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Question by mmischitelli · Jan 05, 2012 at 03:29 PM · gameobjectinstantiateprefabnullreferenceexception

Referencing gameObject from script after Instantiate

I've created a prefab which contains both a valid mesh and a javascript. In the javascript (jsInstantiatedObj) I have something like this:

 function GoRight(){
    iTween.MoveBy(gameObject, [just parameters..]);
 }

I then instantiate a few of those in an empty GameObject, let's call it ObjMgr. Inside ObjMgr's javascript I do something like this:

 function MoveEverythingToTheRight(){
    var types = GameObject.FindGameObjectsWithTag("myValidTag");
    for(var go : GameObject in types)
       go.GetComponent(jsInstantiatedObj).MoveRight();
 }

But at runtime I receive a: NullReferenceException: Object reference not set to an instance of an object Which is being thrown by the jsInstantiateObj script when trying to access gameObject. If, instead of calling jsInstantiateObj.MoveRight(), I write exactly what should be executed in the method, I have no problems at all.

Do you know why can't I access gameObject from the script attatched to the instantiated prefab? Thanks!

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avatar image Jake-L · Jan 05, 2012 at 04:29 PM 0
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Just an idea: When does your managerscript gather it's managed objects? Check calling FindGameObjectsWithTag in Start() to ensure all sub-objects are already loaded.

avatar image by0log1c · Jan 05, 2012 at 05:13 PM 0
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Not actually an answer, but is it on purpose that the example has the GoRight() function and that you're calling $$anonymous$$oveRight() on it?

avatar image luizgpa · Jan 05, 2012 at 06:21 PM 1
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Just checking, are you sure that the gameObject property is the one throwing the exception, not some internal code of iTween.$$anonymous$$oveBy? To test you could do something like:

var go = gameObject;

iTween.$$anonymous$$oveBy(go, [just parameters..]);

...

avatar image mmischitelli · Jan 13, 2012 at 08:14 AM 0
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Thanks Luiz, it worked ;)

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