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IfcElementarySurface

Definition from ISO/CD 10303-42:1992: An elementary surface (IfcElementarySurface) is a simple analytic surface with defined parametric representation.

NOTE Corresponding STEP entity: elementary_surface. Only the subtype plane is incorporated as IfcPlane. The derived attribute Dim has been added (see also note at IfcGeometricRepresentationItem). Please refer to ISO/IS 10303-42:1994, p. 69 for the final definition of the formal standard.

HISTORY New class in IFC Release 1.5


EXPRESS specification:

ENTITY IfcElementarySurface
ABSTRACT SUPERTYPE OF (IfcPlane)
SUBTYPE OF ( IfcSurface);
Position  :  IfcAxis2Placement3D;
DERIVE
Dim  :  IfcDimensionCount :=  Position.Dim;
END_ENTITY;

Attribute definitions:

Position  :  The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface.
Dim  :  The space dimensionality of this class, derived from the dimensionality of the Position.

References (2):

Name Type Referred through Express-G
IfcPlane Entity
Supertype
Diagram 7
IfcSurface Entity
Subtype
Diagram 7

Inheritance graph

ENTITY IfcElementarySurface;
ENTITY IfcRepresentationItem;
ENTITY IfcGeometricRepresentationItem;
ENTITY IfcSurface;
ENTITY IfcElementarySurface;
Position  :  IfcAxis2Placement3D;
DERIVE
Dim  :  IfcDimensionCount :=  Position.Dim;
END_ENTITY;