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qbsp3.txt
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qbsp3
31 May 1999
David Hyde (rascal@magnolia.net)
This version of qbsp3 is based on the original source code supplied by id
Software, modified by Raven Software for Heretic 2.
Neither id Software nor Raven Software supports the changes made to this
version of qbsp3.
Detail hint brushes
This change was suggested by Alexander Malmberg as a method for controlling
brush fragmentation, while not producing a lot of unecessary portals. This
change allows GenSurf (in particular) to produce detailed terrain surfaces
that are very r_speeds efficient and compile VERY quickly.
Bug fix to faces.c
Bug fix to faces.c discovered by Alexander Malmberg. This fix is described
in detail at http://frag.com/quest/doc/qbsp3_bug1.html. If you have any
questions concerning this change please address them to A. Malmberg at
alexander@malmberg.org. This fix will potentially lower r_speeds in a map
(though not much), prevent occasional visual errors, and possibly prevent
"WARNING: leaf portals saw into leaf" errors.
"Bounds out of range" checks
Fixed an error in map.c that prevented qbsp3 from correctly reporting
"bounds out of range" and/or "no visible sides on brush" errors for brushes
outside the +/-4096 limits in the Y or Z directions. The original source
code checked the X direction 3 times. This error was originally detected
(as far as I know) by Steven Boswell, and reported in his excellent article
at http://wdunltd.ml.org/whatis/Quake2/bspvis.html
Floating point support
Reads floating point numbers from .map files as floats, rather than
truncating to integers. All internal operations in qbsp3 have always used
floats. This change allows users whose editors (e.g. Quark) produce maps
with floating point values to use this version of qbsp3 without roundoff
errors. This change will have not cause any problems for maps containing
integer coordinates.
Clip brush bug
Added a change to WriteBSP to compensate for a bug in Quake2. This change
was developed by Alexander Malmberg. The short version: Q2 expects to find
at least one empty leaf in a .BSP file, but incorrectly thinks a leaf with
a clip brush in it isn't empty. If all of a maps leafs contain clip brushes,
Q2 displays the error message "Map does not have an empty leaf" and shuts
down. Note that this error generally only occurs in small test maps that
are mostly empty (so that the only leafs generated are those produced by
the default 1024 cuts). The change to WriteBSP adds a dummy empty leaf if
one is not present.
Lowercase texture names
Automatically converts all texture names to lower case. This will prevent
the upper case animated texture crash that occurs for shareware WorldCraft
users.
==================================================================================
Visual C/C++ 5.0 was used to compile the source code. No optimizations were used
(I'm paranoid).
******************* DISCLAIMER ******************************
* *
* I (David Hyde) make no warranties regarding the computer *
* program QBSP3.EXE. Users assume responsibility for the *
* results achieved for computer program use and should *
* verify applicability and accuracy. *
* *
*************************************************************