Context
The boundary of a face can consist of several boundary curves. If a boundary curve is
smaller than a specified value, the element can become invalid or degenerate. It can also
cause the loss of a face or of a topology.
A boundary curve can consist of several fragments, created unintentionally during the
filleting of the geometry, for example. Fragments are neglected if they are smaller than the
system tolerance. If not, they can also become invalid or degenerate and cause the loss of a
face or topology.