3D Traveller

It may appear that distances in a 3D universe are smaller, but I tend to
think that's an artifact of the way worlds are generated.  In the solar
neighborhood, the stellar density is about 1 star/cubic parsec, but what
fraction of these have planets at all (much less "worlds")?

The 2D method of a 50% probability per hex must include stars above and
below this plane, so if you just stack standard sectors on top of each
other you're generating too many worlds.  So the distances between
worlds may have decreased, but to compensate you really should make them
more sparse.

The way 3D space was treated in Space Opera was that each world on the 2D
map got a z-coordinate.  This made the bookkeeping fairly easy, and didn't
seem to generate worlds which were too close.  The world in the adjacent hex
might be very far away if one has z=+10 and the other z=-23.

Martin Snow
[email removed]