The IfcThirdOrderPolynomialSpiral is a specialization of IfcSpiral. The curvature κ and radius of the curvature ρ, at any point of the curve, are related to the arc length s by the third order formulae:
Interpretation of the parameters:
and the third order polynomial spiral is parameterized as:
and the parametric range is: -∞ < u < ∞.
|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.
No description available.
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The constant that defines the cubic term in the equation which defines the relation between curvature and arc length for the curve.
The constant that defines the quadratic term in the equation which defines the relation between curvature and arc length for the curve.
The constant that defines the linear term in the equation which defines the relation between curvature and arc length for the curve.
The constant that defines the constant term in the equation which defines the relation between curvature and arc length for the curve.
ENTITY IfcThirdOrderPolynomialSpiral SUBTYPE OF (IfcSpiral); CubicTerm : IfcLengthMeasure; QuadraticTerm : OPTIONAL IfcLengthMeasure; LinearTerm : OPTIONAL IfcLengthMeasure; ConstantTerm : OPTIONAL IfcLengthMeasure; END_ENTITY;