaderMaterial,
        SphereGeometry,
        SRGBColorSpace,
        TubeGeometry,
        Vector3,
        WebGLRenderer,
      } from "three";
      import { mergeGeometries } from "three/addons/utils/BufferGeometryUtils.js";

      // ---------- sample data (made up) ----------
      // Visitors per country, keyed by ISO 3166-1 alpha-2 code; in a real site this comes from your
      // analytics. HOME is where every arc lands.
      const HOME = { name: "上海", lat: 31.23, lon: 121.47 };
      const VISITORS = {
        CN: 4210,
        US: 1830,
        JP: 920,
        SG: 640,
        DE: 520,
        GB: 480,
        KR: 450,
        CA: 360,
        AU: 300,
        FR: 280,
        IN: 260,
        NL: 180,
        BR: 150,
        RU: 140,
        MY: 130,
        TH: 110,
        VN: 100,
        ID: 90,
        ES: 80,
        IT: 70,
        SE: 60,
        AE: 50,
        TR: 45,
        MX: 40,
        ZA: 40,
        NZ: 30,
        AR: 25,
        EG: 20,
        KE: 15,
        CL: 12,
      };

      const D = Math.PI / 180;
      const DOTS = 52000; // dots over the whole sphere; about 30% land on land
      const MAX_ARCS = 48;
      const ARC_STEPS = 40;
      const UP = new Vector3(0, 1, 0);
      const { land, points: POINTS } = window.GEO;
      const reduced = matchMedia("(prefers-reduced-motion: reduce)").matches;
      const darkQuery = matchMedia("(prefers-color-scheme: dark)");

      let regionNames = null;
      try {
        regionNames = new Intl.DisplayNames(["zh-CN"], { type: "region" });
      } catch {}
      const nameOf = (code) => regionNames?.of(code) ?? code;
      const rows = Object.entries(VISITORS)
        .map(([code, visitors]) => ({ code, name: nameOf(code), visitors }))
        .sort((a, b) => b.visitors - a.visitors);

      // ---------- the side panel ----------
      const num = new Intl.NumberFormat("zh-CN");
      document.querySelector('[data-kpi="visitors"]').textContent = num.format(
        rows.reduce((s, r) => s + r.visitors, 0),
      );
      document.querySelector('[data-kpi="countries"]').textContent = rows.length;
      document.querySelector('[data-kpi="home"]').textContent = HOME.name;
      const max0 = rows[0].visitors;
      document.querySelector("[data-list]").replaceChildren(
        ...rows.slice(0, 10).map((r) => {
          const li = document.createElement("li");
          li.style.setProperty("--w", `${(r.visitors / max0) * 100}%`);
          const n = document.createElement("span");
          n.textContent = r.name;
          const v = document.createElement("span");
          v.className = "v";
          v.textContent = num.format(r.visitors);
          li.append(n, v);
          return li;
        }),
      );

      // ---------- the globe ----------
      /** lat/lon in degrees to a point on a sphere of radius r; longitude 0 faces +z. */
      function vec(lat, lon, r = 1) {
        const la = lat * D;
        const lo = lon * D;
        return new Vector3(r * Math.cos(la) * Math.sin(lo), r * Math.sin(la), r * Math.cos(la) * Math.cos(lo));
      }

      // Evenly spread dots (a Fibonacci sphere), keeping the ones that fall on land.
      function landDots() {
        const bits = Uint8Array.from(atob(land.bits), (c) => c.charCodeAt(0));
        const isLand = (lat, lon) => {
          const x = Math.min(land.w - 1, Math.floor((lon + 180) * 2));
          const y = Math.min(land.h - 1, Math.floor((90 - lat) * 2));
          const n = y * land.w + x;
          return (bits[n >> 3] >> (n & 7)) & 1;
        };
        const out = [];
        const golden = Math.PI * (3 - Math.sqrt(5));
        for (let i = 0; i < DOTS; i++) {
          const y = 1 - (2 * (i + 0.5)) / DOTS;
          const r = Math.sqrt(1 - y * y);
          const x = Math.cos(golden * i) * r;
          const z = Math.sin(golden * i) * r;
          if (isLand(Math.asin(y) / D, Math.atan2(x, z) / D)) out.push(x * 1.002, y * 1.002, z * 1.002);
        }
        return new Float32Array(out);
      }

      function slerp(a, b, angle, t) {
        const s = Math.sin(angle);
        return a
          .clone()
          .multiplyScalar(Math.sin((1 - t) * angle) / s)
          .add(b.clone().multiplyScalar(Math.sin(t * angle) / s));
      }

      const css = (name) =>
        new Color(getComputedStyle(document.documentElement).getPropertyValue(name).trim() || "#888");

      function mountGlobe(stage, tip) {
        const canvas = document.createElement("canvas");
        canvas.setAttribute("aria-hidden", "true");
        // Throws without WebGL; the caller then shows a note and keeps the list.
        const renderer = new WebGLRenderer({ canvas, antialias: true, alpha: true, powerPreference: "low-power" });
        const dpr = Math.min(window.devicePixelRatio, 2);
        renderer.setPixelRatio(dpr);
        renderer.outputColorSpace = SRGBColorSpace;

        const scene = new Scene();
        const camera = new PerspectiveCamera(30, 1, 0.1, 50);
        camera.position.set(0, 0, 5);
        const tilt = new Group(); // leans the north towards the reader
        const spin = new Group(); // turns about the poles
        tilt.rotation.x = 0.42;
        spin.rotation.y = -(HOME.lon - 10) * D; // start with the destination a little right of centre
        tilt.add(spin);
        scene.add(tilt);

        // An opaque sphere just under the dots hides the dots on the far side.
        const body = new MeshBasicMaterial();
        spin.add(new Mesh(new SphereGeometry(0.995, 72, 48), body));

        // A soft rim of light around the edge (a back-facing sphere, brightest at the silhouette).
        const halo = new ShaderMaterial({
          uniforms: { uColor: { value: new Color() }, uStrength: { value: 0.5 } },
          vertexShader: `varying vec3 vN; void main() { vN = normalize(normalMatrix * normal); gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0); }`,
          fragmentShader: `uniform vec3 uColor; uniform float uStrength; varying vec3 vN;
            void main() { float a = pow(clamp(0.62 + vN.z, 0.0, 1.0), 4.0); gl_FragColor = vec4(uColor, a * uStrength); }`,
          side: BackSide,
          transparent: true,
          depthWrite: false,
        });
        tilt.add(new Mesh(new SphereGeometry(1.09, 64, 32), halo));

        // Land dots, fading out towards the edge of the disc.
        const dotGeo = new BufferGeometry();
        dotGeo.setAttribute("position", new BufferAttribute(landDots(), 3));
        const dots = new ShaderMaterial({
          uniforms: { uColor: { value: new Color() }, uSize: { value: 1.9 * dpr }, uAlpha: { value: 0.8 } },
          vertexShader: `uniform float uSize; varying float vFace;
            void main() {
              vec4 mv = modelViewMatrix * vec4(position, 1.0);
              vFace = dot(normalize(normalMatrix * position), normalize(-mv.xyz));
              gl_PointSize = uSize;
              gl_Position = projectionMatrix * mv;
            }`,
          fragmentShader: `uniform vec3 uColor; uniform float uAlpha; varying float vFace;
            void main() {
              if (length(gl_PointCoord - 0.5) > 0.5) discard;
              gl_FragColor = vec4(uColor, uAlpha * smoothstep(-0.05, 0.45, vFace));
            }`,
          transparent: true,
        });
        spin.add(new Points(dotGeo, dots));

        // Pillars: one unit cylinder standing on its base, placed and stretched per country (one draw call).
        const beamGeo = new CylinderGeometry(1, 1, 1, 10, 1, false).translate(0, 0.5, 0);
        const beamMat = new MeshBasicMaterial({ transparent: true, opacity: 0.92 });
        const beams = new InstancedMesh(beamGeo, beamMat, rows.length);
        spin.add(beams);

        // Arcs: thin tubes from each country to HOME, merged into one geometry; `t` runs 0 → 1 along each,
        // and a pulse runs along it in the shader.
        const arcMat = new ShaderMaterial({
          uniforms: { uColor: { value: new Color() }, uTime: { value: 0 }, uBase: { value: 0.22 } },
          vertexShader: `attribute float t; attribute float seed; varying float vT; varying float vSeed;
            void main() { vT = t; vSeed = seed; gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0); }`,
          fragmentShader: `uniform vec3 uColor; uniform float uTime; uniform float uBase; varying float vT; varying float vSeed;
            void main() {
              float head = fract(uTime * 0.22 + vSeed);
              float d = head - vT;
              float pulse = d >= 0.0 && d < 0.22 ? 1.0 - d / 0.22 : 0.0;
              gl_FragColor = vec4(uColor, uBase + pulse * 0.85);
            }`,
          transparent: true,
          depthWrite: false,
          blending: AdditiveBlending,
        });
        const arcs = new Mesh(new BufferGeometry(), arcMat);
        spin.add(arcs);

        // HOME: a dot and a ring that keeps spreading out from it.
        const homeN = vec(HOME.lat, HOME.lon);
        const homeQ = new Quaternion().setFromUnitVectors(new Vector3(0, 0, 1), homeN);
        const homeMat = new MeshBasicMaterial({ transparent: true });
        const ringMat = new MeshBasicMaterial({ transparent: true, depthWrite: false });
        const homeDot = new Mesh(new RingGeometry(0, 0.016, 24), homeMat);
        const ring = new Mesh(new RingGeometry(0.02, 0.026, 40), ringMat);
        for (const m of [homeDot, ring]) {
          m.position.copy(homeN).multiplyScalar(1.004);
          m.quaternion.copy(homeQ);
          spin.add(m);
        }

        // Colours come from the page's CSS tokens, so the globe follows light / dark like the rest.
        const theme = () => {
          const dark = darkQuery.matches;
          body.color = css("--paper-2");
          dots.uniforms.uColor.value = css("--ink-3");
          dots.uniforms.uAlpha.value = dark ? 0.75 : 0.65;
          halo.uniforms.uColor.value = css("--blue");
          halo.uniforms.uStrength.value = dark ? 0.45 : 0.22;
          beamMat.color = css("--seal");
          arcMat.uniforms.uColor.value = css("--blue");
          arcMat.blending = dark ? AdditiveBlending : NormalBlending; // adding light shows nothing on paper
          arcMat.uniforms.uBase.value = dark ? 0.2 : 0.28;
          arcMat.needsUpdate = true;
          homeMat.color = css("--seal");
          ringMat.color = css("--seal");
          wake();
        };

        // Pillars grow from the ground towards their height; the tallest is the busiest country.
        const max = Math.max(1, ...rows.map((r) => r.visitors));
        const shown = rows
          .filter((r) => POINTS[r.code])
          .map((row) => {
            const [lon, lat] = POINTS[row.code];
            const n = vec(lat, lon);
            return {
              row,
              n,
              q: new Quaternion().setFromUnitVectors(UP, n),
              h: 0,
              to: 0.04 + 0.42 * Math.sqrt(row.visitors / max), // sqrt, so small countries still show
            };
          });
        const m4 = new Matrix4();
        const sc = new Vector3();
        const W = 0.011;
        const placeBeams = () => {
          let moving = false;
          shown.forEach((b, i) => {
            const step = reduced ? b.to - b.h : (b.to - b.h) * 0.08;
            b.h = Math.abs(step) < 1e-4 ? b.to : b.h + step;
            if (b.h !== b.to) moving = true;
            m4.compose(b.n, b.q, sc.set(W, Math.max(b.h, 1e-4), W));
            beams.setMatrixAt(i, m4);
          });
          beams.count = shown.length;
          beams.instanceMatrix.needsUpdate = true;
          return moving;
        };

        // Each arc rises from the country, peaks over the middle of the great circle (higher for
        // longer trips) and comes down at HOME. Countries too close to HOME get no arc.
        const tubes = [];
        for (const b of shown) {
          if (tubes.length >= MAX_ARCS) break;
          const angle = b.n.angleTo(homeN);
          if (angle < 4 * D) continue;
          const mid = slerp(b.n, homeN, angle, 0.5).multiplyScalar(1 + 0.12 + 0.7 * (angle / Math.PI));
          const tube = new TubeGeometry(new QuadraticBezierCurve3(b.n, mid, homeN), ARC_STEPS, 0.0032, 5, false);
          const uv = tube.getAttribute("uv");
          const t = new Float32Array(uv.count);
          for (let i = 0; i < uv.count; i++) t[i] = uv.getX(i);
          tube.setAttribute("t", new BufferAttribute(t, 1));
          tube.setAttribute(
            "seed",
            new BufferAttribute(new Float32Array(uv.count).fill((tubes.length * 0.618) % 1), 1),
          );
          tube.deleteAttribute("normal");
          tube.deleteAttribute("uv");
          tubes.push(tube);
        }
        arcs.geometry = mergeGeometries(tubes);
        for (const g of tubes) g.dispose();

        // Dragging spins the globe (and, with a mouse, tilts it a little); a flick keeps it turning.
        let dragging = false;
        let moved = 0;
        let lastX = 0;
        let lastY = 0;
        let vel = 0;
        let idleSince = performance.now();
        canvas.addEventListener("pointerdown", (e) => {
          dragging = true;
          moved = 0;
          lastX = e.clientX;
          lastY = e.clientY;
          vel = 0;
          canvas.setPointerCapture(e.pointerId);
          wake();
        });
        canvas.addEventListener("pointermove", (e) => {
          if (!dragging) {
            if (e.pointerType === "mouse") hover(e.clientX, e.clientY);
            return;
          }
          const dx = e.clientX - lastX;
          const dy = e.clientY - lastY;
          moved += Math.abs(dx) + Math.abs(dy);
          lastX = e.clientX;
          lastY = e.clientY;
          vel = dx * 0.006;
          spin.rotation.y += vel;
          if (e.pointerType === "mouse") tilt.rotation.x = Math.min(1.1, Math.max(-0.5, tilt.rotation.x + dy * 0.004));
          showTip(null);
          wake();
        });
        const end = (e) => {
          if (!dragging) return;
          dragging = false;
          idleSince = performance.now();
          if (moved < 6) hover(e.clientX, e.clientY); // a tap, not a drag: show that pillar's numbers
        };
        canvas.addEventListener("pointerup", end);
        canvas.addEventListener("pointercancel", () => (dragging = false));
        canvas.addEventListener("pointerleave", (e) => {
          if (e.pointerType === "mouse" && !dragging) showTip(null);
        });

        function showTip(b, x, y) {
          if (!b) {
            tip.hidden = true;
            return;
          }
          tip.replaceChildren(b.row.name);
          const v = document.createElement("span");
          v.textContent = `${num.format(b.row.visitors)} 位访客`;
          tip.append(v);
          tip.style.left = `${x}px`;
          tip.style.top = `${y}px`;
          tip.hidden = false;
        }

        // The pillar whose top is nearest the pointer (within 16px), on the side facing the reader.
        const top = new Vector3();
        const face = new Vector3();
        const q = new Quaternion();
        function hover(x, y) {
          const r = canvas.getBoundingClientRect();
          spin.getWorldQuaternion(q);
          let best = null;
          let bestD = 16 * 16;
          let at = [0, 0];
          for (const b of shown) {
            face.copy(b.n).applyQuaternion(q);
            if (face.z < 0.1) continue;
            top.copy(b.n).multiplyScalar(1 + b.h);
            spin.localToWorld(top).project(camera);
            const sx = r.left + ((top.x + 1) / 2) * r.width;
            const sy = r.top + ((1 - top.y) / 2) * r.height;
            const d = (sx - x) ** 2 + (sy - y) ** 2;
            if (d < bestD) {
              bestD = d;
              best = b;
              at = [sx - r.left, sy - r.top];
            }
          }
          showTip(best, at[0], at[1]);
        }

        stage.prepend(canvas);
        new ResizeObserver(([entry]) => {
          const { width, height } = entry.contentRect;
          renderer.setSize(width, height, false);
          camera.aspect = width / Math.max(1, height);
          // Keep the whole globe in view on tall, narrow screens.
          camera.position.z = camera.aspect < 1 ? 5 / camera.aspect ** 0.8 : 5;
          camera.updateProjectionMatrix();
          wake();
        }).observe(stage);

        // Render only while on screen and while something moves.
        let visible = false;
        let running = false;
        let last = performance.now();
        function frame(now) {
          const dt = Math.min(0.05, (now - last) / 1000);
          last = now;
          let busy = placeBeams() || dragging;
          if (!dragging && Math.abs(vel) > 1e-4) {
            spin.rotation.y += vel;
            vel *= 0.94;
            busy = true;
          }
          if (!reduced) {
            if (!dragging && now - idleSince > 2500) spin.rotation.y += dt * 0.08;
            arcMat.uniforms.uTime.value += dt;
            const p = (now / 1600) % 1;
            ring.scale.setScalar(1 + p * 2.4);
            ringMat.opacity = 1 - p;
            busy = true;
          }
          renderer.render(scene, camera);
          if (!busy || !visible) stop();
        }
        function wake() {
          if (running || !visible) return;
          running = true;
          last = performance.now();
          renderer.setAnimationLoop(frame);
        }
        function stop() {
          running = false;
          renderer.setAnimationLoop(null);
        }
        new IntersectionObserver(([e]) => {
          visible = e.isIntersecting;
          if (visible) wake();
        }).observe(stage);
        darkQuery.addEventListener("change", theme);
        theme();
      }

      const stage = document.querySelector("[data-stage]");
      try {
        mountGlobe(stage, stage.querySelector("[data-tip]"));
      } catch {
        const p = document.createElement("p");
        p.className = "nogl";
        p.textContent = "这个浏览器没开 WebGL，地球画不出来；右边的列表照样能看。";
        stage.replaceChildren(p);
      }
    </script>
  </body>
</html>

// Map data for the globe, loaded as a plain <script> so the demo also opens from file://.
// Both parts come from Natural Earth 1:50m (public domain, naturalearthdata.com), v5.1.2.
//
// GEO.land   where the land is, as a 0.5-degree bitmap: 720 x 360 cells, row 0 at 90N, column 0 at
//            180W, one bit per cell (bit n of the decoded bytes is cell n = y * 720 + x, low bit first).
//            Land only, no borders. build-land.mjs rebuilds it from ne_50m_land.geojson.
// GEO.points one [longitude, latitude] per ISO 3166-1 alpha-2 code: Natural Earth's label point
//            (LABEL_X / LABEL_Y of ne_50m_admin_0_countries), where that country's pillar stands.
window.GEO = {
  land: {
    w: 720,
    h: 360,
    bits: 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    KM: [43.32, -11.73],
    KN: [-62.76, 17.34],
    KP: [126.44, 39.89],
    KR: [128.13, 36.38],
    KW: [47.31, 29.41],
    KY: [-81.24, 19.32],
    KZ: [68.69, 49.05],
    LA: [102.53, 19.43],
    LB: [35.99, 34.13],
    LC: [-60.98, 13.89],
    LI: [9.56, 47.11],
    LK: [80.7, 7.58],
    LR: [-9.46, 6.45],
    LS: [28.25, -29.48],
    LT: [24.09, 55.1],
    LU: [6.08, 49.73],
    LV: [25.46, 57.07],
    LY: [18.01, 26.64],
    MA: [-7.19, 31.65],
    MC: [7.4, 43.74],
    MD: [28.49, 47.43],
    ME: [19.14, 42.8],
    MF: [-63.05, 18.08],
    MG: [46.7, -18.63],
    MH: [171.19, 7.08],
    MK: [21.56, 41.56],
    ML: [-2.04, 18.69],
    MM: [95.8, 21.57],
    MN: [104.15, 46],
    MO: [113.56, 22.13],
    MP: [145.73, 15.19],
    MR: [-9.74, 19.59],
    MS: [-62.19, 16.74],
    MT: [14.43, 35.89],
    MU: [57.57, -20.3],
    MV: [73.51, 4.17],
    MW: [33.61, -13.39],
    MX: [-102.29, 23.92],
    MY: [113.84, 2.53],
    MZ: [37.84, -13.94],
    NA: [17.11, -20.58],
    NC: [165.08, -21.06],
    NE: [9.5, 17.45],
    NF: [167.95, -29.03],
    NG: [7.5, 9.44],
    NI: [-85.07, 12.67],
    NL: [5.61, 52.42],
    NO: [9.68, 61.36],
    NP: [83.64, 28.3],
    NR: [166.93, -0.52],
    NU: [-169.86, -19.05],
    NZ: [172.79, -39.76],
    OM: [57.34, 22.12],
    PA: [-80.35, 8.72],
    PE: [-72.9, -12.98],
    PF: [-149.46, -17.63],
    PG: [143.91, -5.7],
    PH: [122.47, 11.2],
    PK: [68.55, 29.33],
    PL: [19.49, 51.99],
    PM: [-56.33, 47.04],
    PN: [-128.32, -24.36],
    PR: [-66.48, 18.23],
    PS: [35.29, 32.05],
    PT: [-8.27, 39.61],
    PW: [134.58, 7.52],
    PY: [-60.15, -21.67],
    QA: [51.14, 25.24],
    RO: [24.97, 45.73],
    RS: [20.79, 44.19],
    RU: [44.69, 58.25],
    RW: [30.1, -1.9],
    SA: [44.7, 23.81],
    SB: [159.17, -8.03],
    SC: [55.48, -4.68],
    SD: [29.26, 16.33],
    SE: [19.02, 65.86],
    SG: [103.82, 1.37],
    SH: [-5.71, -15.95],
    SI: [14.92, 46.06],
    SK: [19.05, 48.73],
    SL: [-11.76, 8.62],
    SM: [12.44, 43.93],
    SN: [-14.78, 15.14],
    SO: [45.19, 3.57],
    SR: [-55.91, 4.14],
    SS: [30.39, 7.23],
    ST: [7.02, 0.97],
    SV: [-88.89, 13.69],
    SX: [-63.07, 18.04],
    SY: [38.28, 35.01],
    SZ: [31.47, -26.53],
    TC: [-71.75, 21.82],
    TD: [18.65, 15.14],
    TF: [69.12, -49.3],
    TG: [1.06, 8.81],
    TH: [101.07, 15.46],
    TJ: [72.59, 38.2],
    TL: [125.85, -8.8],
    TM: [58.68, 39.86],
    TN: [9.01, 33.69],
    TO: [-175.16, -21.21],
    TR: [34.51, 39.35],
    TT: [-60.92, 11],
    TV: [179.21, -8.51],
    TW: [120.87, 23.65],
    TZ: [34.96, -6.05],
    UA: [32.14, 49.72],
    UG: [32.95, 1.97],
    US: [-97.48, 39.54],
    UY: [-55.97, -32.96],
    UZ: [64.01, 41.69],
    VA: [12.45, 41.9],
    VC: [-61.34, 13.09],
    VE: [-64.6, 7.18],
    VG: [-64.64, 18.43],
    VI: [-64.78, 17.75],
    VN: [105.39, 21.72],
    VU: [166.91, -15.37],
    WF: [-178.14, -14.29],
    WS: [-172.44, -13.64],
    XK: [20.86, 42.59],
    YE: [45.87, 15.33],
    ZA: [23.67, -29.71],
    ZM: [26.4, -14.66],
    ZW: [29.93, -18.91],
  },
};

// Rebuilds GEO.land in geo.js: a 0.5-degree land bitmap from any land polygons in GeoJSON.
//
//   1. Download ne_50m_land.geojson from Natural Earth (public domain), e.g. from
//      https://github.com/nvkelso/natural-earth-vector/tree/master/geojson
//   2. node build-land.mjs ne_50m_land.geojson > land.json
//   3. Paste the output after `land:` in geo.js.
//
// Cell (x, y) covers longitude -180 + x / 2 … and latitude 90 - y / 2 …; a cell is land when its centre
// is. Each row is filled as a scanline (even-odd over every ring), which is exact in this plate carrée
// grid and takes well under a second.
import { readFileSync } from "node:fs";

const file = process.argv[2];
if (!file) {
  console.error("usage: node build-land.mjs <land.geojson>");
  process.exit(1);
}
const land = JSON.parse(readFileSync(file, "utf8"));
const W = 720;
const H = 360;
const bits = new Uint8Array((W * H) / 8);
const rings = land.features.flatMap((f) =>
  f.geometry.type === "Polygon" ? f.geometry.coordinates : f.geometry.coordinates.flat(),
);
for (let y = 0; y < H; y++) {
  const lat = 90 - (y + 0.5) / 2;
  const xs = [];
  for (const ring of rings) {
    for (let i = 0, j = ring.length - 1; i < ring.length; j = i++) {
      const [x1, y1] = ring[i];
      const [x2, y2] = ring[j];
      if (y1 > lat !== y2 > lat) xs.push(x1 + ((lat - y1) / (y2 - y1)) * (x2 - x1));
    }
  }
  xs.sort((a, b) => a - b);
  for (let k = 0; k + 1 < xs.length; k += 2) {
    for (let x = Math.max(0, Math.ceil((xs[k] + 180) * 2 - 0.5)); x < W && (x + 0.5) / 2 - 180 < xs[k + 1]; x++) {
      const n = y * W + x;
      bits[n >> 3] |= 1 << (n & 7);
    }
  }
}
process.stdout.write(`${JSON.stringify({ w: W, h: H, bits: Buffer.from(bits).toString("base64") })}\n`);

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What makes it work

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Source MIT licensed. Take it.