ISO 10303-214:2010(E)
This unit of functionality provides the capability to represent geometry as a B-rep model with planar faces and implicit topology.
The faceted B-rep model is represented by an outer shell and an arbitrary number of internal voids, each represented by a closed shell. A requirement, included to provide internal consistency checks, is that each face shall be associated with a plane surface. All the face boundaries are implicitly defined by poly loops. One of these poly loops is defined as the outer boundary. The edges are all straight lines but are not explicitly defined. The edge information can be deduced from the poly loop definitions.
This UoF shares the basic geometric definitions of point, line, and plane with the UoFs G3 and G5. It also shares the definition of a manifold solid B-rep and the topological concepts of closed shell and face with the UoF G5.
NOTE A faceted B-rep model, as defined in this UoF, would not be considered to be a valid example of a B-rep model in the UoF G5; it could however be converted to such a model by explicitly creating lines, edges and vertices and converting the face bounding poly loops in UoF G4 to edge loops as required by the UoF G5.
The following application objects are used by the faceted_b_rep_model UoF:
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