Defined in File Ifc4x1.h
IfcRationalBSplineSurfaceWithKnots: public Ifc4x1::IfcBSplineSurfaceWithKnots¶
A rational B-spline surface with knots is a piecewise parametric rational surface described in terms of control points, and associated weight values.
The surface is to be interpreted as follows:
NOTE: The IfcRationalBSplineSurfaceWithKnots 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 IfcRationalBSplineSurfaceWithKnots has been introduced to avoid the complexity of ANDOR subtype relationships in the ISO 10303-42 specification
NOTE: Corresponding ISO 10303 entity: rational_b_spline_surface. Please refer to ISO/IS 10303-42:1994, p. 85 for the final definition of the formal standard.
HISTORY: New entity in IFC2x4.
The weights associated with the control points in the rational case.
IfcRationalBSplineSurfaceWithKnots(int v1_UDegree, int v2_VDegree, IfcTemplatedEntityListList<::Ifc4x1::IfcCartesianPoint>::ptr v3_ControlPointsList, ::Ifc4x1::IfcBSplineSurfaceForm::Value v4_SurfaceForm, bool v5_UClosed, bool v6_VClosed, bool v7_SelfIntersect, std::vector<int> v8_UMultiplicities, std::vector<int> v9_VMultiplicities, std::vector<double> v10_UKnots, std::vector<double> v11_VKnots, ::Ifc4x1::IfcKnotType::Value v12_KnotSpec, std::vector<std::vector<double>> v13_WeightsData)¶