Geometry Terms
Following are definitions for some geometric terms:
• Surface—An ideal geometric representation, that is, an infinite plane.
• Face—A trimmed surface. A face has one or more contours.
• Contour—A closed loop on a face. A contour consists of multiple edges. A contour can belong to one face only.
• Edge—The boundary of a trimmed surface.
An edge of a solid is the intersection of two surfaces. The edge belongs to those two surfaces and to two contours. An edge of a datum surface can be either the intersection of two datum surfaces or the external boundary of the surface.
If the edge is the intersection of two datum surfaces it will belong to those two surfaces and to two contours. If the edge is the external boundary of the datum surface it will belong to that surface alone and to a single contour.