Open CASCADE Technology
7.1.0.beta

This algorithm converts a Bspline surface into several Bezier surfaces. It uses an algorithm of knot insertion. A BSplineSurfaceToBezierSurface object provides a framework for: More...
#include <GeomConvert_BSplineSurfaceToBezierSurface.hxx>
Public Member Functions  
GeomConvert_BSplineSurfaceToBezierSurface (const Handle< Geom_BSplineSurface > &BasisSurface)  
Computes all the data needed to convert. More...  
GeomConvert_BSplineSurfaceToBezierSurface (const Handle< Geom_BSplineSurface > &BasisSurface, const Standard_Real U1, const Standard_Real U2, const Standard_Real V1, const Standard_Real V2, const Standard_Real ParametricTolerance)  
Computes all the data needed to convert the patch of the BSpline surface BasisSurface limited by the two parameter values U1 and U2 in the u parametric direction, and by the two parameter values V1 and V2 in the v parametric direction, into a series of adjacent Bezier surfaces. The result consists of a grid of BasisSurface patches limited by isoparametric curves corresponding to knot values, both in the u and v parametric directions of the surface. A row in the grid corresponds to a series of adjacent patches, all limited by the same two uisoparametric curves. A column in the grid corresponds to a series of adjacent patches, all limited by the same two visoparametric curves. Use the available interrogation functions to ascertain the number of computed Bezier patches, and then to construct each individual Bezier surface (or all Bezier surfaces). Note: ParametricTolerance is not used. Raises DomainError if U1 or U2 or V1 or V2 are out of the parametric bounds of the basis surface [FirstUKnotIndex, LastUKnotIndex] , [FirstVKnotIndex, LastVKnotIndex] The tolerance criterion is ParametricTolerance. Raised if U2  U1 <= ParametricTolerance or V2  V1 <= ParametricTolerance. More...  
Handle< Geom_BezierSurface >  Patch (const Standard_Integer UIndex, const Standard_Integer VIndex) 
Constructs and returns the Bezier surface of indices (UIndex, VIndex) to the patch grid computed on the BSpline surface analyzed by this algorithm. This Bezier surface has the same orientation as the BSpline surface analyzed in this framework. UIndex is an index common to a row in the patch grid. A row in the grid corresponds to a series of adjacent patches, all limited by the same two uisoparametric curves of the surface. VIndex is an index common to a column in the patch grid. A column in the grid corresponds to a series of adjacent patches, all limited by the same two visoparametric curves of the surface. Exceptions Standard_OutOfRange if: More...  
void  Patches (TColGeom_Array2OfBezierSurface &Surfaces) 
Constructs all the Bezier surfaces whose data is computed by this algorithm, and loads them into the Surfaces table. These Bezier surfaces have the same orientation as the BSpline surface analyzed in this framework. The Surfaces array is organised in the same way as the patch grid computed on the BSpline surface analyzed by this algorithm. A row in the array corresponds to a series of adjacent patches, all limited by the same two uisoparametric curves of the surface. A column in the array corresponds to a series of adjacent patches, all limited by the same two visoparametric curves of the surface. Exceptions Standard_DimensionError if the Surfaces array was not created with the following bounds: More...  
void  UKnots (TColStd_Array1OfReal &TKnots) const 
This methode returns the bspline's uknots associated to the converted Patches Raised if the length of Curves is not equal to NbUPatches + 1. More...  
void  VKnots (TColStd_Array1OfReal &TKnots) const 
This methode returns the bspline's vknots associated to the converted Patches Raised if the length of Curves is not equal to NbVPatches + 1. More...  
Standard_Integer  NbUPatches () const 
Returns the number of Bezier surfaces in the U direction. If at the creation time you have decomposed the basis Surface between the parametric values UFirst, ULast the number of Bezier surfaces in the U direction depends on the number of knots included inside the interval [UFirst, ULast]. If you have decomposed the whole basis Bspline surface the number of Bezier surfaces NbUPatches is equal to the number of UKnots less one. More...  
Standard_Integer  NbVPatches () const 
Returns the number of Bezier surfaces in the V direction. If at the creation time you have decomposed the basis surface between the parametric values VFirst, VLast the number of Bezier surfaces in the V direction depends on the number of knots included inside the interval [VFirst, VLast]. If you have decomposed the whole basis Bspline surface the number of Bezier surfaces NbVPatches is equal to the number of VKnots less one. More...  
This algorithm converts a Bspline surface into several Bezier surfaces. It uses an algorithm of knot insertion. A BSplineSurfaceToBezierSurface object provides a framework for:
GeomConvert_BSplineSurfaceToBezierSurface::GeomConvert_BSplineSurfaceToBezierSurface  (  const Handle< Geom_BSplineSurface > &  BasisSurface  ) 
Computes all the data needed to convert.
GeomConvert_BSplineSurfaceToBezierSurface::GeomConvert_BSplineSurfaceToBezierSurface  (  const Handle< Geom_BSplineSurface > &  BasisSurface, 
const Standard_Real  U1,  
const Standard_Real  U2,  
const Standard_Real  V1,  
const Standard_Real  V2,  
const Standard_Real  ParametricTolerance  
) 
Computes all the data needed to convert the patch of the BSpline surface BasisSurface limited by the two parameter values U1 and U2 in the u parametric direction, and by the two parameter values V1 and V2 in the v parametric direction, into a series of adjacent Bezier surfaces. The result consists of a grid of BasisSurface patches limited by isoparametric curves corresponding to knot values, both in the u and v parametric directions of the surface. A row in the grid corresponds to a series of adjacent patches, all limited by the same two uisoparametric curves. A column in the grid corresponds to a series of adjacent patches, all limited by the same two visoparametric curves. Use the available interrogation functions to ascertain the number of computed Bezier patches, and then to construct each individual Bezier surface (or all Bezier surfaces). Note: ParametricTolerance is not used. Raises DomainError if U1 or U2 or V1 or V2 are out of the parametric bounds of the basis surface [FirstUKnotIndex, LastUKnotIndex] , [FirstVKnotIndex, LastVKnotIndex] The tolerance criterion is ParametricTolerance. Raised if U2  U1 <= ParametricTolerance or V2  V1 <= ParametricTolerance.
Standard_Integer GeomConvert_BSplineSurfaceToBezierSurface::NbUPatches  (  )  const 
Returns the number of Bezier surfaces in the U direction. If at the creation time you have decomposed the basis Surface between the parametric values UFirst, ULast the number of Bezier surfaces in the U direction depends on the number of knots included inside the interval [UFirst, ULast]. If you have decomposed the whole basis Bspline surface the number of Bezier surfaces NbUPatches is equal to the number of UKnots less one.
Standard_Integer GeomConvert_BSplineSurfaceToBezierSurface::NbVPatches  (  )  const 
Returns the number of Bezier surfaces in the V direction. If at the creation time you have decomposed the basis surface between the parametric values VFirst, VLast the number of Bezier surfaces in the V direction depends on the number of knots included inside the interval [VFirst, VLast]. If you have decomposed the whole basis Bspline surface the number of Bezier surfaces NbVPatches is equal to the number of VKnots less one.
Handle< Geom_BezierSurface > GeomConvert_BSplineSurfaceToBezierSurface::Patch  (  const Standard_Integer  UIndex, 
const Standard_Integer  VIndex  
) 
Constructs and returns the Bezier surface of indices (UIndex, VIndex) to the patch grid computed on the BSpline surface analyzed by this algorithm. This Bezier surface has the same orientation as the BSpline surface analyzed in this framework. UIndex is an index common to a row in the patch grid. A row in the grid corresponds to a series of adjacent patches, all limited by the same two uisoparametric curves of the surface. VIndex is an index common to a column in the patch grid. A column in the grid corresponds to a series of adjacent patches, all limited by the same two visoparametric curves of the surface. Exceptions Standard_OutOfRange if:
void GeomConvert_BSplineSurfaceToBezierSurface::Patches  (  TColGeom_Array2OfBezierSurface &  Surfaces  ) 
Constructs all the Bezier surfaces whose data is computed by this algorithm, and loads them into the Surfaces table. These Bezier surfaces have the same orientation as the BSpline surface analyzed in this framework. The Surfaces array is organised in the same way as the patch grid computed on the BSpline surface analyzed by this algorithm. A row in the array corresponds to a series of adjacent patches, all limited by the same two uisoparametric curves of the surface. A column in the array corresponds to a series of adjacent patches, all limited by the same two visoparametric curves of the surface. Exceptions Standard_DimensionError if the Surfaces array was not created with the following bounds:
void GeomConvert_BSplineSurfaceToBezierSurface::UKnots  (  TColStd_Array1OfReal &  TKnots  )  const 
This methode returns the bspline's uknots associated to the converted Patches Raised if the length of Curves is not equal to NbUPatches + 1.
void GeomConvert_BSplineSurfaceToBezierSurface::VKnots  (  TColStd_Array1OfReal &  TKnots  )  const 
This methode returns the bspline's vknots associated to the converted Patches Raised if the length of Curves is not equal to NbVPatches + 1.