Drone Sim

A 3D drone simulator built with Three.js, flown autonomously by TypeSafe's Jev model through the AI SDK's @ai-sdk/typesafe-ai provider.

The mission: take off from pad A, cross a randomly generated city, land on pad B.

Run it

npm install
echo "TYPESAFE_AI_API_KEY=your-key" > .env
npm run dev

Open http://localhost:5173 and press J to hand the sticks to Jev.

Controls

Key	Action
J	Toggle Jev autopilot
R	Reset mission
W / S	Throttle
A / D	Yaw
↑ / ↓	Pitch (forward / back)
← / →	Roll (left / right)

A gamepad works too. Touching any stick while Jev is flying gives you control back. Every refresh generates a new city. The HUD shows the map seed, and /?seed=<n> replays one.

How it works

Jev is not an LLM that writes text. It answers typed questions with calibrated probabilities, in about 200 ms. So the split is simple:

• Code does the math. Altitude, bearing to the pad, speed, obstacles ahead, tallest building on the path. It turns those numbers into a short plain-language situation report (server/pilot.ts).
• Jev makes the call. One request asks six questions about that report: a Choice per stick axis (throttle, yaw, pitch, roll) and two Booleans (commit to landing? cut motors?).
• Code moves the sticks. Each answer's probability distribution becomes a stick deflection (src/autopilot.ts), with a few hard safety limits kept in code.

After landing, the banner shows total tokens and decisions Jev used for the flight.