Katharsis is a first person gothic novel game with Stealth and RPG elements, based on the DarkPlaces engine.
Another old vid of the time when Katharsis was still based on RTCW (years back from now).
Here i experimented with highres lightmapping via q3map2,
featuring pre-baked radiosity, fake bumpmapping and fake ambient-occlusion on several external 1024x1024 lightmaps.
Compile settings for the lightstage: -patchshadows -samples 4 -samplesize 1 -thresh 0.2 -dark -dirty -bounce 2.