# Third person navigation to navigate a car
**URL:** https://forum.castle-engine.io/t/third-person-navigation-to-navigate-a-car/571
**Category:** 3D
**Created:** [April 20, 2022, 6:22pm UTC](https://forum.castle-engine.io/t/third-person-navigation-to-navigate-a-car/571 "2022-04-20T18:22:56Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Didi](https://forum.castle-engine.io/u/Didi)
#### Post date: [April 20, 2022, 6:22pm UTC](https://forum.castle-engine.io/t/third-person-navigation-to-navigate-a-car/571/1 "2022-04-20T18:22:56Z")
Hi there,
i use the third person navigation to navigate a car in my racing game.
my car is the avatar.
following works fine:
ThirdPersonNavigation.Input\_LeftRotate.Assign(keyArrowLeft);
ThirdPersonNavigation.Input\_RightRotate.Assign(keyArrowRight);
but i use one button for moving forward:
ThirdPersonNavigation.Input\_Forward.Assign(keyR);
with arrowup and arrowdown i increase or decrease ThirdPersonNavigation.MoveSpeed.
when i stop pushing up (down is to break), the car is moving forward with very slow deceleration, like a car in real world would do.
my problem is, that i have to hold the keyR down all the time. after 10 rounds my finger hurts!
maybe someone has an idea how this could be improved.
thanks in advance
Didi
---
### Author:  [@michalis](https://forum.castle-engine.io/u/michalis)
#### Post date: [April 21, 2022, 1:14pm UTC](https://forum.castle-engine.io/t/third-person-navigation-to-navigate-a-car/571/2 "2022-04-21T13:14:50Z")
I think in this case you can move the car directly, following any logic you like, without depending on built-in input shortcuts `Input_Xxx` in TCastleThirdPersonNavigation.
That is, inside the `Update` method of your state, just check for something and move the car directly, like
```delphi
procedure TStateMain.Update(const SecondsPassed: Single; var HandleInput: Boolean);
const
CarSpeed = 5.0; // units per second
begin
inherited;
if CarMoving then
Car.Move(Car.Direction * SecondsPassed * CarSpeed);
end;
function TStateMain.Press(const Event: TInputPressRelease): Boolean;
begin
Result := inherited;
if Result then Exit; // allow the ancestor to handle keys
if Event.IsKey(keySomethingToStart) then
begin
CarMoving := true;
Exit(true); // event was handled
end;
if Event.IsKey(keySomethingToStop) then
begin
CarMoving := false;
Exit(true); // event was handled
end;
end;
```
where `Car` is the `TCastleTransform` , the same thing you use as `AvatarHierarchy` or `Avatar` in `TCastleThirdPersonNavigation`.
(see [Designing user interface and handling events (press, update) within the state | Manual | Castle Game Engine](https://castle-engine.io/manual_state_events.php) about state methods Update and Press).
Internallly, `TCastleThirdPersonNavigation.Update` does mostly the same. It calculates `A` as
```delphi
function TCastleThirdPersonNavigation.RealAvatarHierarchy: TCastleTransform;
begin
if AvatarHierarchy <> nil then
Result := AvatarHierarchy
else
Result := Avatar;
end;
```
and then does
```delphi
...
if Input_Forward.IsPressed(Container) then
begin
Moving := true;
T := T + A.Direction * Speed * SecondsPassed;
end;
...
if not T.IsPerfectlyZero then
A.Move(T, false);
...
```
---
### Author:  [@Didi](https://forum.castle-engine.io/u/Didi)
#### Post date: [April 25, 2022, 1:52pm UTC](https://forum.castle-engine.io/t/third-person-navigation-to-navigate-a-car/571/3 "2022-04-25T13:52:21Z")
thank you very much, the navigation works now how it should.