Get the two axes perpendicular to the section axis (for 2D projection).
NOTE: the Rust projection_outline::project (rust/geometry/src/
projection_outline.rs) MUST mirror this mapping + the flipped-U rule in
projectTo2D exactly, so winding-robust outlines coincide with the
cut polygons. Change both sides together.
Get the two axes perpendicular to the section axis (for 2D projection).
NOTE: the Rust
projection_outline::project(rust/geometry/src/ projection_outline.rs) MUST mirror this mapping + the flipped-U rule in projectTo2D exactly, so winding-robust outlines coincide with the cut polygons. Change both sides together.