Serious Use of Game Technology

In the forums on CGArchitect.com there has been discussion, by professionals in architectural visualization, of experiementing with importing architectural computer models into Doom or Quake to allow the user true interactivity, rather than providing the user with a pre-determined walk-through. This is another example of the fact that game technology is providing serious and useful applications. I think it is only a matter of time before the interractive technology of games will play a big role in architectural visualization. I want to learn the skills, so I will be ready.