Starter Kit Racing

The brief, in short:

Clone mrdoob's three.js port of Kenney's Starter Kit Racing inside Airogel, entirely through the MCP tools. Don't import the kit's models: use Airogel primitives and the built-in mesh and track generators. Match the original's track layout, scenery placement, camera, lap timer, smoke, skid marks and audio as closely as the engine allows.

The agent read the original source and ported its maths rather than eyeballing it. The 16-cell grid from Track.js became a Python script that prints the exact scene-object JSON, and the scenery hash from main.js was ported with JavaScript's integer semantics so the forest lands in the same places.

• The circuit is one generated track with red and white striped curbs and yellow edge lines. The 86 collision boxes from Physics.js were merged into a single invisible collider mesh.
• Four trucks are wheeled vehicles on player slots 1 to 4, sharing one server-authoritative, client-predicted driver script. A race camera script ports the original's 45° and 35° lead and dead zone.
• Each truck has a presentation object that reads its replicated motion and drives 24 smoke puffs, 45 skid quads, positional engine and skid audio, and impact thuds. The engine sound was baked to WAV from the kit's own synth.
• Tone mapping, fog and bloom were set to the original's values with the scene settings tool.

It tested by driving Truck 1 through the editor's physics simulation, then by holding keys in a headless Chrome over the published game. The build notes and a list of engine tickets it filed are kept with the project, including the lesson that an MCP client's cached tool schema can lag behind what the server accepts.