IFC 4.3.0.1 (IFC4X3_TC1)

8.9.3.62 IfcSegment

ABSTRACT This definition may not be instantiated

8.9.3.62.1 Semantic definition

Definition of a curve segment with a trimming mechanism built in with a StartPlacement (first point) and SegmentLength (second point).

8.9.3.62.2 Entity inheritance

8.9.3.62.3 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.

Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes
IfcSegment (3)
1 Transition IfcTransitionCode

Connectivity between the continuous segments is not enforced per se to be tangential. Setting "TangentialContinuity" to True means that the current segment shall continue with tangential continuity to the previous one.

UsingCurves SET [1:?] OF IfcCompositeCurve FOR Segments

The set of composite curves which use this composite curve segment as a segment. This set shall not be empty.

* Dim IfcDimensionCount

This attribute is formally derived.

IfcSegmentDim(SELF)

The space dimensionality of this abstract class, handled by a function specific for concrete subtypes which returns the dimensionality of the ParentCurve attribute (defined on both subtypes).

Table 8.9.3.62.A

8.9.3.62.4 Formal representation

ENTITY IfcSegment
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcCompositeCurveSegment
	,IfcCurveSegment))
 SUBTYPE OF (IfcGeometricRepresentationItem);
	Transition : IfcTransitionCode;
 DERIVE
	Dim : IfcDimensionCount := IfcSegmentDim(SELF);
 INVERSE
	UsingCurves : SET [1:?] OF IfcCompositeCurve FOR Segments;
END_ENTITY;

8.9.3.62.5 References

8.9.3.62.6 Changelog

8.9.3.62.6.1 IFC4.3_TC1

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