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Question by DeadKenny · Mar 31, 2014 at 07:51 AM · collisionarraynullreferenceexceptionontriggerenterfor

Why is this not working?

I'm trying to find all the gameobjects with a specific tag and then change a variable in the components of them but this code is saying null reference at the last line. This is supposed to happen after a trigger. The trigger works because the debug is showing its working but the for statement isn't.

Code:

 private GameObject[] blocks;
 
 void OnTriggerEnter(Collider col)
 {        
     if(col.tag == "Player")
     {
         Debug.Log("Works");
             
         blocks = GameObject.FindObjectsWithTag("terrain");
             
         for(int t = 0 < blocks.Length; t++)
         {
             //This is where the null reference is coming from.
             blocks[t].GetComponent<TerrainBlock>().stop = true;
                 
         }            
             
     }        
 }
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avatar image moghes · Mar 31, 2014 at 08:04 AM 0
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try to print blocks.Length before the for loop to see if you have any. then you have to be sure that your terrain object is a child and have TerrainBlock component attached.

avatar image MojtabaM · Mar 31, 2014 at 08:06 AM 0
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maybe your tag is Upper-Case or something like this. try with only one object that has tag , so can help to solve it...

avatar image AlucardJay · Mar 31, 2014 at 08:16 AM 0
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also line 14 should only have one = (setting a value to equal something, not using an operator) :

 blocks[t].GetComponent<TerrainBlock>().stop = true;

and as moghes said, either the object(s) tagged terrain doesn't have the component TerrainBlock, or stop is not a (public) variable of the component.

avatar image KEric · Mar 31, 2014 at 08:26 AM 0
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Based on the first tag ("Player") it seems you're starting your tags with an upper-case letter. Change "terrain" to "Terrain" and try it out

avatar image DeadKenny KEric · Mar 31, 2014 at 08:57 AM 0
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Nope... All the tags are right.

avatar image DeadKenny · Mar 31, 2014 at 08:34 AM 0
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Oh yes sorry It is onlu one =. force of habit made me type ==...

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