Quaternion in Unity 5

Hey guys just started up with Unity 5 (and Unity as a whole for that matter) and was wondering how to use Quaternion for one of the project examples. (http://unity3d.com/earn/tutorials/projects/space-shooter/moving-the-player) At the end of this video they use a Quaternion to help tilt the space ship, but unity is not excepting my code. For rigidbody I have just been using GetComponent<Rigidbody>() as a fix (I know this might not be the correct fix an answer to this would help as well) but this method is not working for Quaternion. How should i be tackling this problem?

Here is my code so far:

using UnityEngine;
using System.Collections;

[System.Serializable]
public class Boundary {
public float xMin, xMax, zMin, zMax;
}

public class PlayerController : MonoBehaviour {

public float speed;
public float tilt;
public Boundary boundary;

void FixedUpdate() {
float moveHorizontal = Input.GetAxis ("Horizontal");
float moveVertical = Input.GetAxis ("Vertical");

Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
GetComponent<Rigidbody>().velocity = movement * speed;

GetComponent<Rigidbody> ().position = new Vector3 (
Mathf.Clamp(GetComponent<Rigidbody>().position.x, boundary.xMin, boundary.xMax),
0.0f,
Mathf.Clamp(GetComponent<Rigidbody>().position.z, boundary.zMin, boundary.zMax)
);
GetComponent<Rigidbody>().rotation = GetComponent<Quaternion>().Euler (0.0f, 0.0f, GetComponent<Rigidbody>().velocity * -tilt);
}
}

 

Please use code tags when posting code.

 

Perhaps try something like this :

Code (CSharp):

1.     private void FixedUpdate() {
2.         float moveHorizontal = Input.GetAxis("Horizontal");
3.         float moveVertical = Input.GetAxis("Vertical");
4.  
5.         Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
6.         GetComponent<Rigidbody>().velocity = movement * speed;
7.  
8.         GetComponent<Rigidbody>().position = new Vector3
9.             (
10.             Mathf.Clamp(
11.                         GetComponent<Rigidbody>().position.x,
12.                         boundary.xMin,
13.                         boundary.xMax),
14.             0.0f,
15.             Mathf.Clamp(
16.                         GetComponent<Rigidbody>().position.z,
17.                         boundary.zMin,
18.                         boundary.zMax)
19.             );
20.  
21.         GetComponent<Rigidbody>().rotation = Quaternion.Euler(
22.                         0.0f,
23.                         0.0f,
24.                         GetComponent<Rigidbody>().velocity.x * -tilt
25.             );
26.     }

 

I have problems with rotating rigidbody in Unity5.
Rotating the transform worked for me.
I have no idea why (and in general what I'm doing )

 

Why do you what to rotate rigidbody instead of transform?
I suppose for rigidbody it is better to AddForce or AddForceAtPosition if you want to add some rotation.

 

@TEBZ_22, @plasmabazooka,
The tutorial repositions and rotates the Rigidbody, for what that's worth .. and the OP is just following the tutorial.
I s'pose the question should be addressed to the tutor

 

Yes that's correct, though you should cache the reference once in start

Code (CSharp):

1. Rigidbody rb;
2.  
3. //start
4. rb = GetComponent<Rigidbody>();
5.  
6. //elsewhere
7. rb.velocity = ...

For your error, ksub has the answer, you missed the velocity".x" in the quaternion

 

Thank you I will start doing this from now on!

 

Thanks a lot this worked perfectly! One question though. Isn't GetComponent hard on the CPU, I.E. shouldn't I be using a different form in order to properly keep using Rigidbody without using too much CPU power? Or is this just how it works in Unity 5?

 

No, GetComponent isn't hard on the CPU.

--Eric

 

You can take it one time and store a result to a private property of your class. You will get link to the component and don't need to call GetComponent more.

 

-
I Acualy tried the "Stelth" tutorials, using Unity5, and there the player have Rigidbodys FreezRotation(x;y;z) set, as stated in the tutorial. Then I had to rotate the Transform instead of the Rigidbody to make it work. If someone knows why..?