// Directional walls/columns
 public void ConvertDirectionalColumn(VirtualMap map, VirtualCell conversion_cell, bool mayBeDirectional)
 {
     if (!mayBeDirectional)
     {
         return;
     }
     if (conversion_cell.IsCorridorColumn())
     {
         ConvertDirectionalCorridorColumn(map, conversion_cell);
     }
     else if (conversion_cell.IsRoomColumn())
     {
         ConvertDirectionalRoomColumn(map, conversion_cell);
     }
 }