Subdivision level for an icosahedron (asteroid/comet) — 0 is the
deliberately-faceted "rock" look this engine wants at a normal viewing
distance; higher subdivisions round that off as the body fills more of
the screen, the same idea as sphereDetailFor but for a shape whose
low-detail form is an intentional stylistic choice, not just cheapness,
so it only needs to soften at the extreme close range true-scale makes
reachable.
Subdivision level for an icosahedron (asteroid/comet) — 0 is the deliberately-faceted "rock" look this engine wants at a normal viewing distance; higher subdivisions round that off as the body fills more of the screen, the same idea as sphereDetailFor but for a shape whose low-detail form is an intentional stylistic choice, not just cheapness, so it only needs to soften at the extreme close range true-scale makes reachable.