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;
132 const list<const SMESHDS_Hypothesis*>& hyps = GetUsedHypothesis(aMesh, aShape, false);
136 aStatus = HYP_OK; //SMESH_Hypothesis::HYP_MISSING;
137 return true; // (PAL13464) can work with no hypothesis, LengthFromEdges is default one
140 aStatus = HYP_MISSING;
142 list<const SMESHDS_Hypothesis*>::const_iterator ith;
143 for (ith = hyps.begin(); ith != hyps.end(); ++ith )
145 const SMESHDS_Hypothesis* hyp = (*ith);
147 string hypName = hyp->GetName();
149 if ( hypName == "MaxElementArea")
150 _hypMaxElementArea = static_cast<const StdMeshers_MaxElementArea*> (hyp);
151 else if ( hypName == "LengthFromEdges" )
152 _hypLengthFromEdges = static_cast<const StdMeshers_LengthFromEdges*> (hyp);
153 else if ( hypName == "QuadranglePreference" )
154 _hypQuadranglePreference = static_cast<const StdMeshers_QuadranglePreference*>(hyp);
155 else if ( hypName == "NETGEN_Parameters_2D" )
156 _hypParameters = static_cast<const NETGENPlugin_Hypothesis_2D*>(hyp);
157 else if ( hypName == StdMeshers_ViscousLayers2D::GetHypType() )
160 aStatus = HYP_INCOMPATIBLE;
165 int nbHyps = bool(_hypMaxElementArea) + bool(_hypLengthFromEdges) + bool(_hypParameters );
167 aStatus = HYP_CONCURENT;
171 return ( aStatus == HYP_OK );
174 //=============================================================================
176 *Here we are going to use the NETGEN mesher
178 //=============================================================================
180 bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh& aMesh,
181 const TopoDS_Shape& aShape)
183 netgen::multithread.terminate = 0;
185 SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
186 int faceID = meshDS->ShapeToIndex( aShape );
188 SMESH_MesherHelper helper(aMesh);
189 _quadraticMesh = helper.IsQuadraticSubMesh(aShape);
190 helper.SetElementsOnShape( true );
191 const bool ignoreMediumNodes = _quadraticMesh;
193 // build viscous layers if required
194 const TopoDS_Face F = TopoDS::Face( aShape/*.Oriented( TopAbs_FORWARD )*/);
195 SMESH_ProxyMesh::Ptr proxyMesh = StdMeshers_ViscousLayers2D::Compute( aMesh, F );
199 // ------------------------
200 // get all edges of a face
201 // ------------------------
204 StdMeshers_FaceSide::GetFaceWires( F, aMesh, ignoreMediumNodes, problem, proxyMesh );
205 if ( problem && !problem->IsOK() )
206 return error( problem );
207 int nbWires = wires.size();
209 return error( "Problem in StdMeshers_FaceSide::GetFaceWires()");
210 if ( wires[0]->NbSegments() < 3 ) // ex: a circle with 2 segments
211 return error(COMPERR_BAD_INPUT_MESH,
212 SMESH_Comment("Too few segments: ")<<wires[0]->NbSegments());
214 // --------------------
215 // compute edge length
216 // --------------------
218 NETGENPlugin_Mesher aMesher( &aMesh, aShape, /*isVolume=*/false);
219 netgen::OCCGeometry occgeo;
220 aMesher.PrepareOCCgeometry( occgeo, F, aMesh );
221 occgeo.fmap.Clear(); // face can be reversed, which is wrong in this case (issue 19978)
222 occgeo.fmap.Add( F );
224 if ( _hypParameters )
226 aMesher.SetParameters(_hypParameters);
230 double edgeLength = 0;
231 if (_hypLengthFromEdges || (!_hypLengthFromEdges && !_hypMaxElementArea))
234 for ( int iW = 0; iW < nbWires; ++iW )
236 edgeLength += wires[ iW ]->Length();
237 nbSegments += wires[ iW ]->NbSegments();
240 edgeLength /= nbSegments;
242 if ( _hypMaxElementArea )
244 double maxArea = _hypMaxElementArea->GetMaxArea();
245 edgeLength = sqrt(2. * maxArea/sqrt(3.0));
247 if ( edgeLength < DBL_MIN )
248 edgeLength = occgeo.GetBoundingBox().Diam();
250 netgen::mparam.maxh = edgeLength;
251 netgen::mparam.minh = aMesher.GetDefaultMinSize( aShape, netgen::mparam.maxh );
252 netgen::mparam.quad = _hypQuadranglePreference ? 1 : 0;
253 netgen::mparam.grading = 0.7; // very coarse mesh by default
255 occgeo.face_maxh = netgen::mparam.maxh;
257 // -------------------------
258 // Make input netgen mesh
259 // -------------------------
261 NETGENPlugin_NetgenLibWrapper ngLib;
262 netgen::Mesh * ngMesh = (netgen::Mesh*) ngLib._ngMesh;
264 Box<3> bb = occgeo.GetBoundingBox();
265 bb.Increase (bb.Diam()/10);
266 ngMesh->SetLocalH (bb.PMin(), bb.PMax(), netgen::mparam.grading);
267 ngMesh->SetGlobalH (netgen::mparam.maxh);
269 vector< const SMDS_MeshNode* > nodeVec;
270 problem = aMesher.AddSegmentsToMesh( *ngMesh, occgeo, wires, helper, nodeVec );
271 if ( problem && !problem->IsOK() )
272 return error( problem );
274 // -------------------------
275 // Generate surface mesh
276 // -------------------------
281 int startWith = MESHCONST_MESHSURFACE;
282 int endWith = MESHCONST_OPTSURFACE;
286 #if (OCC_VERSION_MAJOR << 16 | OCC_VERSION_MINOR << 8 | OCC_VERSION_MAINTENANCE) > 0x060100
290 err = netgen::OCCGenerateMesh(occgeo, ngMesh, netgen::mparam, startWith, endWith);
292 err = netgen::OCCGenerateMesh(occgeo, ngMesh, startWith, endWith, optstr);
294 if(netgen::multithread.terminate)
297 error(SMESH_Comment("Error in netgen::OCCGenerateMesh() at ") << netgen::multithread.task);
299 catch (Standard_Failure& ex)
301 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
302 str << " at " << netgen::multithread.task
303 << ": " << ex.DynamicType()->Name();
304 if ( ex.GetMessageString() && strlen( ex.GetMessageString() ))
305 str << ": " << ex.GetMessageString();
309 SMESH_Comment str("Exception in netgen::OCCGenerateMesh()");
310 str << " at " << netgen::multithread.task;
314 // ----------------------------------------------------
315 // Fill the SMESHDS with the generated nodes and faces
316 // ----------------------------------------------------
318 int nbNodes = ngMesh->GetNP();
319 int nbFaces = ngMesh->GetNSE();
321 int nbInputNodes = nodeVec.size()-1;
322 nodeVec.resize( nbNodes+1, 0 );
325 for ( int ngID = nbInputNodes + 1; ngID <= nbNodes; ++ngID )
327 const MeshPoint& ngPoint = ngMesh->Point( ngID );
328 SMDS_MeshNode * node = meshDS->AddNode(ngPoint(0), ngPoint(1), ngPoint(2));
329 nodeVec[ ngID ] = node;
333 const bool reverse = false; //( aShape.Orientation() == TopAbs_REVERSED );
335 for ( i = 1; i <= nbFaces ; ++i )
337 const Element2d& elem = ngMesh->SurfaceElement(i);
338 vector<const SMDS_MeshNode*> nodes( elem.GetNP() );
339 for (j=1; j <= elem.GetNP(); ++j)
341 int pind = elem.PNum(j);
344 const SMDS_MeshNode* node = nodeVec[ pind ];
346 nodes[ nodes.size()-j ] = node;
349 if ( node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_3DSPACE )
351 const PointGeomInfo& pgi = elem.GeomInfoPi(j);
352 meshDS->SetNodeOnFace((SMDS_MeshNode*)node, faceID, pgi.u, pgi.v);
355 if ( j > elem.GetNP() )
357 SMDS_MeshFace* face = 0;
358 if ( elem.GetType() == TRIG )
359 face = helper.AddFace(nodes[0],nodes[1],nodes[2]);
361 face = helper.AddFace(nodes[0],nodes[1],nodes[2],nodes[3]);
365 ngLib._isComputeOk = !err;
369 void NETGENPlugin_NETGEN_2D_ONLY::CancelCompute()
371 SMESH_Algo::CancelCompute();
372 netgen::multithread.terminate = 1;
375 //=============================================================================
379 //=============================================================================
381 bool NETGENPlugin_NETGEN_2D_ONLY::Evaluate(SMESH_Mesh& aMesh,
382 const TopoDS_Shape& aShape,
383 MapShapeNbElems& aResMap)
385 TopoDS_Face F = TopoDS::Face(aShape);
389 // collect info from edges
390 int nb0d = 0, nb1d = 0;
391 bool IsQuadratic = false;
393 double fullLen = 0.0;
394 TopTools_MapOfShape tmpMap;
395 for (TopExp_Explorer exp(F, TopAbs_EDGE); exp.More(); exp.Next()) {
396 TopoDS_Edge E = TopoDS::Edge(exp.Current());
397 if( tmpMap.Contains(E) )
400 SMESH_subMesh *aSubMesh = aMesh.GetSubMesh(exp.Current());
401 MapShapeNbElemsItr anIt = aResMap.find(aSubMesh);
402 if( anIt==aResMap.end() ) {
403 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
404 SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
405 smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,"Submesh can not be evaluated",this));
408 std::vector<int> aVec = (*anIt).second;
409 nb0d += aVec[SMDSEntity_Node];
410 nb1d += Max(aVec[SMDSEntity_Edge],aVec[SMDSEntity_Quad_Edge]);
411 double aLen = SMESH_Algo::EdgeLength(E);
414 IsQuadratic = (aVec[SMDSEntity_Quad_Edge] > aVec[SMDSEntity_Edge]);
420 // compute edge length
422 if (_hypLengthFromEdges || !_hypLengthFromEdges && !_hypMaxElementArea) {
424 ELen = fullLen / nb1d;
426 if ( _hypMaxElementArea ) {
427 double maxArea = _hypMaxElementArea->GetMaxArea();
428 ELen = sqrt(2. * maxArea/sqrt(3.0));
431 BRepGProp::SurfaceProperties(F,G);
432 double anArea = G.Mass();
434 const int hugeNb = numeric_limits<int>::max()/10;
435 if ( anArea / hugeNb > ELen*ELen )
437 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
438 SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
439 smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,"Submesh can not be evaluated.\nToo small element length",this));
442 int nbFaces = (int) ( anArea / ( ELen*ELen*sqrt(3.) / 4 ) );
443 int nbNodes = (int) ( ( nbFaces*3 - (nb1d-1)*2 ) / 6 + 1 );
444 std::vector<int> aVec(SMDSEntity_Last);
445 for(int i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i]=0;
447 aVec[SMDSEntity_Node] = nbNodes;
448 aVec[SMDSEntity_Quad_Triangle] = nbFaces;
451 aVec[SMDSEntity_Node] = nbNodes;
452 aVec[SMDSEntity_Triangle] = nbFaces;
454 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
455 aResMap.insert(std::make_pair(sm,aVec));