Spawning Enemies in a Repeating Pattern

Hey everyone, I am trying to make a space shooter game where enemies spawn repeatedly. I tried to make them spawn after a certain amount of time, but I could not figure it out. I made code below that should spawn 10 enemies repeatedly as well, but the code only spawns one. Can someone help me out?

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Spawn : MonoBehaviour
5. {
6.     public GameObject [] spawnpoints;
7.     public GameObject Enemy;
8.     private int i;
9.  
10.  
11.  
12.     void Start ()
13.     {
14.        
15.         spawnpoints = GameObject.FindGameObjectsWithTag ("Spawnpoint");
16.         i = 1;
17.  
18.  
19.         while (i < 10)
20.         {
21.             GameObject spawn = spawnpoints [Random.Range (0, spawnpoints.Length)];
22.             Instantiate (Enemy, spawn.transform.position, spawn.transform.rotation);
23.             i = i + 1;
24.         }
25.  
26.            
27.     }
28.        
29. }

 

Code (csharp):

1.  
2. void Start()
3.  

called once at the start of the life of the gameobject

Code (csharp):

1.  
2. while(i <10)
3.  

entire loop code executed in a single frame, there is no concept of time here...

by the looks of it this code should be producing "one wave" of 10... was that what you mean?

 

might be of interest

 

I realized that the loop had no time parameters when I asked the question, and that hurdle was something I tried to overcome when I first started trying to make spawn waves. But I could not figure it out so i decided to break down the problem further by just getting enemies to spawn one after another.

I want the code to make 10 enemies back to back basically. Thats what I mean.

Ill go check that video now.

 

Yeah that video was informative and helpful. Ill go update my code and if I still need help ill post tomorrow I guess. But hopefully this video should be able to help me out a lot.

 

If you want to spawn enemies at a certain amount of time, you have to use Coroutines.
For example, let's say that you want to spawn enemies once every 0.5 seconds.

Code (CSharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class Spawn : MonoBehaviour
6. {
7.     public GameObject [] spawnpoints;
8.     public GameObject Enemy;
9.     private int i = 0;
10.  
11.     private IEnumerator SpawnEnemies()
12.     {
13.         GameObject spawn = spawnpoints[Random.Range(0, spawnpoints.Length)];
14.         Instantiate(Enemy, spawn.transform.position, spawn.transform.rotation); // I would honestly use Quaternion.identity instead of spawn.transform.rotation, but it is up to you
15.         i++;
16.         yield return new WaitForSeconds(0.5f); // or you can put any amount of seconds in here
17.         if (i < 10) StartCoroutine(SpawnEnemies());
18.         // don't need an else because it won't do anything when the condition is not met
19.     }
20.  
21.     void Start ()
22.     {
23.      
24.         spawnpoints = GameObject.FindGameObjectsWithTag ("Spawnpoint");
25.         StartCoroutine(SpawnEnemies());  
26.     }
27.      
28. }
29.  

Please do let me know if it works.

 

Your advice might be a tad bit late, since the post you're replying to is four years old.

But just a tad. They've probably got the project on hold waiting for exactly this thread to get an answer.