Like always things take much longer than I expected. I decided to change some of the outside areas but currently I'm polishing the underground section.
Trying to find the most elegant way of doing complex arches I tested all kinds of displacement tricks but ultimately it didn't turn out the way I wanted. The canals levels from HL2 singleplayer came to my mind and I took a closer look at them only to realize that Valve just used good old brush techniques for even their most complex tunnels. I decided to give up on displacements and do it the "hard" way. The impact on FPS is more than acceptable.





