by mh » Mon Aug 24, 2009 11:16 pm
The best way is through qbsp modifications. It should be very possible to port over a lot of the features of more advanced versions and still retain full Quake bsp compatibility (even in classic ID Quake engines). Stuff like areaportals would be out as they would require a PVS change at runtime, but detail brushes, static vis occlusion brushes and so forth - I see no reason why not.