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CommunityJev Demos & Experiments
Jev's Fly
A Three.js first-person garden game where a glowing fly hunts goblins and TypeSafe's Jev steers: about five times per second it answers four typed questions on turning, sidestepping trunks, climbing and diving, and every flight is logged.
- Stars
- 16
- Language
- JavaScript
- Reading time
- 3 min
- Published by
- Community
- Author
- webdevcody
- Last verified
- Oct 2026
Works forJev for Realtime control
Used inJev for Gaming
- Languages
- JavaScript
- Platforms
- Browser
- Capabilities
- Open sourceRequires API key
Highlights
- Jev chooses the fly's heading and dive about five times per second from the goblin's bearing, its angle below the horizon and line-of-sight blockers.
- Four typed questions: which way to turn, whether to sidestep a trunk, whether to climb or descend, and whether to dive at 30, 45, 60, 75 or 90 degrees.
- Flights are appended to .audit/flights/flights-YYYY-MM-DD.jsonl with 0.1 s path samples, each Jev round trip with its latency, and the crash outcome.
- npm run flight-test -- --secs 120 --seed 7 runs headless Chrome; adding --mock answers the questions locally from their criteria and spends no API credits.
- Controls: P pauses game and API calls, M mutes, H hides the HUD, V or the 3RD PERSON | FPV button switches cameras; without a key the fly waits at its flower.
Quickstart
bash
npm install
npm startWatch out
Grounded in the truncated repository README, screenshots and GitHub metadata reviewed on 2026-10-15; the repository declares no license, the README publishes no performance measurements, and without a TYPESAFE_API_KEY the fly waits at its flower.
Questions about this entry
Short answers drawn from the linked project or page.
TypeSafe's Jev chooses the fly's heading and dive about five times per second. It receives the goblin's bearing, its angle below the horizon, whether a tree or the ground blocks the line of sight, a climb angle and nearby trunk gaps, then answers four typed questions.
Which way to turn, whether to sidestep a trunk, whether to climb or descend using an angle that keeps the fly about 2 m over the ground under the canopies, and whether to dive at 30, 45, 60, 75 or 90 degrees along a clear line.
With Node installed, run npm install, add TYPESAFE_API_KEY=apikey_... to .env for Jev decisions, then npm start and open http://localhost:5173. Click LET'S FLY to start; ?autostart=1 starts immediately and without a key the fly waits at its flower.
Yes for tuning: npm run flight-test -- --secs 120 --seed 7 runs the game in headless Chrome and saves flights to .audit/flights, and adding --mock answers Jev's questions locally from their own criteria, spending no API credits.
The server appends one JSONL line per flight in .audit/flights with a 0.1 s path sample (position, speed, pitch, roll, clearance and Jev's answers), every Jev round trip with latency, and the crash outcome. FLIGHT_LOG=0 turns logging off.
P pauses the game and API calls, M mutes, H hides the HUD, and V or the 3RD PERSON | FPV button switches between the chase camera and the fly's full-screen FPV camera, moving the other view into a small window.
A close swoop pops the goblin and fly into sparkles and both return for another round, while hitting a tree, the ground, depleted nectar or a spell resets the fly. Web Dev Cody built this demo; the repository declares no license.
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