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.

Inheritance graph

ENTITY IfcElementarySurface;

ENTITY IfcRepresentationItem;

INVERSE

LayerAssignments

SET OF IfcPresentationLayerAssignment FOR AssignedItems;

StyledByItem

SET [0:1] OF IfcStyledItem FOR Item;

ENTITY IfcGeometricRepresentationItem;