View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0031493 | Community | OCCT:Modeling Data | public | 2020-04-09 07:36 | 2020-04-09 07:36 |
| Reporter | alexzkw | Assigned To | |||
| Priority | normal | Severity | minor | ||
| Status | new | Resolution | open | ||
| Platform | Windows | OS | Windows | ||
| Product Version | 7.3.0 | ||||
| Summary | 0031493: GCPnts_AbscissaPoint and CPnts_AbscissaPoint do not work properly for abscissa values larger than the curve length | ||||
| Description | GCPnts_AbscissaPoint and CPnts_AbscissaPoint do not work properly for abscissa values larger than the curve length. Lets call the parameter interval of the curve [c0, c1]. The curve seems to be extrapolated correctly for the abscissa calculation within a certain parameter range [p0, p1], with p0 < c0 < c1 < p1. So [p0, p1] contains [c0, c1]. That means: The parameter range where the calculation works well is larger than the parameter range of the curve itself. But outside this larger parameter range [p0, p] the calculation just does not work correctly any more. | ||||
| Steps To Reproduce | TColgp_Array1OfPnt Poles(1, 3); Poles.SetValue(1, gp_Pnt(0, 0, 0)); Poles.SetValue(2, gp_Pnt(1, 0, 0)); Poles.SetValue(3, gp_Pnt(2, 0, 0)); TColStd_Array1OfReal Knots(1, 2); Knots.SetValue(1, 0); Knots.SetValue(2, 1); TColStd_Array1OfInteger Multis(1, 2); Multis.SetValue(1, 3); Multis.SetValue(2, 3); const int Degree = 2; const Handle(Geom_BSplineCurve) BSplineCurve = new Geom_BSplineCurve(Poles, Knots, Multis, Degree, false); const GeomAdaptor_Curve AdaptorCurve(BSplineCurve); // The abscissa values are larger than the curve length const double Abscissa1 = 4; const double Abscissa2 = 8; const GCPnts_AbscissaPoint GC_Abscissa1(AdaptorCurve, Abscissa1, BSplineCurve->FirstParameter()); const GCPnts_AbscissaPoint GC_Abscissa2(AdaptorCurve, Abscissa2, BSplineCurve->FirstParameter()); const CPnts_AbscissaPoint C_Abscissa1(AdaptorCurve, Abscissa1, BSplineCurve->FirstParameter(), 0.001); const CPnts_AbscissaPoint C_Abscissa2(AdaptorCurve, Abscissa2, BSplineCurve->FirstParameter(), 0.001); // The parameters for the different abscissa values should not be equal. // Actual they are equal for both computation methods: GCPnts_AbscissaPoint and CPnts_AbscissaPoint const double GC_Dist1_Param = GC_Abscissa1.Parameter(); const double GC_Dist2_Param = GC_Abscissa2.Parameter(); const double C_Dist1_Param = C_Abscissa1.Parameter(); const double C_Dist2_Param = C_Abscissa2.Parameter(); | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
