Three Dimensions

I mentioned in yesterday's post about my favorite science fiction roleplaying game map that Traveller's star maps are two-dimensional and that that's long been an issue for some fans of the game (though it mostly doesn't bother me). In the comments to that post, several readers mentioned the three-dimensional star maps included in GDW's 2300AD (né Traveller: 2300) and SPI's Universe. Here's the Near Star Map from the former, which covers a volume of space within 50 light years of our solar system:

Even at this small size, you can see there are a lot of stars included on this map. As it turns out, there are, in reality, even more stars within 50 light years of Sol, but GDW didn't have the benefit of our current astronomical knowledge. They worked from the then-quite good Gliese Catalogue of Nearby Stars from the '70s, which has since been updated many times (and perhaps even superseded). Still, I loved this map, which included XYZ coordinates for hundreds of stars, which provided lots of scope for exploration and adventure in the 24th century.
Much as I loved that map, though, my absolute favorite 3D star map came from SPI's Universe: This map included far fewer star systems and covered only a volume of about 30 light years from Earth. However, I probably spent far more time poring over this map than 2300AD's. The reason for this is quite simple: I encountered the Universe map first, making it perhaps the first three-dimensional star map I'd ever seen. Unlike 2300AD, I never actually played Universe, but I read the one-volume, softcover edition of the game released by Bantam Books cover to cover multiple times. The pull-out star map left a lasting impression on my thirteen-year-old self.
I love the idea of using a properly three-dimensional star map in a science fiction roleplaying game. Nowadays, the availability of much better astronomical data and personal computers with useful software, employing 3D maps is probably easier than it's ever been. Despite that, I've never refereed or played in a long-running SF RPG campaign that made use of them. I don't know why that is or if it's likely to change anytime soon. I have very vague ideas of following up my ongoing Twilight: 2000 campaign with a 2300AD one, but that's still some years in the future, if ever.
Has anyone reading this made a good use of three-dimensional star maps in their roleplaying games?