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