koobas.hobune.stream
How to make waves of enemys spawn after few seconds.
Hi, I picked up unity less than week ago so I don't realy know what's wrong with this code. I've read that you can't use WaitForSeconds();in Update but I don't know why and I don't know how to do it otherwise. Can somebody help me how should I do it?
public class Spawning : MonoBehaviour
{
public GameObject zombiePrefab;
int randomSpawnZone;
float randomPositionX, randomPositionY;
Vector3 spawnPosition;
public float enemySpawned = 5f;
public float enemysToKill = 5;
public float enemyAddedEveryRound = 1;
void Start ()
{
for (int i = 0; i < enemySpawned; i++)
{
SpawnNewEnemy();
}
}
void Update ()
{
EnemyWaveSpawner();
}
IEnumerator Wait()
{
yield return new WaitForSeconds(3);
}
void SpawnNewEnemy()
{
randomSpawnZone = Random.Range(0, 4);
switch (randomSpawnZone)
{
case 0:
randomPositionX = Random.Range(-10f, 10f);
randomPositionY = Random.Range(-6f, -5f);
break;
case 1:
randomPositionX = Random.Range(-10f, 10f);
randomPositionY = Random.Range(5f, 6f);
break;
case 2:
randomPositionX = Random.Range(10f, 11f);
randomPositionY = Random.Range(-5f, 5f);
break;
default:
randomPositionX = Random.Range(-11f, -10f);
randomPositionY = Random.Range(-5f, 5f);
break;
}
spawnPosition = new Vector3(randomPositionX, randomPositionY, 0f);
Instantiate(zombiePrefab, spawnPosition, Quaternion.identity);
}
void EnemyWaveSpawner()
{
if (enemysToKill == 0)
{
Wait();
enemySpawned += enemyAddedEveryRound;
enemysToKill = enemySpawned;
for (int i = 0; i < enemySpawned; i++)
{
SpawnNewEnemy();
}
}
}
}
If you want to execute a code-block over time like this, the thing you need is called Coroutine. You were partially on a right track there but the code didn't make much sense. Paczaj na to instead:
public class Spawning : MonoBehaviour
{
[SerializeField] GameObject zombiePrefab;
public int enemyAddedEveryRound = 5;
public int enemiesSpawned = 0;
void Start ()
{
StartCoroutine( EnemyWaveSpawnerRoutine() );
}
IEnumerator EnemyWaveSpawnerRoutine ()
{
SpawnWave();
while( enemiesSpawned>0 )
{
SpawnWave();
yield return new WaitForSeconds(3);
}
}
void SpawnWave ()
{
for( int i=0 ; i<enemyAddedEveryRound ; i++ )
{
SpawnEnemy();
}
enemiesSpawned += enemyAddedEveryRound;
}
void SpawnEnemy ()
{
int randomSpawnZone = Random.Range(0, 4);
float randomPosX;
float randomPosY;
switch( randomSpawnZone )
{
case 0:
randomPosX = Random.Range(-10f, 10f);
randomPosY = Random.Range(-6f, -5f);
break;
case 1:
randomPosX = Random.Range(-10f, 10f);
randomPosY = Random.Range(5f, 6f);
break;
case 2:
randomPosX = Random.Range(10f, 11f);
randomPosY = Random.Range(-5f, 5f);
break;
default:
randomPosX = Random.Range(-11f, -10f);
randomPosY = Random.Range(-5f, 5f);
break;
}
Vector3 spawnPosition = new Vector3( randomPosX , randomPosY , 0f );
Instantiate( zombiePrefab , spawnPosition , Quaternion.identity );
}
}
You need to write StartCoroutine(COROUTINE()); So instead of calling the Wait function like Wait(); you have to write StartCoroutine(Wait());
You cannot write yield return new WaitForSeconds() in the update function becuse it returns void compared to your Wait function that returns an IEnumerator. I am not that knowledgeable about how coroutines actually work but here are some links if you want to learn more. https://docs.unity3d.com/ScriptReference/MonoBehaviour.StartCoroutine.html https://docs.unity3d.com/ScriptReference/Coroutine.html
