IfcGeometricSet
Definition from ISO/CD 1030342:1992: This entity is intended for
the transfer of models when a topological structure is not available.
Definition from buildingSMART: The IfcGeometricSet is used for the
exchange of shape representations consisting of (2D or 3D) points, curves,
and/or surfaces, which do not have a topological structure (such as connected
face sets or shells) and are not solid models (such as swept solids, CSG or
Brep)
NOTE: Corresponding STEP
entity: geometric_set. The derived attribute Dim has been added at this
level and was therefore demoted from the geometric_representation_item. Please
refer to ISO/IS 1030342:1994, p. 190 for the final definition of the formal
standard.
HISTORY: New entity in IFC
Release 2x.
EXPRESS specification:



WR21

:

SIZEOF(QUERY(Temp <* Elements 
Temp.Dim <> Elements[1].Dim))
= 0;




Attribute definitions:
Elements

:

The geometric elements which make up the geometric set, these may be points, curves or surfaces; but
are required to be of the same coordinate space dimensionality.

Dim

:

The space dimensionality of this class, it is identical to the first element in the set. A where rule
ensures that all elements have the same dimensionality.

Formal Propositions:
WR21

:

All elements within a geometric set shall have the same dimensionality.

Inheritance graph