Unit direction the gas leaves in, vehicle space.
What comes out: faint tailpipe exhaust, diesel stack smoke, a steam locomotive's plume, a diesel locomotive's haze.
Outlet, vehicle space.
OptionalpulseSteam engines: metres travelled per exhaust beat (chuffs come at speed / pulse per second).
Outlet radius, metres.
Where engine smoke leaves a vehicle (threejs-particles exhaust, see
VehicleExhaust): car tailpipes, truck and tractor stacks, locomotive chimneys. Electric vehicles have none.