Confusion about the tilemap

Unity Engine
1

I made a sample project of hexagonal map.

1100×624 1.31 MB

Whenever user click on cell, robot will move to the cell position.

    public Tilemap _tilemap;

    public GameObject _player;

    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            Vector3Int coordinate = _tilemap.WorldToCell(mousePos);
            Debug.Log(string.Format("coordinate pos is [X: {0} Y: {0} Z: {0}]", coordinate.x, coordinate.y, coordinate.z));
            Vector3 selectCellPos = _tilemap.CellToWorld(coordinate);
            Debug.Log(string.Format("cell world pos is [X: {0} Y: {0} Z: {0}]", selectCellPos.x, selectCellPos.y, selectCellPos.z));
            selectCellPos.z = 0;
            _player.transform.position = selectCellPos;
        }
    }

It works fine, but when I checked Log something confused me.
When I click center cell, tilemap.WorldToCell return (0, 0, 0).
When I click cell at top right of center , tilemap.WorldToCell still return (0, 0, 0).
However, tilemap.CellToWorld return different value when both cell input (0, 0, 0).
Why?

2

Check your use of this. You need to supply a Vector3 with the .z set to how far into the scene you want the position. Input.mousePosition is always z == 0 so your worldPosition is probably right ON your camera, wherever that is.