In addition, a few approaches have been developed dealing with
the reconstruction problem based either on a set of 3D features
which can be possibly found in a technical drawing (e.g.
revolutions and extrusions) or on information coming from
additional views, like cross-sections. The works which confront
the reconstruction problem for curvilinear objects, however,
usually present quite ‘‘tricky’’ approaches, generally involving a
considerable amount of user interaction [8,9].