8.9.3.24 IfcCosineSpiral

AbV ⓘ

8.9.3.24.1 Semantic definition

A type of spiral curve for which the curvature change is dependent on the cosine function.

The curvature is defined as:

K = K0/2 (Constant - cos&pi s/CosineTerm)

#	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.
IfcSpiral (1)
1	Position	IfcAxis2Placement	No description available.
Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes
IfcCosineSpiral (2)
2	CosineTerm	IfcLengthMeasure	No description available.
3	ConstantTerm	OPTIONAL IfcLengthMeasure	No description available.

Table 8.9.3.24.A

ENTITY IfcCosineSpiral
 SUBTYPE OF (IfcSpiral);
	CosineTerm : IfcLengthMeasure;
	ConstantTerm : OPTIONAL IfcLengthMeasure;
END_ENTITY;