🗼 Lighthouse Fresnel Lens Lab: Beam Range, Horizon and Rotation

A coastal lighthouse with a multi-ring Fresnel lens (bullseye rings and total-internal-reflection prisms ray-traced with the real prism angles), a carriage rotating on a mercury float, and a ship whose view of the flash is limited by Allard's law, Blondel-Rey and the curvature of the sea.

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install