private GridNode NodeFromWorldPoint(Vector3 worldPosition)
{
    int evenX = Mathf.FloorToInt(worldPosition.x) % 2 == 0 ? Mathf.FloorToInt(worldPosition.x) : Mathf.FloorToInt(worldPosition.x) - 1;
    int evenZ = Mathf.FloorToInt(worldPosition.z) % 2 == 0 ? Mathf.FloorToInt(worldPosition.z) : Mathf.FloorToInt(worldPosition.z) - 1;

    return grid[new Vector2Int(evenX, evenZ)];
}