Defined in File Ifc4x1.h
IfcOrientedEdge: public Ifc4x1::IfcEdge¶
Definition from ISO/CD 10303-42:1992: An oriented edge is an edge constructed from another edge and contains a BOOLEAN direction flag to indicate whether or not the orientation of the constructed edge agrees with the orientation of the original edge. Except for perhaps orientation, the oriented edge is equivalent to the original edge.
NOTE A common practice is solid modelling systems is to have an entity that represents the “use” or “traversal” of an edge. This “use” entity explicitly represents the requirement in a manifold solid that each edge must be traversed exactly twice, once in each direction. The “use” functionality is provided by the edge subtype oriented edge.
NOTE Corresponding ISO 10303 entity: oriented_edge. Please refer to ISO/IS 10303-42:1994, p. 133 for the final definition of the formal standard.
HISTORY New Entity in IFC Release 2.0.
BOOLEAN, If TRUE the topological orientation as used coincides with the orientation from start vertex to end vertex of the edge element. If FALSE otherwise.