I've been using Rhino 3D to create buildings for my coasters in No Limits, and when I import them into the track, only 3 of the 4 sides are visible - 1 side is always completely black due to the environment lighting (I think). Is there anything I can change either in the 3d program or No Limits to get all sides to show or is it just the way No Limits renders it? Just wondering if anyone has had any similar problems or any ideas, thanks!