Atlantis — Development skill for Claude Code

Atlantis

Plato's Atlantis in two eras, built entirely in code with three.js. The golden age is the ring city at sunset. The sunken era is the same city 9,000 years later, under the sea. No external assets are used: every mesh, texture, shader, statue, ship, waterfall, coral and fish is generated procedurally. Claude Code (Opus 5.5) directed a team of specialist agents to build it against 9 reference images, then rendered a 59 s 4K film on an Apple M3 Ultra.

The method and the engine core come from [Athenaion](https://github.com/Leonxlnx/athenaion) (MIT). Its source is kept for reference in [`third_party/athenaion/`](third_party/athenaion). The world modules, both eras, the underwater renderer and the film are new.


The teaser above is a 10 s excerpt at 560 px. The film itself (3840×2160, 59 s, about 1.3 GB) is not stored in this repository. Render it with the commands in [docs/RENDER.md](docs/RENDER.md). The contact sheet below has one frame per second of the film:


What's in it

• The ring city: a 62 m citadel hill crowned by the Temple of Poseidon, with three water rings, two land rings, a sea canal, moles with lighthouses, 17 km of walls clad in orichalcum, tin and bronze, 206 towers, ship-sheds cut into the rock, a great gate bridge and 12 ring bridges.
• The Temple of Poseidon: Corinthian, with a silver cella, a gold pediment relief and rearing horses, and gold tridents and pinnacles on the roof. In front stands a colossal chariot group, Poseidon and six winged horses with individually modelled feathers. All statues are sculpted as SDFs, meshed and decimated.
• City life: about 2,800 houses, 100+ landmarks, a racecourse and parks. The citadel stair is cut by a water channel, and cascades pour from the rampart outlets.
• Water and sky: turquoise rings, a cobalt sea and a moving fleet of triremes with wakes and bow spray. A low golden sun shines through sh