1 // Copyright (C) 2007-2013 CEA/DEN, EDF R&D, OPEN CASCADE
3 // This library is free software; you can redistribute it and/or
4 // modify it under the terms of the GNU Lesser General Public
5 // License as published by the Free Software Foundation; either
6 // version 2.1 of the License.
8 // This library is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 // Lesser General Public License for more details.
13 // You should have received a copy of the GNU Lesser General Public
14 // License along with this library; if not, write to the Free Software
15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
20 // File : NETGENPlugin_NETGEN_2D_ONLY.cxx
21 // Author : Edward AGAPOV (OCC)
24 #include "NETGENPlugin_NETGEN_2D_ONLY.hxx"
26 #include "NETGENPlugin_Mesher.hxx"
27 #include "NETGENPlugin_Hypothesis_2D.hxx"
29 #include <SMDS_MeshElement.hxx>
30 #include <SMDS_MeshNode.hxx>
31 #include <SMESHDS_Mesh.hxx>
32 #include <SMESH_Comment.hxx>
33 #include <SMESH_Gen.hxx>
34 #include <SMESH_Mesh.hxx>
35 #include <SMESH_MesherHelper.hxx>
36 #include <SMESH_subMesh.hxx>
37 #include <StdMeshers_FaceSide.hxx>
38 #include <StdMeshers_LengthFromEdges.hxx>
39 #include <StdMeshers_MaxElementArea.hxx>
40 #include <StdMeshers_QuadranglePreference.hxx>
41 #include <StdMeshers_ViscousLayers2D.hxx>
43 #include <Precision.hxx>
44 #include <Standard_ErrorHandler.hxx>
45 #include <Standard_Failure.hxx>
47 #include <utilities.h>
62 #include <occgeom.hpp>
63 #include <meshing.hpp>
64 //#include <meshtype.hpp>
67 extern int OCCGenerateMesh (OCCGeometry&, Mesh*&, MeshingParameters&, int, int);
69 extern int OCCGenerateMesh (OCCGeometry&, Mesh*&, int, int, char*);
71 extern MeshingParameters mparam;
75 using namespace netgen;
76 using namespace nglib;
78 //#define DUMP_SEGMENTS
80 //=============================================================================
84 //=============================================================================
86 NETGENPlugin_NETGEN_2D_ONLY::NETGENPlugin_NETGEN_2D_ONLY(int hypId, int studyId,
88 : SMESH_2D_Algo(hypId, studyId, gen)
90 MESSAGE("NETGENPlugin_NETGEN_2D_ONLY::NETGENPlugin_NETGEN_2D_ONLY");
91 _name = "NETGEN_2D_ONLY";
93 _shapeType = (1 << TopAbs_FACE);// 1 bit /shape type
95 _compatibleHypothesis.push_back("MaxElementArea");
96 _compatibleHypothesis.push_back("LengthFromEdges");
97 _compatibleHypothesis.push_back("QuadranglePreference");
98 _compatibleHypothesis.push_back("NETGEN_Parameters_2D");
99 _compatibleHypothesis.push_back("ViscousLayers2D");
101 _hypMaxElementArea = 0;
102 _hypLengthFromEdges = 0;
103 _hypQuadranglePreference = 0;
107 //=============================================================================
111 //=============================================================================
113 NETGENPlugin_NETGEN_2D_ONLY::~NETGENPlugin_NETGEN_2D_ONLY()
115 MESSAGE("NETGENPlugin_NETGEN_2D_ONLY::~NETGENPlugin_NETGEN_2D_ONLY");
118 //=============================================================================
122 //=============================================================================
124 bool NETGENPlugin_NETGEN_2D_ONLY::CheckHypothesis (SMESH_Mesh& aMesh,
125 const TopoDS_Shape& aShape,
126 Hypothesis_Status& aStatus)
128 _hypMaxElementArea = 0;
129 _hypLengthFromEdges = 0;
130 _hypQuadranglePreference = 0;
131 _isSurfaceMeshing = true;
133 const list<const SMESHDS_Hypothesis*>& hyps = GetUsedHypothesis(aMesh, aShape, false);
137 aStatus = HYP_OK; //SMESH_Hypothesis::HYP_MISSING;
138 return true; // (PAL13464) can work with no hypothesis, LengthFromEdges is default one
141 aStatus = HYP_MISSING;
143 list<const SMESHDS_Hypothesis*>::const_iterator ith;
144 for (ith = hyps.begin(); ith != hyps.end(); ++ith )
146 const SMESHDS_Hypothesis* hyp = (*ith);
148 string hypName = hyp->GetName();
150 if ( hypName == "MaxElementArea")
151 _hypMaxElementArea = static_cast<const StdMeshers_MaxElementArea*> (hyp);
152 else if ( hypName == "LengthFromEdges" )
153 _hypLengthFromEdges = static_cast<const StdMeshers_LengthFromEdges*> (hyp);
154 else if ( hypName == "QuadranglePreference" )
155 _hypQuadranglePreference = static_cast<const StdMeshers_QuadranglePreference*>(hyp);
156 else if ( hypName == "NETGEN_Parameters_2D" )
157 _hypParameters = static_cast<const NETGENPlugin_Hypothesis_2D*>(hyp);
158 else if ( hypName == StdMeshers_ViscousLayers2D::GetHypType() )
161 aStatus = HYP_INCOMPATIBLE;
166 int nbHyps = bool(_hypMaxElementArea) + bool(_hypLengthFromEdges) + bool(_hypParameters );
168 aStatus = HYP_CONCURENT;
172 return ( aStatus == HYP_OK );
175 //=============================================================================
177 *Here we are going to use the NETGEN mesher
179 //=============================================================================
181 bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh& aMesh,
182 const TopoDS_Shape& aShape)
184 netgen::multithread.terminate = 0;
185 netgen::multithread.task = "Surface meshing";
187 SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
188 int faceID = meshDS->ShapeToIndex( aShape );
190 SMESH_MesherHelper helper(aMesh);
191 _quadraticMesh = helper.IsQuadraticSubMesh(aShape);
192 helper.SetElementsOnShape( true );
193 const bool ignoreMediumNodes = _quadraticMesh;
195 // build viscous layers if required
196 const TopoDS_Face F = TopoDS::Face( aShape/*.Oriented( TopAbs_FORWARD )*/);
197 SMESH_ProxyMesh::Ptr proxyMesh = StdMeshers_ViscousLayers2D::Compute( aMesh, F );
201 // ------------------------
202 // get all edges of a face
203 // ------------------------
206 StdMeshers_FaceSide::GetFaceWires( F, aMesh, ignoreMediumNodes, problem, proxyMesh );
207 if ( problem && !problem->IsOK() )
208 return error( problem );
209 int nbWires = wires.size();
211 return error( "Problem in StdMeshers_FaceSide::GetFaceWires()");
212 if ( wires[0]->NbSegments() < 3 ) // ex: a circle with 2 segments
213 return error(COMPERR_BAD_INPUT_MESH,
214 SMESH_Comment("Too few segments: ")<<wires[0]->NbSegments());
216 // --------------------
217 // compute edge length
218 // --------------------
220 NETGENPlugin_Mesher aMesher( &aMesh, aShape, /*isVolume=*/false);
221 netgen::OCCGeometry occgeo;
222 aMesher.PrepareOCCgeometry( occgeo, F, aMesh );
223 occgeo.fmap.Clear(); // face can be reversed, which is wrong in this case (issue 19978)
224 occgeo.fmap.Add( F );
226 if ( _hypParameters )
228 aMesher.SetParameters(_hypParameters);
232 double edgeLength = 0;
233 if (_hypLengthFromEdges || (!_hypLengthFromEdges && !_hypMaxElementArea))
236 for ( int iW = 0; iW < nbWires; ++iW )
238 edgeLength += wires[ iW ]->Length();
239 nbSegments += wires[ iW ]->NbSegments();
242 edgeLength /= nbSegments;
244 if ( _hypMaxElementArea )
246 double maxArea = _hypMaxElementArea->GetMaxArea();
247 edgeLength = sqrt(2. * maxArea/sqrt(3.0));
249 if ( edgeLength < DBL_MIN )
250 edgeLength = occgeo.GetBoundingBox().Diam();
252 netgen::mparam.maxh = edgeLength;
253 netgen::mparam.minh = aMesher.GetDefaultMinSize( aShape, netgen::mparam.maxh );
254 netgen::mparam.quad = _hypQuadranglePreference ? 1 : 0;
255 netgen::mparam.grading = 0.7; // very coarse mesh by default
257 occgeo.face_maxh = netgen::mparam.maxh;
259 // -------------------------
260 // Make input netgen mesh
261 // -------------------------
263 NETGENPlugin_NetgenLibWrapper ngLib;
264 netgen::Mesh * ngMesh = (netgen::Mesh*) ngLib._ngMesh;
266 Box<3> bb = occgeo.GetBoundingBox();
267 bb.Increase (bb.Diam()/10);
268 ngMesh->SetLocalH (bb.PMin(), bb.PMax(), netgen::mparam.grading);
269 ngMesh->SetGlobalH (netgen::mparam.maxh);
271 vector< const SMDS_MeshNode* > nodeVec;
272 problem = aMesher.AddSegmentsToMesh( *ngMesh, occgeo, wires, helper, nodeVec );
273 if ( problem && !problem->IsOK() )
274 return error( problem );
276 // -------------------------
277 // Generate surface mesh
278 // -------------------------
283 int startWith = MESHCONST_MESHSURFACE;
284 int endWith = MESHCONST_OPTSURFACE;
288 #if (OCC_VERSION_MAJOR << 16 | OCC_VERSION_MINOR << 8 | OCC_VERSION_MAINTENANCE) > 0x060100
292 err = netgen::OCCGenerateMesh(occgeo, ngMesh, netgen::mparam, startWith, endWith);
294 err = netgen::OCCGenerateMesh(occgeo, ngMesh, startWith, endWith, optstr);
296 if(netgen::multithread.terminate)
299 error(SMESH_Comment("Error in netgen::OCCGenerateMesh() at ") << netgen::multithread.task);
301 catch (Standard_Failure& ex)
303 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
304 str << " at " << netgen::multithread.task
305 << ": " << ex.DynamicType()->Name();
306 if ( ex.GetMessageString() && strlen( ex.GetMessageString() ))
307 str << ": " << ex.GetMessageString();
311 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
312 str << " at " << netgen::multithread.task;
316 // ----------------------------------------------------
317 // Fill the SMESHDS with the generated nodes and faces
318 // ----------------------------------------------------
320 int nbNodes = ngMesh->GetNP();
321 int nbFaces = ngMesh->GetNSE();
323 int nbInputNodes = nodeVec.size()-1;
324 nodeVec.resize( nbNodes+1, 0 );
327 for ( int ngID = nbInputNodes + 1; ngID <= nbNodes; ++ngID )
329 const MeshPoint& ngPoint = ngMesh->Point( ngID );
330 SMDS_MeshNode * node = meshDS->AddNode(ngPoint(0), ngPoint(1), ngPoint(2));
331 nodeVec[ ngID ] = node;
335 const bool reverse = false; //( aShape.Orientation() == TopAbs_REVERSED );
337 for ( i = 1; i <= nbFaces ; ++i )
339 const Element2d& elem = ngMesh->SurfaceElement(i);
340 vector<const SMDS_MeshNode*> nodes( elem.GetNP() );
341 for (j=1; j <= elem.GetNP(); ++j)
343 int pind = elem.PNum(j);
346 const SMDS_MeshNode* node = nodeVec[ pind ];
348 nodes[ nodes.size()-j ] = node;
351 if ( node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_3DSPACE )
353 const PointGeomInfo& pgi = elem.GeomInfoPi(j);
354 meshDS->SetNodeOnFace((SMDS_MeshNode*)node, faceID, pgi.u, pgi.v);
357 if ( j > elem.GetNP() )
359 SMDS_MeshFace* face = 0;
360 if ( elem.GetType() == TRIG )
361 face = helper.AddFace(nodes[0],nodes[1],nodes[2]);
363 face = helper.AddFace(nodes[0],nodes[1],nodes[2],nodes[3]);
367 ngLib._isComputeOk = !err;
371 void NETGENPlugin_NETGEN_2D_ONLY::CancelCompute()
373 SMESH_Algo::CancelCompute();
374 netgen::multithread.terminate = 1;
377 //================================================================================
379 * \brief Return progress of Compute() [0.,1]
381 //================================================================================
383 double NETGENPlugin_NETGEN_2D_ONLY::GetProgress() const
385 const char* task1 = "Surface meshing";
386 const char* task2 = "Optimizing surface";
388 if ( _isSurfaceMeshing &&
389 strncmp( netgen::multithread.task, task1, 3 ) == 0 )
391 res = 0.3 * SMESH_Algo::GetProgressByTic(); // [0, 0.3]
393 else //if ( strncmp( netgen::multithread.task, task2, 3 ) == 0)
395 if ( _isSurfaceMeshing )
397 NETGENPlugin_NETGEN_2D_ONLY* me = (NETGENPlugin_NETGEN_2D_ONLY*) this;
398 me->_isSurfaceMeshing = false;
399 me->_progressTic = 0; // to re-start GetProgressByTic() from 0.
401 res = 0.3 + 0.7 * SMESH_Algo::GetProgressByTic(); // [0.3, 1.]
403 //cout << netgen::multithread.task << " " <<res << endl;
407 //=============================================================================
411 //=============================================================================
413 bool NETGENPlugin_NETGEN_2D_ONLY::Evaluate(SMESH_Mesh& aMesh,
414 const TopoDS_Shape& aShape,
415 MapShapeNbElems& aResMap)
417 TopoDS_Face F = TopoDS::Face(aShape);
421 // collect info from edges
422 int nb0d = 0, nb1d = 0;
423 bool IsQuadratic = false;
425 double fullLen = 0.0;
426 TopTools_MapOfShape tmpMap;
427 for (TopExp_Explorer exp(F, TopAbs_EDGE); exp.More(); exp.Next()) {
428 TopoDS_Edge E = TopoDS::Edge(exp.Current());
429 if( tmpMap.Contains(E) )
432 SMESH_subMesh *aSubMesh = aMesh.GetSubMesh(exp.Current());
433 MapShapeNbElemsItr anIt = aResMap.find(aSubMesh);
434 if( anIt==aResMap.end() ) {
435 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
436 SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
437 smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,"Submesh can not be evaluated",this));
440 std::vector<int> aVec = (*anIt).second;
441 nb0d += aVec[SMDSEntity_Node];
442 nb1d += Max(aVec[SMDSEntity_Edge],aVec[SMDSEntity_Quad_Edge]);
443 double aLen = SMESH_Algo::EdgeLength(E);
446 IsQuadratic = (aVec[SMDSEntity_Quad_Edge] > aVec[SMDSEntity_Edge]);
452 // compute edge length
454 if (_hypLengthFromEdges || !_hypLengthFromEdges && !_hypMaxElementArea) {
456 ELen = fullLen / nb1d;
458 if ( _hypMaxElementArea ) {
459 double maxArea = _hypMaxElementArea->GetMaxArea();
460 ELen = sqrt(2. * maxArea/sqrt(3.0));
463 BRepGProp::SurfaceProperties(F,G);
464 double anArea = G.Mass();
466 const int hugeNb = numeric_limits<int>::max()/10;
467 if ( anArea / hugeNb > ELen*ELen )
469 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
470 SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
471 smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,"Submesh can not be evaluated.\nToo small element length",this));
474 int nbFaces = (int) ( anArea / ( ELen*ELen*sqrt(3.) / 4 ) );
475 int nbNodes = (int) ( ( nbFaces*3 - (nb1d-1)*2 ) / 6 + 1 );
476 std::vector<int> aVec(SMDSEntity_Last);
477 for(int i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i]=0;
479 aVec[SMDSEntity_Node] = nbNodes;
480 aVec[SMDSEntity_Quad_Triangle] = nbFaces;
483 aVec[SMDSEntity_Node] = nbNodes;
484 aVec[SMDSEntity_Triangle] = nbFaces;
486 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
487 aResMap.insert(std::make_pair(sm,aVec));