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r fullbright
From Quake Wiki
Template:lowercase-underscores
| Default value: | "0" |
| Saved to config.cfg: | no |
r_fullbright is a boolean variable, (1 is on, 0 is off) which turns on or off the precompiled lighting on a map. If you set it to 1, every shadow will disappear and everything will be extremely bright. 99.9% of the time, this is ugly, but this command is sometimes useful if you are creating a map and want to test it without finishing all the lighting, or if you want to "cheat" in an unnecessarily dark level.
Keep in mind that changing r_fullbright in Software Quake has an instantaneous effect, while in GLQuake you will have to restart the level (use the restart console command) for it to have effect.
{{Console variables]]