ABSTRACT This definition may not be instantiated
Spirals are curves that revolve around a point while increasing its length. In general, these curves are parameterized in the following way: x = r(φ) cosφ y = r(φ) sinφ
In the case of the clothoid and higher order transition spirals, the parametrization is: x = ∫cos &Theta dl y = ∫sin &Theta dl
where &Theta is the deflection or bearing angle and dl the differential of the spiral length.
|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.
This attribute is formally derived.
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No description available.
ENTITY IfcSpiral ABSTRACT SUPERTYPE OF (ONEOF (IfcClothoid ,IfcCosineSpiral ,IfcSecondOrderPolynomialSpiral ,IfcSeventhOrderPolynomialSpiral ,IfcSineSpiral ,IfcThirdOrderPolynomialSpiral)) SUBTYPE OF (IfcCurve); Position : OPTIONAL IfcAxis2Placement; END_ENTITY;