It's totally playable as is, though not finished, and I'm having a couple problems that I'm at a dead end in solving.
(1) I still can't run a full vvis on the map. I suspect that the level is encased in a huge skybox has something to do with this, but since it's an outdoor map it cannot be helped. I tried sectioning off the level (since it's so tall) with a couple func_areaportalwindows, and this certainly helps the level from running too slow when you're on the rooftops, but full vvis is still being annoying. I have also isolated and removed (or turned to func_detail) all solids which caused vvis -fast to say "WARNING: Cluster portals saw into cluster", though I'm not sure that has helped any. As far as I can tell there are no leaks.
(2) There are a few brushes in the plaza area which, while lit by any nearby light_spots, are completely dark to the light_environment even though they're supposed to be in direct sunlight. I've never heard of this happening before, so I've provided some screenshots. First pic, you see the plaza, certain brushes strangely dark. Second pic, you see the equivalent area in the 3-D skybox, demonstrating how the plaza is SUPPOSED to look.
Incidentally, for the time being you can download this version of the map here: http://www.furnation.com/singe/hl2/dm_wtc_singe_v1d.zip







