Spawning Enemies in a Repeating Pattern

Unity Engine
1

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?

using UnityEngine;
using System.Collections;

public class Spawn : MonoBehaviour
{
    public GameObject [] spawnpoints;
    public GameObject Enemy;
    private int i;



    void Start ()
    {
       
        spawnpoints = GameObject.FindGameObjectsWithTag ("Spawnpoint");
        i = 1;


        while (i < 10)
        {
            GameObject spawn = spawnpoints [Random.Range (0, spawnpoints.Length)];
            Instantiate (Enemy, spawn.transform.position, spawn.transform.rotation);
            i = i + 1;
        }

           
    }
       
}
2 
void Start()

called once at the start of the life of the gameobject

while(i <10)

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?

1 Like
3

might be of interest

1 Like
4

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.

5

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.

6

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.

using UnityEngine;
using System.Collections;

public class Spawn : MonoBehaviour
{
    public GameObject [] spawnpoints;
    public GameObject Enemy;
    private int i = 0;

    private IEnumerator SpawnEnemies()
    {
        GameObject spawn = spawnpoints[Random.Range(0, spawnpoints.Length)];
        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
        i++;
        yield return new WaitForSeconds(0.5f); // or you can put any amount of seconds in here
        if (i < 10) StartCoroutine(SpawnEnemies());
        // don't need an else because it won't do anything when the condition is not met
    }

    void Start ()
    {
     
        spawnpoints = GameObject.FindGameObjectsWithTag ("Spawnpoint");
        StartCoroutine(SpawnEnemies());  
    }
     
}

Please do let me know if it works. :slight_smile:

7

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.