IFC 4.3.0.1 (IFC4X3) development

8.9.2.3 IfcBSplineCurveForm

8.9.2.3.1 Semantic definition

The IfcBSplineCurveForm represents a part of a curve of some sppecific form.

8.9.2.3.2 Type values

Type Description
CIRCULAR_ARC

An arc of a circle, or a complete circle represented by a B-spline curve.

ELLIPTIC_ARC

An arc of an ellipse, or a complete ellipse, represented by a B-spline curve.

HYPERBOLIC_ARC

An arc of finite length of one branch of a hyperbola represented by a B-spline curve.

PARABOLIC_ARC

An arc of finite length of a parabola represented by a B-spline curve.

POLYLINE_FORM

A connected sequence of line segments represented by degree 1 B-spline basis functions.

UNSPECIFIED

A B-spline curve for which no particular form is specified.

Table 8.9.2.3.A

8.9.2.3.3 Formal representation

TYPE IfcBSplineCurveForm = ENUMERATION OF
	(CIRCULAR_ARC
	,ELLIPTIC_ARC
	,HYPERBOLIC_ARC
	,PARABOLIC_ARC
	,POLYLINE_FORM
	,UNSPECIFIED);
END_TYPE;

8.9.2.3.4 References

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