Function millimetre_column

pub fn millimetre_column() -> Fixture

The ADR 0014 near-degenerate half-space column, in millimetres.

A 250 x 250 x 11940 mm column clipped by a plane tilted 2e-9 off axis. The historical failure was a flyaway: output escaping the input bounds by kilometres. See docs/adr/0014-adopt-boolmesh-mesh-boolean.md.