Multiple Instantiations / array add destroy

Unity Engine
1

Hi,

If I’m using an array, say:

private var maxNumberOfSeeds : int = 10;
private var SeedsPool : Array = new Array ();

and trying to instantiate it:

private var i : int = 0;
function PD() {
var wPosA = self.position + Vector3(-20,0,0) + Vector3(i * 2.0,0,0);
var wPosB = self.position + Vector3(2,0,0) + Vector3(i * 2.0,0,0);
var wPosC = self.position + Vector3(0,0,2) + Vector3(0,0,i * 2.0);
var wPosD = self.position + Vector3(0,0,-2) + Vector3(0,0,-i * 2.0);

//instantiate pool
if (SeedsPool.length < maxNumberOfSeeds) {
i ++;
	SeedsPool.Add(Instantiate(plantSeed, wPosA, Quaternion.identity));
	SeedsPool.Add(Instantiate(plantSeed, wPosB, Quaternion.identity));
	SeedsPool.Add(Instantiate(plantSeed, wPosC, Quaternion.identity));
	SeedsPool.Add(Instantiate(plantSeed, wPosD, Quaternion.identity));
}

//reset instantiation pool
if (i >= 10){
i = 0;
}

//clear instantiation pool
if(SeedsPool.length > maxNumberOfSeeds) { 
Destroy(SeedsPool[0]); 
SeedsPool.Shift(); 
}
}

I get the error:
Can’t destroy Transform component. If you want to destroy the game object please call ‘Destroy’ on the game object instead. Destroying the transform component is not allowed.

If, however, I only use one “SeedsPool.Add(Instantiate…)” it’ll work without error.

Any ideas without having to create 4+ arrays?

Cheers.

2

Your array SeedsPool is apparently an Array of Transforms. To destroy the gameObject of the transform, do this:

 Destroy(SeedsPool[0].gameObject );
3

Which returns the error:
BCE0019: ‘gameObject’ is not a member of ‘Object’.

4

the problem with JS Array class is that it’s type is defined as Object, which isn’t really helpfull. You actually should avoid using Array() and try to use a built-in array, which is also better for performance. So do this:

 private var SeedsPool : Transform[];

Note that this is a static array, so you can’t adjust it’s size by using Add(), I use C# and the System.Collections.Generic.List<> is a fast type defined version of the JavaScript Array() class.

Are you using JS for a very long time or have you just started scripting?
If you just started or don’t mind switching to C#, I would highly recommend it

5

I suppose I’ll just approach it in another way, or see if Lists will do.

I’ve been using JS for a while, and have even converted some C# references/examples back to JS for my purposes but in no way am I great with C#. I understand that it’s a better language, and it’s purposes in and outside of Unity. Perhaps in the near future I’ll delve into it.

6

I haven’t done alot with JS, since I’ve heard there were some bad things about it compared to C# (like this) when I dived into programming. The syntax is almost the same as JS and it will give you a better picture of what is actually going on than JS.

7

D’oh

I can see why the problem occured when I added those other three instantiations, I must’ve also edited the prefab variable -

var plantSeed : Transform;

should be

var plantSeed : GameObject;

Thus fixing the Destroy issue.