1 // Copyright (C) 2007-2022 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, or (at your option) any later version.
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
23 //=============================================================================
24 // File : NETGENPlugin_NETGEN_3D.cxx
25 // Moved here from SMESH_NETGEN_3D.cxx
26 // Created : lundi 27 Janvier 2003
27 // Author : Nadir BOUHAMOU (CEA)
29 //=============================================================================
31 #include "NETGENPlugin_NETGEN_3D.hxx"
33 #include "NETGENPlugin_Hypothesis.hxx"
35 #include <SMDS_MeshElement.hxx>
36 #include <SMDS_MeshNode.hxx>
37 #include <SMESHDS_Mesh.hxx>
38 #include <SMESH_Comment.hxx>
39 #include <SMESH_ControlsDef.hxx>
40 #include <SMESH_Gen.hxx>
41 #include <SMESH_Mesh.hxx>
42 #include <SMESH_MeshEditor.hxx>
43 #include <SMESH_MesherHelper.hxx>
44 #include <SMESH_subMesh.hxx>
45 #include <StdMeshers_MaxElementVolume.hxx>
46 #include <StdMeshers_QuadToTriaAdaptor.hxx>
47 #include <StdMeshers_ViscousLayers.hxx>
48 #include <SMESH_subMesh.hxx>
51 #include <BRepGProp.hxx>
52 #include <BRep_Tool.hxx>
53 #include <GProp_GProps.hxx>
55 #include <TopExp_Explorer.hxx>
56 #include <TopTools_ListIteratorOfListOfShape.hxx>
59 #include <Standard_Failure.hxx>
60 #include <Standard_ErrorHandler.hxx>
62 #include <utilities.h>
77 #include <occgeom.hpp>
80 #include <ngexception.hpp>
83 #include <core/exception.hpp>
91 NETGENPLUGIN_DLL_HEADER
92 extern MeshingParameters mparam;
94 NETGENPLUGIN_DLL_HEADER
95 extern volatile multithreadt multithread;
97 using namespace nglib;
100 //=============================================================================
104 //=============================================================================
106 NETGENPlugin_NETGEN_3D::NETGENPlugin_NETGEN_3D(int hypId, SMESH_Gen* gen)
107 : SMESH_3D_Algo(hypId, gen)
110 _shapeType = (1 << TopAbs_SHELL) | (1 << TopAbs_SOLID);// 1 bit /shape type
111 _compatibleHypothesis.push_back("MaxElementVolume");
112 _compatibleHypothesis.push_back("NETGEN_Parameters");
113 _compatibleHypothesis.push_back("ViscousLayers");
115 _maxElementVolume = 0.;
117 _hypMaxElementVolume = NULL;
118 _hypParameters = NULL;
119 _viscousLayersHyp = NULL;
121 _requireShape = false; // can work without shape
124 //=============================================================================
128 //=============================================================================
130 NETGENPlugin_NETGEN_3D::~NETGENPlugin_NETGEN_3D()
134 //=============================================================================
138 //=============================================================================
140 bool NETGENPlugin_NETGEN_3D::CheckHypothesis (SMESH_Mesh& aMesh,
141 const TopoDS_Shape& aShape,
142 Hypothesis_Status& aStatus)
144 _hypMaxElementVolume = NULL;
145 _hypParameters = NULL;
146 _viscousLayersHyp = NULL;
147 _maxElementVolume = DBL_MAX;
149 // for correct work of GetProgress():
150 //netgen::multithread.percent = 0.;
151 //netgen::multithread.task = "Volume meshing";
152 _progressByTic = -1.;
154 list<const SMESHDS_Hypothesis*>::const_iterator itl;
155 //const SMESHDS_Hypothesis* theHyp;
157 const list<const SMESHDS_Hypothesis*>& hyps =
158 GetUsedHypothesis(aMesh, aShape, /*ignoreAuxiliary=*/false);
159 list <const SMESHDS_Hypothesis* >::const_iterator h = hyps.begin();
160 if ( h == hyps.end())
162 aStatus = SMESH_Hypothesis::HYP_OK;
163 return true; // can work with no hypothesis
167 for ( ; h != hyps.end(); ++h )
169 if ( !_hypMaxElementVolume )
170 _hypMaxElementVolume = dynamic_cast< const StdMeshers_MaxElementVolume*> ( *h );
171 if ( !_viscousLayersHyp ) // several _viscousLayersHyp's allowed
172 _viscousLayersHyp = dynamic_cast< const StdMeshers_ViscousLayers*> ( *h );
173 if ( ! _hypParameters )
174 _hypParameters = dynamic_cast< const NETGENPlugin_Hypothesis*> ( *h );
176 if ( *h != _hypMaxElementVolume &&
177 *h != _viscousLayersHyp &&
178 *h != _hypParameters &&
179 !dynamic_cast< const StdMeshers_ViscousLayers*>(*h)) // several VL hyps allowed
180 aStatus = HYP_INCOMPATIBLE;
182 if ( _hypMaxElementVolume && _hypParameters )
183 aStatus = HYP_INCOMPATIBLE;
184 else if ( aStatus == HYP_OK && _viscousLayersHyp )
185 error( _viscousLayersHyp->CheckHypothesis( aMesh, aShape, aStatus ));
187 if ( _hypMaxElementVolume )
188 _maxElementVolume = _hypMaxElementVolume->GetMaxVolume();
190 return aStatus == HYP_OK;
195 //=============================================================================
197 *Here we are going to use the NETGEN mesher
199 //=============================================================================
202 * @brief Get an iterator on the Surface element with their orientation
206 bool NETGENPlugin_NETGEN_3D::getSurfaceElements(
208 const TopoDS_Shape& aShape,
209 SMESH_ProxyMesh::Ptr proxyMesh,
210 NETGENPlugin_Internals &internals,
211 SMESH_MesherHelper &helper,
212 std::map<const SMDS_MeshElement*, tuple<bool, bool>>& listElements
215 SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
216 TopAbs_ShapeEnum mainType = aMesh.GetShapeToMesh().ShapeType();
217 bool checkReverse = ( mainType == TopAbs_COMPOUND || mainType == TopAbs_COMPSOLID );
219 for ( TopExp_Explorer exFa( aShape, TopAbs_FACE ); exFa.More(); exFa.Next())
221 const TopoDS_Shape& aShapeFace = exFa.Current();
222 int faceID = meshDS->ShapeToIndex( aShapeFace );
223 bool isInternalFace = internals.isInternalShape( faceID );
225 if ( checkReverse && !isInternalFace &&
226 helper.NbAncestors(aShapeFace, aMesh, aShape.ShapeType()) > 1 )
227 // IsReversedSubMesh() can work wrong on strongly curved faces,
228 // so we use it as less as possible
229 isRev = helper.IsReversedSubMesh( TopoDS::Face( aShapeFace ));
231 const SMESHDS_SubMesh * aSubMeshDSFace = proxyMesh->GetSubMesh( aShapeFace );
232 if ( !aSubMeshDSFace ) continue;
234 SMDS_ElemIteratorPtr iteratorElem = aSubMeshDSFace->GetElements();
235 if ( _quadraticMesh &&
236 dynamic_cast< const SMESH_ProxyMesh::SubMesh*>( aSubMeshDSFace ))
238 // add medium nodes of proxy triangles to helper (#16843)
239 while ( iteratorElem->more() )
240 helper.AddTLinks( static_cast< const SMDS_MeshFace* >( iteratorElem->next() ));
242 iteratorElem = aSubMeshDSFace->GetElements();
244 while(iteratorElem->more()){
245 const SMDS_MeshElement* elem = iteratorElem->next();
248 return error( COMPERR_BAD_INPUT_MESH, "Null element encounters");
250 if ( elem->NbCornerNodes() != 3 ){
251 return error( COMPERR_BAD_INPUT_MESH, "Not triangle element encounters");
253 listElements[elem] = tuple(isRev, isInternalFace);
261 bool NETGENPlugin_NETGEN_3D::computeFillNgMesh(
263 const TopoDS_Shape& aShape,
264 vector< const SMDS_MeshNode* > &nodeVec,
265 NETGENPlugin_NetgenLibWrapper &ngLib,
266 SMESH_MesherHelper &helper,
267 int &Netgen_NbOfNodes)
269 netgen::multithread.terminate = 0;
270 netgen::multithread.task = "Volume meshing";
271 _progressByTic = -1.;
273 SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
275 _quadraticMesh = helper.IsQuadraticSubMesh(aShape);
276 helper.SetElementsOnShape( true );
278 Netgen_NbOfNodes = 0;
279 double Netgen_point[3];
280 int Netgen_triangle[3];
282 Ng_Mesh * Netgen_mesh = (Ng_Mesh*)ngLib._ngMesh;
285 const int invalid_ID = -1;
287 SMESH::Controls::Area areaControl;
288 SMESH::Controls::TSequenceOfXYZ nodesCoords;
290 // maps nodes to ng ID
291 typedef map< const SMDS_MeshNode*, int, TIDCompare > TNodeToIDMap;
292 typedef TNodeToIDMap::value_type TN2ID;
293 TNodeToIDMap nodeToNetgenID;
295 // find internal shapes
296 NETGENPlugin_Internals internals( aMesh, aShape, /*is3D=*/true );
298 // ---------------------------------
299 // Feed the Netgen with surface mesh
300 // ---------------------------------
302 bool isInternalFace=false;
304 SMESH_ProxyMesh::Ptr proxyMesh( new SMESH_ProxyMesh( aMesh ));
305 if ( _viscousLayersHyp )
307 netgen::multithread.percent = 3;
308 proxyMesh = _viscousLayersHyp->Compute( aMesh, aShape );
312 if ( aMesh.NbQuadrangles() > 0 )
314 netgen::multithread.percent = 6;
315 StdMeshers_QuadToTriaAdaptor* Adaptor = new StdMeshers_QuadToTriaAdaptor;
316 Adaptor->Compute(aMesh,aShape,proxyMesh.get());
317 proxyMesh.reset( Adaptor );
320 std::map<const SMDS_MeshElement*, tuple<bool, bool>> listElements;
321 bool ret = getSurfaceElements(aMesh, aShape, proxyMesh, internals, helper, listElements);
325 for ( auto const& [elem, info] : listElements ) // loop on elements on a geom face
327 isRev = get<0>(info);
328 isInternalFace = get<1>(info);
329 // Add nodes of triangles and triangles them-selves to netgen mesh
331 // add three nodes of triangle
332 bool hasDegen = false;
333 for ( int iN = 0; iN < 3; ++iN )
335 const SMDS_MeshNode* node = elem->GetNode( iN );
336 const int shapeID = node->getshapeId();
337 if ( node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_EDGE &&
338 helper.IsDegenShape( shapeID ))
340 // ignore all nodes on degeneraged edge and use node on its vertex instead
341 TopoDS_Shape vertex = TopoDS_Iterator( meshDS->IndexToShape( shapeID )).Value();
342 node = SMESH_Algo::VertexNode( TopoDS::Vertex( vertex ), meshDS );
345 int& ngID = nodeToNetgenID.insert(TN2ID( node, invalid_ID )).first->second;
346 if ( ngID == invalid_ID )
348 ngID = ++Netgen_NbOfNodes;
349 Netgen_point [ 0 ] = node->X();
350 Netgen_point [ 1 ] = node->Y();
351 Netgen_point [ 2 ] = node->Z();
352 Ng_AddPoint(Netgen_mesh, Netgen_point);
354 Netgen_triangle[ isRev ? 2-iN : iN ] = ngID;
357 if ( hasDegen && (Netgen_triangle[0] == Netgen_triangle[1] ||
358 Netgen_triangle[0] == Netgen_triangle[2] ||
359 Netgen_triangle[2] == Netgen_triangle[1] ))
362 Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
364 if ( isInternalFace && !proxyMesh->IsTemporary( elem ))
366 swap( Netgen_triangle[1], Netgen_triangle[2] );
367 Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
369 } // loop on elements on a face
371 // insert old nodes into nodeVec
372 nodeVec.resize( nodeToNetgenID.size() + 1, 0 );
373 TNodeToIDMap::iterator n_id = nodeToNetgenID.begin();
374 for ( ; n_id != nodeToNetgenID.end(); ++n_id )
375 nodeVec[ n_id->second ] = n_id->first;
376 nodeToNetgenID.clear();
378 if ( internals.hasInternalVertexInSolid() )
380 netgen::OCCGeometry occgeo;
381 NETGENPlugin_Mesher::AddIntVerticesInSolids( occgeo,
382 (netgen::Mesh&) *Netgen_mesh,
387 Netgen_NbOfNodes = Ng_GetNP( Netgen_mesh );
391 bool NETGENPlugin_NETGEN_3D::computePrepareParam(
393 NETGENPlugin_NetgenLibWrapper &ngLib,
394 netgen::OCCGeometry &occgeo,
395 SMESH_MesherHelper &helper,
399 netgen::multithread.terminate = 0;
401 netgen::Mesh* ngMesh = ngLib._ngMesh;
403 NETGENPlugin_Mesher aMesher( &aMesh, helper.GetSubShape(), /*isVolume=*/true );
406 if ( _hypParameters )
408 aMesher.SetParameters( _hypParameters );
410 if ( !_hypParameters->GetLocalSizesAndEntries().empty() ||
411 !_hypParameters->GetMeshSizeFile().empty() )
413 if ( ! &ngMesh->LocalHFunction() )
415 netgen::Point3d pmin, pmax;
416 ngMesh->GetBox( pmin, pmax, 0 );
417 ngMesh->SetLocalH( pmin, pmax, _hypParameters->GetGrowthRate() );
419 aMesher.SetLocalSize( occgeo, *ngMesh );
422 ngMesh->LoadLocalMeshSize( netgen::mparam.meshsizefilename );
423 } catch (netgen::NgException & ex) {
424 return error( COMPERR_BAD_PARMETERS, ex.What() );
427 if ( !_hypParameters->GetOptimize() )
428 endWith = netgen::MESHCONST_MESHVOLUME;
430 else if ( _hypMaxElementVolume )
432 netgen::mparam.maxh = pow( 72, 1/6. ) * pow( _maxElementVolume, 1/3. );
433 // limitVolumeSize( ngMesh, mparam.maxh ); // result is unpredictable
435 else if ( aMesh.HasShapeToMesh() )
437 aMesher.PrepareOCCgeometry( occgeo, helper.GetSubShape(), aMesh );
438 netgen::mparam.maxh = occgeo.GetBoundingBox().Diam()/2;
442 netgen::Point3d pmin, pmax;
443 ngMesh->GetBox (pmin, pmax);
444 netgen::mparam.maxh = Dist(pmin, pmax)/2;
447 if ( !_hypParameters && aMesh.HasShapeToMesh() )
449 netgen::mparam.minh = aMesher.GetDefaultMinSize( helper.GetSubShape(), netgen::mparam.maxh );
454 bool NETGENPlugin_NETGEN_3D::computeRunMesher(
455 netgen::OCCGeometry &occgeo,
456 vector< const SMDS_MeshNode* > &nodeVec,
457 netgen::Mesh* ngMesh,
458 NETGENPlugin_NetgenLibWrapper &ngLib,
459 int &startWith, int &endWith)
467 ngLib.CalcLocalH(ngMesh);
468 err = ngLib.GenerateMesh(occgeo, startWith, endWith);
470 if(netgen::multithread.terminate)
473 error(SMESH_Comment("Error in netgen::OCCGenerateMesh() at ") << netgen::multithread.task);
476 catch (Standard_Failure& ex)
478 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
479 str << " at " << netgen::multithread.task
480 << ": " << ex.DynamicType()->Name();
481 if ( ex.GetMessageString() && strlen( ex.GetMessageString() ))
482 str << ": " << ex.GetMessageString();
485 catch (netgen::NgException& exc)
487 SMESH_Comment str("NgException");
488 if ( strlen( netgen::multithread.task ) > 0 )
489 str << " at " << netgen::multithread.task;
490 str << ": " << exc.What();
495 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
496 if ( strlen( netgen::multithread.task ) > 0 )
497 str << " at " << netgen::multithread.task;
503 SMESH_ComputeErrorPtr ce = NETGENPlugin_Mesher::ReadErrors(nodeVec);
504 if ( ce && ce->HasBadElems() ){
512 bool NETGENPlugin_NETGEN_3D::computeFillMesh(
513 vector< const SMDS_MeshNode* > &nodeVec,
514 NETGENPlugin_NetgenLibWrapper &ngLib,
515 SMESH_MesherHelper &helper,
516 int &Netgen_NbOfNodes
519 Ng_Mesh* Netgen_mesh = ngLib.ngMesh();
521 int Netgen_NbOfNodesNew = Ng_GetNP(Netgen_mesh);
522 int Netgen_NbOfTetra = Ng_GetNE(Netgen_mesh);
524 bool isOK = ( /*status == NG_OK &&*/ Netgen_NbOfTetra > 0 );// get whatever built
527 double Netgen_point[3];
528 int Netgen_tetrahedron[4];
530 // create and insert new nodes into nodeVec
531 nodeVec.resize( Netgen_NbOfNodesNew + 1, 0 );
532 int nodeIndex = Netgen_NbOfNodes + 1;
533 for ( ; nodeIndex <= Netgen_NbOfNodesNew; ++nodeIndex )
535 Ng_GetPoint( Netgen_mesh, nodeIndex, Netgen_point );
536 nodeVec.at(nodeIndex) = helper.AddNode(Netgen_point[0], Netgen_point[1], Netgen_point[2]);
539 // create tetrahedrons
540 for ( int elemIndex = 1; elemIndex <= Netgen_NbOfTetra; ++elemIndex )
542 Ng_GetVolumeElement(Netgen_mesh, elemIndex, Netgen_tetrahedron);
545 helper.AddVolume (nodeVec.at( Netgen_tetrahedron[0] ),
546 nodeVec.at( Netgen_tetrahedron[1] ),
547 nodeVec.at( Netgen_tetrahedron[2] ),
548 nodeVec.at( Netgen_tetrahedron[3] ));
558 bool NETGENPlugin_NETGEN_3D::Compute(
560 const TopoDS_Shape& aShape)
562 // vector of nodes in which node index == netgen ID
563 vector< const SMDS_MeshNode* > nodeVec;
564 NETGENPlugin_NetgenLibWrapper ngLib;
565 SMESH_MesherHelper helper(aMesh);
566 int startWith = netgen::MESHCONST_MESHVOLUME;
567 int endWith = netgen::MESHCONST_OPTVOLUME;
568 int Netgen_NbOfNodes;
570 computeFillNgMesh(aMesh, aShape, nodeVec, ngLib, helper, Netgen_NbOfNodes);
572 netgen::OCCGeometry occgeo;
573 computePrepareParam(aMesh, ngLib, occgeo, helper, endWith);
574 computeRunMesher(occgeo, nodeVec, ngLib._ngMesh, ngLib, startWith, endWith);
576 computeFillMesh(nodeVec, ngLib, helper, Netgen_NbOfNodes);
582 //================================================================================
584 * \brief set parameters and generate the volume mesh
586 //================================================================================
588 bool NETGENPlugin_NETGEN_3D::compute(SMESH_Mesh& aMesh,
589 SMESH_MesherHelper& helper,
590 vector< const SMDS_MeshNode* >& nodeVec,
591 NETGENPlugin_NetgenLibWrapper& ngLib)
593 netgen::multithread.terminate = 0;
595 netgen::Mesh* ngMesh = ngLib._ngMesh;
596 Ng_Mesh* Netgen_mesh = ngLib.ngMesh();
597 int Netgen_NbOfNodes = Ng_GetNP( Netgen_mesh );
599 int startWith = netgen::MESHCONST_MESHVOLUME;
600 int endWith = netgen::MESHCONST_OPTVOLUME;
603 NETGENPlugin_Mesher aMesher( &aMesh, helper.GetSubShape(), /*isVolume=*/true );
604 netgen::OCCGeometry occgeo;
606 if ( _hypParameters )
608 aMesher.SetParameters( _hypParameters );
610 if ( !_hypParameters->GetLocalSizesAndEntries().empty() ||
611 !_hypParameters->GetMeshSizeFile().empty() )
613 if ( ! &ngMesh->LocalHFunction() )
615 netgen::Point3d pmin, pmax;
616 ngMesh->GetBox( pmin, pmax, 0 );
617 ngMesh->SetLocalH( pmin, pmax, _hypParameters->GetGrowthRate() );
619 aMesher.SetLocalSize( occgeo, *ngMesh );
622 ngMesh->LoadLocalMeshSize( netgen::mparam.meshsizefilename );
623 } catch (netgen::NgException & ex) {
624 return error( COMPERR_BAD_PARMETERS, ex.What() );
627 if ( !_hypParameters->GetOptimize() )
628 endWith = netgen::MESHCONST_MESHVOLUME;
630 else if ( _hypMaxElementVolume )
632 netgen::mparam.maxh = pow( 72, 1/6. ) * pow( _maxElementVolume, 1/3. );
633 // limitVolumeSize( ngMesh, mparam.maxh ); // result is unpredictable
635 else if ( aMesh.HasShapeToMesh() )
637 aMesher.PrepareOCCgeometry( occgeo, helper.GetSubShape(), aMesh );
638 netgen::mparam.maxh = occgeo.GetBoundingBox().Diam()/2;
642 netgen::Point3d pmin, pmax;
643 ngMesh->GetBox (pmin, pmax);
644 netgen::mparam.maxh = Dist(pmin, pmax)/2;
647 if ( !_hypParameters && aMesh.HasShapeToMesh() )
649 netgen::mparam.minh = aMesher.GetDefaultMinSize( helper.GetSubShape(), netgen::mparam.maxh );
656 ngLib.CalcLocalH(ngMesh);
657 err = ngLib.GenerateMesh(occgeo, startWith, endWith);
659 if(netgen::multithread.terminate)
662 error(SMESH_Comment("Error in netgen::OCCGenerateMesh() at ") << netgen::multithread.task);
664 catch (Standard_Failure& ex)
666 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
667 str << " at " << netgen::multithread.task
668 << ": " << ex.DynamicType()->Name();
669 if ( ex.GetMessageString() && strlen( ex.GetMessageString() ))
670 str << ": " << ex.GetMessageString();
673 catch (netgen::NgException& exc)
675 SMESH_Comment str("NgException");
676 if ( strlen( netgen::multithread.task ) > 0 )
677 str << " at " << netgen::multithread.task;
678 str << ": " << exc.What();
683 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
684 if ( strlen( netgen::multithread.task ) > 0 )
685 str << " at " << netgen::multithread.task;
689 int Netgen_NbOfNodesNew = Ng_GetNP(Netgen_mesh);
690 int Netgen_NbOfTetra = Ng_GetNE(Netgen_mesh);
692 // -------------------------------------------------------------------
693 // Feed back the SMESHDS with the generated Nodes and Volume Elements
694 // -------------------------------------------------------------------
698 SMESH_ComputeErrorPtr ce = NETGENPlugin_Mesher::ReadErrors(nodeVec);
699 if ( ce && ce->HasBadElems() )
703 bool isOK = ( /*status == NG_OK &&*/ Netgen_NbOfTetra > 0 );// get whatever built
706 double Netgen_point[3];
707 int Netgen_tetrahedron[4];
709 // create and insert new nodes into nodeVec
710 nodeVec.resize( Netgen_NbOfNodesNew + 1, 0 );
711 int nodeIndex = Netgen_NbOfNodes + 1;
712 for ( ; nodeIndex <= Netgen_NbOfNodesNew; ++nodeIndex )
714 Ng_GetPoint( Netgen_mesh, nodeIndex, Netgen_point );
715 nodeVec.at(nodeIndex) = helper.AddNode(Netgen_point[0], Netgen_point[1], Netgen_point[2]);
718 // create tetrahedrons
719 for ( int elemIndex = 1; elemIndex <= Netgen_NbOfTetra; ++elemIndex )
721 Ng_GetVolumeElement(Netgen_mesh, elemIndex, Netgen_tetrahedron);
724 helper.AddVolume (nodeVec.at( Netgen_tetrahedron[0] ),
725 nodeVec.at( Netgen_tetrahedron[1] ),
726 nodeVec.at( Netgen_tetrahedron[2] ),
727 nodeVec.at( Netgen_tetrahedron[3] ));
738 //================================================================================
740 * \brief Compute tetrahedral mesh from 2D mesh without geometry
742 //================================================================================
744 bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh& aMesh,
745 SMESH_MesherHelper* aHelper)
747 const int invalid_ID = -1;
749 netgen::multithread.terminate = 0;
750 _progressByTic = -1.;
752 SMESH_MesherHelper::MType MeshType = aHelper->IsQuadraticMesh();
753 if ( MeshType == SMESH_MesherHelper::COMP )
754 return error( COMPERR_BAD_INPUT_MESH,
755 SMESH_Comment("Mesh with linear and quadratic elements given"));
757 aHelper->SetIsQuadratic( MeshType == SMESH_MesherHelper::QUADRATIC );
759 // ---------------------------------
760 // Feed the Netgen with surface mesh
761 // ---------------------------------
763 int Netgen_NbOfNodes = 0;
764 double Netgen_point[3];
765 int Netgen_triangle[3];
767 NETGENPlugin_NetgenLibWrapper ngLib;
768 Ng_Mesh * Netgen_mesh = ngLib.ngMesh();
770 SMESH_ProxyMesh::Ptr proxyMesh( new SMESH_ProxyMesh( aMesh ));
771 if ( aMesh.NbQuadrangles() > 0 )
773 StdMeshers_QuadToTriaAdaptor* Adaptor = new StdMeshers_QuadToTriaAdaptor;
774 Adaptor->Compute(aMesh);
775 proxyMesh.reset( Adaptor );
777 if ( aHelper->IsQuadraticMesh() )
779 SMDS_ElemIteratorPtr fIt = proxyMesh->GetFaces();
781 aHelper->AddTLinks( static_cast< const SMDS_MeshFace* >( fIt->next() ));
785 // maps nodes to ng ID
786 typedef map< const SMDS_MeshNode*, int, TIDCompare > TNodeToIDMap;
787 typedef TNodeToIDMap::value_type TN2ID;
788 TNodeToIDMap nodeToNetgenID;
790 SMDS_ElemIteratorPtr fIt = proxyMesh->GetFaces();
794 const SMDS_MeshElement* elem = fIt->next();
796 return error( COMPERR_BAD_INPUT_MESH, "Null element encounters");
797 if ( elem->NbCornerNodes() != 3 )
798 return error( COMPERR_BAD_INPUT_MESH, "Not triangle element encounters");
800 // add three nodes of triangle
801 for ( int iN = 0; iN < 3; ++iN )
803 const SMDS_MeshNode* node = elem->GetNode( iN );
804 int& ngID = nodeToNetgenID.insert(TN2ID( node, invalid_ID )).first->second;
805 if ( ngID == invalid_ID )
807 ngID = ++Netgen_NbOfNodes;
808 Netgen_point [ 0 ] = node->X();
809 Netgen_point [ 1 ] = node->Y();
810 Netgen_point [ 2 ] = node->Z();
811 Ng_AddPoint(Netgen_mesh, Netgen_point);
813 Netgen_triangle[ iN ] = ngID;
815 Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
817 proxyMesh.reset(); // delete tmp faces
819 // vector of nodes in which node index == netgen ID
820 vector< const SMDS_MeshNode* > nodeVec ( nodeToNetgenID.size() + 1 );
821 // insert old nodes into nodeVec
822 TNodeToIDMap::iterator n_id = nodeToNetgenID.begin();
823 for ( ; n_id != nodeToNetgenID.end(); ++n_id )
824 nodeVec.at( n_id->second ) = n_id->first;
825 nodeToNetgenID.clear();
827 // -------------------------
828 // Generate the volume mesh
829 // -------------------------
831 return ( ngLib._isComputeOk = compute( aMesh, *aHelper, nodeVec, ngLib ));
834 void NETGENPlugin_NETGEN_3D::CancelCompute()
836 SMESH_Algo::CancelCompute();
837 netgen::multithread.terminate = 1;
840 //================================================================================
842 * \brief Return Compute progress
844 //================================================================================
846 double NETGENPlugin_NETGEN_3D::GetProgress() const
849 const char* volMeshing = "Volume meshing";
850 const char* dlnMeshing = "Delaunay meshing";
851 const double meshingRatio = 0.15;
852 const_cast<NETGENPlugin_NETGEN_3D*>( this )->_progressTic++;
854 if ( _progressByTic < 0. &&
855 ( strncmp( netgen::multithread.task, dlnMeshing, 3 ) == 0 ||
856 strncmp( netgen::multithread.task, volMeshing, 3 ) == 0 ))
858 res = 0.001 + meshingRatio * netgen::multithread.percent / 100.;
860 else // different otimizations
862 if ( _progressByTic < 0. )
863 ((NETGENPlugin_NETGEN_3D*)this)->_progressByTic = meshingRatio / _progressTic;
864 res = _progressByTic * _progressTic;
866 return Min ( res, 0.98 );
869 //=============================================================================
873 //=============================================================================
875 bool NETGENPlugin_NETGEN_3D::Evaluate(SMESH_Mesh& aMesh,
876 const TopoDS_Shape& aShape,
877 MapShapeNbElems& aResMap)
879 smIdType nbtri = 0, nbqua = 0;
880 double fullArea = 0.0;
881 for (TopExp_Explorer expF(aShape, TopAbs_FACE); expF.More(); expF.Next()) {
882 TopoDS_Face F = TopoDS::Face( expF.Current() );
883 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
884 MapShapeNbElemsItr anIt = aResMap.find(sm);
885 if( anIt==aResMap.end() ) {
886 SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
887 smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,"Submesh can not be evaluated",this));
890 std::vector<smIdType> aVec = (*anIt).second;
891 nbtri += std::max(aVec[SMDSEntity_Triangle],aVec[SMDSEntity_Quad_Triangle]);
892 nbqua += std::max(aVec[SMDSEntity_Quadrangle],aVec[SMDSEntity_Quad_Quadrangle]);
894 BRepGProp::SurfaceProperties(F,G);
895 double anArea = G.Mass();
899 // collect info from edges
900 smIdType nb0d_e = 0, nb1d_e = 0;
901 bool IsQuadratic = false;
903 TopTools_MapOfShape tmpMap;
904 for (TopExp_Explorer expF(aShape, TopAbs_EDGE); expF.More(); expF.Next()) {
905 TopoDS_Edge E = TopoDS::Edge(expF.Current());
906 if( tmpMap.Contains(E) )
909 SMESH_subMesh *aSubMesh = aMesh.GetSubMesh(expF.Current());
910 MapShapeNbElemsItr anIt = aResMap.find(aSubMesh);
911 if( anIt==aResMap.end() ) {
912 SMESH_ComputeErrorPtr& smError = aSubMesh->GetComputeError();
913 smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,
914 "Submesh can not be evaluated",this));
917 std::vector<smIdType> aVec = (*anIt).second;
918 nb0d_e += aVec[SMDSEntity_Node];
919 nb1d_e += std::max(aVec[SMDSEntity_Edge],aVec[SMDSEntity_Quad_Edge]);
921 IsQuadratic = (aVec[SMDSEntity_Quad_Edge] > aVec[SMDSEntity_Edge]);
927 double ELen_face = sqrt(2.* ( fullArea/double(nbtri+nbqua*2) ) / sqrt(3.0) );
928 double ELen_vol = pow( 72, 1/6. ) * pow( _maxElementVolume, 1/3. );
929 double ELen = Min(ELen_vol,ELen_face*2);
932 BRepGProp::VolumeProperties(aShape,G);
933 double aVolume = G.Mass();
934 double tetrVol = 0.1179*ELen*ELen*ELen;
935 double CoeffQuality = 0.9;
936 smIdType nbVols = (smIdType)( aVolume/tetrVol/CoeffQuality );
937 smIdType nb1d_f = (nbtri*3 + nbqua*4 - nb1d_e) / 2;
938 smIdType nb1d_in = (nbVols*6 - nb1d_e - nb1d_f ) / 5;
939 std::vector<smIdType> aVec(SMDSEntity_Last);
940 for(smIdType i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i]=0;
942 aVec[SMDSEntity_Node] = nb1d_in/6 + 1 + nb1d_in;
943 aVec[SMDSEntity_Quad_Tetra] = nbVols - nbqua*2;
944 aVec[SMDSEntity_Quad_Pyramid] = nbqua;
947 aVec[SMDSEntity_Node] = nb1d_in/6 + 1;
948 aVec[SMDSEntity_Tetra] = nbVols - nbqua*2;
949 aVec[SMDSEntity_Pyramid] = nbqua;
951 SMESH_subMesh *sm = aMesh.GetSubMesh(aShape);
952 aResMap.insert(std::make_pair(sm,aVec));