#### 8.6.3.17 IfcSweptAreaSolid

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An IfcSweptAreaSolid represents the 3D shape by a sweeping representation scheme allowing a two dimensional planar cross section to sweep through space.

The swept area is defined by a cross section, represented by a subtype if IfcProfileDef, that is provided as a closed two-dimensional boundary on an implicit plane. The swept area is defined in the xy plane of the object coordinate system. The sweeping operation is applied to the swept area as defined within the subtypes of IfcSweptAreaSolid, some subtypes require an implicit transformation of the swept area to the start position of the sweep.

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

> NOTE Definition according to ISO/CD 10303-42:1992
> The swept area solid entity collects the entities which are defined procedurally by sweeping action on planar bounded surfaces. The position is space of the swept solid will be dependent upon the position of the swept area. The swept area will be a face of the resulting swept area solid, except for the case of a revolved area solid with angle equal to 2π (or 360 degrees).

> NOTE Entity adapted from swept_area_solid defined in ISO 10303-42.

> HISTORY New entity in IFC1.5

> IFC4 CHANGE The attribute Position has been changed to OPTIONAL with upward compatibility for file-based exchange.

XSD Specification:

<xs:element name="IfcSweptAreaSolid" type="ifc:IfcSweptAreaSolid" abstract="true" substitutionGroup="ifc:IfcSolidModel" nillable="true"/>
<xs:complexType name="IfcSweptAreaSolid" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:IfcSolidModel">
<xs:sequence>
<xs:element name="SweptArea" type="ifc:IfcProfileDef" nillable="true"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcSweptAreaSolid

| ABSTRACT SUPERTYPE OF(ONEOF(IfcExtrudedAreaSolid, IfcRevolvedAreaSolid))

| SUBTYPE OF (IfcSolidModel);

SweptArea | : | IfcProfileDef;
Position | : | OPTIONAL IfcStrippedOptional;

| WHERE

SweptAreaType | : | SweptArea.ProfileType = IfcProfileTypeEnum.Area;

END_ENTITY;

Attribute Definitions:

SweptArea | : | The surface defining the area to be swept. It is given as a profile definition within the xy plane of the position coordinate system.
Position | : | Position coordinate system for the resulting swept solid of the sweeping operation. The position coordinate system allows for re-positioning of the swept solid. If not provided, the swept solid remains within the position as determined by the cross section or by the directrix used for the sweeping operation. IFC4 CHANGE The attribute has been changed to OPTIONAL with upward compatibility for file-based exchange.

Formal Propositions:

SweptAreaType | : | The profile definition for the swept area solid shall be of type AREA.

Inheritance Graph:

ENTITY IfcSweptAreaSolid

| ENTITY IfcRepresentationItem

| INVERSE

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

| ENTITY IfcGeometricRepresentationItem

| ENTITY IfcSolidModel

| DERIVE

Dim | : | IfcDimensionCount := 3;

| ENTITY IfcSweptAreaSolid

SweptArea | : | IfcProfileDef;
Position | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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