Why can't I Set Tile in an Empty space?

Questions & Answers
1

Hi Internet, I’m already developing my 2d game but the problem is editing the tile map. You See, the method used for Tilemaps to edit a tile is SetTile(Vector3Int pos, Tilebase tile), but how do I add a tile if the position I pressed has no Tile?

Here is my Code:

public class TerrainEditManager : MonoBehaviour
{

    public PlayerMovement move;

    public TileBase currentTile;
    
    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            CastRay();
        }
    }

    void CastRay()
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit2D hit = Physics2D.Raycast(ray.origin, ray.direction, Mathf.Infinity);
        if (hit.collider != null)
        {
            Tilemap map = hit.collider.gameObject.GetComponent<Tilemap>();
            
            if (map != null)
            {
                Vector3Int cell = map.WorldToCell(hit.point);
                if (!((move.movingJoystick.Horizontal >= 0.01 ||  move.movingJoystick.Horizontal <= -0.01)|| (move.otherJoystick.Vertical >= 0.01 ||  move.otherJoystick.Vertical <= -0.01)))
                {
                    TileBase tileBase = map.GetTile(cell);
                    Sprite sprite = map.GetSprite(cell);

                    if (tileBase != null)
                    {
                        StartCoroutine(DeleteTile(map, cell, GetTileDuration(sprite.name)));
                        Debug.Log("Yay");
                    }
                    else
                    {
                        map.SetTile(cell, currentTile);
                        Debug.Log("No");
                    }
                }
            }
            else
            {
                Debug.Log("No");
            }
        }
    }

    public IEnumerator DeleteTile(Tilemap tilemap, Vector3Int pos, float duration)
    {
        yield return new WaitForSeconds(duration);
        tilemap.SetTile(pos, null);
    }

    public float GetTileDuration(string tileName)
    {
        switch (tileName)
        {
            default: return 0f;
            case "Tile 1": return 1f;
            case "Tile 2": return 0.5f;
            case "Tile 3": return 2f;
        }
    }
}

Please I need a solution quick cause this is a challenge to prove myself. Thanks for the Answers.

2

You can set tiles to any position possible in a tilemap, however your code raycasts to find out where to place the tile. Raycasts require solid objects in order to find a hit point. Therefore, if the space is empty, the raycast check will fail, and so you can’t place your tile there.

Change your code to use Camera.main.ScreenToWorldPoint(Input.mousePosition). Since this is a 2D game, there is no need for colliders, as it just converts where you click to world space, and places a tile there.