Defined in File Ifc4x3_rc1.h
IfcFaceBasedSurfaceModel: public Ifc4x3_rc1::IfcGeometricRepresentationItem¶
Definition from ISO/CD 10303-42:1992: A face based surface model is described by a set of connected face sets of dimensionality 2. The connected face sets shall not intersect except at edges and vertices, except that a face in one connected face set may overlap a face in another connected face set, provided the face boundaries are identical. There shall be at least one connected face set.
A connected face set may exist independently of a surface model.
NOTE Corresponding STEP entity: face_based_surface_model. Please refer to ISO/IS 10303-42:1994, p. 188 for the final definition of the formal standard.
HISTORY: New entity in IFC Release 2x.
The connected face sets shall not overlap or intersect except at common faces, edges or vertices. The fbsm faces have dimensionality 2.
The set of connected face sets comprising the face based surface model.