detect gameObject in a range

Questions & Answers
1

hello all, I would create a gameObject spawner, but I have a great problem, I can’t check the number of entity in the range (the number become very large)

public class Spawner : MonoBehaviour
{

		public GameObject mob;
		public float radius = 10;
		public int maxEntity = 5;
		string mobName;
		int number;
		float dist;
		int timer = 120;
		List<GameObject> mobSpawnList = new List<GameObject> ();

	void Start ()
	{
		mobName = mob.name;
	}

	void OnDestroy()
	{
		mobSpawnList.Remove (mob);
		print ("destroyed");
	}

	void Update ()
	{
		timer--;
			if (timer < 1) {
				Spawn ();
				timer = 120;
			}
		GetNumber ();
		dist = Vector3.Distance (mob.transform.position, transform.position);
		print (number);
		OnDestroy ();
	}

	void Spawn ()
	{
				if (number <= maxEntity) {
						Instantiate (mob, transform.position, Quaternion.identity);
				}
	}

	public int GetNumber()
	{

		if (dist <= radius) {
			mobSpawnList.Add (mob);
			number = mobSpawnList.Count;
		}

		return number;
	}
}
2

Use CircleCollider and when object starts colliding with it then add it to the list. When exits the collider area you remove it. Like this:

public class AreaMobsCounter : MonoBehaviour {
    private List<GameObject> ObjectsInRange = new List<GameObject>();

    public void OnTriggerEnter(Collider col){
        ObjectsInRange.Add(col.gameObject);
    }

    public void OnTriggerExit(Collider col){
        //Probably you'll have to calculate wich object it is
        ObjectsInRange.Remove(col.gameObject);
    }
}

Hope that will help.