Two objects are placed at the same place. How to destroy one and keep another?

Questions & Answers
1

I am sorry to ask a question without even a draft of a script, but…

If I have two prefabs placed roughly at the same point, so parts of them intersect, how can I always destroy object a and keep object b?
Probably I should use the collisions or something like that, but I just can’t figure out the exact algorithm.
It is not a bug, but a free generating space, so I have problems controlling what appears where, so I am trying to find/make a script to prevent these cases.

This is the script I use to spawn objects.
I just use it again, changing the z value to have +10 always.

var Xvalue:float = 0.0;
var Zvalue:float = 0.0;
var ChangeCounter:int = 1.0;
var ChangeAmount:float = 20.0;
var Technical_Couter:int = 1.0;
var PlayFieldSize:float = 0.0;
var prefab1:Transform;



function Update () 
{
    if(ChangeCounter<PlayFieldSize)
       {
       Xvalue=(ChangeAmount*ChangeCounter);
       Instantiate (prefab1, Vector3(Xvalue, 0.0, 0.0), Quaternion.identity);


    if(ChangeCounter>0)
    {
       while(Technical_Couter<(ChangeCounter+1))
         {
         Zvalue=(ChangeAmount*Technical_Couter);
         Instantiate (prefab1, Vector3(Xvalue, 0.0, Zvalue), Quaternion.identity);
         Technical_Couter++;
         }

       while(Xvalue>0)
       {
         Xvalue=(Xvalue-ChangeAmount);
         Instantiate (prefab1, Vector3(Xvalue, 0.0, Zvalue), Quaternion.identity);
       }
    }
       ChangeCounter++;
       Technical_Couter=1.0;
       }
}

Also, the spawned prefab in its turn spawns one of a few prefabs at its place.

So I need to check, if the prefab at the bottom layer is too high, and collides with a prefab at the top layer, and if so, destroy the one on the top.

2

I’m guessing you generate objects by doing something like this:

Instantiate (someObject, somePosition, someRotation);

and then don’t keep track of that new object.

Keep track of it.

You could use a List for example:

var objList : List = new List();

var newGO = Intantiate (someObject.... 
objList.Push (newGO);

or something like that. Then you can look for objects using the objList list.