pub fn tangent_to_kept(
spec: &BodySpec,
replaced: &[bool],
) -> GeopResult<Option<(usize, usize, usize)>>Expand description
A face to be put on another surface, f, that meets a face kept, g,
tangentially along the edge e — a fillet or a smooth blend along it —
if there is one: (f, g, e). Asked of spec before the surfaces change.
A face kept that runs smoothly into one that moves would have to move
with it, which rebuilt does not do: they would no longer meet along
the edge, or cross where they should touch.