private Dictionary <Vector3Int, Direction> FindFreeSpacesAroundRoad(List <Vector3Int> roadPositions)
{
Dictionary <Vector3Int, Direction> freeSpaces = new Dictionary <Vector3Int, Direction>();
foreach (var position in roadPositions)
{
var neighbourDirections = PlacementHelper.FindNeighbour(position, roadPositions);
foreach (Direction direction in Enum.GetValues(typeof(Direction)))
{
if (neighbourDirections.Contains(direction) == false)
{
var newPosition = position + PlacementHelper.GetOffsetFromDirection(direction);
if (freeSpaces.ContainsKey(newPosition))
{
continue;
}
freeSpaces.Add(newPosition, PlacementHelper.GetReverseDirection(direction));
}
}
}
return(freeSpaces);
}
