IFC 4.3.0.1 (IFC4X3) development

8.9.3.65 IfcSineSpiral

8.9.3.65.1 Semantic definition

A type of spiral curve for which the curvature change is dependent on the sine function. It is also known as the Klein curve.

The curvature is defined as:

K = K0 (s LinearTerm - 1/2&pi sin2&pi/SineTerm)

8.9.3.65.2 Entity inheritance

8.9.3.65.3 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.

IfcSpiral (1)
1 Position OPTIONAL IfcAxis2Placement

No description available.

Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes
IfcSineSpiral (3)
2 SineTerm IfcLengthMeasure

No description available.

3 LinearTerm OPTIONAL IfcLengthMeasure

No description available.

4 ConstantTerm OPTIONAL IfcLengthMeasure

No description available.

Table 8.9.3.65.A

8.9.3.65.4 Formal representation

ENTITY IfcSineSpiral
 SUBTYPE OF (IfcSpiral);
	SineTerm : IfcLengthMeasure;
	LinearTerm : OPTIONAL IfcLengthMeasure;
	ConstantTerm : OPTIONAL IfcLengthMeasure;
END_ENTITY;

8.9.3.65.5 References

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8.9.3.65.6 Changelog

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