Drag and Drop tagged object only C#

Hi all,

I'm using the following drag and drop script- which works perfectly fine.
What I'd like to do is modify it so it only works with a particular tagged object.
I tried replacing line:

target = hit.rigidbody.gameObject;

with

target = hit.rigidbody.gameObject.tag."test";

But it won't work. Any ideas how I can make this script only recognize this tagged object?

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. public class DragAndDrop : MonoBehaviour
4. {
5.     private bool _mouseState;
6.     private GameObject target;
7.     public Vector3 screenSpace;
8.     public Vector3 offset;
9.     // Use this for initialization
10.     void Start ()
11.     {
12.  
13.     }
14.  
15.     // Update is called once per frame
16.     void Update ()
17.     {
18.         // Debug.Log(_mouseState);
19.         if (Input.GetMouseButtonDown (0)) {
20.             RaycastHit hitInfo;
21.             target = GetClickedObject (out hitInfo);
22.             if (target != null) {
23.                 _mouseState = true;
24.                 screenSpace = Camera.main.WorldToScreenPoint (target.transform.position);
25.                 offset = target.transform.position - Camera.main.ScreenToWorldPoint (new Vector3 (Input.mousePosition.x, Input.mousePosition.y, screenSpace.z));
26.             }
27.         }
28.         if (Input.GetMouseButtonUp (0)) {
29.             _mouseState = false;
30.         }
31.         if (_mouseState) {
32.             //keep track of the mouse position
33.             var curScreenSpace = new Vector3 (Input.mousePosition.x, Input.mousePosition.y, screenSpace.z);
34.             //convert the screen mouse position to world point and adjust with offset
35.             var curPosition = Camera.main.ScreenToWorldPoint (curScreenSpace) + offset;
36.             //update the position of the object in the world
37.             target.transform.position = curPosition;
38.         }
39.     }
40.  
41.  
42.     GameObject GetClickedObject (out RaycastHit hit)
43.     {
44.         GameObject target = null;
45.         Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
46.         if (Physics.Raycast (ray.origin, ray.direction * 10, out hit)) {
47.             target = hit.rigidbody.gameObject;
48.            
49.                                
50.         }
51.         return target;
52.     }
53. }

 

Just tried to use:

target = hit.rigidbody.GameObject.FindWithTag("test");

instead of:

target = hit.rigidbody.gameObject.tag."test";

Didn't seem to work either.

Any ideas?

 

Think about what you were trying to do - target = hit.rigidbody.gameObject.tag."test" doesn't make any sense. So much so that it shows a complete lack of basic programming knowledge; I would therefore highly suggest that you do some basic programming tutorials first, before getting started with Unity. It will save you so much time and frustration if you actually know what you're doing.

To answer your question though, Physics.Raycast() has an overload which allows you to filter using a layer mask.

Code (CSharp):

1. if (Physics.Raycast (ray.origin, ray.direction * 10, out hit, Mathf.Infinity, LayerMask.GetMask("test"))) {}

 

Perfect, thanks for your help, Thomas!
You got the tutorial suggestion right too