Defined in File Ifc4x3_rc1.h
public Ifc4x3_rc1::IfcRationalBSplineSurfaceWithKnots(Class Ifc4x3_rc1::IfcRationalBSplineSurfaceWithKnots)
IfcBSplineSurfaceWithKnots: public Ifc4x3_rc1::IfcBSplineSurface¶
Definition from ISO 10303:42:1994: This is a B-spline surface in which the knot values are explicitly given. This subtype shall be used to represent non-uniform B-spline surfaces, and may also be used for other knot types.
All knot multiplicities except the first and the last shall be in the range 1,….,d; the first and last may have a maximum value of d + 1. In evaluating the basis functions, a knot u of, e.g., multiplicity 3 is interpreted as a sequence u, u, u, in the knot array.
NOTE Corresponding ISO 10303 entity: b_spline_surface_with_knots. Please refer to ISO/IS 10303-42:1994, p. 81 for the final definition of the formal standard.
HISTORY New entity in IFC2x4.
Subclassed by Ifc4x3_rc1::IfcRationalBSplineSurfaceWithKnots
The multiplicities of the knots in the u parameter direction.
The multiplicities of the knots in the v parameter direction.
The list of the distinct knots in the u parameter direction.
The list of the distinct knots in the v parameter direction.
IfcBSplineSurfaceWithKnots(int v1_UDegree, int v2_VDegree, IfcTemplatedEntityListList<::Ifc4x3_rc1::IfcCartesianPoint>::ptr v3_ControlPointsList, ::Ifc4x3_rc1::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, ::Ifc4x3_rc1::IfcKnotType::Value v12_KnotSpec)¶