I've been thinking some about how the hex-grid universe of Traveller games can be justified through some nifty Jump Space Theory:
First, one has to start at the beginning. Jumpspace is a reality parallel to but separate from our own. However, jumpspace can be entered by penetrating the barrier between our reality and jumpspace in a similar fashion to how a needle can penetrates a person's skin.
Jumpspace is two-dimensional. When a three-dimensional object enters jumpspace, however, it creates a "bulge" in jumpspace, thus causing jump masking.
The galactic plane of the Milky Way causes a subspatial effect that causes any jumpspace travel to be aligned with the galactic plane. Thus, jumpspace travel maps can be made two-dimensionally.
First, one has to start at the beginning. Jumpspace is a reality parallel to but separate from our own. However, jumpspace can be entered by penetrating the barrier between our reality and jumpspace in a similar fashion to how a needle can penetrates a person's skin.
Jumpspace is two-dimensional. When a three-dimensional object enters jumpspace, however, it creates a "bulge" in jumpspace, thus causing jump masking.
The galactic plane of the Milky Way causes a subspatial effect that causes any jumpspace travel to be aligned with the galactic plane. Thus, jumpspace travel maps can be made two-dimensionally.