IFC 4.3.x development

8.9.3.31 IfcDirectrixCurveSweptAreaSolid

Change log

IFC4X3_RC3

added

8.9.3.31.1 Semantic definitions at the entity

An abstract entity defining common information about a type of swept area solid which is the result of sweeping an area along a Directrix. The swept area is provided by a subtype of IfcProfileDef. The profile is placed by an implicit cartesian transformation operator at the start point of the sweep, where the profile normal agrees to the tangent of the directrix at this point. The direction of profile�s x-axis is specialized by the subtypes of IfcDirextrixCurveSweptAreaSolid. The start of the sweeping operation is at the StartParam, the parameter value is provided based on the curve parameterization. If no StartParam is provided the start defaults to the begin of the directrix. The end of the sweeping operation is at the EndParam, the parameter value is provided based on the curve parameterization. If no EndParam is provided the end defaults to the end of the directrix.

8.9.3.31.1 Attributes

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment 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.
IfcGeometricRepresentationItem
IfcSolidModel
Dim INVALID The space dimensionality of this class, it is always 3.
IfcSweptAreaSolid
1 SweptArea IfcProfileDef The surface defining the area to be swept. It is given as a profile definition within the xy plane of the position coordinate system.
2 Position OPTIONAL IfcAxis2Placement3D 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.
IfcDirectrixCurveSweptAreaSolid
3 Directrix IfcCurve The curve used to define the sweeping operation. The solid is generated by sweeping the SELF\IfcSweptAreaSolid.SweptArea along the Directrix.
4 StartParam OPTIONAL IfcCurveMeasureSelect The parameter value on the Directrix at which the sweeping operation commences. If no value is provided the start of the sweeping operation is at the start of the Directrix.
5 EndParam OPTIONAL IfcCurveMeasureSelect The parameter value on the Directrix at which the sweeping operation ends. If no value is provided the end of the sweeping operation is at the end of the Directrix.

8.9.3.31.2 Entity inheritance

dot_inheritance IfcFixedReferenceSweptAreaSolid IfcFixedReferenceSweptAreaSolid IfcDirectrixCurveSweptAreaSolid IfcDirectrixCurveSweptAreaSolid IfcFixedReferenceSweptAreaSolid->IfcDirectrixCurveSweptAreaSolid IfcSweptAreaSolid IfcSweptAreaSolid IfcDirectrixCurveSweptAreaSolid->IfcSweptAreaSolid IfcSurfaceCurveSweptAreaSolid IfcSurfaceCurveSweptAreaSolid IfcSurfaceCurveSweptAreaSolid->IfcDirectrixCurveSweptAreaSolid IfcExtrudedAreaSolid IfcExtrudedAreaSolid IfcExtrudedAreaSolid->IfcSweptAreaSolid IfcSolidModel IfcSolidModel IfcSweptAreaSolid->IfcSolidModel IfcRevolvedAreaSolid IfcRevolvedAreaSolid IfcRevolvedAreaSolid->IfcSweptAreaSolid IfcSolidModel_children 4 more... IfcSolidModel_children->IfcSolidModel IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcSolidModel->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.9.3.31.3 Formal representations

ENTITY IfcDirectrixCurveSweptAreaSolid
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcFixedReferenceSweptAreaSolid
	,IfcSurfaceCurveSweptAreaSolid))
 SUBTYPE OF (IfcSweptAreaSolid);
	Directrix : IfcCurve;
	StartParam : OPTIONAL IfcCurveMeasureSelect;
	EndParam : OPTIONAL IfcCurveMeasureSelect;
 WHERE
	DirectrixBounded : (EXISTS(StartParam) AND EXISTS(EndParam)) OR 
(SIZEOF(['IFC4X3_DEV_a1492713.IFCCONIC', 'IFC4X3_DEV_a1492713.IFCBOUNDEDCURVE'] * TYPEOF(Directrix)) = 1);
END_ENTITY;