hahahaha

var prefab : GameObject;
var gridX = 5;
var gridY = 5;
var gridZ = 5;
var spacing = 1;

function Start ()
{
for (var y = 0; y < gridY; y++){
for (var x = 0; x < gridX; x++){
for (var z = 0; z < gridZ; z++){

var pos = Vector3(x,y,z) * spacing;
Instantiate(prefab, pos, Quaternion.identity);



}
}
}
}