Spawn a defined number of enemies at each of 3 locations, with a delay between each enemy?

Unity Engine
1

I’ve tried Coroutine (breaks somehow and never stops spawning. And I’ve tried InvokeRepeating but cant pass the transform param. for the location. Any suggestions be great.

void SpawnMinions()
    {
        foreach(Transform t in spawnPoints)
        {
            SpawnMinion(t);
        }
        print(enemyCount);
        spawnTimer = Time.time + spawnDelay;
    }
    private void Update()
    {
        if(Time.time >= spawnTimer)
        {
            SpawnMinions();
        }
    }
    void SpawnMinion(Transform spawnPoint)
    {
        for(int i = 0; i < numberToSpawn; i++)
        {
            Instantiate(minion, spawnPoint.position, Quaternion.Euler(0, 0, 0));
            // I need a delay here, before the next spawn.(will give the minion time to move before next spawns)
        }
    }
2 
void Start()
{
  for( int i = 0; i < spawnPoints.Length; i++ )
  {
    StartCoroutine( SpawnMinion( spawnPoints[i] ) ); // Starts 1 coroutine for each spawn point
  }
}

IEnumerator SpawnMinion( Transform spawnPoint )
{
  for( int i = 0; i < numberToSpawn; i++)
  {
     Instantiate(minion, spawnPoint.position, Quaternion.Euler(0, 0, 0));
     yield return new WaitForSeconds(spawnDelay); // yields this coroutine for spawnDelay game time
  }
}
3

Doesn’t work, like I said Coroutine breaks it so they just keep spawning over and over. I cant call the coroutine in start, has to be in a if statement that checks the timer in the update. your example just spawns one wave and that’s it. That’s not a fun moba

4

I got it to work using this.

public class BaseController : MonoBehaviour
{
    GameObject minion;
    float waveTimer = 0f; //  timer that tells base when to spawn enemies.
    float spawnDelay = .5f; // delay between each enemy spawn.
    float waveDelay = 60f; // delay between each wave.
    int numberToSpawn = 10;
    int enemyCount = 0;
    List<Transform> spawnPoints = new List<Transform>();


    private void Awake()
    {
        spawnPoints.Add(transform.Find("BaseSpawn1"));
        spawnPoints.Add(transform.Find("BaseSpawn2"));
        spawnPoints.Add(transform.Find("BaseSpawn3"));
        minion = Resources.Load("Prefabs/Enemy/Minion") as GameObject;
    }

    private void Update()
    {
        if(Time.time >= waveTimer)
        {
            for (int i = 0; i < spawnPoints.Count; i++)
            {
                StartCoroutine(SpawnMinion(spawnPoints[i])); // Starts 1 coroutine for each spawn point
              
            }
            waveTimer = Time.time + waveDelay;         
        }
    }

    IEnumerator SpawnMinion(Transform spawnPoint)
    {
        for (int i = 0; i < numberToSpawn; i++)
        {
            Instantiate(minion, spawnPoint.position, Quaternion.Euler(0, 0, 0));
            yield return new WaitForSeconds(spawnDelay); // yields this coroutine for spawnDelay game time
        }
    }
}

Used your example, My’n would of worked, the first time I used a coroutine, but I forgot to initialize the WaveDelay, so it stayed at zero and kept the coroutine going constantly.