Question

你好，我有一个敌人产卵系统，它的工作正常。然而敌人在同一点重叠，因为我使用random.range，我在地图上有4个点，我希望每个敌人随机选择一个点。因此，我希望在产生敌人之后，另一个敌人只能获得3个选择，而不是4个。

这是我的代码：

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class Spawn : MonoBehaviour {

    // The enemy prefab to be spawned.
    public GameObject[] enemy;  

    //public Transform[] spawnPoints;         
    public List<Transform> spawnPoints = new List<Transform>();
    private float timer = 3;

    int index = 0;    
    List <GameObject> EnemiesList = new List<GameObject>();
    private int m_enemyCount = 4;

    // Update is called once per frame
    void Update () {
        if (timer >0)
        {
            timer -= Time.deltaTime;
        }
        if (timer <= 0 )
        {               
            if ( EnemiesList.Count == 0 )
            {
                Spawner();  
                timer = 5;
            }
        }
    }

    void Spawner ()
    {
        // Create an instance of the enemy prefab at the randomly selected spawn point's position.
        //Create the enemies at a random transform 
        for (int i = 0; i<m_enemyCount;i++)
        {
            int spawnPointIndex = Random.Range (0, spawnPoints.Count);
            Transform pos = spawnPoints[spawnPointIndex];

            GameObject InstanceEnemies= Instantiate ( enemy[index] , spawnPoints[spawnPointIndex].position , Quaternion.identity) as GameObject;

            // Create enemies and add them to our list.
            EnemiesList.Add(InstanceEnemies);               
        }
    }

Answer 1

处理此问题的一种简单方法是在Spawner()方法中创建一个生成点的本地列表，这样您就可以跟踪已经使用过的生成点。例如：

void Spawner ()
{
    //create a local list of spawn points
    List<Transform> availablePoints = new List<Transform>(spawnPoints);

    // Create an instance of the enemy prefab at the randomly selected spawn point's position.
    //Create the enemies at a random transform 
    for (int i = 0; i<m_enemyCount;i++)
    {
        //use local availableSpawnPoints instead of your global spawnPoints to generate spawn index
        int spawnPointIndex = Random.Range (0, availableSpawnPoints.Count);
        Transform pos = spawnPoints[spawnPointIndex];

        GameObject InstanceEnemies= Instantiate ( enemy[index] , avaialableSpawnPoints[spawnPointIndex].position , Quaternion.identity) as GameObject;

        // Create enemies and add them to our list.
        EnemiesList.Add(InstanceEnemies);

       //remove the used spawnpoint
       availableSpawnPoints.RemoveAt(spawnPointIndex);

    }
}

此解决方案可确保您下次调用Spawner()方法时，您的全局生成点列表将保持不变。

Answer 2

从for循环结尾处的列表spawnPoints中删除已经生成的spawnpoints，如下所示：

spawnPoints.RemoveAt(spawnPointIndex);

您可能希望在for循环之前创建该列表的副本，但要保持原始格式。

停止允许random.range获取相同的spawnpoint。它会导致敌人重叠

2 个答案: