Function triangulate_face_kept 

pub fn triangulate_face_kept(
    model: &Model,
    face: &Shape,
    deflection: Deflection,
    kept: &FaceMeshCache,
    tol: Tolerances,
) -> OgeomResult<Triangulation>

As triangulate_face, taking the face from kept where it drew this face at this deflection before, and keeping what it draws there.

Errors

As triangulate_face.