8.9.3.52 IfcPolynomialCurve

AbV ⓘ

8.9.3.52.1 Semantic definition

Polynomial Curve.

8.9.3.52.2 Entity inheritance

8.9.3.52.3 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.
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
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 8.9.3.52.A

8.9.3.52.4 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 8.9.3.52.B

8.9.3.52.5 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;

8.9.3.52 IfcPolynomialCurve

8.9.3.52.1 Semantic definition

8.9.3.52.2 Entity inheritance

8.9.3.52.3 Attributes

8.9.3.52.4 Formal propositions

8.9.3.52.5 Formal representation

8.9.3.52.6 References

8.9.3.52.7 Changelog

8.9.3.52.7.1 IFC4.3_DEV_738df036

	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;