An IfcElementarySurface in the common supertype of analytical surfaces.
NOTE Definition according to ISO/CD 10303-42:1992
An elementary surface (IfcElementarySurface) is a simple analytic surface with defined parametric representation.
NOTE Entity adapted from elementary_surface defined in ISO 10303-42.
HISTORY New entity in IFC1.5
|LayerAssignment||SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems||Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.|
> IFC2x3 CHANGE The inverse attribute LayerAssignments has been added.
> IFC4 CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
|StyledByItem||SET [0:1] OF IfcStyledItem FOR Item||Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.|
> IFC2x3 CHANGE The inverse attribute StyledByItem has been added.
|Dim||INVALID||The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.|
> IFC4 CHANGE Derived attribute promoted from subtypes.
|1||Position||IfcAxis2Placement3D||The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface.|
ENTITY IfcElementarySurface ABSTRACT SUPERTYPE OF (ONEOF (IfcCylindricalSurface ,IfcPlane ,IfcSphericalSurface ,IfcToroidalSurface)) SUBTYPE OF (IfcSurface); Position : IfcAxis2Placement3D; END_ENTITY;