Mmcp.market

webgl-experience skill

by nexu-io·nexu-io/open-design·98k stars·Apache-2.0

A full-screen, real-time WebGL/WebGL2 experience — animated shaders, 3D scenes, generative visuals, particle fields — rendered live on the GPU with a typographic overlay. Produced as a single self-contained `index.html`. Use when the brief asks for a "WebGL", "shader", "3D", "generative", "GPU", "interactive canvas", "hero animation", or "real-time visual" experience. OpenDesign serves this in powered-preview mode so the GPU stack actually runs.

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Clean: nothing in its files matched our rules. We read 2 files in the folder on 2026-09-28.

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Install the webgl-experience skill

A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description. 

git clone --depth 1 https://github.com/nexu-io/open-design.git /tmp/open-design
mkdir -p ~/.claude/skills
cp -r /tmp/open-design/design-templates/webgl-experience ~/.claude/skills/webgl-experience
available in every project

In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub

The instructions your agent would load

SKILL.md as published, without the frontmatter. Read it on GitHub

WebGL Experience Skill

Produce a single self-contained index.html that renders a real-time WebGL (or WebGL2) visual full-screen, with a clean typographic overlay on top.

Why this is a powered artifact

OpenDesign detects getContext('webgl2') / new Worker / SharedArrayBuffer and renders this file in powered preview — a cross-origin-isolated iframe with allow-same-origin. That means real Web Workers, SharedArrayBuffer, WASM, and the full GPU pipeline are available. You do not need to work around the opaque sandbox. Prefer webgl2 for modern features; fall back to webgl when the effect allows.

Resource map

webgl-experience/
├── SKILL.md      ← you're reading this
└── example.html  ← a working WebGL2 aurora-field reference (READ FIRST)

Workflow

Step 0 — Read the reference

Read example.html end to end. Note the shape: one full-viewport , a fragment-shader draw loop on a fullscreen triangle, a DPR-aware resize, and a requestAnimationFrame tick. The overlay (kicker → h1 → sub) is pure HTML/CSS layered above the canvas via z-index.

Step 1 — Choose the visual

Pick ONE technique that fits the brief:

  • Fragment-shader field (default): domain-warped fbm noise, flow fields, plasma, gradients. Cheapest, always 60fps.
  • Raymarched scene: SDF spheres/boxes with soft shadows for a 3D hero.
  • Instanced geometry: thousands of points/quads driven by a vertex shader.
  • Post-processed image: sample a data-URI texture and distort/dither it.

Step 2 — Build index.html

  • Keep it one file, zero external requests (inline the shader source; embed any texture as a data: URI). Powered mode allows CDN loads, but self-contained previews are faster and portable.
  • Always: alpha:false, DPR clamped to 2, viewport on resize, and a guard that shows a graceful message if the context is null.
  • Compile shaders with error logging (getShaderInfoLog) so a typo fails loudly, not silently black.

Step 3 — Overlay + brand

  • Map the two :root-level accent colors to the active DESIGN.md when one is present; otherwise use a restrained dark palette with a single vivid accent (the reference uses lime #63fe13).
  • Headline ≤ 14ch, one supporting line. Never cover the whole canvas — the visual is the hero.

Step 4 — Self-review (P0)

  • [ ] Renders continuously at ~60fps; the FPS badge updates.
  • [ ] No WebGL console errors; getError() clean after first frame.
  • [ ] Resizes crisply on window resize (no stretching / blur).
  • [ ] Readable overlay contrast over the brightest frame.
  • [ ] Degrades to a message (not a blank page) if webgl2 is unavailable.

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