Spacing objects out when instantiated using variables.

Questions & Answers
1

I had trouble with a script earlier that was supposed to spawn an increasing amount of objects. Now the script is almost finished but now I’m having a different problem.
From the documentation on instantiating objects there was a method in there that spaced out the objects. namely this:

for(var w : int = 0; w < 10; w++)
		{
		Instantiate(prefab, Vector3(w * 2, 0, 0), Quaternion.identity);
		}

now in my code I have replaced vector 3 with a variable but unity doesn’t seem to like this.

var wave_number = 0;
var wave_text : GUIText;
var wave_amount = 5;
var background_timer = 0;
var wave : boolean;
var prefab : Transform;
var spawnpoint : Transform;
private var spawnpoint_location : Vector3;

function Start () {
}

function Update () {
background_timer = Time.time % 11;
	if(background_timer == 10)
	{
	wave = true;
	Invoke("New_Wave", 1);
	}
}

function New_Wave () {
	if(wave)
	{
	spawnpoint_location = spawnpoint.position;
	wave_number++;
	wave_amount += 5;
	Debug.Log("Wave number is " + wave_number.ToString() + ". " + "There are " + wave_amount.ToString() + " enemies.");
	wave = false;
	wave_text.text = ("Wave " + wave_number.ToString() );
		for(var w : int = 0; w < wave_amount; w++)
		{
		Instantiate(prefab, spawnpoint_location(w * 2, 0, w * 2), Quaternion.identity);
		}
	}

}

With the above code I get this error:

Assets/Scripts/wave_spawner.js(35,37): BCE0077: It is not possible to invoke an expression of type ‘UnityEngine.Vector3’.

And removing the part in the loop that spawns the NPCs in a spaced fashion gets rid of the error, but when they instantiate they are all on top of each other.

My question is, how can I space the objects out while keeping the location as a variable (with which I can place a GameObject in to manually set a spawn point)?

2

Calculate spawnpoint_location each iteration, like this:

   for(var w : int = 0; w < wave_amount; w++)
   {
   spawnpoint_location = spawnpoint.position + Vector3(w * 2, 0, w * 2); 
   Instantiate(prefab, spawnpoint_location, Quaternion.identity);
   }