Need Help Raycasting From Game Objects

Hello!

I'm trying to instantiate an object (object B) on the surface of a plane if another game object (object A) is pointed at that object. I then want object B's transform to mirror the RaycastHit.point as object A translates and thus moves the ray it's casting.

Here is my working script:

Code (CSharp):

1.  
2.     public GameObject crossHairs;
3.     bool crossHairsSpawned;
4.  
5.     void Update ()
6.     {
7.         RaycastHit hit;
8.         Vector3 targetPosition = RaycastHit.point;
9.  
10.         Vector3 forward = transform.TransformDirection (Vector3.forward) * 10;
11.         Debug.DrawRay (transform.position, forward, Color.green);
12.  
13.         if (Physics.Raycast (transform.position, (forward), out hit))
14.         {
15.             if (hit.collider.gameObject.tag == "TargetPlane" && crossHairsSpawned == false)
16.             {
17.                 crossHairsSpawned = true;
18.                 Instantiate (crossHairs, targetPosition, Quaternion.Euler (0, 0, 0));
19.             }
20.  
21.             if (crossHairsSpawned == true)
22.             {
23.                 crossHairs.transform.position = targetPosition;
24.             }
25.         }
26.     }

However Unity is throwing: error CS0120: An object reference is required to access non-static member `UnityEngine.RaycastHit.point'

I looked at the manual and it says to use: Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

I'm not sure this makes sense in my case since the ray is not being cast from the screen but from a game object? How can I make this work. Thanks in advance!

 

That's completely unrelated
This is not the code with the error in it, find that one, that has hit.point in it

 

Thanks. The error message is gone but I'm still fighting this. Here is the new working code:

Code (CSharp):

1. public GameObject crossHair;
2.     public bool crossHairSpawned;
3.  
4.     void Update ()
5.     {
6.         RaycastHit hit;
7.  
8.         Vector3 forward = transform.TransformDirection (Vector3.forward) * 10;
9.         Debug.DrawRay (transform.position, forward, Color.green);
10.  
11.         if (Physics.Raycast (transform.position, (forward), out hit))
12.         {
13.             if (hit.collider.gameObject.tag == "TargetPlane" && crossHairSpawned == false)
14.             {
15.                 crossHairSpawned = true;
16.                 Instantiate (crossHair, hit.point, Quaternion.Euler (90f, 0, 0));
17.             }
18.  
19.             if (crossHairSpawned == true)
20.             {
21.                 crossHair.transform.position = hit.point;
22.             }
23.         }
24.     }

It's not working as I'd hoped. On line 13 I have a condition about the colliding objects tag name, but at runtime it won't instantiate my prefab unless I remove that condition. Also, I need line 21 to update the transform constantly so to move my crosshair allong with the collision point of the raycast and other collider. What am I doing wrong?

Edit: Got the CrossHair to follow the Raycast hit point by doing this:

Code (CSharp):

1. if (crossHairSpawned == true)
2.         {
3.             Physics.Raycast (transform.position, (forward), out hit);
4.             crossHairTransform = hit.point;
5.             GameObject.Find ("CrossHair(Clone)").transform.position = crossHairTransform;
6.         }

But I'm still trying to grok why my tag condition is problematic.

Edit: I see that I'm going to have to use layer masks and not tags.

 

Make sure your tag:

1. actually exists
2. is written exactly like that
3. is assigned to the gameObject

 

Yes 1-3 checked out but it turned out that layers and/or tags were not what I needed to be working with.

I needed the raycast line to pass through all but one object in the scene. I solved this by checking "Ignore Raycasting" on the relevant objects, though I would have preferred to do it through code somehow. In any case, problem solved.

 

Don't do that, later if you need to hit those objects with raycast, then you'll be in trouble, you need to use layers
https://www.google.hu/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=raycast ignore layer