The base shape the feature is built on.
The wire outlining the rib or groove in the plane of frame; the feature lies on its left as
it runs, seen from the side the normal points to.
The plane the wire lies in, through the frame's origin and square to its normal; the frame's direction does not matter.
OptionalthicknessHow thick the feature is on the side of the plane the frame's normal points to, in model units.
OptionalotherHow thick the feature is on the other side of the plane, in model units; it and thickness
are not both 0.
A base shape, a wire and the plane it lies in for
features.rib, which fills the region the wire closes off against the base, andfeatures.groove, which cuts a region away.