#### 8.7.3.18 IfcSweptSurface

| Surface produite par extrusion d'une courbe le long d'une courbe
| Oberfläche - Entlang einem Pfad extrudiert

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 Position 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.

XSD Specification:

<xs:element name="IfcSweptSurface" type="ifc:IfcSweptSurface" abstract="true" substitutionGroup="ifc:IfcSurface" nillable="true"/>
<xs:complexType name="IfcSweptSurface" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcSurface">
<xs:sequence>
<xs:element name="SweptCurve" type="ifc:IfcProfileDef" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcSweptSurface

| SUBTYPE OF (IfcSurface);

SweptCurve | : | IfcProfileDef;
Position | : | OPTIONAL IfcStrippedOptional;

| WHERE

SweptCurveType | : | SweptCurve.ProfileType = IfcProfileTypeEnum.Curve;

END_ENTITY;

Attribute Definitions:

SweptCurve | : | The curve to be swept in defining the surface. The curve is defined as a profile within the position coordinate system.
Position | : | 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.

Inheritance Graph:

ENTITY IfcSweptSurface

| ENTITY IfcRepresentationItem

| INVERSE

LayerAssignment | : | SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems;
StyledByItem | : | SET [0:1] OF IfcStyledItem FOR Item;

| ENTITY IfcGeometricRepresentationItem

| ENTITY IfcSurface

| DERIVE

Dim | : | IfcDimensionCount := 3;

| ENTITY IfcSweptSurface

SweptCurve | : | IfcProfileDef;
Position | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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