Defined in File Ifc4x2.h
IfcRationalBSplineCurveWithKnots: public Ifc4x2::IfcBSplineCurveWithKnots¶
A rational B-spline curve with knots is a B-spline curve described in terms of control points and basic functions. It describes weights in addition to the control points defined at the supertype IfcBSplineCurve.
NOTE: The IfcRationalBSplineCurveWithKnots is an entity that had been adopted from ISO 10303, Industrial automation systems and integration — Product data representation and exchange, Part 42: Integrated generic resource: Geometric and topological representation.
NOTE: The specific subtype IfcRationalBSplineCurveWithKnots has been introduced to avoid the complexity of ANDOR subtype relationships in the ISO 10303-42 specification
All weights shall be positive and the curve is given by:
k+1 number of control points
Pi control points
NOTE Corresponding ISO 10303 entity: rational_b_spline_curve. Please refer to ISO/IS 10303-42:1994, p. 45 for the final definition of the formal standard.
HISTORY New entity in IFC2x4.
The supplied values of the weights.
IfcRationalBSplineCurveWithKnots(int v1_Degree, IfcTemplatedEntityList<::Ifc4x2::IfcCartesianPoint>::ptr v2_ControlPointsList, ::Ifc4x2::IfcBSplineCurveForm::Value v3_CurveForm, bool v4_ClosedCurve, bool v5_SelfIntersect, std::vector<int> v6_KnotMultiplicities, std::vector<double> v7_Knots, ::Ifc4x2::IfcKnotType::Value v8_KnotSpec, std::vector<double> v9_WeightsData)¶