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The light editor can be opened by typing "editLights" in the console or by pressing 'j' in Radiant (because you juice up the lights). You need to have a light selected in the editor for it to really do anything (or you can run around the level in game and select the lights from there). There are two types of lights in Doom 3. Point lights are kind of like a light bulb. There is a center point, and it lights up everything in some radius around that center point. The radius isn't actually spherical. It's actually a box aligned to the world axis. Projected lights are similar to spot lights in that they only shine in a single direction. Point lights
![]() By marking the light as parallel, the light acts as if the center is extruded out to infinity. All the shadows will go in the same direction, and all the highlights in the bumps will face the same direction. This is very handy for creating sunlight. The radius is x, y, z is quite simply the size of the light area in each of the 3 axis. Setting equalateral radius just means it's the same radius in all 3 directions. This is easy to see in the editor. I'm pretty sure fall-off doesn't actually do anything. Projected lights
![]() Other stuff
![]() The apply different button is for when you have multiple lights selected. Hitting apply different will only change the values on the lights that you changed. This allows you to do things like select a bunch of lights and make them all red without affecting the direction, texture, or other properties on them.
The best way to do it is to just hit F7 to pull up a real time render and play
around with all the various propeties until it looks good. There is really no
other way but through trial and error because it is all very subjective.
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