The rungs the ladder has below the canonical wavelength floor.
Coarsest first, from CANONICAL_DETAIL_FLOOR down to floor, and the same
construction as craterLadder: a cell holds one crater of its own size at
most, so halving the diameter and doubling the cells per axis reproduces the
−2 cumulative slope for free.
These are presentational and the contact test never sees them, which is
the whole of micro.ts. A ship's hull spans tens of meters and the deepest
thing in this list is a fifth of eight, so what the ship stands on and what
the eye sees differ by less than the landing gear — bounded by
microReliefBound and measured by micro.test.ts.
The rungs are numbered from MICRO_RUNG_BASE rather than continued from
the canonical ladder, and that is what lets a body with no canonical craters
have any. Numbering them by position in the body's own ladder needs a
largest crater to count down from, and largestCrater is zero on every
surface young deletes — Miranda, Enceladus, Europa. Anchored at a fixed rung
instead, the tail is a property of the body's size and air alone, its hashes
cannot collide with a canonical rung (the canonical ladder reaches nineteen at
its widest and is capped at fourteen), and a rung is the same rung on every body
of the same radius, which is what an eight-meter crater ought to be.
young does not enter and air enters harder, and both follow from the
timescale. A resurfacing event deletes a crater population, which is why
craterDensity multiplies by 1 - young — but retention at a meter is
geologically instantaneous, so the surface that has no kilometer craters
because it was paved last week is saturated at a meter by the following
afternoon. Europa is smooth at kilometers and rough at centimeters, and this
is the term that says so. Air is the opposite: an atmosphere screens the small
impactor and then fills the hole in, so it takes the small population out
first — Venus has nothing under three kilometers. (1 - air)⁴ is an ordering
fit rather than a measurement, and the order it reproduces is Luna 1, Mars
0.14, Earth 0.012, Venus 0.
There is a gap above this list on a body with large craters, and it is
MAX_CRATER_LEVELS rather than this. The canonical ladder stops at
fourteen halvings whether or not it has reached the floor, so a world whose
largest basin is 2,170 km has canonical craters down to 265 m and then
nothing until eight meters. Closing it is a deeper canonical ladder, which
moves the field the contact test integrates and is therefore a version bump
— the cap's own docstring carries the cost, and
ADR-0021 the argument.
- grammarSurfaceGrammar
- Undocumented
- floornumber
- Undocumented