[Help] How do I clamp Quaternion rotation?

So I was trying to make an FPS character controller, but my camera can rotate 360 degrees upwards and downwards (which I don't want to happen).

Here is my rotation script in C#, can someone please tell me how to clamp the rotation?

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class YaxisLook : MonoBehaviour {
5.  
6.     public float rotateVel = 100;
7.     public float inputDelay = 0.1f;
8.  
9.     public float yMin;
10.     public float yMax;
11.     private float yRot;
12.  
13.     public float turnInput;
14.  
15.     private Quaternion targetRotation;
16.  
17.     // Use this for initialization
18.     void Start () {
19.         targetRotation = transform.rotation;
20.         turnInput = 0;
21.     }
22.    
23.     // Update is called once per frame
24.     void Update () {
25.         turnInput = Input.GetAxis("Mouse Y");
26.  
27.         if (Mathf.Abs(turnInput) > inputDelay)
28.         {
29.             targetRotation *= Quaternion.AngleAxis(rotateVel * -turnInput * Time.deltaTime, Vector3.right);
30.         }
31.         transform.rotation = targetRotation;
32.     }
33. }
34.  

 

We could naively just try to clamp the y values between some yMin and YMax, but the problem is when you rotate downwards your going from 0 to some value say 45. So thats fine. But when you rotate up to -45 Unity is turning that number in to 315. So we need to split up our clamp between up and down.

Code (CSharp):

1. // set this in degrees up like 45 or 60
2. // the code below converts it
3. public float maxUpAngle;
4. // Same for down.  Should be max degrees down you can rotate
5. public float maxDownAngle;
6. private float actualUpAngle;
7.  
8. void Awake()
9. {
10.    actualUpAngle = 360-maxUpAngle;
11. }
12. void Update()
13.    turnInput = Input.GetAxis("Mouse Y");
14.    if (Math.Abs(turnInput ) > inputDelay)
15.    {
16.        targetRotation *= Quaternion.AngleAxis(rotateVel * -turnInput * Time.deltaTime, Vector3.right);
17.        Vector3 eulerAngles =  targetRotation.eulerAngles;
18.        if (eulerAngles.y < 180)
19.             eulerAngles.y=Mathf.Clamp(eulerAngles.y,0,maxDownAngle);
20.        else
21.             eulerAngles.y = Mathf.Clamp(eulerAngles.y,actualUpangle,360);
22.        targetRotation = Quaternion.Euler(eulerAngles);
23.    }
24.    transform.rotation = targetRotation;
25. }

Just to be clear i didn't copy all your code you posted, you still need the other stuff you have in there.

 

This post is so old but thank you so much. I have been bangin' my head against my desk trying to remember how this worked for hours. Soon as I read your post it all came flooding back. Not to mention it took me hours to find your post as well. Thank you for the clear, easy explanation.