IfcSweptSurface

BACnet MVD

#### IfcSweptSurface

Natural language names

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

##### Semantic definitions at the entity

Entity 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 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.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | SweptCurve | IfcProfileDef |  | The curve to be swept in defining the surface. The curve is defined as a profile within the position coordinate system. | X | X

2

Position

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.

X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRepresentationItem

LayerAssignment

IfcPresentationLayerAssignment
@AssignedItems

S[0:1]

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.

X

StyledByItem

IfcStyledItem
@Item

S[0:1]

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.

X

X

IfcGeometricRepresentationItem
IfcSurface

Dim
:=3

IfcDimensionCount

The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.

> IFC4 CHANGE Derived attribute promoted from subtypes.

X

X

IfcSweptSurface
1 | SweptCurve | IfcProfileDef |  | The curve to be swept in defining the surface. The curve is defined as a profile within the position coordinate system. | X | X

2

Position

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.

X

##### Formal representations

XML 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:element name="Position" type="ifc:IfcAxis2Placement3D" nillable="true" minOccurs="0"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcSweptSurface
ABSTRACT SUPERTYPE OF(ONEOF(IfcSurfaceOfLinearExtrusion, IfcSurfaceOfRevolution))
SUBTYPE OF (IfcSurface);
SweptCurve : IfcProfileDef;
Position : OPTIONAL IfcAxis2Placement3D;
WHERE
SweptCurveType : SweptCurve.ProfileType = IfcProfileTypeEnum.Curve;
END_ENTITY;

EXPRESS-G diagram

`

Link to this page