Sewer Lines!

We have sewer lines in the city generator now!

They walk out of the pump stations along a perturbed grid (the same grid used to make the city walls).  They are allowed to run into each other but they cannot "step over", so you will see lines terminate into a T intersection with another line but they shouldn't make a Cross Section between two pump station lines. They also grow to service buildings and have a density setting.  This will allow for "main trunk" lines, that head back to the pumping stations.  There is some work to add verticality, the deepest lines should be closest to the station and the lines furthest away should be highest.

Next steps are the Cathedrals and Catacombs, similar in design to the Pump Stations and Sewer Lines.  The Cathedrals act as the central hubs for the catacombs, they should be the most concentrated near the Cathedrals and spiderweb out.  My current thoughts are to use Diffusion-limited Aggregation

Thanks!