const DEFAULT_MAX_SCATTER_REGIONS: 96
How many regions one selection may hold.
A ceiling rather than a working limit, and it is the telephoto end that makes
one necessary: scatterRange goes as pixelsPerRadian, so the disk goes as
its square, and a 20° lens at 8× zoom asks for a thousand times the regions a
hover does. At the flight lens the answer is five — a 212 m range on Luna's
333 m regions — and thirty-three at the telephoto end, so this never binds on
a lens anything is flown behind, and where it does bind the far rocks simply
stop rather than the frame going away.