This document tells level editors and creators about the limits and size specifications of Doom

Doom Metrics
————
Scott Ampoker (scott@basis.com)

Creation of a successful Doom level requires that the PWAD designer be aware of the “physical” sizes and limitations of the Doom world. On a less critical level, the choice of wall, floor, and ceiling textures will have some influence on room dimensions. This document is primarily concerned with physical limitations. This document is not complete,
and as I explain below, it is not absolute either. I regret that I haven’t determined the map limits of a Doom level. The data structures would appear to allow grid coordinates as well and floor/ceiling heights from -32768..32767. However, map editors impose stricter limits.

To determine physical limitations, I created a simple level with three sectors resembling this:

*———–* *————*
| | | |
| *———* |
| | | |
| *———* |
| | | |
*———–* *————*

By manipulating the height and width of the center sector I was able to determine minimum clearances. While it was easy to perform tests with “the player”, it was a little trickier testing the various enemies. I had to get an enemy to chase me through the center hallway. Unfortunately, this does not lead to definitive results. If the width of the hallway is
near the minimum limit, the enemy is far less likely to enter the hallway within a short period of time. This would give the false impression that the hallway is already too narrow. I advise PWAD designers to allow extra clearance if it is intended that enemies move easily from one sector to the next.

After performing most of my tests, I received the April 13 version of “The Unofficial Doom Specs” by Matt Fell. Unlike the earlier version I had been using, this version provided the actual width and height of each object. I found this useful in comfirming most (but not all) of my test results and for filling in the missing data on the Spiderdemon which I
hadn’t tested at all. (Many thanks to Matt for his invaluable contributions). It appears that the minimum width through which an object will pass is greater than the actual diameter of the object. For example, The 32-wide player requires a width of 33 (although Fell reports a minimum width of 34). I will list the physical dimensions as well as the minimum clearances I have actually seen work. I left a value empty (“-”) if I hadn’t satisfactorily established a minimum.

MINUMIM
ACTUAL CLEARANCE
OBJECT HEIGHT WIDTH HEIGHT WIDTH
—— —— —– —— —–
Player 56 32 56 33
Trooper/Sarg 56 40 56 44
Imp 56 40 56 44
Demon/Spectre 56 60 56 64
Cacodemon 56 62 56 64
Lost Soul 56 32 56 -
Baron 64 48 64 -
Cyberdemon 110 80 110 -
Spiderdemon 100 256 - -

NOTE: Rising doors stop 4 units short of the neighboring ceiling. In order to ensure the minimum doorway height of 56, the neighboring ceiling should have a clearance of at least 60.

ANOTHER NOTE: When passing from one sector to the next, an object must fit between the higher of the two floors and the lower of the two ceilings.

STEPS AND STAIRS

It appears that any creature with legs can step up as many as 24 units at a time. (I haven’t verified this with the Spiderdemon). As we all know, the player can step down from any height. Enemies appear to be limited to descending at most 24 units at a time. (Floating enemies aren’t constrained by steps).

Although a simple step up or down is easy to handle, stairways arefar more complicated. I figured that the depth of each step (the distance front of one step to the front of the next step) had to be a factor. The test results confirmed this but were confusing at best.

The player can climb steps with a depth as *narrow as 1*! This could be creatively used in PWADS since it would appear that the player is scaling a sheer wall.

Enemies are much more picky about steps. For example, I discovered that a trooper would descend stairs that had a minimum step depth of 33 with the maximum riser height of 24. When I changed the riser height to some smaller value, the mimimum required depth got smaller too. I gasped in horror realizing the amount of work it would take to figure out the magic formula, by trial and error, for each enemy. For what it’s worth, the following table shows the minimum observed depth for 24-unit risers. You can assume these to be a safe values for any smaller riser. If your creatures appear to be afraid of the stairs, try adjusting the riser to depth ratio to create a kinder and gentler stairway. (I did not test the
Cyberdemon or the Spiderdemon in this area.)

OBJECT MINIMUM STEP DEPTH WITH 24-UNIT RISER
—— ————————————-
Trooper/Sarg 33
Imp 33
Demon/Spectre 51
Cacodemon N/A
Lost Soul N/A
Baron 41
Cyberdemon -
Spiderdemon -

WALL/ROOM DIMENSIONS

Unlike the physical limits described above, wall/room dimensions are determined more by aesthetic factors than by numerical requirements. However, in the absence of hard rules, there are magic numbers and standard situations that come up from time to time. It is not practical to cover every situation here. When in doubt, you should always examine any of the stardard Doom levels for guidance. It is helpful to always think in powers of 2. Doom level editors should provide a user setable snap grid adjustable down to 8 units.

Room sizes are, of couse, entirely arbitrary. However, hallway and corridor widths are commonly 64 or 128 units wide.

Most general wall textures are 128 x 128 units. The manner in which the wall textures are rendered is described in a separate document (MANAGING TEXTURES AND THE “UNPEGGED” ATTRIBUTE). The use of “unpegged” attributes and X, Y offset modifiers enables the PWAD designer to satisfactorily use these wall textures on any wall space.

Some of the available wall textures have more specific uses such as doors, switches, decorations, and wall thickness filler. Doors are usually 64 or 128 units wide. Door heights can vary. 72 units seems to be a common door height in the standard Doom levels.

Decorations and switches normally appear on wall textures that are 64 units wide (a few are 128). When placing these textures on non-standard wall widths, the decoration/switch will not appear centered without adjusting the texture X-offset.

Wall thickness filler is used on the insides of door tracks, windows, and the occasional alcove. Textures intended for such use normally 8 or 16 units wide but are designed to tile well with non-standard wall thicknesses and heights.

Special stair riser textures are 8 and 16 units high. However, any texture may be used on a stair riser.

FLOORS AND CEILINGS
——————-

The textures used for floors and ceilings are all 64 x 64 units. Unlike wall textures, floor and ceiling textures are aligned and oriented with respect to the underlying map coordinate grid. Since these textures are tiled globally, they will always create seamless transitions from one sector to the next (assuming the adjoining sector has similar floor/ceiling textures).

Some floor/ceiling textures have specific markings on them that are important. For example, some ceiling textures have a grid of lights. To ensure that the ceiling lights in a sector tile correctly, not only must the sector size be a proper multiple of a single light, but the sector itself must be placed on the map at an appropriate grid line.

A transporter pad has a special design. In order for the image on the transporter pad to appear correct, the pad must be aligned on a 64 x 64 map grid.

There are some special stair step textures (STEP1 and STEP2). These could be used for the top surface of each stair. If you wish to use these textures for your stairs, make sure you pick the texure with the proper north/south or east/west orientation and snap your stairs to a 64-unit width and a 32-unit depth.

REAL WORLD SCALE
—————-

Occasionally, a PWAD designer wishes to create a Doom level based on an actual place (such as his office building or home). I undertook such a project using the actual blue prints as my reference. This creates the problem of equating Doom measurement units to real world units. There is no magic formula. The Doom engine does not appear to render things with consistant aspect ratio. For my project, I found that the following scale produced a satisfying result that “felt right” when walking through the level:

16 Horizontal Doom units = 1 horizontal foot
10 Vertical Doom units = 1 vertical foot

You may wish to experiment with these values to suit your tastes. The vertical scale seems to be the hardest to pin down. Heights look different in Doom depending on whether the player is near or far from the feature in question.

Doom levels usually come with a specific template of information telling you about the level, its compatibility and build issues and what to expect.

Doomed to Run Amok was one of the coolest levels included in the D!ZONE 150 CD-ROM from Wizard Works. It includes new graphics and sounds!

=======================================
Title: DOOMED to Run Amok v1.0
Filename: AMOK10t.WAD (t=Total Build, with Sound, Music, etc.)
Author: David L. Davis
Email Address : (None)
Misc. Author Info : In late 30′s, SR. PC Programmer / Analyst, and bitten with “DOOM” madness!

Description: Waste the “BAD GUYS”, what else?.

Additional Credits to:
id Software Team (DOOM “The Game” / “The Graphic Engine”)
Brendon Wyber (DEU v5.21 / Map & Thing Editor)
Raphael Quinet (DEU v5.21 / ” ” ” ” )
Colin Reed (BSP v1.2x / DOOM Node Builder)
Bill Neisius (DMMUSIC v1.0a / Music Util)
Bill Neisius (DMGRAPH v1.0 / Graph Util)
Bill Neisius (DMAUD v1.1 / Audio Util)
Matt Fell (The “OFFICIAL” DOOM FAQ v5.6 / Info)
Matt Fell (The “UNOFFICIAL” DOOM SPEC v1.3 / Docs)
MDC Development (TEXTREF v1.0 / Docs)
Brain Marshall (DOOM 3D Engine Techniques / Info)
=======================================

* Play Information *
Episode and Level #: E2M1
Single Player: Yes
Cooperative 2-4 Player: Yes *Not Tested*
Deathmatch 2-4 Player: No
Difficulty Settings: Yes
Exit Level: Yes (That’s if you can get by the Cyber-Demon!)
New Sounds: Yes, Replacement Sounds for Plamsa Gun, Rocket Launcher, and a few others.
New Graphics: Yes (Status Bar now has a Marble Face), a new TekDoom Door, and TekCude (Wall Textures)
Special Graphics: a Preview of a few Villains from DOOM II within a hidden secret room. (Wall Textures) (“DOOM II …its going to be HELL on EARTH!!”)
New Music: Yes, (New Age – Title Unknown)
Demos Replaced: None

* Construction *
Base: Brand-Spanking New level from scratch
Build Time: 180+ hours (Every free moment for a month, course rebuilds can take a little while on a 386DX/25 Mhz machine with a Big WAD like this one!!.) Plus the time to learn how to use DEU, BSP, DOOM Utils, and reading all the DOOM information out-there!
Editor(s) used: DEU v5.21, BSP v1.2me (a Recompiled version of BSP v1.2x with Math Emulation Support) DMMUSIC v1.0a, DMGRAPH v1.0, & DMAUD v1.1
Known Bugs: Some Texture Alignment Problems.

* Copyright / Permissions *
Authors may NOT use this level as a base to build additional levels, but portions of this level may be “cut and pasted” into your own base levels if original authorship is placed within the “Additional Credits” section.

You MAY distribute this WAD, provided you include this file, with no modifications. You may distribute this file in any electronic format (BBS, Diskette, CD, etc) as long as you include this file intact.

Download Doomed to Run Amok

We have two huge additions to the tech section coming April 1.

First, we’re throwing up a Doom Page, with docs, levels, programs and all kinds of lost pieces of data celebrating the Doom universe which gave us the FPS gaming genre.

We’ve found old FAQ’s, thousands of old PWAD levels, level editors, total conversions and share versions of new episodes like Hell2Pay. And we’re gonna give’em to you.

To kick off the happy feeling of Doom, I’m giving you all a glimpse of the page and letting you download the Doom 95 Windows front-end with Doom1.wad shareware attached.

The second new addition to Blast’s tech pages is The Drop Folder.

In college, I did my workstudy with Northeastern’s “RESNET” computer team. We always had our “Drop” folder (or CD, flash drive, etc) that contained the tools and programs that we felt were absolutely vital.

I’m expanding that a bit — beyond just utilities like Hijack This! and stuff — to include a well-maintained list of programs and tidbits that make your life easier. And actually, I could use some help. If you know of a program or download that makes your life easier, leave a comment on this article and let me know about it!!

I’m already figuring on including some wicked good apps like FileZilla Portable, DOSBox, Pidgin, the latest build of WordPress and I have some goodies saved up that you’ll see in April. I’m hoping to make this an active list of nerdware and a one-stop place to pull your vital apps from the web without complicated sign-ups or long waits.

We also just installed drop-down menus. Let me know if there are any problems!

-jg