This means a leaf could see into itself, which by itself isn't an
error.
However, I recently had a lot of problems with this warning in a
complex,
underwater cave, and Quake 2 didn't want to draw all polygons that
were
supposed to be visible. This is due to a bad PVS. If you think you
have
such an error, try setting r_novis to 1. If the error goes away, this
is your problem. I have reason to believe that this indicates that
your
map will have problems with a bad PVS, but often, you won't notice it
while
playing the level.
Getting rid of this warning is tough. You can try to make brushes in
the trouble area detail brushes. If the area is complex, you can
also try inserting a few strategically placed hint and skip brushes
(placing these is also a tough one). You can also try to simplify
the area.
Regarding the Leaf portals saw into leaf error on the RUST site, I've found
the information presented already, is pretty much correct, and by some
experimenting here's what I found about what causes and how to correct this
error:
Take for example, a rectangular hallway, and rectangular room. When you
have cut a hole in a wall of the room, big enough to slide the hallway into
(instead of making it flush with the wall) you are basically taking one
viewable area (according to PVS) and inserting it in another. Essentially,
you have two hollowed out volumes that intersect. Volumes of this type
CANNOT intersect (this is also one cause of the AREAPORTAL doesn't touch 2
areas error). To VIS, it is sort of like looking into two seperate areas at
the same time, while being in both at the same time--not possible.
The two volumes can meet each other and be flush however. To fix the error
(in this example) you need to cut the hallway brushes along the outside edge
of the room. Essentially what you have left, is a hallway, which will meet
flush against a room (which has part of the hallway in it). This should
work for any type of "intersecting volumes."
By default, a WARNING will not stop you from compiling a level with all the
features. This particular QVIS warning has EXTREMELY bad side-effects and
so it is highly recommended the warning be eliminated. Side effects are as
follows:
1. VIS time. Your VIS time can increase up to 50 times at least, even for
moderately sized/designed maps.
2. Final .bsp size. Your final .bsp can be 40% or more LARGER than the
same map without the warning. In my tests, I used a 1200 brush map, which
normally would be about 2MB. With the error, the size was about 3.45MB.
The only difference between the two was the hallway was sliced in the 2MB
map, making it about 6 brushes larger than the map in error.
NB: The error may not necessarily appear right away (i.e. be reported as a
warning) but the side-effects might begin happening, and only become full
blown when the warning appears.
Some pretty bad side-effects, huh?-Joel Caesar
