Posted by Vizzini on April 21, 1998 at 17:28:51:
Okay, a lot of people seem to be confused about why their lighting doesn't show up in Jed. The reason is because you have "fully lit" selected! When you select "fully lit," it means that every point in the level has a light value of 1. Note that this does NOT affect the actual level, only what you see in the 3d preview. Turning it on is useful for such things as texture-aligning, which can be tough in those dark corners and the undersides of ramps, but you should usually keep it off.