Hi,
My code is pretty much exactly the same as in the video, besides a few changes in variable names.
What I’m observing is this:
Before I prepared and implemented the SpawnUntilFull function, everything was working as shown in the video.
However, once I replaced EnemySpawner with SpawnUntilFull in Start and AllMembersDead, the enemy ground would either get stuck or start jittering at a certain point in the play space.
I changed my camera size, and I can move the player controller from end to end, but the EnemyFormation only moves to X = Around 4, and Y = 1.37 from origin point.
While testing different things, I found that if I changed the direction of the movingRight, they would simply continue moving left and not rebound and move back and forth. The enemies properly moved back and forth ONLY if I make them move right FIRST.
Here’s my code:
<using UnityEngine;
using System.Collections;
public class FormationController : MonoBehaviour {
public GameObject enemyPrefab;
public float width;
public float height;
float spawnerxMin;
float spawnerxMax;
public float spawnerSpeed;
public float spawnDelay = 0.5f;
private bool movingRight = true;
// Use this for initialization
void Start () {
SpawnUntilFull();
}
public void EnemySpawner() {
foreach( Transform child in transform) {
//here the just 'transform' is our transform, which is the enemy formation
//so now the enemy has the same transform as the parent - the enemy instance is now childed
//instead of the putting the parent of the enemy to be myself(spawner), make the parent my child(position)
GameObject enemy = Instantiate(enemyPrefab, child.transform.position, Quaternion.identity) as GameObject;
enemy.transform.parent = child;
//initialization for the boundaries by camera view for the Spawner
float distance = transform.position.z - Camera.main.transform.position.z;
Vector3 leftmost = Camera.main.ViewportToWorldPoint(new Vector3(0, 0, distance));
Vector3 rightmost = Camera.main.ViewportToWorldPoint(new Vector3(1, 0, distance));
spawnerxMin = leftmost.x;
spawnerxMax = rightmost.x;
}
}
void SpawnUntilFull() {
Transform freePosition = NextFreePosition();
if (freePosition){
GameObject enemy = Instantiate(enemyPrefab, freePosition.position, Quaternion.identity) as GameObject;
enemy.transform.parent = freePosition;
}
if (NextFreePosition()) {
Invoke ("SpawnUntilFull", spawnDelay);
}
}
public void OnDrawGizmos() {
Gizmos.DrawWireCube(transform.position, new Vector3(width, height));
}
// Update is called once per frame
void Update () {
//Moving the spawner left and right
if (movingRight){
transform.position += Vector3.right * spawnerSpeed * Time.deltaTime;
} else {
transform.position += Vector3.left * spawnerSpeed * Time.deltaTime;
}
//Constrain to playfield
float rightEdgeofFormation = transform.position.x + (0.5f*width);
float leftEdgeofFormation = transform.position.x - (0.5f*width);
if (leftEdgeofFormation < spawnerxMin) {
movingRight = true;
} else if (rightEdgeofFormation > spawnerxMax) {
movingRight = false;
}
if (AllMembersDead()){
Debug.Log("Empty Formation");
SpawnUntilFull();
Debug.Log("New Formation spawned");
}
}
Transform NextFreePosition() {
foreach(Transform childPositionGameObject in transform){
if (childPositionGameObject.childCount == 0) {
return childPositionGameObject;
}
}
return null;
}
bool AllMembersDead () {
foreach(Transform childPositionGameObject in transform){
if (childPositionGameObject.childCount > 0) {
return false;
}
}
return true;
}
}
Right now, I’m able to make it work by not putting SpawnUntilFull in Start and instead have EnemySpawner as usual in start. Then when I kill the enemies they spawn as expected one by one. Really getting confused now 
