Collision Detection

Question

I'm trying to detect what object my character is colliding with. My simple block of code is always giving me "null" back.

 function OnCollisonEnter (theCollision : Collision)
 {
 
     /*if(theCollision.CompareTag == "Floor")
         {
                grounded = true;// Sets grounded variable to true.
             //Debug.Log(theCollision.tag); 
         }
     */
     
     print(theCollision);
     
 }

As you can see the end result would be to detect to tag and use that but it doesn't even seem to be dectecting what object it collides with. I'm using a rigidbody on cube hitting another cube. I'm super new but any help would be greatly appreciated.

Answer 1

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Answer by DryTear · Feb 26, 2013 at 12:39 AM

 private var objectCollided : string;

 function OnCollisionEnter(objectCollided : Collision)
 {
     //if(objectCollided.gameObject.tag == "BlaBla")
     //{
         //Do Something
     //}
     //print(objectCollided.gameObject.tag);
     //Debug.Log(objectCollided.gameObject.tag);
 }
 
 function OnGUI()
 {
     GUILayout.Label(Rect(Screen.width/2, Screen.heigth/2,0,0), "Collided With "+objectCollided);
 }

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Myull · Feb 27, 2013 at 03:37 AM 0

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Thanks man!! that did it!

DryTear · Feb 27, 2013 at 05:59 PM 0

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you welcome!

Answer 2

Answer by AutoFredrik · Feb 24, 2013 at 10:56 AM

"theCollision" stores collision data, not the actual object you collided with. As Coreyf716 said you need to use Debug.Log(theCollision.collider.tag); to get the tag of the object you collided with. Also, I think you're using CompareTag wrong. Try if(theCollision.collider.CompareTag("Floor")). Once again, you were trying to get the tag of the collision data, not the object you collided with. This stuff can be a bit confusing if you're new. :) I think this should work. Good luck!

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Myull · Feb 24, 2013 at 05:35 PM 0

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Thanks, When I do that I get this error:

NullReferenceException: Object reference not set to an instance of an object Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.String cache$$anonymous$$eyName, System.Type[] cache$$anonymous$$eyTypes, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory) Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.Object[] args, System.String cache$$anonymous$$eyName, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory)

Which was getting before when i had it as if(theCollision.tag = "Floor") (or a number of other ways I tried)

Collision Detection

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