Want to apply "height" to my DeadSpace Camera --> Physics.Linecast gives me trouble

public class Camera_DeadSpace : MonoBehaviour {

public Transform target;

public float distance = 2.0f; public float height = 0.8f;

public float in_damping = 6.0f; public float out_damping = 3.0f;

public float sensitivityX = 150F; public float sensitivityY = 150F; public float minimumY = -60F; public float maximumY = 60F;

public float minDistance = 0.0f; public float maxDistance = 4.0f; public float smooth = 10.0f;

private bool showCrosshair = false; private GUISkin skin = null; private float rotationY = 0F; private float rotationX = 0F; private float currentDistance;

void Awake(){ currentDistance = distance; }

// Update is called once per frame void LateUpdate () { Screen.showCursor = false; Screen.lockCursor = true;

 Vector3 position = target.position;

//HERE IS THE PROBLEM !!! IF YOU USE THIS LINE IT KILLS THE SCRIPT!!! //position.y = height + target.position.y;

 Vector3 transpos, targetrot;
 Quaternion transrot;


 if (!Input.GetButton("Aim")){
     showCrosshair=true;
     float wantedDistance = distance;

     currentDistance = Mathf.Lerp (currentDistance, wantedDistance, out_damping * Time.deltaTime);

     rotationX += Input.GetAxis("Mouse X") * sensitivityX * Time.deltaTime;
     rotationY -= Input.GetAxis("Mouse Y") * sensitivityY * Time.deltaTime;
     rotationY = Mathf.Clamp (rotationY, minimumY, maximumY);


     transrot = Quaternion.Euler(rotationY, rotationX, 0) ;
     transpos = (Quaternion.Euler(rotationY, rotationX, 0)) * new Vector3(0.0f, 0.0f, -currentDistance) + position;

     targetrot = new Vector3(0, rotationX, 0);
 }
 else{
     showCrosshair=true;
     float wantedDistance = 0;

     currentDistance = Mathf.Lerp (currentDistance, wantedDistance, in_damping * Time.deltaTime);

     rotationX = transform.localEulerAngles.y + Input.GetAxis("Mouse X") * sensitivityX * Time.deltaTime;
     rotationY -= Input.GetAxis("Mouse Y") * sensitivityY * Time.deltaTime;
     rotationY = Mathf.Clamp (rotationY, minimumY, maximumY);

     transrot = Quaternion.Euler(rotationY, rotationX, 0) ;
     transpos = (Quaternion.Euler(rotationY, rotationX, 0))  * new Vector3(0.0f, 0.0f, -currentDistance) + position;

     targetrot = new Vector3(0, rotationX, 0);
 }

 Vector3 desiredCameraPos = transpos;

 RaycastHit hit;
 //float distance2 = 0;

 if( Physics.Linecast( position, desiredCameraPos, out hit ) ){
     print("hit " + hit.distance);
     transpos = (Quaternion.Euler(rotationY, rotationX, 0))  * new Vector3(0.0f, 0.0f, -hit.distance)  + position;
 }

 transform.rotation = transrot;
 transform.position = transpos;
 target.localEulerAngles = targetrot;

}

// Use this for initialization void Start () {