I cant callculate take right tile from my grid

Unity Engine
, , ,
1

i have some problem.
my script board

private GameTile[,] board;
    private Vector2 offset;

    [SerializeField] float cellWidth;
    [SerializeField] float cellHeight;
    [SerializeField] int countX;
    [SerializeField] int countY;
    [SerializeField] GameObject background;

    private float boardWidth;
    private float boardHeight;

    public void CreateBoardCells()
    {

        float worldHeightScreen = Camera.main.orthographicSize * 2f;
        float worldWidthScreen = worldHeightScreen / Screen.height * Screen.width;

        cellWidth = worldWidthScreen / (countX + 2);
        cellHeight = worldHeightScreen / (countY + 6);

        boardWidth = cellWidth * countX;
        boardHeight = cellHeight * countY;

        board = new GameTile[countX, countY];

        offset = new Vector2(boardWidth * 0.5f, boardHeight * 0.5f);

        for (int x = 0; x < board.GetLength(0); x++)
        {
            for (int y = 0; y < board.GetLength(1); y++)
            {
                Vector3 position = new Vector3((x * cellWidth + cellWidth / 2) - offset.x,
 (y * cellHeight + cellHeight / 2) - offset.y);
                board[x, y] = new board();
            }
        }
    }

and its created a board game with sprites what i want at center relative from screen
and i try to callculate position from mouse to my grid but every time fail because i am not cool math and suppouse callculate something wrong
script callculate grid

public GameTile GetTileFromMap(Vector3 worldPos)
    {
        float percentegeX = (worldPos.x + boardWidth / 2) / boardWidth;
        float percentegeY = (worldPos.y + boardHeight / 2) / boardHeight;
        percentegeX = Mathf.Clamp01(percentegeX);
        percentegeY = Mathf.Clamp01(percentegeY);
        float countValueX = countX - 1;
        float countValueY = countY - 1;
        int x = Mathf.RoundToInt(countValueX * percentegeX);
        int y = Mathf.FloorToInt(countValueY * percentegeY);
        return board[x, y];
    }

and it almost works as it should, just super inaccurate. for example, if you press on a cell from 0-7, then he will sometimes select it and sometimes not. apparently the surroundings are super inaccurate

2

You may want to check out Unity’s Grid class to handle the calculations if math is not your strong suit. (math is not my strong suit, so I can’t debug your math)

You can convert coordinates using CellToWorld and WorldToCell, and then use the Cell coordinates to look up a tile from your board array.