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Question by Libelnon · May 09, 2013 at 06:57 PM · gameobjectcollidernullreferenceexception

NullReferenceException from transform.parent.gameObject

The following code is being used in an RTS style game to detect when a unit comes within a certain distance of a crate to allow them to 'pick up' objects. However, every time a unit enters the collider around the object the script is attached to, it merely throws up a NullReferenceException and nothing happens (the message sent out should stop the light attached to the object and destroy it).

 using UnityEngine;
 using System.Collections;
 
 public class PickupOnCollider : MonoBehaviour {
 
     void OnTriggerEnter (Collider other)
     {
     GameObject enteringObject = other.transform.parent.gameObject;
         Debug.Log("Object entering collider...");
         if (enteringObject.light != null)
         {
             if (enteringObject.light.tag == "Allied")
             {    
                 BroadcastMessage("OnPickup");
                 Debug.Log("Item picked up.");
             }
         }
     }
 }
 
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Answer by whydoidoit · May 09, 2013 at 06:58 PM

I presume that not everything that enters this trigger has a parent? Are they just top level objects?

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avatar image Libelnon · May 09, 2013 at 07:40 PM 0
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Yeah, I suppose the object is top-level. Hmm. How would I be able to access the gameObject then using the collider?

avatar image whydoidoit · May 11, 2013 at 07:49 AM 0
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Just:

 other.gameObject

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