8.9.3.71 IfcSweptSurface

ABSTRACT This definition may not be instantiated

8.9.3.71.1 Semantic definition

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 swept curve is defined by positioning the profile in the xy plane of the object coordinate system,
The sweeping operation is applied to the swept curve as defined within the subtypes of IfcSweptSurface;

The optional _Positio_n coordinate system allows for re-positioning the resulting swept surface relative to the object coordinate system.

8.9.3.71.2 Entity inheritance

8.9.3.71.3 Attributes

#	Attribute	Type	Description
IfcRepresentationItem (2)
	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.
IfcSurface (1)
*	Dim	IfcDimensionCount	This attribute is formally derived. `3` The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item. IFC4-CHANGE Derived attribute promoted from subtypes.
Click to show 3 hidden inherited attributes
IfcSweptSurface (2)
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.

Table 8.9.3.71.A

8.9.3.71.4 Formal propositions

Name	Description
SweptCurveType	No description available.
`SweptCurve.ProfileType = IfcProfileTypeEnum.Curve`

Table 8.9.3.71.B

8.9.3.71.5 Formal representation

 ENTITY IfcSweptSurface
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcSurfaceOfLinearExtrusion
	,IfcSurfaceOfRevolution))
 SUBTYPE OF (IfcSurface);
	SweptCurve : IfcProfileDef;
	Position : OPTIONAL IfcAxis2Placement3D;
 WHERE
	SweptCurveType : SweptCurve.ProfileType = IfcProfileTypeEnum.Curve;
END_ENTITY;