Simple Limitation of a rotation?

Hello

First of all, i am not so familiar with scripting, becaus i come from the design perspektiv. What i try to do is a touch control to view an object. so far, it works by using the following script:

Code (CSharp):

1.  void Update()
2.     {
3.  
4.         if (Input.touchCount == 1)
5.         {
6.             if (Input.touches.Length > 0 && Input.GetTouch(0).phase == TouchPhase.Moved)
7.             {
8.                 transform.rotation *= Quaternion.AngleAxis((Input.GetTouch(0).deltaPosition.y * rotSpeed), Vector3.left);
9.                    
10.                    
11.                 }
12.             }
13.         }

but now i want to limit the rotation to 90 degrees up and down. I tought about clamping the rotation, but i didn*t get, how to clamp that quoternian right.
Thanks for any help.

Greetings from Germany
Asta

 

Just use: transform.rotation.eulerAngles so you can use angle expression in degrees.

 

Don't do this! Euler angles suck. It won't reliably give you a useful value for this kind of functionality. (It sometimes will, but it may unexpectedly break at some point, for the reasons detailed in the linked article.)

I recommend having a Vector2 variable representing the amount you have dragged; you can safely use Mathf.Clamp on this value to limit your rotation. This value can then be applied to your transform's rotation using Quaternion.AngleAxis (make sure this is a one-way street though!)

Code (csharp):

1. Vector2 trackedRotation = Vector2.zero;
2. void Update()
3.     {
4.  
5.         if (Input.touchCount == 1)
6.         {
7.             if (Input.touches.Length > 0 && Input.GetTouch(0).phase == TouchPhase.Moved)
8.             {
9. trackedRotation.y += (Input.GetTouch(0).deltaPosition.y * rotSpeed);
10. trackedRotation.y = Mathf.Clamp(trackedRotation.y, -90f, 90f);
11.                 transform.rotation = Quaternion.AngleAxis(trackedRotation.y, Vector3.left);
12.  }
13. }
14. }

(Apologies for weird indentation, I typed it up in the input box and can't tab.)

You really only need a float for your Y rotation, but I assume at some point you'll probably want to add in X as well, so a Vector2 will let you add that easily.

 

Thank you very much, StarManta! That works exactly as i want it!