var obj : GameObject;
var startObjX : float = 0;
var startObjY : float = 0;
var startObjZ : float = 0;
var lineX : float = 5;
var lineZ : float = 4;
var step : float = 3;
var objVector : Vector3;
function Start ()
{
for (var x: int = 0; x < lineX; x++)
{
for (var z: int = 0; z < lineZ; z++)
{
objVector.x = x * step + startObjX;
objVector.z = -z * step + startObjZ;
Instantiate(obj, objVector, Quaternion.identity);
}
}
}

function Update ()
{
transform.Translate(Vector3.forward * Time.deltaTime);
if (transform.position.z > 3)
{
Destroy(gameObject);
}
}