@mid_gen](https://forums.unrealengine.com/member.php?5136-mid_gen) hmm… a slightly different thing: as I see and thinking, apparently on a spherical surface triangular “tiles” and “clusters” would be the best for a (RTS) pathfinder. do you have any source/article how you generated the vertices and triangles to produce the sphere? I would need it to help to determine the coordinate-tile conversions in both ways - but it will be a really far future hobby task for me (but quite interesting!) 
collecting tiles into areas/clusters seems to be very similar to the lod generation you use.