8.8.3.16 IfcFaceBasedSurfaceModel

8.8.3.16.1 Semantic definition

The IfcFaceBasedSurfaceModel represents the a shape by connected face sets. The connected faces have a dimensionality 2 and are placed in a coordinate space of dimensionality 3.

Informal Propositions:

1. The connected face sets shall not overlap or intersect except at common faces, edges or vertices.
2. The fbsm faces have dimensionality 2.

8.8.3.16.4 Formal representation

ENTITY IfcFaceBasedSurfaceModel
SUBTYPE OF (IfcGeometricRepresentationItem);
FbsmFaces : SET [1:?] OF IfcConnectedFaceSet;
DERIVE
Dim : IfcDimensionCount := 3;
END_ENTITY;