# Atoll — Living Geometry

Open `index.html` in a WebGL2 browser. No build step or network connection is needed.

- Choose Coral, Mitosis, Worms, or Spots to start a randomized field with that preset's Gray–Scott rates.
- Drag on the 3D surface to seed chemical B. The brush slider changes its size.
- Adjust Feed and Kill for custom behavior; use Pause/Resume and Re-seed to control the run.
- Auto-play starts on its own, changes presets every 12 seconds, and keeps the camera orbiting. Any manual change turns auto-play off; use its button to turn it back on.
- Keyboard shortcuts: **Space** pauses or resumes, **R** re-seeds, and **1–4** selects presets.