1 // Copyright (C) 2007-2021 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 // File : netgen_mesher.cxx
24 // Author : Yoann AUDOUIN, EDF
28 #include "netgen_mesher.hxx"
30 #include "DriverStep.hxx"
31 #include "DriverMesh.hxx"
32 #include "netgen_param.hxx"
37 namespace fs = std::filesystem;
41 #include <SMESH_Mesh.hxx>
42 #include <SMESH_subMesh.hxx>
43 #include <SMESH_Gen.hxx>
44 #include <SMESH_Algo.hxx>
45 #include <SMESHDS_Mesh.hxx>
46 #include <SMESH_ControlsDef.hxx>
47 #include <SMESH_Comment.hxx>
48 #include <SMESH_ComputeError.hxx>
49 #include <SMESH_MesherHelper.hxx>
50 #include <StdMeshers_MaxElementVolume.hxx>
51 #include <StdMeshers_QuadToTriaAdaptor.hxx>
52 #include <StdMeshers_ViscousLayers.hxx>
53 #include <StdMeshers_ViscousLayers2D.hxx>
57 // #include <NETGENPlugin_Mesher.hxx>
58 // #include <NETGENPlugin_Hypothesis.hxx>
59 #include "NETGENPlugin_Mesher.hxx"
60 #include "NETGENPlugin_Hypothesis.hxx"
65 #include <BRepClass3d_SolidClassifier.hxx>
66 #include <GProp_GProps.hxx>
67 #include <BRepGProp.hxx>
69 #include <Standard_Failure.hxx>
70 #include <Standard_ErrorHandler.hxx>
78 #include <occgeom.hpp>
79 #include <meshing.hpp>
82 #include <ngexception.hpp>
85 #include <core/exception.hpp>
93 NETGENPLUGIN_DLL_HEADER
94 extern MeshingParameters mparam;
96 NETGENPLUGIN_DLL_HEADER
97 extern volatile multithreadt multithread;
99 NETGENPLUGIN_DLL_HEADER
100 extern bool merge_solids;
103 extern void OCCSetLocalMeshSize(OCCGeometry & geom, Mesh & mesh);
106 using namespace nglib;
108 int error(int error_type, std::string msg)
110 std::cerr << msg << std::endl;
114 int error(const SMESH_Comment& comment)
116 return error(1, "SMESH_Comment error: "+comment);
120 * @brief Set the netgen parameters
122 * @param aParams Internal structure of parameters
123 * @param mparams Netgen strcuture of parameters
125 void set_netgen_parameters(netgen_params& aParams)
128 // Default parameters
131 //netgen::mparam.nthreads = std::thread::hardware_concurrency();
132 netgen::mparam.nthreads = aParams.nbThreads;
133 netgen::mparam.parallel_meshing = aParams.nbThreads > 1;
136 if ( getenv( "SALOME_NETGEN_DISABLE_MULTITHREADING" ))
138 netgen::mparam.nthreads = 1;
139 netgen::mparam.parallel_meshing = false;
144 // Initialize global NETGEN parameters:
145 netgen::mparam.maxh = aParams.maxh;
146 netgen::mparam.minh = aParams.minh;
147 netgen::mparam.segmentsperedge = aParams.segmentsperedge;
148 netgen::mparam.grading = aParams.grading;
149 netgen::mparam.curvaturesafety = aParams.curvaturesafety;
150 netgen::mparam.secondorder = aParams.secondorder;
151 netgen::mparam.quad = aParams.quad;
152 netgen::mparam.uselocalh = aParams.uselocalh;
153 netgen::merge_solids = aParams.merge_solids;
154 netgen::mparam.optsteps2d = aParams.optsteps2d;
155 netgen::mparam.optsteps3d = aParams.optsteps3d;
156 netgen::mparam.elsizeweight = aParams.elsizeweight;
157 netgen::mparam.opterrpow = aParams.opterrpow;
158 netgen::mparam.delaunay = aParams.delaunay;
159 netgen::mparam.checkoverlap = aParams.checkoverlap;
160 netgen::mparam.checkchartboundary = aParams.checkchartboundary;
163 netgen::mparam.meshsizefilename = aParams.meshsizefilename;
164 netgen::mparam.closeedgefac = aParams.closeedgefac;
168 netgen::mparam.meshsizefilename= aParams.meshsizefilename.empty() ? 0 : aParams.meshsizefilename.c_str();
173 * @brief compute mesh with netgen3d
175 * @param input_mesh_file Input Mesh file
176 * @param shape_file Shape file
177 * @param hypo_file Parameter file
178 * @param new_element_file Binary file containing new nodes and new element info
179 * @param output_mesh If true will export mesh into output_mesh_file
180 * @param output_mesh_file Output Mesh file
184 int netgen3d(const std::string input_mesh_file,
185 const std::string shape_file,
186 const std::string hypo_file,
187 const std::string element_orientation_file,
188 const std::string new_element_file,
190 const std::string output_mesh_file,
193 auto time0 = std::chrono::high_resolution_clock::now();
197 SMESH_Mesh *myMesh = gen.CreateMesh(false);
199 std::string mesh_name = "Maillage_1";
201 import_mesh(input_mesh_file, *myMesh, mesh_name);
202 auto time1 = std::chrono::high_resolution_clock::now();
203 auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(time1-time0);
204 std::cout << "Time for import_mesh: " << elapsed.count() * 1e-9 << std::endl;
207 TopoDS_Shape myShape;
208 import_shape(shape_file, myShape);
209 auto time2 = std::chrono::high_resolution_clock::now();
210 elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(time2-time1);
211 std::cout << "Time for import_shape: " << elapsed.count() * 1e-9 << std::endl;
213 // Importing hypothesis
214 netgen_params myParams;
216 import_netgen_params(hypo_file, myParams);
217 auto time3 = std::chrono::high_resolution_clock::now();
218 elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(time3-time2);
219 std::cout << "Time for import_netgen_param: " << elapsed.count() * 1e-9 << std::endl;
220 // Setting number of threads for netgen
221 myParams.nbThreads = nbThreads;
223 std::cout << "Meshing with netgen3d" << std::endl;
224 int ret = netgen3d_internal(myShape, *myMesh, myParams,
225 new_element_file, element_orientation_file,
230 std::cout << "Meshing failed" << std::endl;
235 auto time4 = std::chrono::high_resolution_clock::now();
236 export_mesh(output_mesh_file, *myMesh, mesh_name);
237 auto time5 = std::chrono::high_resolution_clock::now();
238 elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(time5-time4);
239 std::cout << "Time for export_mesh: " << elapsed.count() * 1e-9 << std::endl;
246 * @brief Compute aShape within aMesh using netgen3d
248 * @param aShape the shape
249 * @param aMesh the mesh
250 * @param aParams the netgen parameters
251 * @param new_element_file file containing data on the new point/tetra added by netgen
255 int netgen3d_internal(TopoDS_Shape &aShape, SMESH_Mesh& aMesh, netgen_params& aParams,
256 std::string new_element_file, std::string element_orientation_file,
260 auto time0 = std::chrono::high_resolution_clock::now();
262 netgen::multithread.terminate = 0;
263 netgen::multithread.task = "Volume meshing";
265 SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
267 SMESH_MesherHelper helper(aMesh);
268 aParams._quadraticMesh = helper.IsQuadraticSubMesh(aShape);
269 helper.SetElementsOnShape( true );
271 int Netgen_NbOfNodes = 0;
272 double Netgen_point[3];
273 int Netgen_triangle[3];
275 NETGENPlugin_NetgenLibWrapper ngLib;
276 Ng_Mesh * Netgen_mesh = (Ng_Mesh*)ngLib._ngMesh;
278 // vector of nodes in which node index == netgen ID
279 vector< const SMDS_MeshNode* > nodeVec;
281 const int invalid_ID = -1;
283 SMESH::Controls::Area areaControl;
284 SMESH::Controls::TSequenceOfXYZ nodesCoords;
286 // maps nodes to ng ID
287 typedef map< const SMDS_MeshNode*, int, TIDCompare > TNodeToIDMap;
288 typedef TNodeToIDMap::value_type TN2ID;
289 TNodeToIDMap nodeToNetgenID;
291 // find internal shapes
292 NETGENPlugin_Internals internals( aMesh, aShape, /*is3D=*/true );
294 // ---------------------------------
295 // Feed the Netgen with surface mesh
296 // ---------------------------------
298 TopAbs_ShapeEnum mainType = aMesh.GetShapeToMesh().ShapeType();
299 bool checkReverse = ( mainType == TopAbs_COMPOUND || mainType == TopAbs_COMPSOLID );
301 SMESH_ProxyMesh::Ptr proxyMesh( new SMESH_ProxyMesh( aMesh ));
302 if ( aParams._viscousLayersHyp )
304 netgen::multithread.percent = 3;
305 proxyMesh = aParams._viscousLayersHyp->Compute( aMesh, aShape );
309 if ( aMesh.NbQuadrangles() > 0 )
311 netgen::multithread.percent = 6;
312 StdMeshers_QuadToTriaAdaptor* Adaptor = new StdMeshers_QuadToTriaAdaptor;
313 Adaptor->Compute(aMesh,aShape,proxyMesh.get());
314 proxyMesh.reset( Adaptor );
317 // Get list of elements + their orientation from element_orientation file
318 std::map<vtkIdType, bool> elemOrientation;
320 std::ifstream df(element_orientation_file, ios::binary|ios::in);
324 // Warning of the use of vtkIdType (I had issue when run_mesher was compiled with internal vtk) and salome not
325 // Sizeof was the same but how he othered the type was different
326 // Maybe using another type (uint64_t) instead would be better
328 df.read((char*)&nbElement, sizeof(int));
330 for(int ielem=0;ielem<nbElement;++ielem){
331 df.read((char*) &id, sizeof(vtkIdType));
332 df.read((char*) &orient, sizeof(bool));
333 elemOrientation[id] = orient;
337 // Adding elements from Mesh
338 SMDS_ElemIteratorPtr iteratorElem = meshDS->elementsIterator(SMDSAbs_Face);
340 bool isInternalFace = false;
344 while ( iteratorElem->more() ) // loop on elements on a geom face
347 const SMDS_MeshElement* elem = iteratorElem->next();
349 return error( COMPERR_BAD_INPUT_MESH, "Null element encounters");
350 if ( elem->NbCornerNodes() != 3 )
351 return error( COMPERR_BAD_INPUT_MESH, "Not triangle element encounters");
353 // Keeping only element that are in the element orientation file
354 isIn = elemOrientation.count(elem->GetID())==1;
361 // Netgen requires that all the triangle point outside
362 isRev = elemOrientation[elem->GetID()];
364 // Add nodes of triangles and triangles them-selves to netgen mesh
366 // add three nodes of triangle
367 bool hasDegen = false;
368 for ( int iN = 0; iN < 3; ++iN )
370 const SMDS_MeshNode* node = elem->GetNode( iN );
371 const int shapeID = node->getshapeId();
372 if ( node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_EDGE &&
373 helper.IsDegenShape( shapeID ))
375 // ignore all nodes on degeneraged edge and use node on its vertex instead
376 TopoDS_Shape vertex = TopoDS_Iterator( meshDS->IndexToShape( shapeID )).Value();
377 node = SMESH_Algo::VertexNode( TopoDS::Vertex( vertex ), meshDS );
380 int& ngID = nodeToNetgenID.insert(TN2ID( node, invalid_ID )).first->second;
381 if ( ngID == invalid_ID )
383 ngID = ++Netgen_NbOfNodes;
384 Netgen_point [ 0 ] = node->X();
385 Netgen_point [ 1 ] = node->Y();
386 Netgen_point [ 2 ] = node->Z();
387 Ng_AddPoint(Netgen_mesh, Netgen_point);
390 Netgen_triangle[ isRev ? 2-iN : iN ] = ngID;
393 if ( hasDegen && (Netgen_triangle[0] == Netgen_triangle[1] ||
394 Netgen_triangle[0] == Netgen_triangle[2] ||
395 Netgen_triangle[2] == Netgen_triangle[1] ))
398 Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
400 // TODO: Handle that case (quadrangle 2D) (isInternal is set to false)
401 if ( isInternalFace && !proxyMesh->IsTemporary( elem ))
403 swap( Netgen_triangle[1], Netgen_triangle[2] );
404 Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
408 // insert old nodes into nodeVec
409 nodeVec.resize( nodeToNetgenID.size() + 1, 0 );
410 TNodeToIDMap::iterator n_id = nodeToNetgenID.begin();
411 for ( ; n_id != nodeToNetgenID.end(); ++n_id )
412 nodeVec[ n_id->second ] = n_id->first;
413 nodeToNetgenID.clear();
415 // TODO: Handle internal vertex
416 //if ( internals.hasInternalVertexInSolid() )
418 // netgen::OCCGeometry occgeo;
419 // NETGENPlugin_Mesher::AddIntVerticesInSolids( occgeo,
420 // (netgen::Mesh&) *Netgen_mesh,
425 auto time1 = std::chrono::high_resolution_clock::now();
426 auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(time1-time0);
427 std::cout << "Time for fill_in_ngmesh: " << elapsed.count() * 1e-9 << std::endl;
429 // -------------------------
430 // Generate the volume mesh
431 // -------------------------
432 netgen::multithread.terminate = 0;
434 netgen::Mesh* ngMesh = ngLib._ngMesh;
435 Netgen_mesh = ngLib.ngMesh();
436 Netgen_NbOfNodes = Ng_GetNP( Netgen_mesh );
439 int startWith = netgen::MESHCONST_MESHVOLUME;
440 int endWith = netgen::MESHCONST_OPTVOLUME;
443 NETGENPlugin_Mesher aMesher( &aMesh, helper.GetSubShape(), /*isVolume=*/true );
444 netgen::OCCGeometry occgeo;
445 set_netgen_parameters(aParams);
447 if ( aParams.has_netgen_param )
449 if ( aParams.has_local_size)
451 if ( ! &ngMesh->LocalHFunction() )
453 netgen::Point3d pmin, pmax;
454 ngMesh->GetBox( pmin, pmax, 0 );
455 ngMesh->SetLocalH( pmin, pmax, aParams.grading );
457 aMesher.SetLocalSize( occgeo, *ngMesh );
460 ngMesh->LoadLocalMeshSize( netgen::mparam.meshsizefilename );
461 } catch (netgen::NgException & ex) {
462 return error( COMPERR_BAD_PARMETERS, ex.What() );
465 if ( !aParams.optimize )
466 endWith = netgen::MESHCONST_MESHVOLUME;
468 else if ( aParams.has_maxelementvolume_hyp )
470 netgen::mparam.maxh = pow( 72, 1/6. ) * pow( aParams.maxElementVolume, 1/3. );
471 // limitVolumeSize( ngMesh, netgen::mparam.maxh ); // result is unpredictable
473 else if ( aMesh.HasShapeToMesh() )
475 aMesher.PrepareOCCgeometry( occgeo, helper.GetSubShape(), aMesh );
476 netgen::mparam.maxh = occgeo.GetBoundingBox().Diam()/2;
480 netgen::Point3d pmin, pmax;
481 ngMesh->GetBox (pmin, pmax);
482 netgen::mparam.maxh = Dist(pmin, pmax)/2;
485 if ( !aParams.has_netgen_param && aMesh.HasShapeToMesh() )
487 netgen::mparam.minh = aMesher.GetDefaultMinSize( helper.GetSubShape(), netgen::mparam.maxh );
494 ngLib.CalcLocalH(ngMesh);
495 err = ngLib.GenerateMesh(occgeo, startWith, endWith, ngMesh);
497 if(netgen::multithread.terminate)
500 return error(SMESH_Comment("Error in netgen::OCCGenerateMesh() at ") << netgen::multithread.task);
502 catch (Standard_Failure& ex)
504 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
505 str << " at " << netgen::multithread.task
506 << ": " << ex.DynamicType()->Name();
507 if ( ex.GetMessageString() && strlen( ex.GetMessageString() ))
508 str << ": " << ex.GetMessageString();
511 catch (netgen::NgException& exc)
513 SMESH_Comment str("NgException");
514 if ( strlen( netgen::multithread.task ) > 0 )
515 str << " at " << netgen::multithread.task;
516 str << ": " << exc.What();
521 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
522 if ( strlen( netgen::multithread.task ) > 0 )
523 str << " at " << netgen::multithread.task;
527 int Netgen_NbOfNodesNew = Ng_GetNP(Netgen_mesh);
528 int Netgen_NbOfTetra = Ng_GetNE(Netgen_mesh);
530 // -------------------------------------------------------------------
531 // Feed back the SMESHDS with the generated Nodes and Volume Elements
532 // -------------------------------------------------------------------
536 SMESH_ComputeErrorPtr ce = NETGENPlugin_Mesher::ReadErrors(nodeVec);
537 if ( ce && ce->HasBadElems() )
540 auto time2 = std::chrono::high_resolution_clock::now();
541 elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(time2-time1);
542 std::cout << "Time for netgen_compute: " << elapsed.count() * 1e-9 << std::endl;
544 bool isOK = ( /*status == NG_OK &&*/ Netgen_NbOfTetra > 0 );// get whatever built
547 std::ofstream df(new_element_file, ios::out|ios::binary);
549 double Netgen_point[3];
550 int Netgen_tetrahedron[4];
552 // Writing nodevec (correspondence netgen numbering mesh numbering)
554 df.write((char*) &Netgen_NbOfNodes, sizeof(int));
555 df.write((char*) &Netgen_NbOfNodesNew, sizeof(int));
556 for (int nodeIndex = 1 ; nodeIndex <= Netgen_NbOfNodes; ++nodeIndex )
559 int id = nodeVec.at(nodeIndex)->GetID();
560 df.write((char*) &id, sizeof(int));
563 // Writing info on new points
564 for (int nodeIndex = Netgen_NbOfNodes +1 ; nodeIndex <= Netgen_NbOfNodesNew; ++nodeIndex )
566 Ng_GetPoint(Netgen_mesh, nodeIndex, Netgen_point );
567 // Coordinates of the point
568 df.write((char *) &Netgen_point, sizeof(double)*3);
571 // create tetrahedrons
572 df.write((char*) &Netgen_NbOfTetra, sizeof(int));
573 for ( int elemIndex = 1; elemIndex <= Netgen_NbOfTetra; ++elemIndex )
575 Ng_GetVolumeElement(Netgen_mesh, elemIndex, Netgen_tetrahedron);
576 df.write((char*) &Netgen_tetrahedron, sizeof(int)*4);
579 auto time3 = std::chrono::high_resolution_clock::now();
580 elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(time3-time2);
581 std::cout << "Time for write_new_elem: " << elapsed.count() * 1e-9 << std::endl;
584 // Adding new files in aMesh as well
587 double Netgen_point[3];
588 int Netgen_tetrahedron[4];
590 // create and insert new nodes into nodeVec
591 nodeVec.resize( Netgen_NbOfNodesNew + 1, 0 );
592 int nodeIndex = Netgen_NbOfNodes + 1;
593 for ( ; nodeIndex <= Netgen_NbOfNodesNew; ++nodeIndex )
595 Ng_GetPoint( Netgen_mesh, nodeIndex, Netgen_point );
596 nodeVec.at(nodeIndex) = helper.AddNode(Netgen_point[0],
601 // create tetrahedrons
602 for ( int elemIndex = 1; elemIndex <= Netgen_NbOfTetra; ++elemIndex )
604 Ng_GetVolumeElement(Netgen_mesh, elemIndex, Netgen_tetrahedron);
607 helper.AddVolume (nodeVec.at( Netgen_tetrahedron[0] ),
608 nodeVec.at( Netgen_tetrahedron[1] ),
609 nodeVec.at( Netgen_tetrahedron[2] ),
610 nodeVec.at( Netgen_tetrahedron[3] ));
616 auto time4 = std::chrono::high_resolution_clock::now();
617 elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(time4-time3);
618 std::cout << "Time for add_element_to_smesh: " << elapsed.count() * 1e-9 << std::endl;
626 * @brief compute mesh with netgen2d
628 * @param input_mesh_file Input Mesh file
629 * @param shape_file Shape file
630 * @param hypo_file Parameter file
631 * @param new_element_file Binary file containing new nodes and new element info
632 * @param output_mesh If true will export mesh into output_mesh_file
633 * @param output_mesh_file Output Mesh file
637 int netgen2d(const std::string input_mesh_file,
638 const std::string shape_file,
639 const std::string hypo_file,
640 const std::string element_orientation_file,
641 const std::string new_element_file,
643 const std::string output_mesh_file)
649 SMESH_Mesh *myMesh = gen.CreateMesh(false);
651 std::string mesh_name = "Maillage_1";
653 import_mesh(input_mesh_file, *myMesh, mesh_name);
656 TopoDS_Shape myShape;
657 import_shape(shape_file, myShape);
659 // Importing hypothesis
660 netgen_params myParams;
662 import_netgen_params(hypo_file, myParams);
664 std::cout << "Meshing with netgen3d" << std::endl;
665 int ret = netgen2d_internal(myShape, *myMesh, myParams,
666 new_element_file, element_orientation_file,
670 std::cout << "Meshing failed" << std::endl;
675 export_mesh(output_mesh_file, *myMesh, mesh_name);
681 // TODO: Not working properly
683 * @brief Compute aShape within aMesh using netgen2d
685 * @param aShape the shape
686 * @param aMesh the mesh
687 * @param aParams the netgen parameters
688 * @param new_element_file file containing data on the new point/tetra added by netgen
692 int netgen2d_internal(TopoDS_Shape &aShape, SMESH_Mesh& aMesh, netgen_params& aParams,
693 std::string new_element_file, std::string element_orientation_file,
696 netgen::multithread.terminate = 0;
697 netgen::multithread.task = "Surface meshing";
699 SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
700 SMESH_MesherHelper helper(aMesh);
701 helper.SetElementsOnShape( true );
703 NETGENPlugin_NetgenLibWrapper ngLib;
704 ngLib._isComputeOk = false;
706 netgen::Mesh ngMeshNoLocSize;
707 netgen::Mesh * ngMeshes[2] = { (netgen::Mesh*) ngLib._ngMesh, & ngMeshNoLocSize };
708 netgen::OCCGeometry occgeoComm;
710 std::map<vtkIdType, bool> elemOrientation;
712 typedef map< const SMDS_MeshNode*, int, TIDCompare > TNodeToIDMap;
713 typedef TNodeToIDMap::value_type TN2ID;
714 const int invalid_ID = -1;
715 int Netgen_NbOfNodes=0;
716 double Netgen_point[3];
717 int Netgen_segment[2];
718 int Netgen_triangle[3];
720 // min / max sizes are set as follows:
721 // if ( _hypParameters )
722 // min and max are defined by the user
723 // else if ( aParams.has_LengthFromEdges_hyp )
724 // min = aMesher.GetDefaultMinSize()
725 // max = average segment len of a FACE
726 // else if ( _hypMaxElementArea )
727 // min = aMesher.GetDefaultMinSize()
728 // max = f( _hypMaxElementArea )
730 // min = aMesher.GetDefaultMinSize()
731 // max = max segment len of a FACE
732 NETGENPlugin_Mesher aMesher( &aMesh, aShape, /*isVolume=*/false);
733 set_netgen_parameters( aParams );
734 const bool toOptimize = aParams.optimize;
735 if ( aParams.has_maxelementvolume_hyp )
737 netgen::mparam.maxh = sqrt( 2. * aParams.maxElementVolume / sqrt(3.0) );
739 netgen::mparam.quad = aParams.quad;
741 // local size is common for all FACEs in aShape?
742 const bool isCommonLocalSize = ( !aParams.has_LengthFromEdges_hyp && !aParams.has_maxelementvolume_hyp && netgen::mparam.uselocalh );
743 const bool isDefaultHyp = ( !aParams.has_LengthFromEdges_hyp && !aParams.has_maxelementvolume_hyp && !aParams.has_netgen_param );
746 if ( isCommonLocalSize ) // compute common local size in ngMeshes[0]
748 //list< SMESH_subMesh* > meshedSM[4]; --> all sub-shapes are added to occgeoComm
749 aMesher.PrepareOCCgeometry( occgeoComm, aShape, aMesh );//, meshedSM );
751 // local size set at MESHCONST_ANALYSE step depends on
752 // minh, face_maxh, grading and curvaturesafety; find minh if not set by the user
753 if ( !aParams.has_netgen_param || netgen::mparam.minh < DBL_MIN )
755 if ( !aParams.has_netgen_param )
756 netgen::mparam.maxh = occgeoComm.GetBoundingBox().Diam() / 3.;
757 netgen::mparam.minh = aMesher.GetDefaultMinSize( aShape, netgen::mparam.maxh );
759 // set local size depending on curvature and NOT closeness of EDGEs
761 const double factor = 2; //netgen::occparam.resthcloseedgefac;
763 const double factor = netgen::occparam.resthcloseedgefac;
764 netgen::occparam.resthcloseedgeenable = false;
765 netgen::occparam.resthcloseedgefac = 1.0 + netgen::mparam.grading;
767 occgeoComm.face_maxh = netgen::mparam.maxh;
769 netgen::OCCParameters occparam;
770 netgen::OCCSetLocalMeshSize( occgeoComm, *ngMeshes[0], netgen::mparam, occparam );
772 netgen::OCCSetLocalMeshSize( occgeoComm, *ngMeshes[0] );
774 occgeoComm.emap.Clear();
775 occgeoComm.vmap.Clear();
777 // Reading list of element to integrate into netgen mesh
779 std::ifstream df(element_orientation_file, ios::in|ios::binary);
783 df.read((char*)&nbElement, sizeof(int));
785 for(int ielem=0;ielem<nbElement;++ielem){
786 df.read((char*) &id, sizeof(vtkIdType));
787 df.read((char*) &orient, sizeof(bool));
788 elemOrientation[id] = orient;
793 // set local size according to size of existing segments
794 SMDS_ElemIteratorPtr iteratorElem = meshDS->elementsIterator(SMDSAbs_Edge);
795 while ( iteratorElem->more() ) // loop on elements on a geom face
797 const SMDS_MeshElement* seg = iteratorElem->next();
798 // Keeping only element that are in the element orientation file
799 isIn = elemOrientation.count(seg->GetID())==1;
804 SMESH_TNodeXYZ n1 = seg->GetNode(0);
805 SMESH_TNodeXYZ n2 = seg->GetNode(1);
806 gp_XYZ p = 0.5 * ( n1 + n2 );
807 netgen::Point3d pi(p.X(), p.Y(), p.Z());
808 ngMeshes[0]->RestrictLocalH( pi, factor * ( n1 - n2 ).Modulus() );
811 // set local size defined on shapes
812 aMesher.SetLocalSize( occgeoComm, *ngMeshes[0] );
813 aMesher.SetLocalSizeForChordalError( occgeoComm, *ngMeshes[0] );
815 ngMeshes[0]->LoadLocalMeshSize( netgen::mparam.meshsizefilename );
816 } catch (netgen::NgException & ex) {
817 return error( COMPERR_BAD_PARMETERS, ex.What() );
820 netgen::mparam.uselocalh = toOptimize; // restore as it is used at surface optimization
821 // ==================
823 // ==================
825 vector< const SMDS_MeshNode* > nodeVec;
828 netgen::OCCGeometry occgeom;
829 occgeom.shape = aShape;
830 occgeom.fmap.Add( aShape );
831 occgeom.CalcBoundingBox();
832 occgeom.facemeshstatus.SetSize(1);
833 occgeom.facemeshstatus = 0;
834 occgeom.face_maxh_modified.SetSize(1);
835 occgeom.face_maxh_modified = 0;
836 occgeom.face_maxh.SetSize(1);
837 occgeom.face_maxh = netgen::mparam.maxh;
839 // -------------------------
841 // -------------------------
842 // maps nodes to ng ID
845 // MESHCONST_ANALYSE step may lead to a failure, so we make an attempt
846 // w/o MESHCONST_ANALYSE at the second loop
848 enum { LOC_SIZE, NO_LOC_SIZE };
849 int iLoop = isCommonLocalSize ? 0 : 1;
850 int faceID = occgeom.fmap.FindIndex(aShape);
852 for ( ; iLoop < 2; iLoop++ )
854 //bool isMESHCONST_ANALYSE = false;
855 //TODO: check how to replace that
856 //InitComputeError();
858 netgen::Mesh * ngMesh = ngMeshes[ iLoop ];
859 ngMesh->DeleteMesh();
861 if ( iLoop == NO_LOC_SIZE )
863 ngMesh->SetGlobalH ( netgen::mparam.maxh );
864 ngMesh->SetMinimalH( netgen::mparam.minh );
865 netgen::Box<3> bb = occgeom.GetBoundingBox();
866 bb.Increase (bb.Diam()/10);
867 ngMesh->SetLocalH (bb.PMin(), bb.PMax(), netgen::mparam.grading);
868 aMesher.SetLocalSize( occgeom, *ngMesh );
869 aMesher.SetLocalSizeForChordalError( occgeoComm, *ngMesh );
871 ngMesh->LoadLocalMeshSize( netgen::mparam.meshsizefilename );
872 } catch (netgen::NgException & ex) {
873 return error( COMPERR_BAD_PARMETERS, ex.What() );
877 TNodeToIDMap nodeToNetgenID;
880 ngMesh->AddFaceDescriptor( netgen::FaceDescriptor( faceID, solidID, solidID, 0 ));
881 // set local size according to size of existing segments
882 SMDS_ElemIteratorPtr iteratorElem = meshDS->elementsIterator(SMDSAbs_Edge);
883 while ( iteratorElem->more() ) // loop on elements on a geom face
885 const SMDS_MeshElement* elem = iteratorElem->next();
886 // Keeping only element that are in the element orientation file
887 bool isIn = elemOrientation.count(elem->GetID())==1;
892 bool isRev = elemOrientation[elem->GetID()];
897 for ( int iN = 0; iN < 2; ++iN )
899 const SMDS_MeshNode* node = elem->GetNode( iN );
900 const int shapeID = node->getshapeId();
901 int& ngID = nodeToNetgenID.insert(TN2ID( node, invalid_ID )).first->second;
902 if ( ngID == invalid_ID )
904 ngID = ++Netgen_NbOfNodes;
905 Netgen_point [ 0 ] = node->X();
906 Netgen_point [ 1 ] = node->Y();
907 Netgen_point [ 2 ] = node->Z();
908 netgen::MeshPoint mp( netgen::Point<3> (node->X(), node->Y(), node->Z()) );
909 ngMesh->AddPoint ( mp, 1, netgen::EDGEPOINT );
911 Netgen_segment[ isRev ? 1-iN : iN ] = ngID;
916 seg[0] = Netgen_segment[0];
917 seg[1] = Netgen_segment[1];
918 seg.edgenr = ngMesh->GetNSeg() +1;
921 ngMesh->AddSegment(seg);
923 int nbNodes2 = ngMesh->GetNP();
924 int nseg = ngMesh->GetNSeg();
926 // insert old nodes into nodeVec
927 nodeVec.resize( nodeToNetgenID.size() + 1, 0 );
928 TNodeToIDMap::iterator n_id = nodeToNetgenID.begin();
929 for ( ; n_id != nodeToNetgenID.end(); ++n_id )
930 nodeVec[ n_id->second ] = n_id->first;
931 nodeToNetgenID.clear();
934 //if ( !isCommonLocalSize )
935 //limitSize( ngMesh, mparam.maxh * 0.8);
937 // -------------------------
938 // Generate surface mesh
939 // -------------------------
941 const int startWith = netgen::MESHCONST_MESHSURFACE;
942 const int endWith = toOptimize ? netgen::MESHCONST_OPTSURFACE : netgen::MESHCONST_MESHSURFACE;
947 err = ngLib.GenerateMesh(occgeom, startWith, endWith, ngMesh);
948 if ( netgen::multithread.terminate )
951 str << "Error in netgen::OCCGenerateMesh() at " << netgen::multithread.task;
953 catch (Standard_Failure& ex)
956 str << "Exception in netgen::OCCGenerateMesh()"
957 << " at " << netgen::multithread.task
958 << ": " << ex.DynamicType()->Name();
959 if ( ex.GetMessageString() && strlen( ex.GetMessageString() ))
960 str << ": " << ex.GetMessageString();
964 str << "Exception in netgen::OCCGenerateMesh()"
965 << " at " << netgen::multithread.task;
969 if ( iLoop == LOC_SIZE )
971 std::cout << "Need second run" << std::endl;
972 /*netgen::mparam.minh = netgen::mparam.maxh;
973 netgen::mparam.maxh = 0;
974 for ( size_t iW = 0; iW < wires.size(); ++iW )
976 StdMeshers_FaceSidePtr wire = wires[ iW ];
977 const vector<UVPtStruct>& uvPtVec = wire->GetUVPtStruct();
978 for ( size_t iP = 1; iP < uvPtVec.size(); ++iP )
980 SMESH_TNodeXYZ p( uvPtVec[ iP ].node );
981 netgen::Point3d np( p.X(),p.Y(),p.Z());
982 double segLen = p.Distance( uvPtVec[ iP-1 ].node );
983 double size = ngMesh->GetH( np );
984 netgen::mparam.minh = Min( netgen::mparam.minh, size );
985 netgen::mparam.maxh = Max( netgen::mparam.maxh, segLen );
988 //cerr << "min " << mparam.minh << " max " << mparam.maxh << endl;
989 netgen::mparam.minh *= 0.9;
990 netgen::mparam.maxh *= 1.1;
996 //faceErr.reset( new SMESH_ComputeError( COMPERR_ALGO_FAILED, str ));
1000 // ----------------------------------------------------
1001 // Fill the SMESHDS with the generated nodes and faces
1002 // ----------------------------------------------------
1006 int nbNodes = ngMesh->GetNP();
1007 int nbFaces = ngMesh->GetNSE();
1008 std::cout << nbFaces << " " << nbNodes << std::endl;
1010 int nbInputNodes = (int) nodeVec.size()-1;
1011 nodeVec.resize( nbNodes+1, 0 );
1014 for ( int ngID = nbInputNodes + 1; ngID <= nbNodes; ++ngID )
1016 const netgen::MeshPoint& ngPoint = ngMesh->Point( ngID );
1017 SMDS_MeshNode * node = meshDS->AddNode(ngPoint(0), ngPoint(1), ngPoint(2));
1018 nodeVec[ ngID ] = node;
1023 for ( i = 1; i <= nbFaces ; ++i )
1025 Ng_GetVolumeElement(ngLib.ngMesh(), i, Netgen_triangle);
1027 helper.AddFace (nodeVec.at( Netgen_triangle[0] ),
1028 nodeVec.at( Netgen_triangle[1] ),
1029 nodeVec.at( Netgen_triangle[2] ));
1036 //} // loop on FACEs