Raycast Distance Help

Question

 function Update () { 
 var fwd = transform.TransformDirection(Vector3.forward); 
 var $$anonymous$$t : RaycastHit; 
 }

Here I have a raycast on object that will try to detect objects in front of it. If there is an object then take the distance ($$anonymous$$t.distance) and change it into a int variable. (In Javascript)

So basically:

 var dis : int = $$anonymous$$t.distance

However for some reason it represents dis as 0.

Answer 1

Best Answer

Answer by redeemer · May 18, 2015 at 11:09 AM

Acording to your code, you're not actually raycasting anyt$$anonymous$$ng, but only declaring the variables to do so.

Try t$$anonymous$$s :

     function Update () {

             var rayLength = 10;
             var $$anonymous$$t : RaycastHit;
             var fwd = transform.TransformDirection (Vector3.forward);
         if (Physics.Raycast (transform.position, fwd, $$anonymous$$t, rayLength)) {
                     print ("Hit Distance : " + $$anonymous$$t.distance);
         }
     }

You should read t$$anonymous$$s too http://docs.unity3d.com/ScriptReference/Physics.Raycast.html.

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RoomofR · May 18, 2015 at 05:43 PM 0

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I have this: function Update () { var fwd = transform.TransformDirection(Vector3.forward); var hit : RaycastHit; var dis : float = hit.distance;

     if (Physics.Raycast(transform.position, fwd, hit)){//IF I HIT SOMETHING
         print (dis); //Equals to 0 all the time
         print (hit.distance); //If equals to 8
     }
 }

redeemer · May 18, 2015 at 06:06 PM 1

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You are trying to assign the hit.distance before it's populated, what surprises me is the fact that you get 0 instead of null. Anyway, your code should be something like the above I already posted.

You also need to multiply your forward vector times the distance you want to cast. The forward, up or right vector are unitary, they only indicate the "direction" and always have a value of one. SO if you don't multiply it, you will be casting only 1 meter from you original pos.

Try the following, it should work :

     function Update () { 
     
     var fwd = transform.TransformDirection(Vector3.forward); 
     var hit : RaycastHit; 
     var rayLength = 10;
     
          if (Physics.Raycast(transform.position, fwd * rayLength, hit)){//IF I HIT SOMETHING
              var dis : float = hit.distance;
              print (dis); //Equals to 0 all the time
              print (hit.distance); //If equals to 8
          }
      }

I know it's kinda obvious, but just in case, be sure the object you want to detect have a collider and it's not set to trigger.

RoomofR · May 19, 2015 at 05:28 PM 0

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Thanks it works :D

Raycast Distance Help

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