ISO 10303-214:2010(E)
This unit of functionality provides the capability to represent geometry as B-rep model with a consistent topological structure and explicitly defined geometry for faces and edges.
The B-rep model is represented by one or more B-rep solids. Each B-rep solid consists of a single closed shell, which represents its exterior, and an arbitrary number of closed shells corresponding to internal voids. Each shell consists of a collection of faces. Each face is defined by a surface and by loops of edges bounding the surface. The edges meet at vertices and have their geometry defined by curves. The geometry of the curves and surfaces can be complex but is required to be directly defined.
The definitions of geometric objects in this UoF as well as the definitions of the topological objects vertex, edge, path, loop, and face are identical to those in the UoF G3.
NOTE Any B-rep model, defined in UoF G5, could be represented in UoF G3 as a collection of faces with no loss of geometric precision but losing the information of a solid model, e.g., inner and outer domain of the B-rep solid.
The following application objects are used by the b_rep_model UoF:
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