I was one of the Environment Artists who worked on the game. For the most part, every artist had a hand in every map.

The process was straightforward back then; everything was created in 3DS Max, and there was an exporter for the Vicious Engine that would export all the materials and textures into the engine. The version control was also simple, as you check in and check out the specific areas you have worked on, but not as intuitive as today's version control.