IFC 4.3.0.1 (IFC4X3) development

8.9.3.53 IfcPolynomialCurve

8.9.3.53.1 Semantic definition

Polynomial Curve.

8.9.3.53.2 Entity inheritance

8.9.3.53.3 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.

IfcCurve (1)
* Dim IfcDimensionCount

This attribute is formally derived.

IfcCurveDim(SELF)

The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.

Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes
IfcPolynomialCurve (4)
1 Position IfcPlacement

No description available.

2 CoefficientsX OPTIONAL LIST [2:?] OF IfcReal

No description available.

3 CoefficientsY OPTIONAL LIST [2:?] OF IfcReal

No description available.

4 CoefficientsZ OPTIONAL LIST [2:?] OF IfcReal

No description available.

Table 8.9.3.53.A

8.9.3.53.4 Formal propositions

Name Description
CorrectPositionDim

No description available.

((Position.Dim=2) AND (NOT EXISTS(CoefficientsZ))) OR (Position.Dim=3)
ValidCoefficients

No description available.

(EXISTS(CoefficientsX) AND EXISTS(CoefficientsY)) OR (EXISTS(CoefficientsX) AND EXISTS(CoefficientsZ)) OR (EXISTS(CoefficientsY) AND EXISTS(CoefficientsZ)) OR (EXISTS(CoefficientsX) AND EXISTS(CoefficientsY) AND EXISTS(CoefficientsZ))
Table 8.9.3.53.B

8.9.3.53.5 Formal representation

ENTITY IfcPolynomialCurve
 SUBTYPE OF (IfcCurve);
	Position : IfcPlacement;
	CoefficientsX : OPTIONAL LIST [2:?] OF IfcReal;
	CoefficientsY : OPTIONAL LIST [2:?] OF IfcReal;
	CoefficientsZ : OPTIONAL LIST [2:?] OF IfcReal;
 WHERE
	CorrectPositionDim : ((Position.Dim=2) AND (NOT EXISTS(CoefficientsZ))) OR (Position.Dim=3);
	ValidCoefficients : (EXISTS(CoefficientsX) AND EXISTS(CoefficientsY)) OR (EXISTS(CoefficientsX) AND EXISTS(CoefficientsZ)) OR (EXISTS(CoefficientsY) AND EXISTS(CoefficientsZ)) OR (EXISTS(CoefficientsX) AND EXISTS(CoefficientsY) AND EXISTS(CoefficientsZ));
END_ENTITY;

8.9.3.53.6 References

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8.9.3.53.7 Changelog

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