|modifications||attributes Position is_optional||Changed from False to True|
An IfcSweptSurface is a surface defined by sweeping a curve. The swept surface is defined by a open or closed curve, represented by a subtype if IfcProfileDef, that is provided as a two-dimensional curve on an implicit plane, and by the sweeping operation.
The optional _Positio_n coordinate system allows for re-positioning the resulting swept surface relative to the object coordinate system.
NOTE Definition according to ISO/CD 10303-42:1992
A swept surface is one that is constructed by sweeping a curve along another curve.
NOTE Entity adapted from swept_surface defined in ISO 10303-42.
HISTORY New entity in IFC2x.
IFC4 CHANGE The attribute Position has been changed to OPTIONAL with upward compatibility for file-based exchange.
|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||SweptCurve||IfcProfileDef||The curve to be swept in defining the surface. The curve is defined as a profile within the position coordinate system.|
|2||Position||OPTIONAL IfcAxis2Placement3D||Position coordinate system for the swept surface, provided by a profile definition within the XY plane of the Position coordinates. If not provided, the position of the profile being swept is determined by the object coordinate system. In this case, the swept surface is not repositioned.|
> IFC4 CHANGE The attribute has been changed to OPTIONAL with upward compatibility for file-based exchange.
ENTITY IfcSweptSurface ABSTRACT SUPERTYPE OF (ONEOF (IfcSurfaceOfLinearExtrusion ,IfcSurfaceOfRevolution)) SUBTYPE OF (IfcSurface); SweptCurve : IfcProfileDef; Position : OPTIONAL IfcAxis2Placement3D; WHERE SweptCurveType : SweptCurve.ProfileType = IfcProfileTypeEnum.Curve; END_ENTITY;