c# - 产生所需数量的预制件

Question

如何使用以下代码实例化所需数量的预制件？我需要生成一个（并且只有一个）玩家预制件、X 个敌人和一个（并且只有一个）最终游戏预制件。

    private void GenerateEnemies(int xMax, int zMax)
    {
        GameObject landscape = new GameObject("ENEMIES");


        for (int z = 0; z < zMax; z++)
        {
            for (int x = 0; x < xMax; x++)
            {
                randNum = Random.Range(0, 100);

                if (randNum < 10 )
                {
                    Instantiate(enemy1, new Vector3(x * 10, 0, z * 10), Quaternion.Euler(0, 0, 0));//, landscape.transform);
                }
                else if (randNum < 20)
                {
                    Instantiate(enemy2, new Vector3(x * 10, 0, z * 10), Quaternion.Euler(0, 0, 0));//, landscape.transform);
                }

                else if (randNum < 30)
                {
                    Instantiate(enemy3, new Vector3(x * 10, 0, z * 10), Quaternion.Euler(0, 0, 0));//, landscape.transform);
                }

                else if (randNum < 40)
                {
                    Instantiate(enemy4, new Vector3(x * 10, 0, z * 10), Quaternion.Euler(0, 0, 0));//, landscape.transform);
                }

                else if (randNum < 50)
                {
                    Instantiate(enemy5, new Vector3(x * 10, 0, z * 10), Quaternion.Euler(0, 0, 0));//, landscape.transform);
                }

            }
        }
    }

标签： c#listunity3dspawn

Answer 1

好吧，只需在循环之外做你一次性的事情！

还

randNum = Random.Range(0, 100);

然后您仅使用 5 种不同的情况，并且仅在值较小的情况下使用50（因此，在大约一半的情况下，根本没有任何反应......）。如果这是有意的.. ok-ish .. 否则我宁愿使用列表和随机索引：

// HINT: Rather have a list for your prefabs
// this shrinks your code a lot
public List<GameObject/*or whatever type*/> eneymPrefabs = new List<GameObject>();
public Gamebject playerPrefab;
public GameObject endGamePrefab;

private void GenerateEnemies(int xMax, int zMax)
{
    var landscape = new GameObject("ENEMIES");

    // Do these only once
    // store the references in case you need them later
    var player = Instantiate(playerPrefab);
    var endGame = Instantiate(endGamePrefab);

    for (int z = 0; z < zMax; z++)
    {
        for (int x = 0; x < xMax; x++)
        {
            // simply pick a random index from the prefab list
            int randIndex = Random.Range(0, eneymPrefabs.Count);

            // and get the according random prefab
            var enemyPrefab = enemyPrefabs[randIndex];

            if(enemyPrefab) Instantiate(enemyPrefab, new Vector3(x * 10, 0, z * 10), Quaternion.identity /*, landscape.transform*/);
        }
    }
}

---

或者 Draco18s 提到的加权列表的例子

[Serializable]
public class WeightedPrefab
{
    public GameObject Prefab;
    public int Weight = 1;
}

public List<WeightedPrefab> weightedEnemyPrefabs;
public Gamebject playerPrefab;
public GameObject endGamePrefab;

private void GenerateEnemies(int xMax, int zMax)
{
    // create a temp list using the weights and random index on this one
    var enemyPrefabs = new List<GameObject>();
    foreach(var item in weightedEnemyPrefabs)
    {
        for(var i = 0; i < item.Weight; i++)
        {
            enemyPrefabs.Add(item.Prefab);
        }
    }

    // Rest stays the same

    var landscape = new GameObject("ENEMIES");

    // Do these only once
    // store the references in case you need them later
    var player = Instantiate(playerPrefab);
    var endGame = Instantiate(endGamePrefab);

    for (int z = 0; z < zMax; z++)
    {
        for (int x = 0; x < xMax; x++)
        {
            // simply pick a random index from the prefab list
            int randIndex = Random.Range(0, eneymPrefabs.Count);

            // and get the according random prefab
            var enemyPrefab = enemyPrefabs[randIndex];

            if(enemyPrefab) Instantiate(enemyPrefab, new Vector3(x * 10, 0, z * 10), Quaternion.identity /*, landscape.transform*/);
        }
    }
}

如果不是在每种情况下都实例化敌人是故意的，您仍然可以使用这两种方法并简单地将预制参考留空→因为该索引不会实例化任何内容。

---

敌人和结束游戏应该是网格的一部分

在这种情况下，我会首先将整个网格组合写入一个列表。从这个列表中随机选择两个条目，然后将 player 和 endGame 放在那里。然后挡住这两个网格位置，不要在那里生成敌人：

[Serializable]
public class WeightedPrefab
{
    public GameObject Prefab;
    public int Weight = 1;
}

public List<WeightedPrefab> weightedEnemyPrefabs;
public Gamebject playerPrefab;
public GameObject endGamePrefab;

private void GenerateEnemies(int xMax, int zMax)
{
    // Create a list of all awailable grid positions
    var gridPositions = new List<Vector2Int>();
    for (int z = 0; z < zMax; z++)
    {
        for (int x = 0; x < xMax; x++)
        {
            gridPositions.Add(new Vector2Int(x,z));
        }
    }

    // pick the two random positions for player and endgame
    var playerPosIndex = Random.Range(0, gridPositions.Count);
    var playerPos = gridPositions[playerPosIndex];
    gridPositions.RemoveAt(playerPosIndex);

    var endGamePosIndex = Random.Range(0, gridPositions.Count);
    var endGamePos = gridPositions[endGamePosIndex];
    gridPositions.RemoveAt(endGamePosIndex);

    // create a temp list using the weights and random index on this one
    var enemyPrefabs = new List<GameObject>();
    foreach(var item in weightedEnemyPrefabs)
    {
        for(var i = 0; i < item.Weight; i++)
        {
            enemyPrefabs.Add(item.Prefab);
        }
    }

    var landscape = new GameObject("ENEMIES");

    // Do these only once
    // store the references in case you need them later
    var player = Instantiate(playerPrefab, new Vector3(payerPos.x * 10, 0, playerPos.y * 10), Quaternion.identity /*, landscape.transform*/);
    var endGame = Instantiate(endGamePrefab, new Vector3(endGamePos.x * 10, 0, endGamePos.y * 10), Quaternion.identity /*, landscape.transform*/);

    for (int z = 0; z < zMax; z++)
    {
        for (int x = 0; x < xMax; x++)
        {
            // Now simply ignore the playerPos and endGamePos
            if(x == playerPos.x && z == playerPos.y) continue;
            if(x == endGamePos.x && z == endGamePos.y) continue;

            // pick a random index from the prefab list
            int randIndex = Random.Range(0, eneymPrefabs.Count);

            // and get the according random prefab
            var enemyPrefab = enemyPrefabs[randIndex];

            // do nothing if enemyPrefab is null otherwise instantiate
            if(enemyPrefab) Instantiate(enemyPrefab, new Vector3(x * 10, 0, z * 10), Quaternion.identity /*, landscape.transform*/);
        }
    }
}