sorry, but here's another basic question. couldn't find anything in the other posts.
whenever i try to make a simple cylindrical room (either with the hollow-tool, or by building it up seperately, floor, circle-wall, top) i get leaks or at least the texture-seams between the faces look horrible in hl.
how is it possible to make a decent roundhall which does not cause problems?
the situation gets even worse when i try to cut out a hole in the ground (of course having another hull below), e.g. to make a tunnel to the level below, or to make a pool.
this copletely destroys the vertices and causes nuthin but leaks.