limit number of gameobjects instantiated

Question

Hello all!!

Sorry for my another stupid question...

Also following the Survival Shooter Tutorial, I'm using the enemyManager script.

It spawns clones (from prefab) as I want. But I do want to limit their number (ressources issues)

How can I do that?

Here's the full code :

using UnityEngine;

public class EnemyManager : MonoBehaviour { public PlayerHealth playerHealth;
public GameObject enemy;
public float spawnTime = 3f;
public Transform[] spawnPoints;

 void Start ()
 {
     
     InvokeRepeating ("Spawn", spawnTime, spawnTime);
 }


 void Spawn ()
 {
     
     if(playerHealth.currentHealth <= 0f)
     {
         
         return;
     }


     int spawnPointIndex = Random.Range (0, spawnPoints.Length);


     Instantiate (enemy, spawnPoints[spawnPointIndex].position, spawnPoints[spawnPointIndex].rotation);
 }

}

Answer 1

Best Answer

Answer by KoenigX3 · Jan 15, 2017 at 10:32 PM

 int maxEnemy = 50;
 int enemyCount = 0;
 
 void Spawn()
 {
     if(enemyCount >= maxEnemy) return;
     // Instantiate
     enemyCount++;
 }

That is quite an easy approach. If you are going to kill the enemies, you should decrease the enemyCount, and the method will create a new one.

However, if you are not going to do much with them, you should probably cancel the invoke by calling

 CancelInvoke("Spawn");

and restart the invoke when you need it. This thing is for performance-efficiency.

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rabione · Jan 16, 2017 at 12:04 AM 0

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Nice script!!

I've tryed to make a few enemies and decreased enemyCount parameter; but it don't creat new enemies when I kill those instantiated :

void Start () {

     InvokeRepeating ("Spawn", spawnTime, spawnTime);
 }


 void Spawn ()
 {
     
     if(playerHealth.currentHealth <= 0f)
     {
         
         return;
     }


     int spawnPointIndex = Random.Range (0, spawnPoints.Length);

     if(enemyCount >= maxEnemy) 

         return;
     
     Instantiate (enemy, spawnPoints[spawnPointIndex].position, spawnPoints[spawnPointIndex].rotation);

     enemyCount++;
 }

KoenigX3 rabione · Jan 16, 2017 at 10:25 AM 0

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First, you have to make a public function in the Enemy$$anonymous$$anager class. You must call it every time an enemy gets killed. To access the script, you must find the GameObject this script is attached to, then access the script by

 managerGameObject.GetComponent<Enemy$$anonymous$$anager>().Function();

where managerGameObject is the GameObject this script is attached to, and Function() is the new function, which you should call every time an enemy gets killed. In this function you should decrease the enemyCount. If you are cancelling the invoke somewhen, you should check if you need to restart it.

Also, finding the right gameobject at runtime can have an impact on the performance. You could create an Enemy$$anonymous$$anager-typed variable in the enemy script, and initialize that when instantiating.

 GameObject enemy = (GameObject) Instantiate (enemy, spawnPoints[spawnPointIndex].position, spawnPoints[spawnPointIndex].rotation);
 enemy.GetComponent<EnemyScript>().manager = this;

This will create a permanent reference to the Enemy$$anonymous$$anager instance in every enemy object. When you kill an enemy, and you must call the function in the Enemy$$anonymous$$anager, you don't need to find the GameObject - you can use the 'manager' variable to call the function.

rabione KoenigX3 · Jan 16, 2017 at 09:38 PM 0

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Thank you so much :)

limit number of gameobjects instantiated

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