HOW TO GET THE MAP EDITOR WORKING IN DOOM III
The leaked alpha has a built in map editor

And we are gonna get it to work ladies.
You need to do the following things to make it work, muhaha
Maybe there is a different way to do it , but the following steps made mine work ok ......
1. put the whole Doom_III in the root ( C:\ )
2. rename the doom.exe file to Radiant.exe
3. rename the C:\Doom_III dir to C:\Doom
4. Make a dir and call it scripts place it in the C:\Doom\base
5. Create a text file and save it as doom.qe4 and place this file in the C:\Doom\base\scripts directory
6. open doom.qe4 with notepad and cut paste the below text in it.
{
"basepath" "c:\doom\base"
"rshcmd" "c:\doom\base\"
"remotebasepath" "c:\doom\base\"
"entitypath" "c:\doom\base\def\*.def"
"texturepath" "c:\doom\base\textures"
"autosave" "c:\doom\base\maps\mre\"
"bsp_Relight" "!kpbsp -onlyents $ && !kprad -gamedir c:\doom\base\ $"
"bsp_Entities" "!kpbsp -onlyents $"
"bsp_FullVis (qrad -extra)" "!kpbsp $ && !kpvis $ && !kprad -bounce 4 -extra -gamedir c:\doom\base\ $"
"bsp_FullVis " "!kpbsp $ && !kpvis $ && !kprad -gamedir c:\doom\base\ $"
"bsp_FullVis (norad)" "!kpbsp $ && !kpvis $"
"bsp_FastVis" "!kpbsp $ && !kpvis -fast $ && !kprad -gamedir c:\doom\base\ $"
"bsp_FastVis (bleed)" "!kpbsp $ && !kpvis -fast $ && !kprad -nostopbleed -gamedir c:\doom\base\ $"
"bsp_only (novis/norad)" "!kpbsp $"
}
7. goto the dir c:\Doom\base\maps and create two directories named mre and mal
8. start Radiant.exe and hit the console key ~
When your in the console type editor
that's it folks !
If you want the default settings delete or rename the editor.cfg file in c:\doom\base
If you want to use that editor.cfg ( the settings of idsoftware team ) you will have to change the bottomline to seta ModelPath "C:\Doom\base\models\mapobjects\cpu\comrack2.lwo"
When the editor starts and it ask's for the doom.qe4 file... just point to it
Hope this works for you guys as it works for me
have fun
MULTIPLAYER WORKS!!!
2 different methods...for the first, consult this quick guide:
DooM ]|[ alpha Multiplayer faq
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Note: You don't need to use the exec runact.cfg command. That information was originally posted on this site, very early on. It has since been discovered that the command is not necessary. Please let people know; there's no use in having to wait for five minutes every time you load the game.
New instructions to get up and running (basic solution, for tweaks see further down the page) :
After you unrar, just go to the Doom_III\base directory, and DELETE the DoomConfig.cfg file. Then launch doom.exe. The game will rebuild that config file and give you better default settings.
To interact with the game at this point, you'll be using the console. Press the tilde key (~) once you're at the main screen.
INDEX
Loading Maps
Controls and settings
Popular Commands
Recording demos
Making a demo into an avi
Important Links
Cheats / Hints
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Loading maps
From the console, use the following commands:
map e3/intro (Loads intro movie)
map e3/e3_1 (Loads first map)
map e3/e3_2 (Loads second map)
map e3/e3_3 (Loads third map)
map fred/e3bathroom5 (doesn't work for most people)
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Controls and settings
Type: bindlist
This will list all the currently bound keys and their functions. Use the page up and page down keys to scroll through the list. As long as you deleted the doomconfig.cfg before you started up, your settings should be pretty good.
To change any of these settings, you can either type in different values from the console, or just manually change the doomconfig.cfg with a text editor.
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Popular commands
Checking FPS: type com_drawfps 1
Bump Mapping on/off (try switching back and forth, you'll see the changes):
r_useStandardGL 0 (this turns bump mapping ON)
r_useStandardGL 1 (this turns bump mapping OFF)
Dynamic shadows on/off (BIG performance difference):
r_shadows 1
r_shadows 0
Changing resolution:
r_mode 1 (400x300)
r_mode 2 (512x384)
r_mode 3 (640x480)
r_mode 4 (800x600)
r_mode 5 (1024x768)
r_mode 6 (1152x864)
r_mode 7 (1280x1024)
NOTE: Changing resolution will not take effect until you either restart the game, or type vid_restart
Changing bit depth:
r_colorbits 16
r_colorbits 32
Fullscreen on/off:
r_fullscreen 1
r_fullscreen 0
Mouse Sensitivity:
sensitivity X
Where X is a number between 1 and 10. The default is 5....you can actually go higher than 10, but it gets kind of ridiculous.
Invert Mouse:
m_pitch -0.022
The default setting is m_pitch 0.022, all you need to do is add the negative sign.
Third Person view:
pm_thirdperson 0
pm_thirdperson 1
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Recording demos
I haven't seen this posted anywhere yet, so I figured I'd draw up a quick how-to.
Type the following:
bind F5 recordDemo
bind F6 stoprecording
These two binds will give you keys for starting and stopping a demo, respectively. You can substitute in the keys you prefer, it doesn't matter. In this case, when you want to start capturing the action in the game, press F5. When you're done, press F6.
The demo files are stored in your Doom_III\base\demos folder. They will be labelled incrementally, e.g. Demo001.demo, demo002.demo, etc. To play back your demo within the game, type playdemo demo001 (or whatever the demo filename happens to be).
However, to get your demo into a movie format, there's a few extra steps.
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Making a demo into an avi
After you've got a good demo, type aviDemo (for example, aviDemo demo001).
This will play back your demo while taking a whole bunch of screenshots. When it's done, exit the game and look in your "Doom_III\base\demos\demoname" folder. Depending upon how long your demo was, you could have anywhere from 100mb to 10 gigs of .tga files.
Download this program and run it:
http://www.css.tayloru.edu/~btoll/f99/350/res/pjBmp2Avi.zip
From the program's main screen, in the Directory field, type in the path to your demo's screenshots folder. (The "Doom_III\base\demos\demoname" I described above). A quicker way is to click the "..." button and just browse to the directory.
Change the file option from BMP to TGA. You should then see a list of all the screenshots appear in the "Files" field.
Under "Output" options, type the path and name of the avi you wish to create (e.g., "C:\movies\doom3rocks.avi")
Leave the default Frame and Key Rates (if any of you movie experts suggest a better setting, let me know).
Click the create button. A new window will pop up, prompting you to select a video codec. I suggest you use Divx 5.0.2. After you click OK, the program will compile your .tga files together.
After the window closes, you're done! Go to the target directory you specified, and watch your first Doom 3 movie =)
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Important Links
Screenshots, more hints:
http://meineseite.i-one.at/fz80297/test/doom3a.htm
More screenshots:
http://thebuzzer.reallyrules.com/doom3/
Text file with cvars:
http://folk.uio.no/magnusn/doom3/cvarlist.txt
Tweaking thread:
http://64.81.178.14/~K8a7a000/A1/F4/article/0/134994
Source of the leak??
http://www.geeknewz.com/comments.php?catid=1&id=2030
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Cheats / Hints
The keycode for the pad in level 2 is "924"
The codes from Q3 are still in the game at this point, but if for some reason you aren't familiar with them, here's a quick list (again, these are typed from the console):
God mode: god
Extra health: give health
Weapons: give weapon_weaponname (e.g. rocket launcher, plasmagun...some of these will crash)
Fly through walls: noclip