IFC 4.3.0.1 (IFC4X3_TC1)

8.8.3.13 IfcDirectrixDerivedReferenceSweptAreaSolid

8.8.3.13.1 Semantic definition

In most cases the case the IfcDirectrixDerivedReferenceSweptAreaSolid has exactly the same behavior as IfcFixedReferenceSweptAreaSolid, except when the Directrix not only defines a tangent direction but a tangent plane for each point on the curve. Like for example in the case of a IfcSegmentReferenceCurve, the change in y directioin of the tangent plane is added to the fixed reference. The change in y direction at the start of the directrix is defined to be 0 independent from StartParam value, this means the change can be non-zero at the start of the resulting Swept Area Solid.

8.8.3.13.2 Entity inheritance

8.8.3.13.3 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.

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.

IfcSolidModel (1)
* Dim IfcDimensionCount

This attribute is formally derived.

3

The space dimensionality of this class, it is always 3.

IfcSweptAreaSolid (2)
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.

IfcDirectrixCurveSweptAreaSolid (3)
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.

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IfcFixedReferenceSweptAreaSolid (1)
6 FixedReference IfcDirection

No description available.

Table 8.8.3.13.A

8.8.3.13.4 Formal representation

ENTITY IfcDirectrixDerivedReferenceSweptAreaSolid
 SUBTYPE OF (IfcFixedReferenceSweptAreaSolid);
END_ENTITY;

8.8.3.13.5 References

8.8.3.13.6 Changelog

8.8.3.13.6.1 IFC4.3_TC1

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