Question by G_Robaina · Oct 21, 2021 at 12:24 AM · c#rotation quaternion

Clamp a rotation in unity

I have this code but I have not been able to find a decent solution to clamp the X axis between 2 angle values. How would it be done in this case?

 public class CameraController : MonoBehaviour {
     public float cameraSmoothness = 5f;
 
     private Quaternion targetGlobalRotation;
     private Quaternion targetLocalRotation = Quaternion.Identity;
 
     private void Start(){
         targetGlobalRotation = transform.rotation;
     }
 
     private void Update(){
         targetGlobalRotation *= Quaternion.Euler(
             Vector3.up * Input.GetAxis("Mouse X"));
         
         targetLocalRotation *= Quaternion.Euler(
             Vector3.right * -Input.GetAxis("Mouse Y"));
 
         transform.rotation = Quaternion.Lerp(
             transform.rotation,
             targetGlobalRotation * targetLocalRotation,
             cameraSmoothness * Time.deltaTime);
     }
 }

Add comment · Show 2

andrew-lukasik · Oct 21, 2021 at 08:07 AM 1

You're working with angles, not quaternions here. Since that is the case, you can just map mouse input to specific angles

 public class CameraController : MonoBehaviour
 {
     [SerializeField] float _cameraSmoothness = 5f;
     [SerializeField] Vector2 _horizontalRange = new Vector2( -60 , 60 );
     [SerializeField] Vector2 _verticalRange = new Vector2( -30 , 30 );
     float _horizontal, _vertical;
     void Update ()
     {
         _horizontal = Mathf.Clamp( _horizontal + Input.GetAxis("Mouse X")*0.05f , -1f , 1f );
         _vertical = Mathf.Clamp( _vertical - Input.GetAxis("Mouse Y")*0.05f , -1f , 1f );
         var h = Quaternion.Euler( 0 , Mathf.Lerp( _horizontalRange.x , _horizontalRange.y , (1f+_horizontal)*0.5f ) , 0 );
         var v = Quaternion.Euler( Mathf.Lerp( _verticalRange.x , _verticalRange.y , (1f+_vertical)*0.5f ) , 0 , 0 );
         transform.localRotation = Quaternion.Slerp( transform.localRotation , h * v , _cameraSmoothness * Time.deltaTime );
     }
 }