1 // Copyright (C) 2007-2008 CEA/DEN, EDF R&D, OPEN CASCADE
3 // Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
4 // CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
6 // This library is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU Lesser General Public
8 // License as published by the Free Software Foundation; either
9 // version 2.1 of the License.
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // Lesser General Public License for more details.
16 // You should have received a copy of the GNU Lesser General Public
17 // License along with this library; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
22 // SMESH SMESH : implementaion of SMESH idl descriptions
23 // File : StdMeshers_MEFISTO_2D.cxx
24 // Moved here from SMESH_MEFISTO_2D.cxx
25 // Author : Paul RASCLE, EDF
28 #include "StdMeshers_MEFISTO_2D.hxx"
30 #include "SMESH_Gen.hxx"
31 #include "SMESH_Mesh.hxx"
32 #include "SMESH_subMesh.hxx"
33 #include "SMESH_Block.hxx"
34 #include "SMESH_MesherHelper.hxx"
35 #include "SMESH_Comment.hxx"
37 #include "StdMeshers_FaceSide.hxx"
38 #include "StdMeshers_MaxElementArea.hxx"
39 #include "StdMeshers_LengthFromEdges.hxx"
44 #include "SMDS_MeshElement.hxx"
45 #include "SMDS_MeshNode.hxx"
46 #include "SMDS_EdgePosition.hxx"
47 #include "SMDS_FacePosition.hxx"
49 #include "utilities.h"
51 #include <BRepTools.hxx>
52 #include <BRep_Tool.hxx>
53 #include <Geom_Curve.hxx>
54 #include <Geom2d_Curve.hxx>
55 #include <Geom_Surface.hxx>
57 #include <TopExp_Explorer.hxx>
58 #include <TopTools_ListIteratorOfListOfShape.hxx>
59 #include <TopTools_ListOfShape.hxx>
60 #include <TopTools_MapOfShape.hxx>
62 #include <TopoDS_Edge.hxx>
63 #include <TopoDS_Face.hxx>
64 #include <TopoDS_Iterator.hxx>
65 #include <gp_Pnt2d.hxx>
67 #include <BRep_Tool.hxx>
68 #include <GProp_GProps.hxx>
69 #include <BRepGProp.hxx>
73 //=============================================================================
77 //=============================================================================
79 StdMeshers_MEFISTO_2D::StdMeshers_MEFISTO_2D(int hypId, int studyId, SMESH_Gen * gen):
80 SMESH_2D_Algo(hypId, studyId, gen)
82 MESSAGE("StdMeshers_MEFISTO_2D::StdMeshers_MEFISTO_2D");
84 _shapeType = (1 << TopAbs_FACE);
85 _compatibleHypothesis.push_back("MaxElementArea");
86 _compatibleHypothesis.push_back("LengthFromEdges");
90 _hypMaxElementArea = NULL;
91 _hypLengthFromEdges = NULL;
95 //=============================================================================
99 //=============================================================================
101 StdMeshers_MEFISTO_2D::~StdMeshers_MEFISTO_2D()
103 MESSAGE("StdMeshers_MEFISTO_2D::~StdMeshers_MEFISTO_2D");
106 //=============================================================================
110 //=============================================================================
112 bool StdMeshers_MEFISTO_2D::CheckHypothesis
114 const TopoDS_Shape& aShape,
115 SMESH_Hypothesis::Hypothesis_Status& aStatus)
117 _hypMaxElementArea = NULL;
118 _hypLengthFromEdges = NULL;
122 list <const SMESHDS_Hypothesis * >::const_iterator itl;
123 const SMESHDS_Hypothesis *theHyp;
125 const list <const SMESHDS_Hypothesis * >&hyps = GetUsedHypothesis(aMesh, aShape);
126 int nbHyp = hyps.size();
129 aStatus = SMESH_Hypothesis::HYP_OK; //SMESH_Hypothesis::HYP_MISSING;
130 return true; // (PAL13464) can work with no hypothesis, LengthFromEdges is default one
134 theHyp = (*itl); // use only the first hypothesis
136 string hypName = theHyp->GetName();
140 if (hypName == "MaxElementArea")
142 _hypMaxElementArea = static_cast<const StdMeshers_MaxElementArea *>(theHyp);
143 ASSERT(_hypMaxElementArea);
144 _maxElementArea = _hypMaxElementArea->GetMaxArea();
146 aStatus = SMESH_Hypothesis::HYP_OK;
149 else if (hypName == "LengthFromEdges")
151 _hypLengthFromEdges = static_cast<const StdMeshers_LengthFromEdges *>(theHyp);
152 ASSERT(_hypLengthFromEdges);
154 aStatus = SMESH_Hypothesis::HYP_OK;
157 aStatus = SMESH_Hypothesis::HYP_INCOMPATIBLE;
162 if (_maxElementArea > 0)
164 //_edgeLength = 2 * sqrt(_maxElementArea); // triangles : minorant
165 _edgeLength = sqrt(2. * _maxElementArea/sqrt(3.0));
169 isOk = (_hypLengthFromEdges != NULL); // **** check mode
171 aStatus = SMESH_Hypothesis::HYP_BAD_PARAMETER;
177 //=============================================================================
181 //=============================================================================
183 bool StdMeshers_MEFISTO_2D::Compute(SMESH_Mesh & aMesh, const TopoDS_Shape & aShape)
185 MESSAGE("StdMeshers_MEFISTO_2D::Compute");
187 TopoDS_Face F = TopoDS::Face(aShape.Oriented(TopAbs_FORWARD));
189 // helper builds quadratic mesh if necessary
190 SMESH_MesherHelper helper(aMesh);
192 _quadraticMesh = myTool->IsQuadraticSubMesh(aShape);
193 const bool ignoreMediumNodes = _quadraticMesh;
195 // get all edges of a face
197 TWireVector wires = StdMeshers_FaceSide::GetFaceWires( F, aMesh, ignoreMediumNodes, problem );
198 int nbWires = wires.size();
199 if ( problem && !problem->IsOK() ) return error( problem );
200 if ( nbWires == 0 ) return error( "Problem in StdMeshers_FaceSide::GetFaceWires()");
201 if ( wires[0]->NbSegments() < 3 ) // ex: a circle with 2 segments
202 return error(COMPERR_BAD_INPUT_MESH,
203 SMESH_Comment("Too few segments: ")<<wires[0]->NbSegments());
205 // compute average edge length
206 if (!_hypMaxElementArea)
210 for ( int iW = 0; iW < nbWires; ++iW )
212 StdMeshers_FaceSidePtr wire = wires[ iW ];
213 _edgeLength += wire->Length();
214 nbSegments += wire->NbSegments();
217 _edgeLength /= nbSegments;
220 if (/*_hypLengthFromEdges &&*/ _edgeLength < DBL_MIN )
223 Z nblf; //nombre de lignes fermees (enveloppe en tete)
224 Z *nudslf = NULL; //numero du dernier sommet de chaque ligne fermee
226 Z nbpti = 0; //nombre points internes futurs sommets de la triangulation
235 Z nutysu = 1; // 1: il existe un fonction areteideale_()
236 // Z nutysu=0; // 0: on utilise aretmx
237 R aretmx = _edgeLength; // longueur max aretes future triangulation
241 nudslf = new Z[1 + nblf];
246 // count nb of input points
247 for ( int iW = 0; iW < nbWires; ++iW )
249 nbpnt += wires[iW]->NbPoints() - 1;
250 nudslf[iw++] = nbpnt;
253 uvslf = new R2[nudslf[nblf]];
255 double scalex, scaley;
256 ComputeScaleOnFace(aMesh, F, scalex, scaley);
258 // correspondence mefisto index --> Nodes
259 vector< const SMDS_MeshNode*> mefistoToDS(nbpnt, (const SMDS_MeshNode*)0);
263 // fill input points UV
264 if ( LoadPoints(wires, uvslf, mefistoToDS, scalex, scaley) )
267 aptrte(nutysu, aretmx,
268 nblf, nudslf, uvslf, nbpti, uvpti, nbst, uvst, nbt, nust, ierr);
272 MESSAGE("... End Triangulation Generated Triangle Number " << nbt);
273 MESSAGE(" Node Number " << nbst);
274 StoreResult(nbst, uvst, nbt, nust, mefistoToDS, scalex, scaley);
279 error(ierr,"Error in Triangulation (aptrte())");
282 if (nudslf != NULL) delete[]nudslf;
283 if (uvslf != NULL) delete[]uvslf;
284 if (uvst != NULL) delete[]uvst;
285 if (nust != NULL) delete[]nust;
291 //=============================================================================
295 //=============================================================================
297 bool StdMeshers_MEFISTO_2D::Evaluate(SMESH_Mesh & aMesh,
298 const TopoDS_Shape & aShape,
299 MapShapeNbElems& aResMap)
301 MESSAGE("StdMeshers_MEFISTO_2D::Evaluate");
303 TopoDS_Face F = TopoDS::Face(aShape.Oriented(TopAbs_FORWARD));
307 bool IsQuadratic = false;
309 TopExp_Explorer exp(F,TopAbs_EDGE);
310 for(; exp.More(); exp.Next()) {
311 TopoDS_Edge E = TopoDS::Edge(exp.Current());
312 MapShapeNbElemsItr anIt = aResMap.find( aMesh.GetSubMesh(E) );
313 if( anIt == aResMap.end() ) continue;
314 std::vector<int> aVec = (*anIt).second;
315 int nbe = Max(aVec[SMDSEntity_Edge],aVec[SMDSEntity_Quad_Edge]);
318 IsQuadratic = ( aVec[SMDSEntity_Quad_Edge] > aVec[SMDSEntity_Edge] );
323 Handle(Geom_Curve) C = BRep_Tool::Curve(E,L,a,b);
326 double dp = (b-a)/nbe;
327 for(int i=1; i<=nbe; i++) {
330 aLen += P1.Distance(P2);
334 aLen = aLen/NbSeg; // middle length
336 _edgeLength = DBL_MAX;
337 double tmpLength = Min( _edgeLength, aLen );
340 BRepGProp::SurfaceProperties(aShape,G);
341 double anArea = G.Mass();
343 int nbFaces = (int) ( anArea/(tmpLength*tmpLength*sqrt(3.)/4) );
344 int nbNodes = (int) ( nbFaces*3 - (NbSeg-1)*2 ) / 6;
346 std::vector<int> aVec(SMDSEntity_Last);
347 for(int i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i] = 0;
349 aVec[SMDSEntity_Quad_Triangle] = nbFaces;
350 aVec[SMDSEntity_Node] = (int)( nbNodes + nbFaces*3 - (NbSeg-1) );
353 aVec[SMDSEntity_Node] = nbNodes;
354 aVec[SMDSEntity_Triangle] = nbFaces;
356 SMESH_subMesh * sm = aMesh.GetSubMesh(aShape);
357 aResMap.insert(std::make_pair(sm,aVec));
363 //=======================================================================
364 //function : fixOverlappedLinkUV
365 //purpose : prevent failure due to overlapped adjacent links
366 //=======================================================================
368 static bool fixOverlappedLinkUV( R2& uv0, const R2& uv1, const R2& uv2 )
370 gp_XY v1( uv0.x - uv1.x, uv0.y - uv1.y );
371 gp_XY v2( uv2.x - uv1.x, uv2.y - uv1.y );
373 double tol2 = DBL_MIN * DBL_MIN;
374 double sqMod1 = v1.SquareModulus();
375 if ( sqMod1 <= tol2 ) return false;
376 double sqMod2 = v2.SquareModulus();
377 if ( sqMod2 <= tol2 ) return false;
381 // check sinus >= 1.e-3
382 const double minSin = 1.e-3;
383 if ( dot > 0 && 1 - dot * dot / ( sqMod1 * sqMod2 ) < minSin * minSin ) {
384 MESSAGE(" ___ FIX UV ____" << uv0.x << " " << uv0.y);
385 v1.SetCoord( -v1.Y(), v1.X() );
386 double delta = sqrt( sqMod1 ) * minSin;
396 // MESSAGE(" -> " << uv0.x << " " << uv0.y << " ");
397 // MESSAGE("v1( " << v1.X() << " " << v1.Y() << " ) " <<
398 // "v2( " << v2.X() << " " << v2.Y() << " ) ");
399 // MESSAGE("SIN: " << sqrt(1 - dot * dot / (sqMod1 * sqMod2)));
400 // v1.SetCoord( uv0.x - uv1.x, uv0.y - uv1.y );
401 // v2.SetCoord( uv2.x - uv1.x, uv2.y - uv1.y );
402 // gp_XY v3( uv2.x - uv0.x, uv2.y - uv0.y );
403 // sqMod1 = v1.SquareModulus();
404 // sqMod2 = v2.SquareModulus();
406 // double sin = sqrt(1 - dot * dot / (sqMod1 * sqMod2));
407 // MESSAGE("NEW SIN: " << sin);
414 //=======================================================================
415 //function : fixCommonVertexUV
417 //=======================================================================
419 static bool fixCommonVertexUV (R2 & theUV,
420 const TopoDS_Vertex& theV,
421 const TopoDS_Face& theF,
422 const TopTools_IndexedDataMapOfShapeListOfShape & theVWMap,
423 SMESH_Mesh & theMesh,
424 const double theScaleX,
425 const double theScaleY,
426 const bool theCreateQuadratic)
428 if( !theVWMap.Contains( theV )) return false;
430 // check if there is another wire sharing theV
431 const TopTools_ListOfShape& WList = theVWMap.FindFromKey( theV );
432 TopTools_ListIteratorOfListOfShape aWIt;
433 TopTools_MapOfShape aWires;
434 for ( aWIt.Initialize( WList ); aWIt.More(); aWIt.Next() )
435 aWires.Add( aWIt.Value() );
436 if ( aWires.Extent() < 2 ) return false;
438 TopoDS_Shape anOuterWire = BRepTools::OuterWire(theF);
439 TopoDS_Shape anInnerWire;
440 for ( aWIt.Initialize( WList ); aWIt.More() && anInnerWire.IsNull(); aWIt.Next() )
441 if ( !anOuterWire.IsSame( aWIt.Value() ))
442 anInnerWire = aWIt.Value();
444 TopTools_ListOfShape EList;
445 list< double > UList;
447 // find edges of theW sharing theV
448 // and find 2d normal to them at theV
450 TopoDS_Iterator itE( anInnerWire );
451 for ( ; itE.More(); itE.Next() )
453 const TopoDS_Edge& E = TopoDS::Edge( itE.Value() );
454 TopoDS_Iterator itV( E );
455 for ( ; itV.More(); itV.Next() )
457 const TopoDS_Vertex & V = TopoDS::Vertex( itV.Value() );
458 if ( !V.IsSame( theV ))
461 Standard_Real u = BRep_Tool::Parameter( V, E );
462 UList.push_back( u );
464 Handle(Geom2d_Curve) C2d = BRep_Tool::CurveOnSurface(E, theF, f, l);
468 gp_Vec2d n( d1.Y() * theScaleX, -d1.X() * theScaleY);
469 if ( E.Orientation() == TopAbs_REVERSED )
475 // define step size by which to move theUV
477 gp_Pnt2d nextUV; // uv of next node on edge, most distant of the four
478 gp_Pnt2d thisUV( theUV.x, theUV.y );
479 double maxDist = -DBL_MAX;
480 TopTools_ListIteratorOfListOfShape aEIt (EList);
481 list< double >::iterator aUIt = UList.begin();
482 for ( ; aEIt.More(); aEIt.Next(), aUIt++ )
484 const TopoDS_Edge& E = TopoDS::Edge( aEIt.Value() );
486 Handle(Geom2d_Curve) C2d = BRep_Tool::CurveOnSurface(E, theF, f, l);
488 double umin = DBL_MAX, umax = -DBL_MAX;
489 SMDS_NodeIteratorPtr nIt = theMesh.GetSubMesh(E)->GetSubMeshDS()->GetNodes();
490 if ( !nIt->more() ) // no nodes on edge, only on vertices
496 while ( nIt->more() ) {
497 const SMDS_MeshNode* node = nIt->next();
498 // check if node is medium
499 if ( theCreateQuadratic && SMESH_MesherHelper::IsMedium( node, SMDSAbs_Edge ))
501 const SMDS_EdgePosition* epos =
502 static_cast<const SMDS_EdgePosition*>(node->GetPosition().get());
503 double u = epos->GetUParameter();
510 bool isFirstCommon = ( *aUIt == f );
511 gp_Pnt2d uv = C2d->Value( isFirstCommon ? umin : umax );
512 double dist = thisUV.SquareDistance( uv );
513 if ( dist > maxDist ) {
519 uv0.x = thisUV.X(); uv0.y = thisUV.Y();
520 uv1.x = nextUV.X(); uv1.y = nextUV.Y();
521 uv2.x = thisUV.X(); uv2.y = thisUV.Y();
523 uv1.x *= theScaleX; uv1.y *= theScaleY;
525 if ( fixOverlappedLinkUV( uv0, uv1, uv2 ))
527 double step = thisUV.Distance( gp_Pnt2d( uv0.x, uv0.y ));
529 // move theUV along the normal by the step
533 MESSAGE("--fixCommonVertexUV move(" << theUV.x << " " << theUV.x
534 << ") by (" << N.X() << " " << N.Y() << ")"
535 << endl << "--- MAX DIST " << maxDist);
545 //=============================================================================
549 //=============================================================================
551 bool StdMeshers_MEFISTO_2D::LoadPoints(TWireVector & wires,
553 vector<const SMDS_MeshNode*>& mefistoToDS,
557 // to avoid passing same uv points for a vertex common to 2 wires
559 TopTools_IndexedDataMapOfShapeListOfShape VWMap;
560 if ( wires.size() > 1 )
562 F = TopoDS::Face( myTool->GetSubShape() );
563 TopExp::MapShapesAndAncestors( F, TopAbs_VERTEX, TopAbs_WIRE, VWMap );
565 for ( int iW = 0; iW < wires.size(); ++iW )
566 nbVertices += wires[ iW ]->NbEdges();
567 if ( nbVertices == VWMap.Extent() )
568 VWMap.Clear(); // wires have no common vertices
573 for ( int iW = 0; iW < wires.size(); ++iW )
575 const vector<UVPtStruct>& uvPtVec = wires[ iW ]->GetUVPtStruct();
576 if ( uvPtVec.size() != wires[ iW ]->NbPoints() ) {
577 return error(COMPERR_BAD_INPUT_MESH,SMESH_Comment("Unexpected nb of points on wire ")
578 << iW << ": " << uvPtVec.size()<<" != "<<wires[ iW ]->NbPoints()
579 << ", probably because of invalid node parameters on geom edges");
581 if ( m + uvPtVec.size()-1 > mefistoToDS.size() ) {
582 MESSAGE("Wrong mefistoToDS.size: "<<mefistoToDS.size()<<" < "<<m + uvPtVec.size()-1);
583 return error("Internal error");
586 list< int > mOnVertex;
587 vector<UVPtStruct>::const_iterator uvPt = uvPtVec.begin();
588 for ( ++uvPt; uvPt != uvPtVec.end(); ++uvPt )
590 // bind mefisto ID to node
591 mefistoToDS[m] = uvPt->node;
593 uvslf[m].x = uvPt->u * scalex;
594 uvslf[m].y = uvPt->v * scaley;
595 if ( uvPt->node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_VERTEX )
596 mOnVertex.push_back( m );
600 int mFirst = mOnVertex.front(), mLast = m - 1;
601 list< int >::iterator mIt = mOnVertex.begin();
602 for ( ; mIt != mOnVertex.end(); ++mIt)
605 if ( iW && !VWMap.IsEmpty()) { // except outer wire
606 // avoid passing same uv point for a vertex common to 2 wires
607 int vID = mefistoToDS[m]->GetPosition()->GetShapeId();
608 TopoDS_Vertex V = TopoDS::Vertex( myTool->GetMeshDS()->IndexToShape( vID ));
609 if ( fixCommonVertexUV( uvslf[m], V, F, VWMap, *myTool->GetMesh(),
610 scalex, scaley, _quadraticMesh )) {
611 myNodesOnCommonV.push_back( mefistoToDS[m] );
615 // prevent failure on overlapped adjacent links,
616 // check only links ending in vertex nodes
617 int mB = m - 1, mA = m + 1; // indices Before and After
618 if ( mB < mFirst ) mB = mLast;
619 if ( mA > mLast ) mA = mFirst;
620 fixOverlappedLinkUV (uvslf[ mB ], uvslf[ m ], uvslf[ mA ]);
627 //=============================================================================
631 //=============================================================================
633 void StdMeshers_MEFISTO_2D::ComputeScaleOnFace(SMESH_Mesh & aMesh,
634 const TopoDS_Face & aFace,
638 TopoDS_Wire W = BRepTools::OuterWire(aFace);
640 double xmin = 1.e300; // min & max of face 2D parametric coord.
641 double xmax = -1.e300;
642 double ymin = 1.e300;
643 double ymax = -1.e300;
648 TopExp_Explorer wexp(W, TopAbs_EDGE);
649 for ( ; wexp.More(); wexp.Next())
651 const TopoDS_Edge & E = TopoDS::Edge( wexp.Current() );
653 Handle(Geom2d_Curve) C2d = BRep_Tool::CurveOnSurface(E, aFace, f, l);
654 if ( C2d.IsNull() ) continue;
655 double du = (l - f) / double (nbp);
656 for (int i = 0; i <= nbp; i++)
658 double param = f + double (i) * du;
659 gp_Pnt2d p = C2d->Value(param);
668 // MESSAGE(" "<< f<<" "<<l<<" "<<param<<" "<<xmin<<" "<<xmax<<" "<<ymin<<" "<<ymax);
675 double xmoy = (xmax + xmin) / 2.;
676 double ymoy = (ymax + ymin) / 2.;
677 double xsize = xmax - xmin;
678 double ysize = ymax - ymin;
681 Handle(Geom_Surface) S = BRep_Tool::Surface(aFace,L); // 3D surface
685 gp_Pnt PX0 = S->Value(xmin, ymoy);
686 gp_Pnt PY0 = S->Value(xmoy, ymin);
687 double dx = xsize / double (nbp);
688 double dy = ysize / double (nbp);
689 for (int i = 1; i <= nbp; i++)
691 double x = xmin + double (i) * dx;
692 gp_Pnt PX = S->Value(x, ymoy);
693 double y = ymin + double (i) * dy;
694 gp_Pnt PY = S->Value(xmoy, y);
695 length_x += PX.Distance(PX0);
696 length_y += PY.Distance(PY0);
700 scalex = length_x / xsize;
701 scaley = length_y / ysize;
704 double xyratio = xsize*scalex/(ysize*scaley);
705 const double maxratio = 1.e2;
707 if (xyratio > maxratio) {
709 scaley *= xyratio / maxratio;
712 else if (xyratio < 1./maxratio) {
714 scalex *= 1 / xyratio / maxratio;
721 //=============================================================================
725 //=============================================================================
727 void StdMeshers_MEFISTO_2D::StoreResult(Z nbst, R2 * uvst, Z nbt, Z * nust,
728 vector< const SMDS_MeshNode*>&mefistoToDS,
729 double scalex, double scaley)
731 SMESHDS_Mesh * meshDS = myTool->GetMeshDS();
732 int faceID = myTool->GetSubShapeID();
734 TopoDS_Face F = TopoDS::Face( myTool->GetSubShape() );
735 Handle(Geom_Surface) S = BRep_Tool::Surface( F );
737 Z n = mefistoToDS.size(); // nb input points
738 mefistoToDS.resize( nbst );
739 for ( ; n < nbst; n++)
743 double u = uvst[n][0] / scalex;
744 double v = uvst[n][1] / scaley;
745 gp_Pnt P = S->Value(u, v);
747 SMDS_MeshNode * node = meshDS->AddNode(P.X(), P.Y(), P.Z());
748 meshDS->SetNodeOnFace(node, faceID, u, v);
750 //MESSAGE(P.X()<<" "<<P.Y()<<" "<<P.Z());
751 mefistoToDS[n] = node;
752 //MESSAGE("NEW: "<<n<<" "<<mefistoToDS[n+1]);
758 // triangle points must be in trigonometric order if face is Forward
759 // else they must be put clockwise
761 bool triangleIsWellOriented = ( F.Orientation() == TopAbs_FORWARD );
763 for (n = 1; n <= nbt; n++)
765 const SMDS_MeshNode * n1 = mefistoToDS[ nust[m++] - 1 ];
766 const SMDS_MeshNode * n2 = mefistoToDS[ nust[m++] - 1 ];
767 const SMDS_MeshNode * n3 = mefistoToDS[ nust[m++] - 1 ];
769 SMDS_MeshElement * elt;
770 if (triangleIsWellOriented)
771 elt = myTool->AddFace(n1, n2, n3);
773 elt = myTool->AddFace(n1, n3, n2);
775 meshDS->SetMeshElementOnShape(elt, faceID);
779 // remove bad elements built on vertices shared by wires
781 list<const SMDS_MeshNode*>::iterator itN = myNodesOnCommonV.begin();
782 for ( ; itN != myNodesOnCommonV.end(); itN++ )
784 const SMDS_MeshNode* node = *itN;
785 SMDS_ElemIteratorPtr invElemIt = node->GetInverseElementIterator();
786 while ( invElemIt->more() )
788 const SMDS_MeshElement* elem = invElemIt->next();
789 SMDS_ElemIteratorPtr itN = elem->nodesIterator();
791 while ( itN->more() )
792 if ( itN->next() == node)
795 MESSAGE( "RM bad element " << elem->GetID());
796 meshDS->RemoveElement( elem );