Freezing Y axis for drag and drop script

Hello everyone, can anyone explain how to freeze the move for Y axis in this script?

Code (CSharp):

1. private GameObject target;
2.     private bool isMouseDragging;
3.     private Vector3 screenPosition;
4.     private Vector3 offset;
5.  
6.     GameObject ReturnClickedObject(out RaycastHit hit)
7.     {
8.         GameObject targetObject = null;
9.         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
10.         if (Physics.Raycast(ray.origin, ray.direction * 10, out hit) && (hit.collider.tag == "Draggable"))
11.         {
12.             targetObject = hit.collider.gameObject;
13.         }
14.         return targetObject;
15.     }
16.  
17.     void Update()
18.     {
19.         if (Input.GetMouseButtonDown(0))
20.         {
21.             RaycastHit hitInfo;
22.             target = ReturnClickedObject(out hitInfo);
23.             if (target != null)
24.             {
25.                 target.transform.position = new Vector3(target.transform.position.x, -6f, target.transform.position.z);
26.                 isMouseDragging = true;
27.                 Debug.Log("our target position :" + target.transform.position);
28.                 //Here we Convert world position to screen position.
29.                 screenPosition = Camera.main.WorldToScreenPoint(target.transform.position);
30.                 offset = target.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPosition.z));
31.             }
32.         }
33.  
34.         if (Input.GetMouseButtonUp(0))
35.         {
36.             isMouseDragging = false;
37.             target.transform.position = new Vector3(2.5f, -6f, 40f);
38.         }
39.  
40.         if (isMouseDragging)
41.         {
42.             //tracking mouse position.
43.             Vector3 currentScreenSpace = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPosition.z);
44.  
45.  
46.             //convert screen position to world position with offset changes.
47.             Vector3 currentPosition = Camera.main.ScreenToWorldPoint(currentScreenSpace) + offset;
48.             Debug.Log("camera" + Camera.main.ScreenToWorldPoint(currentScreenSpace));
49.             Debug.Log("offset" + offset);
50.  
51.             //It will update target gameobject's current postion.
52.             target.transform.position = currentPosition;
53.         }
54.  
55.     }

 

Before line 52 you can set the

currentPosition.y

field equal to whatever you like.

If you need to choose what to set it to, perhaps you should copy the

y

position to a member variable at the moment you want to freeze it, such as when the mouse goes down.

 

Thanks sir