Defined in File Ifc4.h
IfcAdvancedBrepWithVoids: public Ifc4::IfcAdvancedBrep¶
The IfcAdvancedBrepWithVoids is a specialization of an advanced B-rep which contains one or more voids in its interior. The voids are represented as closed shells which are defined so that the shell normal point into the void.
NOTE Corresponding ISO 10303-42 entity: brep_with_voids (see note above). Please refer to ISO/IS 10303-42:1994, p. 173 for the final definition of the formal standard. In IFC advanced B-rep with voids is represented by this subtype IfcAdvancedBrepWithVoids and not defined via an implicit ANDOR supertype constraint as in ISO/IS 10303-42:1994 between an instance of manifold_solid_brep AND brep_with_voids. This change has been made due to the fact, that only ONEOF supertype constraint is allowed within the IFC object model.
HISTORY New entity in IFC2x4
Each void shell shall be disjoint from the outer shell and from every other void shell Each void shell shall be enclosed within the outer shell but not within any other void shell. In particular the outer shell is not in the set of void shells Each shell in the IfcManifoldSolidBrep shall be referenced only once. All the faces of all the shells in the IfcAdvancedBrep and the IfcAdvancedBrepWithVoids.Voids shall be of type IfcAdvancedFace.