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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/BndLib/BndLib_Add3dCurve.cxx
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@ -226,7 +226,10 @@ void BndLib_Add3dCurve::Add( const Adaptor3d_Curve& C,
if(Bsaux->LastParameter() < U2 ) u2 = Bsaux->LastParameter();
// modified by NIZHNY-EAP Fri Dec 3 14:29:18 1999 ___END___
}
Bsaux->Segment(u1, u2);
Standard_Real aSegmentTol = Precision::PConfusion();
if (Abs(u2 - u1) < aSegmentTol)
aSegmentTol = Abs(u2 - u1) * 0.01;
Bsaux->Segment(u1, u2, aSegmentTol);
Bs = Bsaux;
}
//OCC566(apo)->

5
src/Geom/Geom_BSplineCurve.cxx
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@ -491,7 +491,8 @@ Standard_Real Geom_BSplineCurve::ReversedParameter
//=======================================================================
void Geom_BSplineCurve::Segment(const Standard_Real U1,
const Standard_Real U2)
const Standard_Real U2,
const Standard_Real theTolerance)
{
if (U2 < U1)
throw Standard_DomainError("Geom_BSplineCurve::Segment");
@ -539,7 +540,7 @@ void Geom_BSplineCurve::Segment(const Standard_Real U1,
AbsUMax = Max(AbsUMax, Max(Abs(FirstParameter()),Abs(LastParameter())));
// Modified by Sergey KHROMOV - Fri Apr 11 12:15:40 2003 End
Standard_Real Eps = 100. * Epsilon(AbsUMax);
Standard_Real Eps = Max(Epsilon(AbsUMax), theTolerance);
InsertKnots( Knots, Mults, Eps);

8
src/Geom/Geom_BSplineCurve.hxx
View File

@ -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>
@ -290,6 +291,10 @@ 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
@ -298,7 +303,8 @@ 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

474
src/Geom/Geom_BSplineSurface.cxx
View File

@ -529,20 +529,20 @@ void Geom_BSplineSurface::IncreaseVMultiplicity
}
//=======================================================================
//function : Segment
//function : segment
//purpose :
//=======================================================================
void Geom_BSplineSurface::Segment(const Standard_Real U1,
const Standard_Real U2,
const Standard_Real V1,
const Standard_Real V2)
void Geom_BSplineSurface::segment(const Standard_Real U1,
const Standard_Real U2,
const Standard_Real V1,
const Standard_Real V2,
const Standard_Real EpsU,
const Standard_Real EpsV,
const Standard_Boolean SegmentInU,
const Standard_Boolean SegmentInV)
{
if ((U2 < U1) || (V2 < V1))
throw Standard_DomainError("Geom_BSplineSurface::Segment");
Standard_Real deltaU = Max(Abs(U2),Abs(U1));
Standard_Real EpsU = Epsilon(deltaU);
deltaU = U2 - U1;
Standard_Real deltaU = U2 - U1;
if (uperiodic) {
Standard_Real aUPeriod = uknots->Last() - uknots->First();
if (deltaU - aUPeriod > Precision::PConfusion())
@ -550,10 +550,8 @@ void Geom_BSplineSurface::Segment(const Standard_Real U1,
if (deltaU > aUPeriod)
deltaU = aUPeriod;
}
Standard_Real deltaV = Max(Abs(V2),Abs(V1));
Standard_Real EpsV = Epsilon(deltaV);
deltaV = V2 - V1;
Standard_Real deltaV = V2 - V1;
if (vperiodic) {
Standard_Real aVPeriod = vknots->Last() - vknots->First();
if (deltaV - aVPeriod > Precision::PConfusion())
@ -563,50 +561,53 @@ void Geom_BSplineSurface::Segment(const Standard_Real U1,
}
Standard_Real NewU1, NewU2, NewV1, NewV2;
Standard_Real U,V;
Standard_Real U, V;
Standard_Integer indexU, indexV;
// inserting the UKnots
TColStd_Array1OfReal UKnots(1,2);
TColStd_Array1OfInteger UMults(1,2);
indexU = 0;
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
U1,uperiodic,uknots->Lower(),uknots->Upper(),
indexU,NewU1);
BSplCLib::LocateParameter(udeg, uknots->Array1(), umults->Array1(),
U1, uperiodic, uknots->Lower(), uknots->Upper(),
indexU, NewU1);
indexU = 0;
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
U2,uperiodic,uknots->Lower(),uknots->Upper(),
indexU,NewU2);
UKnots( 1) = Min( NewU1, NewU2);
UKnots( 2) = Max( NewU1, NewU2);
UMults( 1) = UMults( 2) = udeg;
InsertUKnots( UKnots, UMults, EpsU);
BSplCLib::LocateParameter(udeg, uknots->Array1(), umults->Array1(),
U2, uperiodic, uknots->Lower(), uknots->Upper(),
indexU, NewU2);
if (SegmentInU) {
// inserting the UKnots
TColStd_Array1OfReal UKnots(1, 2);
TColStd_Array1OfInteger UMults(1, 2);
UKnots(1) = Min(NewU1, NewU2);
UKnots(2) = Max(NewU1, NewU2);
UMults(1) = UMults(2) = udeg;
// Inserting the VKnots
TColStd_Array1OfReal VKnots(1,2);
TColStd_Array1OfInteger VMults(1,2);
InsertUKnots(UKnots, UMults, EpsU);
}
indexV = 0;
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
V1,vperiodic,vknots->Lower(),vknots->Upper(),
indexV,NewV1);
BSplCLib::LocateParameter(vdeg, vknots->Array1(), vmults->Array1(),
V1, vperiodic, vknots->Lower(), vknots->Upper(),
indexV, NewV1);
indexV = 0;
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
V2,vperiodic,vknots->Lower(),vknots->Upper(),
indexV,NewV2);
VKnots( 1) = Min( NewV1, NewV2);
VKnots( 2) = Max( NewV1, NewV2);
VMults( 1) = VMults( 2) = vdeg;
InsertVKnots( VKnots, VMults, EpsV);
BSplCLib::LocateParameter(vdeg, vknots->Array1(), vmults->Array1(),
V2, vperiodic, vknots->Lower(), vknots->Upper(),
indexV, NewV2);
if (SegmentInV) {
// Inserting the VKnots
TColStd_Array1OfReal VKnots(1, 2);
TColStd_Array1OfInteger VMults(1, 2);
VKnots(1) = Min(NewV1, NewV2);
VKnots(2) = Max(NewV1, NewV2);
VMults(1) = VMults(2) = vdeg;
InsertVKnots(VKnots, VMults, EpsV);
}
if (uperiodic) { // set the origine at NewU1
if (uperiodic && SegmentInU) { // set the origine at NewU1
Standard_Integer index = 0;
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
U1,uperiodic,uknots->Lower(),uknots->Upper(),
index,U);
if ( Abs(uknots->Value(index+1)-U) <= EpsU)
BSplCLib::LocateParameter(udeg, uknots->Array1(), umults->Array1(),
U1, uperiodic, uknots->Lower(), uknots->Upper(),
index, U);
if (Abs(uknots->Value(index + 1) - U) <= EpsU)
index++;
SetUOrigin(index);
SetUNotPeriodic();
@ -615,37 +616,38 @@ void Geom_BSplineSurface::Segment(const Standard_Real U1,
// compute index1 and index2 to set the new knots and mults
Standard_Integer index1U = 0, index2U = 0;
Standard_Integer FromU1 = uknots->Lower();
Standard_Integer ToU2 = uknots->Upper();
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
NewU1,uperiodic,FromU1,ToU2,index1U,U);
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
NewU1 + deltaU,uperiodic,FromU1,ToU2,index2U,U);
if ( Abs(uknots->Value(index2U+1)-U) <= EpsU)
Standard_Integer ToU2 = uknots->Upper();
BSplCLib::LocateParameter(udeg, uknots->Array1(), umults->Array1(),
NewU1, uperiodic, FromU1, ToU2, index1U, U);
BSplCLib::LocateParameter(udeg, uknots->Array1(), umults->Array1(),
NewU1 + deltaU, uperiodic, FromU1, ToU2, index2U, U);
if (Abs(uknots->Value(index2U + 1) - U) <= EpsU)
index2U++;
Standard_Integer nbuknots = index2U - index1U + 1;
Handle(TColStd_HArray1OfReal)
nuknots = new TColStd_HArray1OfReal(1,nbuknots);
Handle(TColStd_HArray1OfInteger)
numults = new TColStd_HArray1OfInteger(1,nbuknots);
Handle(TColStd_HArray1OfReal)
nuknots = new TColStd_HArray1OfReal(1, nbuknots);
Handle(TColStd_HArray1OfInteger)
numults = new TColStd_HArray1OfInteger(1, nbuknots);
Standard_Integer i , k = 1;
for ( i = index1U; i<= index2U; i++) {
Standard_Integer i, k = 1;
for (i = index1U; i <= index2U; i++) {
nuknots->SetValue(k, uknots->Value(i));
numults->SetValue(k, umults->Value(i));
k++;
}
numults->SetValue( 1, udeg + 1);
numults->SetValue(nbuknots, udeg + 1);
if (SegmentInU) {
numults->SetValue(1, udeg + 1);
numults->SetValue(nbuknots, udeg + 1);
}
if (vperiodic) { // set the origine at NewV1
if (vperiodic&& SegmentInV) { // set the origine at NewV1
Standard_Integer index = 0;
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
V1,vperiodic,vknots->Lower(),vknots->Upper(),
index,V);
if ( Abs(vknots->Value(index+1)-V) <= EpsV)
BSplCLib::LocateParameter(vdeg, vknots->Array1(), vmults->Array1(),
V1, vperiodic, vknots->Lower(), vknots->Upper(),
index, V);
if (Abs(vknots->Value(index + 1) - V) <= EpsV)
index++;
SetVOrigin(index);
SetVNotPeriodic();
@ -654,79 +656,80 @@ void Geom_BSplineSurface::Segment(const Standard_Real U1,
// compute index1 and index2 to set the new knots and mults
Standard_Integer index1V = 0, index2V = 0;
Standard_Integer FromV1 = vknots->Lower();
Standard_Integer ToV2 = vknots->Upper();
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
NewV1,vperiodic,FromV1,ToV2,index1V,V);
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
NewV1 + deltaV,vperiodic,FromV1,ToV2,index2V,V);
if ( Abs(vknots->Value(index2V+1)-V) <= EpsV)
Standard_Integer ToV2 = vknots->Upper();
BSplCLib::LocateParameter(vdeg, vknots->Array1(), vmults->Array1(),
NewV1, vperiodic, FromV1, ToV2, index1V, V);
BSplCLib::LocateParameter(vdeg, vknots->Array1(), vmults->Array1(),
NewV1 + deltaV, vperiodic, FromV1, ToV2, index2V, V);
if (Abs(vknots->Value(index2V + 1) - V) <= EpsV)
index2V++;
Standard_Integer nbvknots = index2V - index1V + 1;
Handle(TColStd_HArray1OfReal)
nvknots = new TColStd_HArray1OfReal(1,nbvknots);
Handle(TColStd_HArray1OfInteger)
nvmults = new TColStd_HArray1OfInteger(1,nbvknots);
Handle(TColStd_HArray1OfReal)
nvknots = new TColStd_HArray1OfReal(1, nbvknots);
Handle(TColStd_HArray1OfInteger)
nvmults = new TColStd_HArray1OfInteger(1, nbvknots);
k = 1;
for ( i = index1V; i<= index2V; i++) {
for (i = index1V; i <= index2V; i++) {
nvknots->SetValue(k, vknots->Value(i));
nvmults->SetValue(k, vmults->Value(i));
k++;
}
nvmults->SetValue( 1, vdeg + 1);
nvmults->SetValue(nbvknots, vdeg + 1);
if (SegmentInV) {
nvmults->SetValue(1, vdeg + 1);
nvmults->SetValue(nbvknots, vdeg + 1);
}
// compute index1 and index2 to set the new poles and weights
Standard_Integer pindex1U
= BSplCLib::PoleIndex(udeg,index1U,uperiodic,umults->Array1());
Standard_Integer pindex2U
= BSplCLib::PoleIndex(udeg,index2U,uperiodic,umults->Array1());
Standard_Integer pindex1U
= BSplCLib::PoleIndex(udeg, index1U, uperiodic, umults->Array1());
Standard_Integer pindex2U
= BSplCLib::PoleIndex(udeg, index2U, uperiodic, umults->Array1());
pindex1U++;
pindex2U = Min( pindex2U+1, poles->ColLength());
pindex2U = Min(pindex2U + 1, poles->ColLength());
Standard_Integer nbupoles = pindex2U - pindex1U + 1;
Standard_Integer nbupoles = pindex2U - pindex1U + 1;
// compute index1 and index2 to set the new poles and weights
Standard_Integer pindex1V
= BSplCLib::PoleIndex(vdeg,index1V,vperiodic,vmults->Array1());
Standard_Integer pindex2V
= BSplCLib::PoleIndex(vdeg,index2V,vperiodic,vmults->Array1());
Standard_Integer pindex1V
= BSplCLib::PoleIndex(vdeg, index1V, vperiodic, vmults->Array1());
Standard_Integer pindex2V
= BSplCLib::PoleIndex(vdeg, index2V, vperiodic, vmults->Array1());
pindex1V++;
pindex2V = Min( pindex2V+1, poles->RowLength());
pindex2V = Min(pindex2V + 1, poles->RowLength());
Standard_Integer nbvpoles = pindex2V - pindex1V + 1;
Standard_Integer nbvpoles = pindex2V - pindex1V + 1;
Handle(TColStd_HArray2OfReal) nweights;
Handle(TColStd_HArray2OfReal) nweights;
Handle(TColgp_HArray2OfPnt)
npoles = new TColgp_HArray2OfPnt(1,nbupoles,1,nbvpoles);
npoles = new TColgp_HArray2OfPnt(1, nbupoles, 1, nbvpoles);
k = 1;
Standard_Integer j, l;
if ( urational || vrational) {
nweights = new TColStd_HArray2OfReal( 1,nbupoles,1,nbvpoles);
for ( i = pindex1U; i <= pindex2U; i++) {
if (urational || vrational) {
nweights = new TColStd_HArray2OfReal(1, nbupoles, 1, nbvpoles);
for (i = pindex1U; i <= pindex2U; i++) {
l = 1;
for ( j = pindex1V; j <= pindex2V; j++) {
npoles->SetValue(k,l, poles->Value(i,j));
nweights->SetValue(k,l, weights->Value(i,j));
l++;
for (j = pindex1V; j <= pindex2V; j++) {
npoles->SetValue(k, l, poles->Value(i, j));
nweights->SetValue(k, l, weights->Value(i, j));
l++;
}
k++;
}
}
else {
for ( i = pindex1U; i <= pindex2U; i++) {
for (i = pindex1U; i <= pindex2U; i++) {
l = 1;
for ( j = pindex1V; j <= pindex2V; j++) {
npoles->SetValue(k,l, poles->Value(i,j));
l++;
for (j = pindex1V; j <= pindex2V; j++) {
npoles->SetValue(k, l, poles->Value(i, j));
l++;
}
k++;
}
@ -737,16 +740,39 @@ void Geom_BSplineSurface::Segment(const Standard_Real U1,
vknots = nvknots;
vmults = nvmults;
poles = npoles;
if ( urational || vrational)
if (urational || vrational)
weights = nweights;
else
weights = new TColStd_HArray2OfReal (1,poles->ColLength(),
1,poles->RowLength(), 1.0);
else
weights = new TColStd_HArray2OfReal(1, poles->ColLength(),
1, poles->RowLength(), 1.0);
maxderivinvok = 0;
UpdateUKnots();
UpdateVKnots();
}
//=======================================================================
//function : Segment
//purpose :
//=======================================================================
void Geom_BSplineSurface::Segment(const Standard_Real U1,
const Standard_Real U2,
const Standard_Real V1,
const Standard_Real V2,
const Standard_Real theUTolerance,
const Standard_Real theVTolerance)
{
if ((U2 < U1) || (V2 < V1))
throw Standard_DomainError("Geom_BSplineSurface::Segment");
Standard_Real aMaxU = Max(Abs(U2), Abs(U1));
Standard_Real EpsU = Max(Epsilon(aMaxU), theUTolerance);
Standard_Real aMaxV = Max(Abs(V2), Abs(V1));
Standard_Real EpsV = Max(Epsilon(aMaxV), theVTolerance);
segment(U1, U2, V1, V2, EpsU, EpsV, Standard_True, Standard_True);
}
//=======================================================================
@ -755,38 +781,21 @@ void Geom_BSplineSurface::Segment(const Standard_Real U1,
//=======================================================================
void Geom_BSplineSurface::CheckAndSegment(const Standard_Real U1,
const Standard_Real U2,
const Standard_Real V1,
const Standard_Real V2)
const Standard_Real U2,
const Standard_Real V1,
const Standard_Real V2,
const Standard_Real theUTolerance,
const Standard_Real theVTolerance)
{
if ((U2 < U1) || (V2 < V1))
throw Standard_DomainError("Geom_BSplineSurface::CheckAndSegment");
Standard_Real deltaU = Max(Abs(U2),Abs(U1));
Standard_Real EpsU = Epsilon(deltaU);
deltaU = U2 - U1;
if (uperiodic) {
Standard_Real aUPeriod = uknots->Last() - uknots->First();
if (deltaU - aUPeriod > Precision::PConfusion())
throw Standard_DomainError("Geom_BSplineSurface::CheckAndSegment");
if (deltaU > aUPeriod)
deltaU = aUPeriod;
}
Standard_Real deltaV = Max(Abs(V2),Abs(V1));
Standard_Real EpsV = Epsilon(deltaV);
deltaV = V2 - V1;
if (vperiodic) {
Standard_Real aVPeriod = vknots->Last() - vknots->First();
if (deltaV - aVPeriod > Precision::PConfusion())
throw Standard_DomainError("Geom_BSplineSurface::CheckAndSegment");
if (deltaV > aVPeriod)
deltaV = aVPeriod;
}
Standard_Real NewU1, NewU2, NewV1, NewV2;
Standard_Real U,V;
Standard_Integer indexU, indexV;
Standard_Real aMaxU = Max(Abs(U2), Abs(U1));
Standard_Real EpsU = Max(Epsilon(aMaxU), theUTolerance);
Standard_Real aMaxV = Max(Abs(V2), Abs(V1));
Standard_Real EpsV = Max(Epsilon(aMaxV), theVTolerance);
Standard_Boolean segment_in_U = Standard_True;
Standard_Boolean segment_in_V = Standard_True;
@ -795,192 +804,7 @@ void Geom_BSplineSurface::CheckAndSegment(const Standard_Real U1,
segment_in_V = ( Abs(V1 - vknots->Value(vknots->Lower())) > EpsV )
|| ( Abs(V2 - vknots->Value(vknots->Upper())) > EpsV );
indexU = 0;
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
U1,uperiodic,uknots->Lower(),uknots->Upper(),
indexU,NewU1);
indexU = 0;
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
U2,uperiodic,uknots->Lower(),uknots->Upper(),
indexU,NewU2);
if (segment_in_U) {
// inserting the UKnots
TColStd_Array1OfReal UKnots(1,2);
TColStd_Array1OfInteger UMults(1,2);
UKnots( 1) = Min( NewU1, NewU2);
UKnots( 2) = Max( NewU1, NewU2);
UMults( 1) = UMults( 2) = udeg;
InsertUKnots( UKnots, UMults, EpsU);
}
indexV = 0;
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
V1,vperiodic,vknots->Lower(),vknots->Upper(),
indexV,NewV1);
indexV = 0;
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
V2,vperiodic,vknots->Lower(),vknots->Upper(),
indexV,NewV2);
if (segment_in_V) {
// Inserting the VKnots
TColStd_Array1OfReal VKnots(1,2);
TColStd_Array1OfInteger VMults(1,2);
VKnots( 1) = Min( NewV1, NewV2);
VKnots( 2) = Max( NewV1, NewV2);
VMults( 1) = VMults( 2) = vdeg;
InsertVKnots( VKnots, VMults, EpsV);
}
if (uperiodic && segment_in_U) { // set the origine at NewU1
Standard_Integer index = 0;
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
U1,uperiodic,uknots->Lower(),uknots->Upper(),
index,U);
if ( Abs(uknots->Value(index+1)-U) <= EpsU)
index++;
SetUOrigin(index);
SetUNotPeriodic();
}
// compute index1 and index2 to set the new knots and mults
Standard_Integer index1U = 0, index2U = 0;
Standard_Integer FromU1 = uknots->Lower();
Standard_Integer ToU2 = uknots->Upper();
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
NewU1,uperiodic,FromU1,ToU2,index1U,U);
BSplCLib::LocateParameter(udeg,uknots->Array1(),umults->Array1(),
NewU1 + deltaU,uperiodic,FromU1,ToU2,index2U,U);
if ( Abs(uknots->Value(index2U+1)-U) <= EpsU)
index2U++;
Standard_Integer nbuknots = index2U - index1U + 1;
Handle(TColStd_HArray1OfReal)
nuknots = new TColStd_HArray1OfReal(1,nbuknots);
Handle(TColStd_HArray1OfInteger)
numults = new TColStd_HArray1OfInteger(1,nbuknots);
Standard_Integer i , k = 1;
for ( i = index1U; i<= index2U; i++) {
nuknots->SetValue(k, uknots->Value(i));
numults->SetValue(k, umults->Value(i));
k++;
}
if (segment_in_U) {
numults->SetValue( 1, udeg + 1);
numults->SetValue(nbuknots, udeg + 1);
}
if (vperiodic&& segment_in_V) { // set the origine at NewV1
Standard_Integer index = 0;
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
V1,vperiodic,vknots->Lower(),vknots->Upper(),
index,V);
if ( Abs(vknots->Value(index+1)-V) <= EpsV)
index++;
SetVOrigin(index);
SetVNotPeriodic();
}
// compute index1 and index2 to set the new knots and mults
Standard_Integer index1V = 0, index2V = 0;
Standard_Integer FromV1 = vknots->Lower();
Standard_Integer ToV2 = vknots->Upper();
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
NewV1,vperiodic,FromV1,ToV2,index1V,V);
BSplCLib::LocateParameter(vdeg,vknots->Array1(),vmults->Array1(),
NewV1 + deltaV,vperiodic,FromV1,ToV2,index2V,V);
if ( Abs(vknots->Value(index2V+1)-V) <= EpsV)
index2V++;
Standard_Integer nbvknots = index2V - index1V + 1;
Handle(TColStd_HArray1OfReal)
nvknots = new TColStd_HArray1OfReal(1,nbvknots);
Handle(TColStd_HArray1OfInteger)
nvmults = new TColStd_HArray1OfInteger(1,nbvknots);
k = 1;
for ( i = index1V; i<= index2V; i++) {
nvknots->SetValue(k, vknots->Value(i));
nvmults->SetValue(k, vmults->Value(i));
k++;
}
if (segment_in_V) {
nvmults->SetValue( 1, vdeg + 1);
nvmults->SetValue(nbvknots, vdeg + 1);
}
// compute index1 and index2 to set the new poles and weights
Standard_Integer pindex1U
= BSplCLib::PoleIndex(udeg,index1U,uperiodic,umults->Array1());
Standard_Integer pindex2U
= BSplCLib::PoleIndex(udeg,index2U,uperiodic,umults->Array1());
pindex1U++;
pindex2U = Min( pindex2U+1, poles->ColLength());
Standard_Integer nbupoles = pindex2U - pindex1U + 1;
// compute index1 and index2 to set the new poles and weights
Standard_Integer pindex1V
= BSplCLib::PoleIndex(vdeg,index1V,vperiodic,vmults->Array1());
Standard_Integer pindex2V
= BSplCLib::PoleIndex(vdeg,index2V,vperiodic,vmults->Array1());
pindex1V++;
pindex2V = Min( pindex2V+1, poles->RowLength());
Standard_Integer nbvpoles = pindex2V - pindex1V + 1;
Handle(TColStd_HArray2OfReal) nweights;
Handle(TColgp_HArray2OfPnt)
npoles = new TColgp_HArray2OfPnt(1,nbupoles,1,nbvpoles);
k = 1;
Standard_Integer j, l;
if ( urational || vrational) {
nweights = new TColStd_HArray2OfReal( 1,nbupoles,1,nbvpoles);
for ( i = pindex1U; i <= pindex2U; i++) {
l = 1;
for ( j = pindex1V; j <= pindex2V; j++) {
npoles->SetValue(k,l, poles->Value(i,j));
nweights->SetValue(k,l, weights->Value(i,j));
l++;
}
k++;
}
}
else {
for ( i = pindex1U; i <= pindex2U; i++) {
l = 1;
for ( j = pindex1V; j <= pindex2V; j++) {
npoles->SetValue(k,l, poles->Value(i,j));
l++;
}
k++;
}
}
uknots = nuknots;
umults = numults;
vknots = nvknots;
vmults = nvmults;
poles = npoles;
if ( urational || vrational)
weights = nweights;
else
weights = new TColStd_HArray2OfReal (1,poles->ColLength(),
1,poles->RowLength(), 1.0);
maxderivinvok = 0;
UpdateUKnots();
UpdateVKnots();
segment(U1, U2, V1, V2, EpsU, EpsV, segment_in_U, segment_in_V);
}
//=======================================================================

27
src/Geom/Geom_BSplineSurface.hxx
View File

@ -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>
@ -547,6 +548,10 @@ public:
//! between V1 and V2 in the V-Direction.
//! The control points are modified, the first and the last point
//! are not the same.
//!
//! Parameters theUTolerance, theVTolerance define the possible proximity along the correponding
//! direction 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
@ -556,7 +561,9 @@ public:
//! i.e. ((U2 - U1) - UPeriod) > Precision::PConfusion().
//! Standard_DomainError if V2 - V1 exceeds the vperiod for vperiodic surfaces.
//! i.e. ((V2 - V1) - VPeriod) > Precision::PConfusion()).
Standard_EXPORT void Segment (const Standard_Real U1, const Standard_Real U2, const Standard_Real V1, const Standard_Real V2);
Standard_EXPORT void Segment (const Standard_Real U1, const Standard_Real U2, const Standard_Real V1, const Standard_Real V2,
const Standard_Real theUTolerance = Precision::PConfusion(),
const Standard_Real theVTolerance = Precision::PConfusion());
//! Segments the surface between U1 and U2 in the U-Direction.
@ -567,6 +574,9 @@ public:
//! For example, if <me> is periodic in V, it will be always periodic
//! in V after the segmentation if the bounds in V are unchanged
//!
//! Parameters theUTolerance, theVTolerance define the possible proximity along the correponding
//! direction 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
@ -576,7 +586,9 @@ public:
//! i.e. ((U2 - U1) - UPeriod) > Precision::PConfusion().
//! Standard_DomainError if V2 - V1 exceeds the vperiod for vperiodic surfaces.
//! i.e. ((V2 - V1) - VPeriod) > Precision::PConfusion()).
Standard_EXPORT void CheckAndSegment (const Standard_Real U1, const Standard_Real U2, const Standard_Real V1, const Standard_Real V2);
Standard_EXPORT void CheckAndSegment (const Standard_Real U1, const Standard_Real U2, const Standard_Real V1, const Standard_Real V2,
const Standard_Real theUTolerance = Precision::PConfusion(),
const Standard_Real theVTolerance = Precision::PConfusion());
//! Substitutes the UKnots of range UIndex with K.
//!
@ -1184,7 +1196,16 @@ public:
protected:
//! Segments the surface between U1 and U2 in the U-Direction.
//! between V1 and V2 in the V-Direction.
//! The control points are modified, the first and the last point
//! are not the same.
//!
//! Parameters EpsU, EpsV define the proximity along U-Direction and V-Direction respectively.
void segment(const Standard_Real U1, const Standard_Real U2,
const Standard_Real V1, const Standard_Real V2,
const Standard_Real EpsU, const Standard_Real EpsV,
const Standard_Boolean SegmentInU, const Standard_Boolean SegmentInV);
private:

5
src/Geom2d/Geom2d_BSplineCurve.cxx
View File

@ -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
View File

@ -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

12
src/GeomliteTest/GeomliteTest_CurveCommands.cxx
View File

@ -1131,7 +1131,7 @@ static Standard_Integer value2d (Draw_Interpretor& ,
static Standard_Integer segment (Draw_Interpretor& , Standard_Integer n, const char** a)
{
if (n < 4) return 1;
if (n < 4 || n > 5) return 1;
Handle(Geom_BezierCurve) GBz = DrawTrSurf::GetBezierCurve(a[1]);
Handle(Geom_BSplineCurve) GBs = DrawTrSurf::GetBSplineCurve(a[1]);
@ -1140,14 +1140,18 @@ static Standard_Integer segment (Draw_Interpretor& , Standard_Integer n, const c
Standard_Real f = Draw::Atof(a[2]), l = Draw::Atof(a[3]);
Standard_Real aTolerance = Precision::PConfusion();
if (n == 5)
aTolerance = Draw::Atof(a[4]);
if (!GBz.IsNull())
GBz->Segment(f,l);
else if (!GBs.IsNull())
GBs->Segment(f,l);
GBs->Segment(f, l, aTolerance);
else if (!GBz2d.IsNull())
GBz2d->Segment(f,l);
else if (!GBs2d.IsNull())
GBs2d->Segment(f,l);
GBs2d->Segment(f, l, aTolerance);
else
return 1;
@ -2135,7 +2139,7 @@ void GeomliteTest::CurveCommands(Draw_Interpretor& theCommands)
csetperiodic,g);
theCommands.Add("segment",
"segment name Ufirst Ulast",
"segment name Ufirst Ulast [tol]",
__FILE__,
segment , g);

14
src/GeomliteTest/GeomliteTest_SurfaceCommands.cxx
View File

@ -1351,7 +1351,7 @@ static Standard_Integer exchuv (Draw_Interpretor& , Standard_Integer n, const ch
static Standard_Integer segsur (Draw_Interpretor& , Standard_Integer n, const char** a)
{
if (n < 6) return 1;
if (n < 6 || n > 8) return 1;
Handle(Geom_BezierSurface) GBz = DrawTrSurf::GetBezierSurface(a[1]);
Handle(Geom_BSplineSurface) GBs;
@ -1359,7 +1359,15 @@ static Standard_Integer segsur (Draw_Interpretor& , Standard_Integer n, const ch
GBs = DrawTrSurf::GetBSplineSurface(a[1]);
if (GBs.IsNull())
return 1;
GBs->Segment(Draw::Atof(a[2]),Draw::Atof(a[3]),Draw::Atof(a[4]),Draw::Atof(a[5]));
Standard_Real aUTolerance = Precision::PConfusion();
Standard_Real aVTolerance = Precision::PConfusion();
if (n >= 7)
aUTolerance = aVTolerance = Draw::Atof(a[6]);
if (n == 8)
aVTolerance = Draw::Atof(a[7]);
GBs->Segment(Draw::Atof(a[2]),Draw::Atof(a[3]),Draw::Atof(a[4]),Draw::Atof(a[5]), aUTolerance, aVTolerance);
}
else {
GBz->Segment(Draw::Atof(a[2]),Draw::Atof(a[3]),Draw::Atof(a[4]),Draw::Atof(a[5]));
@ -1770,7 +1778,7 @@ void GeomliteTest::SurfaceCommands(Draw_Interpretor& theCommands)
exchuv,g);
theCommands.Add("segsur",
"segsur name Ufirst Ulast Vfirst Vlast",
"segsur name Ufirst Ulast Vfirst Vlast [Utol [Vtol]]",
__FILE__,
segsur , g);

32
tests/bugs/modalg_7/bug30645_1 Normal file
View File

@ -0,0 +1,32 @@
puts "========"
puts "0030645: Modeling Algorithms - B-spline segmentation produces wrong parametrization"
puts "========"
puts ""
restore [locate_data_file bug30645.brep] result
set tolerance 1.e-9
segsur result 13.527990713022374 14.030423915738853 54.831990159753303 59.000000000000028 $tolerance
set surf [dump result]
regexp {VKnots +:\n(.*)} $surf full vknots
set is_different_knots 1
set vknots_list {}
while { "$vknots" != "\n\n" && $is_different_knots } {
regexp { +([0-9]+) +: +([-0-9.+eE]+) *([0-9]+)\n(.*)} $vknots full index knot weight rest
foreach k $vknots_list {
if { [expr abs($k - $knot)] < $tolerance } {
set is_different_knots 0
}
}
lappend vknots_list $knot
set vknots $rest
}
if { $is_different_knots } {
puts "OK: all knots are different"
} else {
puts "ERROR: segment has knots too close"
}

42
tests/bugs/modalg_7/bug30645_2 Normal file
View File

@ -0,0 +1,42 @@
puts "========"
puts "0030645: Modeling Algorithms - B-spline segmentation produces wrong parametrization"
puts "========"
puts ""
bsplinecurve result 3 4 \
2.0 4 2.5 2 2.9 2 3.0 4 \
117.9 0.0 11.6 1 \
116.7 0.0 11 1 \
115.8 0.0 10.5 1 \
114.4 0.0 9.7 1 \
113.9 0.0 9.4 1 \
113.3 0.0 9.1 1 \
113.1 0.0 9.0 1 \
113.0 0.0 8.9 1
set tolerance 2.e-9
segment result 2.5 2.900000001 $tolerance
set crv [dump result]
regexp {Knots +:\n(.*)} $crv full knots
set is_different_knots 1
set knots_list {}
while { "$knots" != "\n" && $is_different_knots } {
regexp { +([0-9]+) +: +([-0-9.+eE]+) *([0-9]+)\n(.*)} $knots full index knot weight rest
foreach k $knots_list {
if { [expr abs($k - $knot)] < $tolerance } {
set is_different_knots 0
}
}
lappend knots_list $knot
set knots $rest
}
if { $is_different_knots } {
puts "OK: all knots are different"
} else {
puts "ERROR: segment has knots too close"
}

44
tests/bugs/modalg_7/bug30645_3 Normal file
View File

@ -0,0 +1,44 @@
puts "========"
puts "0030645: Modeling Algorithms - B-spline segmentation produces wrong parametrization"
puts "========"
puts ""
2dbsplinecurve result 3 4 \
2.0 4 2.5 2 2.9 2 3.0 4 \
117.9 11.6 1 \
116.7 11 1 \
115.8 10.5 1 \
114.4 9.7 1 \
113.9 9.4 1 \
113.3 9.1 1 \
113.1 9.0 1 \
113.0 8.9 1
set tolerance 1.e-9
segment result 2.5 2.900000000001 $tolerance
set crv [dump result]
regexp {Knots +:\n(.*)} $crv full knots
set is_different_knots 1
set knots_list {}
while { "$knots" != "\n" && $is_different_knots } {
regexp { +([0-9]+) +: +([-0-9.+eE]+) *([0-9]+)\n(.*)} $knots full index knot weight rest
puts $knot
puts $rest
foreach k $knots_list {
if { [expr abs($k - $knot)] < $tolerance } {
set is_different_knots 0
}
}
lappend knots_list $knot
set knots $rest
}
if { $is_different_knots } {
puts "OK: all knots are different"
} else {
puts "ERROR: segment has knots too close"
}