0030422: Random behaviour of BRepAdaptor_CompCurve

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Date Submitted

Last Update

0030422

Open CASCADE

[OCCT] OCCT:Modeling Algorithms

public

2018-12-22 23:37

2020-09-14 22:54

Reporter

agv

Assigned To

msv

Priority

normal

Severity

major

Status

new

Resolution

open

Platform

Windows

VC++ 2015

OS Version

32 bit

Product Version

[OCCT] 7.3.0

Target Version

[OCCT] 7.6.0*

Fixed in Version

Summary

0030422: Random behaviour of BRepAdaptor_CompCurve

Description

With a particular wire, the class BRepAdaptor_CompCurve produces random results. My output is:

FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)
FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)
FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)
FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 3.0000, middle:( -28.048 49.225 79.887)
FP = 0.0000; LP = 1.0000, middle:( -27.613 147.673 8.412)

Reproduced in 7.3.0 / vc14 / 32bit
Similar result in OCCT 7.1 and 7.2 and also with VisualStudio 2010.

Steps To Reproduce

int main()
{
  TopoDS_Shape aShape;
  BRep_Builder aBld;
  for (int i = 0; i < 20; i++) {
    BRepTools::Read(aShape, "sect.brep", aBld);
    const BRepAdaptor_CompCurve aCurve(TopoDS::Wire(aShape));
    const Standard_Real aParam[2] = {
      aCurve.FirstParameter(), aCurve.LastParameter() };
    gp_Pnt aPnt;
    aCurve.D0(0.5 *(aParam[0]+aParam[1]), aPnt);
    printf("FP = %7.4f; LP = %7.4f, middle:(%8.3f %8.3f %8.3f)\n",
           aParam[0], aParam[1], aPnt.X(), aPnt.Y(), aPnt.Z());
  }
  return 0;
}

Issue History
Date Modified	Username	Field	Change
2018-12-22 23:37	agv	New Issue
2018-12-22 23:37	agv	Assigned To	=> msv
2018-12-22 23:37	agv	File Added: sect.brep
2018-12-24 11:06	msv	Target Version	Unscheduled => 7.4.0
2019-08-12 17:45	msv	Target Version	7.4.0 => 7.5.0
2020-09-14 22:54	msv	Target Version	7.5.0 => 7.6.0*

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