Asking whether an edge already exists scanned the whole edge list, so
building a graph of E edges cost O(E^2). A visibility sweep adds a quadratic
number of edges, so the whole construction was cubic: 600 satellites took
twelve seconds. An index of outgoing edge positions makes the membership
test constant time, and the same index answers neighbours and out-degree
without a scan. Removal rebuilds the index in one pass, since it renumbers
every later position. Six hundred satellites now take 130 ms, a factor of
ninety five.
Thirty four crates listed apsis-core or apsis-math without referencing it,
and apsis-kepler listed apsis-time and apsis-tle as well. Each was verified
removable by compiling with it taken out. An unused dependency still costs
build time and makes the dependency graph and the layer check report
relations that do not exist. The layer check now reports 104 edges, down
from 141.
ApsisRS contributors