Exposing GetGroundHit.WheelHit() in Car Tutorial

Scripting
1

Hello,

I am trying to expose the force value in the WheelHit struct in the Car Tutorial and print it to the console.

I made a gameObject called infoGUI, with a JS Script called infoGUI.js.

When I run the code, I get this error:
MissingMethodException: Method not found: ‘UnityEngine.WheelCollider.GetGroundHit’.

Here is the code:

private var frontWheelLeft;

private var fwlInfo : WheelHit;

function Awake () {

	guiText.material.color = Color.white;

}

function Start() {

		frontWheelLeft = GameObject.Find("DiscBrakeFL Collider").GetComponent(WheelCollider);

}


function FixedUpdate () {
	
	frontWheelLeft.GetGroundHit(fwlInfo);
	print(fwlInfo.force);

}

Thanks!

EDIT: I should note that printing out something like frontWheelLeft.radius works just fine, which is why I don’t know the reason for GetGroundHit not working.

2

What is the type of frontWheelLeft ?

3

It’s a WheelCollider. I guess the code would be more efficient if I had declared the type in the beginning instead of letting JavaScript doing it dynamically on Start. Nevertheless, it should work like this because as I mentioned I was able to access some of the WheelCollider’s properties like the radius, but not the GetGroundHit function.

Thanks!

4

Declare the type of the frontWheelLeft.

That should solve the problem.

private var frontWheelLeft : WheelCollider; 

private var fwlInfo : WheelHit; 

function Awake () { 

   guiText.material.color = Color.white; 

} 

function Start() { 

      frontWheelLeft = GameObject.Find("DiscBrakeFL Collider").GetComponent(WheelCollider); 

} 


function FixedUpdate () 
{ 
   frontWheelLeft.GetGroundHit(fwlInfo); 
   print(fwlInfo.force);
}

This should work.

5

It did work! Thank you so much.

Would you mind giving me a bit of theory behind the reason why it didn’t work before? How come I was able to access radius and not GetGroundHit?

I guess letting JS dynamically assign types should be avoided whenever possible, even though it seems it wasn’t doing so here.