Asset id to spawn.
Field id it works, or −1 when parked.
Yaw about up, radians, turning the model's +z (front) to face its heading (props' convention: atan2(dx, dz)).
Vehicle kind.
Ground position [x, y, z] (frame-local).
Working a field (driving along its rows) rather than parked in the yard.
Where a vehicle stands (asset id
vehicles/tractoronce threejs-vehicles has one).