How to force 3rdpersonview always on automatically when get into a vehicle?

[xy20032004 0]

Can someone tell me how to force 3rdpersonview always on automatically when I get into a vehicle without press the switch view key? A car, apc, tank, heli, jet, no matter as a driver, gunner, or loader, commander. When I get off a vehicle, it switches back to first person view. How to write the cfg file?

Thanks!