Raycast not finding tag (JavaScript)

Unity Engine
1

So I know this is probably a question with a super easy fix, but I am tired of trying to figure it out. I am trying to cast a ray from the mouse, which I have succeeded in doing (I am very new to raycast!) but for some reason, even though this fix worked for someone else, It does not work for me.
The code:

#pragma strict
    function Update () {
        if (Input.GetButtonDown ("Fire1")) {
            // Construct a ray from the current mouse coordinates
            var hit : RaycastHit;
            var ray : Ray = Camera.main.ScreenPointToRay (Input.mousePosition);
            if (Physics.Raycast (ray)) {
                if (hit.collider.tag == "TestBlock")
                {
                    Debug.Log("RaycastWorks");
                }
            
        }
    }
}

I am getting the error of: NullReferenceException: Object reference not set to an instance of an object

Thanks in advance for any answers!

2

You seem to be missing a few arguments.

        if(Physics.Raycast(ray.origin, dir, out hit, RollerLayerMask)){   
              spinBall_(hit.point);
          }
3

renman’s signature brand of not-really-knowing ?

You can manage with a single argument, but OP probably needs ray and hit

4

so exactly what are you saying hpjohn? ::)((:?)( :stuck_out_tongue:

5

Yes, basically, you declared hit, but never used it in the Raycast statement, so it didn’t have a value.

6 
#pragma strict
    function Update () {
        if (Input.GetButtonDown ("Fire1")) {
            // Construct a ray from the current mouse coordinates
            var hit : RaycastHit;
            var distance : float = 100;
            var ray : Ray = Camera.main.ScreenPointToRay (Input.mousePosition);
            if (Physics.Raycast (ray, hit , distance)) {
                if (hit.collider.tag == "TestBlock")
                {
                    Debug.Log("RaycastWorks");
                }
          
        }
    }
}

The problem with your previous code was that you are trying to get the tag of the object hit by the raycast but the fact that
it was empty caused an error ( NullErrorException ) . Simply fix this by using the correct overload for Physics Raycast that asks for a RaycastHit parameter with the other parameters you wanted. I have provided the solution as stated above. Hope it helps.

7

Thanks for all of your help guys! I appreciate it very much!