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