Cobejs

Meng ToCommunityCreated by Meng To

Skill
Tool integration
Software development
MIT
No issues found

From the author

Use when adding a lightweight interactive globe with cobe (canvas setup, markers, interaction, performance, integration with React/Next.js).

— the description by Meng To

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

The cobe.js skill provides a streamlined approach to implementing lightweight, interactive 3D globes using the cobe library. It covers essential setup, including canvas configuration, marker placement, and lifecycle management, making it ideal for developers who need a performant alternative to heavier 3D frameworks like Three.js for decorative or interactive globe elements.

What it does

Provides patterns for initializing and rendering interactive WebGL globes.
Explains how to configure globe appearance, including colors, scale, and lighting.
Details the integration of location markers with custom coordinates and sizes.
Offers guidance on handling canvas resizing and device pixel ratios for responsiveness.
Covers lifecycle management, including pausing and destroying globe instances.

When to use it

When you need a lightweight spinning globe for hero sections or about pages.
When you want to avoid the overhead of full 3D libraries like Three.js.
When you require a performant, interactive globe with minimal setup.
When building responsive web interfaces that require dynamic data visualization on a globe.

Advantages

Extremely lightweight compared to full-featured 3D engines.
Optimized for performance with minimal configuration.
Easily integrates into modern frontend frameworks like React and Next.js.
Supports interactive features like rotation and custom marker placement.

Usage examples

“How do I add a spinning globe to my React hero section using cobe?”: The agent provides a code snippet demonstrating how to initialize the globe within a React component, including setting up the canvas ref and handling the render loop.
“How can I add markers to my cobe globe for specific cities?”: The agent explains how to define the markers array with latitude and longitude coordinates and how to customize the marker color and size.

Install

Download the skill as a ZIP:
https://mp-staging.autogineer.com/agent-skills/mengto/cobejs/download
Unzip it into the cross-client skills folder of your project:
```
mkdir -p .agents/skills && unzip cobejs.zip -d .agents/skills
```

Documentation by Meng To

cobe.js — Lightweight WebGL Globe Skill

When to use

A “spinning globe” / location markers in hero or about pages
You want a small, focused globe lib (not full three.js)
Decorative + interactive (markers, rotation) with minimal setup

Key APIs/patterns

Core:
- import createGlobe from "cobe"
- const globe = createGlobe(canvas, { ...options, onRender(state) { ... } })
Important options (common):
- devicePixelRatio, width, height
- phi, theta (rotation angles)
- scale, dark, diffuse
- baseColor, markerColor, glowColor
- markers: [{ location: [lat, lon], size, color? }]
Lifecycle:
- globe.toggle() pauses RAF
- globe.destroy() removes instance

Common pitfalls

Canvas sizing mismatch
- Set CSS size AND set canvas width/height scaled for DPR.
Not updating on resize
- Recompute width/height and recreate or update params.
Too high DPR on mobile
- Clamp DPR to 1–2.

Quick recipe: responsive globe with markers

import createGlobe from "cobe";

const canvas = document.getElementById("cobe");
let phi = 0;

function setup() {
  const rect = canvas.getBoundingClientRect();
  const dpr = Math.min(window.devicePixelRatio, 2);
  canvas.width = Math.round(rect.width * dpr);
  canvas.height = Math.round(rect.height * dpr);

  const globe = createGlobe(canvas, {
    devicePixelRatio: dpr,
    width: canvas.width,
    height: canvas.height,
    phi: 0,
    theta: 0.2,
    dark: 0,
    diffuse: 1.2,
    scale: 1,
    mapSamples: 16000,
    mapBrightness: 6,
    baseColor: [0.2, 0.2, 0.25],
    glowColor: [1, 1, 1],
    markerColor: [0.8, 0.5, 1],
    markers: [{ location: [1.3521, 103.8198], size: 0.08 }],
    onRender: (state) => {
      state.phi = phi;
      phi += 0.01;
    },
  });

  return globe;
}

let globe = setup();
window.addEventListener("resize", () => {
  globe.destroy();
  globe = setup();
});

What to ask the user

Globe size and placement (hero, section, card)?
Marker locations + colors (brand-aligned)?
Interaction needs (drag to rotate vs. ambient spin)?

Files

ATTRIBUTION.mdAdded by AutoGineer834 B
LICENSELicence file added by AutoGineer1.0 KiB
REFERENCES.md70 B
SKILL.md2.2 KiB
demo/PROMPT.md1.7 KiB
demo/index.html15.8 KiB
demo/preview.jpg38.3 KiB

demo/index.html

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" href="data:,">
  <title>Cobe.js · Skill Demo</title>
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@keyframes marquee{to{transform:translateX(-50%)}}@keyframes wordIn{to{transform:translateY(0)}}@keyframes grow{from{transform:scaleX(0)}to{transform:scaleX(1)}}@keyframes orbA{to{transform:translate(-120px,70px)}}@keyframes orbB{to{transform:translate(80px,120px)}}@media(max-width:760px){.intro{grid-template-columns:1fr;padding-top:60px}.intro h1{font-size:54px}.layoutStudy,.pricing,.iconGrid,.contactSheet,.surfaceStudy{grid-template-columns:1fr}.layoutHero{border-right:0;border-bottom:1px solid var(--line)}.pricing article{min-height:320px}.surfaceHero{grid-row:auto}.showcase{min-height:540px}.topbar span:last-child{display:none}.demoNote{flex-direction:column}.landing .proof{flex-direction:column;gap:8px}.vizMeta{grid-template-columns:1fr auto}.vizMeta span:last-child{display:none}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.marqueeTrack,.maskLine span,.timeline i,.orbA,.orbB{animation:none;transform:none}}</style>
</head>
<body data-kind="globe" data-skill="cobejs">
  <main class="shell">
    <nav class="topbar" aria-label="Demo navigation"><a class="brand" href="#"><i></i>Cobe.js</a><span>Standalone skill reference · 01</span></nav>
    <header class="intro">
      <div><small>web design / reference demo</small><h1>Cobe.js</h1></div>
      <p>Use when adding a lightweight interactive globe with cobe (canvas setup, markers, interaction, performance, integration with React/Next.js).</p>
    </header>
    <section class="showcase" aria-label="Cobe.js demonstration">
      <div class="showcaseHeader"><span>Live example</span><span>globe</span></div>
<div class="visualization">
  <canvas aria-label="Cobe.js procedural visualization"></canvas>
  <div class="vizMeta"><span>Live field</span><strong>72.4</strong><span>Auto orbit</span></div>
</div>
    </section>
    <footer class="demoNote"><span>Open <strong>PROMPT.md</strong> for the exact recreation and remix prompts.</span><a href="PROMPT.md">Read prompt →</a></footer>
  </main>
  <script>const reduced=matchMedia("(prefers-reduced-motion: reduce)").matches;addEventListener("pointermove",event=>{document.body.style.setProperty("--mx",event.clientX+"px");document.body.style.setProperty("--my",event.clientY+"px")},{passive:true});const billing=document.querySelector(".billingToggle");if(billing)billing.addEventListener("click",()=>{const annual=billing.getAttribute("aria-pressed")!=="true";billing.setAttribute("aria-pressed",String(annual));billing.textContent=annual?"Show monthly pricing":"Show annual pricing";document.querySelectorAll(".pricing strong").forEach(price=>price.textContent=annual?price.dataset.annual:price.dataset.monthly)});const replay=document.querySelector(".replay");if(replay)replay.addEventListener("click",()=>{document.querySelectorAll(".maskLine span,.timeline i").forEach(node=>{node.style.animation="none";node.offsetHeight;node.style.animation=""})});const 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y=(i/17)*height;context.globalAlpha=.08+.12*Math.sin(time+i*.4);context.beginPath();for(let x=0;x<=width;x+=12){const wave=Math.sin(x*.012+i*.54+time*3)*18*Math.sin(i/17*Math.PI);context.lineTo(x,y+wave)}context.stroke()}context.globalAlpha=.65;const x=width*(.52+.16*Math.sin(time*.6));const gradient=context.createLinearGradient(x,0,x+2,0);gradient.addColorStop(0,"transparent");gradient.addColorStop(.5,"white");gradient.addColorStop(1,"transparent");context.fillStyle=gradient;context.fillRect(x,0,3,height)}};resize();new ResizeObserver(resize).observe(canvas);const visibility=()=>{if(document.hidden){cancelAnimationFrame(frame);frame=0}else if(!frame)draw()};document.addEventListener("visibilitychange",visibility);draw();}</script>
</body>
</html>

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Security

No issues found by our static scan· No issues found

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Attribution and licence

Created by

Meng To

Publisher

Meng To (Community)

Source

MengTo/Skills · agent-skills/web-design/cobejs · commit 5ea1661

Licence

MIT License (redistribution allowed)

LICENSE (added by AutoGineer from LICENSE)
ATTRIBUTION.md (written by AutoGineer)

Synced

2026-11-08

AutoGineer is not affiliated with or endorsed by Meng To.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download cobejs.zip