Can't load prefabs from resources into an array

Question

I'm making a game with very small levels (think Wario Ware Style). I decided that every microlevel should be a prefab. So I'm going to put all the level prefabs into a Levels directory inside my Resources folder. Then I'm planning to load all the levels into an array, shuffle it with a simple algorithm and then spawn one of them at a time. (I've got an external manager calling the spawn function when needed). Problem is, it seems not to load my levels at all. Is there something wrong in what I'm doing? And plus, is this a good approach? Thank you!

     private Transform _currentLevel;
     private Transform _player;
     private Transform[] _levels;
     private int _levelIndex;
     
     // Use this for initialization
     void Start () {
         _player = GameObject.FindGameObjectWithTag("Player").transform;
         //load all levels from resources
         _levels = Resources.LoadAll("Levels") as Transform[];
         _levelIndex=0;
     }
     
     public void SpawnLevel ()
     {
         if (_levelIndex==_levels.Length-1)
         {
             _levelIndex=0;
             MixLevels ();
         }
         
         _currentLevel=Instantiate(_levels[_levelIndex],transform.position,Quaternion.identity) as Transform;
         _currentLevel.parent=this.transform;
         _player.position=new Vector3(0,1,0);
         _player.gameObject.SetActive(true);
         
         _levelIndex++;
     }
     
     public void DestroyLevel ()
     {
         _player.gameObject.SetActive(false);
         if (_currentLevel) Destroy(_currentLevel.gameObject);
     }
     
     public void MixLevels()
     {
         //apply a Fisher-Yates algorithm to create a new level pool
         for (int i = _levels.Length-1; i>0; i--)
         {
             var r = Random.Range(0,i);
             var tmp = _levels[i];
             _levels[i]=_levels[r];
             _levels[r]=tmp;
         }
     }
 }

Answer 1

Answer by Joyrider · Aug 13, 2013 at 09:43 AM

This should work :

Object[] _levelObj = Resources.LoadAll("Levels", typeof(Object));

my guess is, Unity doesn't like your array casting as Transform[]

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kurai · Aug 13, 2013 at 09:58 AM 0

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Oh, it seems the casting was the problem. Now it works (almost) perfectly. I've still got a problem with the instantiate part, it correctly spawns the level, but somewhat it cannot parent it to my gameobject (it throws the same Nullreference Exception). Let's see if I can solve this.

vexe · Aug 13, 2013 at 10:20 AM 0

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'what' is null? this.transform?

vexe · Aug 13, 2013 at 10:23 AM 1

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After you loaded your levels as objects, did you convert each one again to 'Transform'?

kurai · Aug 13, 2013 at 10:40 AM 0

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Solved, still a transform casting problem. I casted to a GameObject ins$$anonymous$$d and everything works now, thanks!

Can't load prefabs from resources into an array

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