Spawn waves & wait till it's killed, spawn again.

Question

Hey, I want to make wave spawning script. I don't want to just spawn waves in the loop because after some time there will be 9999 enemies. I want to spawn a wave of monsters and wait till player kills them then spawn next wave. I was thinking about making a list of enemies, add enemies to it and when it's empty then spawn another wave. The problem is I have 3 enemies and player would have to kill all three of them at once to spawn another wave? I wanted to start the coroutine in an update function. Also I wanted to ask if I can add GAMEOBJECTS to the list if they ARE NOT on the scene? The code would look like this:

 public GameObject Enemy1;
 public GameObject Enemy2;
 public GameObject Enemy3;
 
 public Vector3 spawner1Pos = new Vector3(-36.5f, 3.67f, 88.2f);
 public List<GameObject> enemies = new List<GameObject>();
 
 private void Start()
 {
       enemies.Add(Enemy1);
       enemies.Add(Enemy2);
       enemies.Add(Enemy3);
 }
 
 private void Update()
 {
       if(enemies.Count == 0)
       {
               for(int i = 0; i < 3; i++)
               {
               Instantiate(Enemy1, spawner1Pos, Quaternion.identity);
               }
       }
 }

It's just an example code but it would look like this.

Answer 1

Here is an idea with a singleton spawn manager. Just use it for some reference, but basically, when an enemy dies, you send a notification into the manager. The manager will determine when to spawn more. It also spawns the first wave of enemies too. Should give you some ideas.

 // Place in your scene somewhere
     public class SpawnManager : MonoBehaviour
     {
         // Singleton
         static SpawnManager instance;
         public SpawnManager Instance
         {
             get
             {
                 if (instance == null)
                 {
                     instance = FindObjectOfType<SpawnManager>();
                 }
 
                 return instance;
             }
         }
 
         [SerializeField] GameObject enemyPrefab;    // Link the enemy prefab to make clones of -- this could be a list of prefabs that you randomly choose from
         [SerializeField] int spawnCount = 5;        // as many as you want
 
         int currentEnemyCount;
 
         // Our property will take care of spawning as it decrements
         public int CurrentEnemyCount
         {
             get { return currentEnemyCount; }
             set
             {
                 currentEnemyCount = value;
                 if (currentEnemyCount <= 0)
                 {
                     CreateEnemies();
                 }
             }
         }
 
 
         void Awake()
         {
             CreateEnemies();
         }
 
         void CreateEnemies()
         {
             for (int i = 0; i < spawnCount; i++)
             {
                 Instantiate(enemyPrefab);   // Add in spawn locations - whatever you want
                 currentEnemyCount++;
             }
         }
 
         /// <summary>
         /// CALL THIS FROM ENEMY SCRIPT WHEN IT DIES
         /// The call would look like SpawnManager.Instance.OnEnemyDeath();
         /// </summary>
         public void OnEnemyDeath()
         {
             // As this gets to zero, it will spawn more through the property
             CurrentEnemyCount--;
         }

Spawn waves & wait till it's killed, spawn again.

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