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<title>viDOOM - Free Software DOOM editor</title>
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<body>
<h1 align="center">Glossary</h1>
<p>It is assumed that some knowledge of DOOM is known by the
reader, but in case here are some general terms that are used in
the documentation. </p>
<h2><a name="WAD">WAD</a></h2>
<p>A WAD file is the name given to the files used to define the
graphics, sound, music and maps that make up a game of DOOM. WAD
files are split into two different types, <a href="#IWAD">IWAD</a>
and <a href="#PWAD">PWAD</a> files. </p>
<h2><a name="IWAD">IWAD</a></h2>
<p>An IWAD file is is the 'Internal WAD' file. The IWAD file is
the main <a href="#WAD">WAD</a> file as supplied by id Software.
Note that only id Software are meant to produce IWAD files. </p>
<h2><a name="PWAD">PWAD</a></h2>
<p>An PWAD file is is the 'Patch WAD' file. This WAD file is read
in by the game after the IWAD file, and an entries in it replace
entries defined in the IWAD file. So for instance a PWAD file
that has an entry for the first <a href="#MAP">MAP</a> will mean
that DOOM will read the first map from the PWAD file, rather than
it's own IWAD file. </p>
<p>Hmmmm.... Sure I could have explained that better. </p>
<h2><a name="MAP">MAP</a></h2>
<p>A map is taken to mean a DOOM level. Note there is two naming
conventions for maps, <b>E</b><b><i>x</i></b><b>M</b><b><i>y</i></b>
(where <i>x</i> is the episode number, and <i>y</i> the map
number in that episode) used in DOOM and Ultimate DOOM, and <b>MAP</b><b><i>nn</i></b>
(where <i>nn</i> is a number between 01 and 32) used in DOOM 2
and Final Doom. </p>
<p>A map is made up of a number of different elements, namely <a
href="#SECTOR">sectors</a>, <a href="#LINEDEF">linedefs</a>, <a
href="#SIDEDEF">sidedefs</a>, <a href="#THING">things</a> and <a
href="#VERTEX">vertexes</a>. Following are some (very) basic
definitions for these things, but you would be better reading the
<a href="thanks.htm#DOOMSPEC">Unofficial DOOM specs</a> for more
accurate definitions. </p>
<p>MAPs generated in viDOOM must be built with a <a href="#BSP">Node
Builder</a> before they can be used in DOOM. </p>
<h2><a name="VERTEX">VERTEX</a></h2>
<p>A vertex is simply an X,Y co-ordinate in the DOOM world. </p>
<h2><a name="THING">THING</a></h2>
<p>Things are all the different objects on the DOOM map that are
not the actual walls and doors. All the monsters, weapons, ammo,
non-wall based scenery and even your starting point and teleport
locations are all counted as THINGS in DOOM. </p>
<h2><a name="LINEDEF">LINEDEF</a></h2>
<p>A LINEDEF is a line that connects two <a href="#VERTEX">vertexes</a>.
A LINEDEF at it's most basic is used to make up the walls that
make up the DOOM levels. A LINEDEF must <i>always</i> have a
right <a href="#SIDEDEF">SIDEDEF</a> associated with it. 2 sided
LINEDEFS will also have a left SIDEDEF associated with it. </p>
<p>In addition special types of LINEDEF can be used so that when
the player crosses or activates them actions happen in the DOOM
world - lighting changes, teleportation happens, doors open,
levels are exited and so on. </p>
<h2><a name="SIDEDEF">SIDEDEF</a></h2>
<p>A SIDEDEF is basically used to describe the <a href="#TEXTURE">textures</a>
that are painted upon a <a href="#LINEDEF">LINEDEF</a>. </p>
<h2><a name="SECTOR">SECTOR</a></h2>
<p>Though technically incorrect, it is simplest to picture a
SECTOR as an object enclosed by <a href="#LINEDEF">LINEDEFS</a>.
A sector is used to define the floor and ceiling heights and <a
href="#FLAT">flats</a> used to draw the floor and ceiling, in
addition to the lighting for that area. </p>
<h2><a name="TEXTURE">TEXTURE</a></h2>
<p>A texture is the graphics used to paint the walls in DOOM. </p>
<h2><a name="FLAT">FLAT</a></h2>
<p>A flat is the graphics used to paint the floors and ceiling in
DOOM. </p>
<h2><a name="BSP">Node Builder</a></h2>
<p>Does some of the nastier work of level building by creating
the extra information over and above the parts mentioned in <a
href="#MAP">MAPS</a> so that DOOM can actually understand the
level data enough to play it. </p>
<p><a href="thanks.htm#BSP">BSP</a> is perhaps the best known of
these, and the one that was used all through viDOOM's
development. </p>
<p> </p>
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<p><tt>$Id: glossary.htm,v 1.2 2000/07/18 16:49:48 dosuser Exp dosuser $ </tt></p>
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