Function out_and_back 

pub fn out_and_back(
    model: &Model,
    shape: &Shape,
    tol: Tolerances,
) -> OgeomResult<Vec<OutAndBack>>

Every pair of consecutive edges of a face of shape that runs out and back along one path, tails of two distinct edges and notches alike, face by face in the shape’s order and wire by wire; a slit, one edge walked out and back, is not one. See the module documentation.

Errors

OgeomError::Dangling if a handle fails to resolve; an evaluation error where a curve cannot be evaluated over its range.