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THE EDITOR
OPENING THE EDITOR
To use the Doom3 editor, you first have to launch doom3, then the console with the keys:
ctrl+alt+²
You also have to switch to the window mode with the commands:
r_fullscreen 0 (r_fullscreen 1 to return in fullscreen)
vid_restart
Now you can type the command:
editor
If you are going to use it a lot, you can bind a key to quickly switch between the fullscreen and the window mode.
To do that open your "C:\Program Files\Doom 3\base\DoomConfig.cfg" file and replace the line
bind "F10" "....
by the line
bind "F10" "toggle r_fullscreen; vid_restart"
ADVICES FOR EDITING
If you don't want to make a "laggy" map you have to know some things.
-A bloc must only have textures on its visible faces;
Its other faces must have the "caulk" texture (transparent so doesn't take any memory).
-By default the game doesn't know at all what to show or not; so maps are cut in small rooms and the game needs only to show the room you are. That is the portal bloc which can do that. A good example is a door with a portal between two rooms;
Also try not using a wall for two rooms.
without portal:
with portal:
-Prefer several small walls from a big one because the light will take less memory.
with one big wall:

with several small walls:
-You can verify portals with the command:
toggle r_showtris 0 3
-You can verify the light with the command:
toggle r_showlightcount 0 1
You can also bind some keys to quickly switch between test modes and normal mode.
To do that open your "C:\Program Files\Doom 3\base\DoomConfig.cfg" file and replace the lines:
bind "F1" "…
bind "F2" "…
by the lines:
bind "F1" "toggle r_showtris 0 3"
bind "F2" "toggle r_showlightcount 0 1"
To have the best example of a good work, you can open the pk4 archives from your Doom3/base directory with winzip (for example) and extract the files you want.
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