Texture Mapping in Quake
Quake uses light maps in addition to texture maps. Texture maps are used to add detail to surfaces, and light maps are used to store pre-computed illumination. The two are multiplied together at run-time, and cached for efficiency.
Texture Maps
Light Maps
Data RGB Intensity
Instanced Yes No
Resolution High Low

Light map image
by Nick Chirkov.

Textures Only
Textures & Light Maps
Lecture 22 Slide 20 6.837 Fall '98