The router began as a port of FreeRouting and has grown its own engine
(negotiated congestion, tree nets, exact checks, axis escapes), and
'freeroute' was one letter from the project it no longer follows. The
package, module and command are now rpmroute; the freeroute command stays
as an alias, and the RPMROUTE / RPMROUTE_ORACLE_JAVA variables fall back
to the old FREEROUTE names. Version 2026.10.07. Routing is unchanged: a
PCBench board routes to a byte-identical session either way.
Add diagonal_win.dsn: a 45-degree pin-to-pin net with a keepout placed inside the
diagonal's bounding box but clear of the true thin copper. Orthogonal routing
connects it with a Manhattan-length staircase (1600000); diagonal routing
replaces that with a single 45-degree trace at the ideal hypotenuse length
(1131371) -- a 29% reduction -- DRC-clean via the search tree and via an
independent reconstruction of the emitted 45-degree copper's clearance octagon.
test_exact_clearance_is_load_bearing shows the keepout overlaps the coarse
bounding box but not the exact octagon, so the exact clearance (not the box) is
what lets the diagonal route. Determinism, endpoints-on-pads, valid SES, and
diagonal-off-equals-orthogonal (additive, over four fixtures) are covered.
rsp2k