Terminology
Midsurface - is the sheet body which is created halfway between two defining faces. The points and normals of the parent faces are averaged at corresponding parameters. The properties of a midsurface are exactly the same as any other sheet body. The only difference is that a midsurface is associated with its parent face pairs.
Midsurface Feature - refers to a feature that provides you with the ability to create and manipulate a list of midsurfaces and their defining face pairs.
Face Pair Feature - refers to the fundamental building block of a midsurface feature. It contains two lists of opposing faces and the resulting midsurface.
Defining Face - is the face of a solid body used to create a midsurface.
Side Faces - refer to faces in one of two sets of opposing face pairs.
Seed Face - is a face on the solid. For sheet metal parts, any face on either side of the solid can be selected as the seed face.
Boundary Face - is defined automatically. The system calculates whether a given face has an edge which is connected to a face and the normals on the two faces are about 90 degrees apart. This connected face is defined as a boundary face when the face contains the edges in the thickness direction.
Cliff Angle - is measured as the angle between the normals of the two adjacent faces at a point on the common edge.
