8.8.3.21 IfcGeometricCurveSet

RV ⓘ

AbV ⓘ

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.

8.8.3.21.2 Entity inheritance

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. 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.
Click to show 2 hidden 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. `Elements[1].Dim` 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.

Table 8.8.3.21.C

8.8.3.21.4 Formal propositions

Name Description

NoSurfaces

No surface shall be included in this geometric set.

 SIZEOF(QUERY(Temp <* SELF\IfcGeometricSet.Elements |
'IFC4X3_DEV_738df036.IFCSURFACE' IN TYPEOF(Temp))) = 0

Table 8.8.3.21.D

8.8.3.21.5 Examples

Figure 8.8.3.21.A

Grid Placement
Figure 8.8.3.21.B

Construction Scheduling Task

8.8.3.21.6 Formal representation

 ENTITY IfcGeometricCurveSet
 SUBTYPE OF (IfcGeometricSet);
 WHERE
	NoSurfaces : SIZEOF(QUERY(Temp <* SELF\IfcGeometricSet.Elements |
'IFC4X3_DEV_738df036.IFCSURFACE' IN TYPEOF(Temp))) = 0;
END_ENTITY;

8.8.3.21.7 References

IfcGeometricSet