8.8.3.14 IfcDirectrixDerivedReferenceSweptAreaSolid
8.8.3.14.1 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 direction 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.
8.8.3.14.2 Entity inheritance
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- IfcSolidModel
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.8.3.14.3 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. 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. |
| Click to show 8 hidden inherited attributes Click to hide 8 inherited attributes | |||
| IfcFixedReferenceSweptAreaSolid (1) | |||
| 6 | FixedReference | IfcDirection |
No description available. |
8.8.3.14.4 Formal representation
ENTITY IfcDirectrixDerivedReferenceSweptAreaSolid
SUBTYPE OF (IfcFixedReferenceSweptAreaSolid);
END_ENTITY;