8.8.3.21 IfcGeometricCurveSet
8.8.3.21.1 Semantic definition
The IfcGeometricCurveSet is used for the exchange of shape representation consisting of an collection of (2D or 3D) points and curves only.
Definition according to ISO/CD 10303-42:1992 A geometric curve set is a collection of two or three dimensional points and curves. Entity adapted from geometric_curve_set defined in ISO 10303-42. New entity in IFC2x2.8.8.3.21.2 Entity inheritance
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- IfcGeometricSet
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.8.3.21.3 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. The inverse attribute LayerAssignments has been added. 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. The inverse attribute StyledByItem has been added. |
|
| Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes | |||
| IfcGeometricSet (2) | |||
| 1 | Elements | SET [1:?] OF IfcGeometricSetSelect |
The geometric elements which make up the geometric set, these may be points, curves or surfaces; but are required to be of the same coordinate space dimensionality. |
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this class, it is identical to the first element in the set. A where rule ensures that all elements have the same dimensionality. |
8.8.3.21.4 Formal propositions
| Name | Description |
|---|---|
| NoSurfaces |
No surface shall be included in this geometric set. |
|
|
8.8.3.21.5 Examples
8.8.3.21.6 Formal representation
ENTITY IfcGeometricCurveSet
SUBTYPE OF (IfcGeometricSet);
WHERE
NoSurfaces : SIZEOF(QUERY(Temp <* SELF\IfcGeometricSet.Elements |
'IFC4X3_DEV_bc7847cd.IFCSURFACE' IN TYPEOF(Temp))) = 0;
END_ENTITY;