TileMap NullReferenceException when calling SetTile

Question

I am trying to create a terrain generator that works based on TileMaps but when I try to create a TileMap at runtime it gives me a NullReferenceException when calling the SetTile method. Here is my code. My Unity version is 2019.2.17f1 but I also tested on 2018.4.14f1 with the same result.

 public static Tilemap GenerateTerrain(Planet planet)
     {
         Tilemap map = new Tilemap();
 
         for (int x = 0; x < planet.size; x++)
         {
             float height = Mathf.PerlinNoise(x / 60f, 0);
 
             int intHeight = Mathf.FloorToInt(height);
 
             Vector3Int tilePos = new Vector3Int(x, intHeight, 0);
 
             map.SetTile(tilePos, Tiles.grass); //This line gives me the error
         }
 
         return map;
     }

Answer 1

Best Answer

Answer by MrSlimeDude · Dec 30, 2019 at 10:25 PM

Solved it. Turns out that you cannot create a component without attaching it to a GameObject.

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Answer 2

Answer by Ever234 · Dec 30, 2019 at 06:16 AM

You need to have the Tile variable or some reference from the outside in the script

 public Tile grass;
 Vector3Int tilePos = new Vector3Int(x, intHeight, 0);
     
     map.SetTile(tilePos, grass);

PD: Dont forget to fill the Tile slot of the script with your tile in the editor

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MrSlimeDude · Dec 30, 2019 at 01:39 PM 0

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Thanks, but when I put two Debug.Log statements before the map.SetTile like this:

 Debug.Log(map);
 Debug.Log(Tiles.grass);
 map.SetTile(tilePos, Tiles.grass);

Then the unity console returns this: alt text

capture.png (43.6 kB)

TileMap NullReferenceException when calling SetTile

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