Ограничение движения камеры

private bool CameraCanMove(Vector3 deltaPosition)
{
    //implement method logic
    return true;
}

private bool BorderCmaeraMove(Vector3 CameraTR)
    {
        Ray _ray = Camera.main.ScreenPointToRay(new Vector3(Screen.width, Screen.height, 0));
        RaycastHit _hit;
        if (Physics.Raycast(_ray, out _hit, Ground))
        {
 
        }
        Debug.DrawRay(_ray.origin, _ray.direction * 100, Color.yellow);
 
        Ray ray2 = Camera.main.ScreenPointToRay(new Vector3(Screen.width, 0, 0));
        RaycastHit hit2;
        if (Physics.Raycast(ray2, out hit2, Ground))
        {
 
        }
        Debug.DrawRay(ray2.origin, ray2.direction * 100, Color.green);
 
        Ray ray3 = Camera.main.ScreenPointToRay(new Vector3(0, 0, 0));
        RaycastHit hit3;
        if (Physics.Raycast(ray3, out hit3, Ground))
        {
 
        }
        Debug.DrawRay(ray3.origin, ray3.direction * 100, Color.blue);
 
        Ray ray4 = Camera.main.ScreenPointToRay(new Vector3(0, Screen.height, 0));
        RaycastHit hit4;
        if (Physics.Raycast(ray4, out hit4, Ground))
        {
 
        }
        Debug.DrawRay(ray4.origin, ray4.direction * 100, Color.red);
        if (_hit.collider && hit2.collider && hit3.collider && hit4.collider != null)
        {
            return true;
        }
        else
        {
            return false;
        }

Ray _ray = Camera.main.ScreenPointToRay(new Vector3(Screen.width, Screen.height, 0));
_ray.origin += CameraTR;

if (Physics.Raycast(_ray, out _hit, Ground) &&
Physics.Raycast(_ray2, out _hit, Ground) &&
Physics.Raycast(_ray3, out _hit, Ground) &&
Physics.Raycast(_ray4, out _hit, Ground) )
        { return true; }
 else {return false; }

if (BorderCameraMove(someVector))
{
    //move camera...
}

            if (Input.mousePosition.x > Screen.width - 15)
            {
                transform.position += transform.right * Time.deltaTime * CameraScroll;
            }