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0027269: Intersection algorithm produces null-length curve

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Restriction line can correspond to a degenerated edge. In this case we shall return null-curve (instead of Null-length curve).
This commit is contained in:
nbv
2016-04-11 10:38:50 +03:00
committed by bugmaster
parent 246c7a7554
commit b55bd02353
3 changed files with 74 additions and 1 deletions
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37
src/GeomInt/GeomInt_IntSS_1.cxx
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@@ -224,6 +224,37 @@ static void IntersectCurveAndBoundary(const Handle(Geom2d_Curve)& theC2d,
}
}
//=======================================================================
//function : isDegenerated
//purpose : Check if theAHC2d corresponds to a degenerated edge.
//=======================================================================
static Standard_Boolean isDegenerated(const Handle(GeomAdaptor_HSurface)& theGAHS,
const Handle(Adaptor2d_HCurve2d)& theAHC2d,
const Standard_Real theFirstPar,
const Standard_Real theLastPar)
{
const Standard_Real aSqTol = Precision::Confusion()*Precision::Confusion();
gp_Pnt2d aP2d;
gp_Pnt aP1, aP2;
theAHC2d->D0(theFirstPar, aP2d);
theGAHS->D0(aP2d.X(), aP2d.Y(), aP1);
theAHC2d->D0(theLastPar, aP2d);
theGAHS->D0(aP2d.X(), aP2d.Y(), aP2);
if(aP1.SquareDistance(aP2) > aSqTol)
return Standard_False;
theAHC2d->D0(0.5*(theFirstPar+theLastPar), aP2d);
theGAHS->D0(aP2d.X(), aP2d.Y(), aP2);
if(aP1.SquareDistance(aP2) > aSqTol)
return Standard_False;
return Standard_True;
}
//=======================================================================
//function : MakeCurve
//purpose :
@@ -1117,6 +1148,12 @@ void GeomInt_IntSS::TreatRLine(const Handle(IntPatch_RLine)& theRL,
{
return;
}
//Restriction line can correspond to a degenerated edge.
//In this case we return null-curve.
if(isDegenerated(aGAHS, anAHC2d, tf, tl))
return;
//
//To provide sameparameter it is necessary to get 3d curve as
//approximation of curve on surface.