skills/build-3d-game-rooms/assets/templates/room-layout.json

{
  "schema": "game-room.layout.v1",
  "roomId": "__ROOM_ID__",
  "units": "meters",
  "surfaces": [],
  "instances": [],
  "productionCamera": {"location": [0, 0, 0], "target": [0, 0, 0], "verticalFovDegrees": 60}
}