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0030645: Modeling Algorithms - B-spline segmentation produces wrong parametrization

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Method Segment() of B-spline curve and surface has been extended by parameter theTolerance (theUTolerance and theVTolerance for surface), which defines the proximity between knots of a NURBS and boundaries of cutting segment. The default value of the tolerance is Precision::PConfusion().
Test cases have been added to check segmenting of B-spline surface and curves both 2D and 3D.
This commit is contained in:
azv
2019-04-13 14:57:39 +03:00
committed by bugmaster
parent d1775ee992
commit 6fd9bdf2cc
12 changed files with 334 additions and 342 deletions
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5
src/Geom2d/Geom2d_BSplineCurve.cxx
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@@ -650,13 +650,14 @@ Standard_Real Geom2d_BSplineCurve::ReversedParameter( const Standard_Real U) con
//purpose :
//=======================================================================
void Geom2d_BSplineCurve::Segment(const Standard_Real aU1,
const Standard_Real aU2)
const Standard_Real aU2,
const Standard_Real theTolerance)
{
if (aU2 < aU1)
throw Standard_DomainError("Geom2d_BSplineCurve::Segment");
//
Standard_Real AbsUMax = Max(Abs(FirstParameter()),Abs(LastParameter()));
Standard_Real Eps = Max (Epsilon(AbsUMax), Precision::PConfusion());
Standard_Real Eps = Max (Epsilon(AbsUMax), theTolerance);
Standard_Real NewU1, NewU2;
Standard_Real U, DU=0;
Standard_Integer i, k, index;

8
src/Geom2d/Geom2d_BSplineCurve.hxx
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@@ -20,6 +20,7 @@
#include <Standard.hxx>
#include <Standard_Type.hxx>
#include <Precision.hxx>
#include <Standard_Boolean.hxx>
#include <GeomAbs_BSplKnotDistribution.hxx>
#include <GeomAbs_Shape.hxx>
@@ -356,6 +357,10 @@ public:
//! All data structure tables of this BSpline curve are
//! modified, but the knots located between U1 and U2
//! are retained. The degree of the curve is not modified.
//!
//! Parameter theTolerance defines the possible proximity of the segment
//! boundaries and B-spline knots to treat them as equal.
//!
//! Warnings :
//! Even if <me> is not closed it can become closed after the
//! segmentation for example if U1 or U2 are out of the bounds
@@ -369,7 +374,8 @@ public:
//! raises if U2 < U1.
//! Standard_DomainError if U2 - U1 exceeds the period for periodic curves.
//! i.e. ((U2 - U1) - Period) > Precision::PConfusion().
Standard_EXPORT void Segment (const Standard_Real U1, const Standard_Real U2);
Standard_EXPORT void Segment (const Standard_Real U1, const Standard_Real U2,
const Standard_Real theTolerance = Precision::PConfusion());
//! Modifies this BSpline curve by assigning the value K
//! to the knot of index Index in the knots table. This is a