✅ C# unity rotation clamping.

// private void Update()
    {

        Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        mousePos.z = 0f;

        Vector3 aimDirection = (mousePos - transform.position).normalized;
        

        if(changeDirection.x == -1)
        {
            angle = (Mathf.Atan2(aimDirection.y, aimDirection.x) * Mathf.Rad2Deg - 180f);
            angle = Mathf.Clamp(angle, -90f, 90f);
            print(angle);
        }
        else if(changeDirection.x == 1)
        {
            angle = (Mathf.Atan2(aimDirection.y, aimDirection.x) * Mathf.Rad2Deg);
            angle = Mathf.Clamp(angle, -90f, 90f);
            //print(Mathf.Rad2Deg);
        }

        zAngle = new Vector3(0, 0, angle);
        transform.eulerAngles = zAngle;
    }