IFC 4.3.1.0 (IFC4X3_ADD1) development

8.9.3.57 IfcReparametrisedCompositeCurveSegment

8.9.3.57.1 Semantic definition

The IfcReparametrisedCompositeCurveSegment is geometrically identical to a IfcCompositeCurveSegment but with the additional capability of reparametrization.

If t~0~ ≤ t ≤ t~1~ is the parameter range of ParentCurve, the new parameter . for the reparametrised composite curve segment is given by the equation:

Image if SameSense = TRUE; or by the equation:
Figure 8.9.3.57.A
Image if SameSense = FALSE;
Figure 8.9.3.57.B

8.9.3.57.2 Entity inheritance

8.9.3.57.3 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.
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).
IfcCompositeCurveSegment (2)
2 SameSense IfcBoolean

An indicator of whether or not the sense of the segment agrees with, or opposes, that of the parent curve. If SameSense is false, the point with highest parameter value is taken as the first point of the segment.
3 ParentCurve IfcCurve

The bounded curve which defines the geometry of the segment.
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IfcReparametrisedCompositeCurveSegment (1)
4 ParamLength IfcParameterValue

No description available.

Table 8.9.3.57.C

8.9.3.57.4 Formal propositions

Name Description
PositiveLengthParameter

The ParamLength shall be greater than zero.

 
ParamLength > 0.0
Table 8.9.3.57.D

8.9.3.57.5 Formal representation 

ENTITY IfcReparametrisedCompositeCurveSegment
 SUBTYPE OF (IfcCompositeCurveSegment);
	ParamLength : IfcParameterValue;
 WHERE
	PositiveLengthParameter : ParamLength > 0.0;
END_ENTITY;

8.9.3.57.6 References

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8.9.3.57.7 Changelog

8.9.3.57.7.1 IFC4

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