How can I set properties on multiple clones in a generic list after instantiation.

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I don't understand why this does not work:

 Vector3 pos = new Vector3(x,0,y);                    
 TerrainTiles.Add(Instantiate(Resources.Load("Prefabs/TerrainTile"), pos, Quaternion.identity) as TerrainTile);
 Debug.Log("List items: " + TerrainTiles.Count.ToString());
 TerrainTiles[TerrainTiles.Count - 1].xPosition = x;

Running the debug log shows that the list items are being created but when I try to reference any of them as in the last line of code above I am getting a NullReferenceException.

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Answer by Guts · Dec 08, 2013 at 12:15 PM

Have you tried using a version of Resources.Load that uses an explicit Type? Either:

 TerrainTiles.Add(Instantiate(Resources.Load("Prefabs/TerrainTile", typeof(TerrainTile)), pos, Quaternion.identity) as TerrainTile);

or:

 TerrainTiles.Add(Instantiate(Resources.Load<TerrainTile>("Prefabs/TerrainTile"), pos, Quaternion.identity) as TerrainTile);

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Magian · Dec 08, 2013 at 03:22 PM 0

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The first one works, thank you!! However, FYI the compiler complains about the second one:

Assets/Resources/Scripts/Game$$anonymous$$anager.cs(19,72): error CS0308: The non-generic method UnityEngine.Resources.Load(string)' cannot be used with the type arguments Assets/Resources/Scripts/Game$$anonymous$$anager.cs(19,50): error CS1502: The best overloaded method match for UnityEngine.Object.Instantiate(UnityEngine.Object, UnityEngine.Vector3, UnityEngine.Quaternion)' has some invalid arguments

Assets/Resources/Scripts/Game$$anonymous$$anager.cs(19,50): error CS1503: Argument #1' cannot convert object' expression to type UnityEngine.Object' Assets/Resources/Scripts/Game$$anonymous$$anager.cs(19,46): error CS1502: The best overloaded method match for System.Collections.Generic.List.Add(TerrainTile)' has some invalid arguments

Assets/Resources/Scripts/Game$$anonymous$$anager.cs(19,46): error CS1503: Argument #1' cannot convert object' expression to type `TerrainTile'

Guts · Dec 08, 2013 at 05:16 PM 0

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It looks like the generic version was added at some point after Unity 4.0.0. $$anonymous$$y original test was using 4.3.1, which worked fine, but when I tried the test in 4.0.0 I got the same compile error. It would be nice if the Unity docs allowed you to change the version (like in the $$anonymous$$SDN docs).

How can I set properties on multiple clones in a generic list after instantiation.

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