Parallel rib vs. perpendicular and linear vs. natural

Additional, less known options are related to the direction of rib extrusion and its shape.

The first option concerns the selection between the direction parallel a perpendicular to the sketch plane. you can tell, that basically a parallel rib is not applicable, But sometimes it is more convenient to draw a sketch on an existing plane in symmetry and pull out parallel than to create an additional plane to pull out perpendicular..

The second option is, in turn, the choice between line and natural mode. This is a strange setting, ponieważ dotyczy kontynuacji łuku – może być domknięte stycznie linią – w trybie linear, or a bow in mode natural.

Why strange?

Because, that probably most users will draw contours like this, jak ma wyglądać żebro a nie będzie korzystać z wbudowanej opcji…