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 // File : NETGENPlugin_NETGEN_2D_ONLY.cxx
23 // Author : Edward AGAPOV (OCC)
26 #include "NETGENPlugin_NETGEN_2D_ONLY.hxx"
28 #include "NETGENPlugin_Mesher.hxx"
30 #include "SMDS_MeshElement.hxx"
31 #include "SMDS_MeshNode.hxx"
32 #include "SMESHDS_Mesh.hxx"
33 #include "SMESH_Comment.hxx"
34 #include "SMESH_Gen.hxx"
35 #include "SMESH_Mesh.hxx"
36 #include "SMESH_MesherHelper.hxx"
37 #include "StdMeshers_FaceSide.hxx"
38 #include "StdMeshers_MaxElementArea.hxx"
39 #include "StdMeshers_LengthFromEdges.hxx"
40 #include "StdMeshers_QuadranglePreference.hxx"
42 #include <Precision.hxx>
43 #include <Standard_ErrorHandler.hxx>
44 #include <Standard_Failure.hxx>
46 #include "utilities.h"
59 #include <occgeom.hpp>
60 #include <meshing.hpp>
61 //#include <meshtype.hpp>
63 extern int OCCGenerateMesh (OCCGeometry&, Mesh*&, int, int, char*);
64 /*extern*/ MeshingParameters mparam;
68 using namespace netgen;
69 using namespace nglib;
71 //=============================================================================
75 //=============================================================================
77 NETGENPlugin_NETGEN_2D_ONLY::NETGENPlugin_NETGEN_2D_ONLY(int hypId, int studyId,
79 : SMESH_2D_Algo(hypId, studyId, gen)
81 MESSAGE("NETGENPlugin_NETGEN_2D_ONLY::NETGENPlugin_NETGEN_2D_ONLY");
82 _name = "NETGEN_2D_ONLY";
84 _shapeType = (1 << TopAbs_FACE);// 1 bit /shape type
86 _compatibleHypothesis.push_back("MaxElementArea");
87 _compatibleHypothesis.push_back("LengthFromEdges");
88 _compatibleHypothesis.push_back("QuadranglePreference");
90 _hypMaxElementArea = 0;
91 _hypLengthFromEdges = 0;
92 _hypQuadranglePreference = 0;
95 //=============================================================================
99 //=============================================================================
101 NETGENPlugin_NETGEN_2D_ONLY::~NETGENPlugin_NETGEN_2D_ONLY()
103 MESSAGE("NETGENPlugin_NETGEN_2D_ONLY::~NETGENPlugin_NETGEN_2D_ONLY");
106 //=============================================================================
110 //=============================================================================
112 bool NETGENPlugin_NETGEN_2D_ONLY::CheckHypothesis (SMESH_Mesh& aMesh,
113 const TopoDS_Shape& aShape,
114 Hypothesis_Status& aStatus)
116 _hypMaxElementArea = 0;
117 _hypLengthFromEdges = 0;
118 _hypQuadranglePreference = 0;
120 const list<const SMESHDS_Hypothesis*>& hyps = GetUsedHypothesis(aMesh, aShape, false);
124 aStatus = HYP_OK; //SMESH_Hypothesis::HYP_MISSING;
125 return true; // (PAL13464) can work with no hypothesis, LengthFromEdges is default one
128 aStatus = HYP_MISSING;
130 list<const SMESHDS_Hypothesis*>::const_iterator ith;
131 for (ith = hyps.begin(); ith != hyps.end(); ++ith )
133 const SMESHDS_Hypothesis* hyp = (*ith);
135 string hypName = hyp->GetName();
137 if ( hypName == "MaxElementArea")
138 _hypMaxElementArea = static_cast<const StdMeshers_MaxElementArea*> (hyp);
139 else if ( hypName == "LengthFromEdges" )
140 _hypLengthFromEdges = static_cast<const StdMeshers_LengthFromEdges*> (hyp);
141 else if ( hypName == "QuadranglePreference" )
142 _hypQuadranglePreference = static_cast<const StdMeshers_QuadranglePreference*>(hyp);
144 aStatus = HYP_INCOMPATIBLE;
149 if ( _hypMaxElementArea && _hypLengthFromEdges ) {
150 aStatus = HYP_CONCURENT;
154 if ( _hypMaxElementArea || _hypLengthFromEdges )
157 return aStatus == HYP_OK;
160 //================================================================================
162 * \brief Fill netgen mesh with segments
163 * \retval SMESH_ComputeErrorPtr - error description
165 //================================================================================
167 static TError AddSegmentsToMesh(netgen::Mesh& ngMesh,
169 const TSideVector& wires,
170 SMESH_MesherHelper& helper,
171 vector< const SMDS_MeshNode* > & nodeVec)
173 // ----------------------------
174 // Check wires and count nodes
175 // ----------------------------
177 for ( int iW = 0; iW < wires.size(); ++iW )
179 StdMeshers_FaceSidePtr wire = wires[ iW ];
180 if ( wire->MissVertexNode() )
182 (new SMESH_ComputeError(COMPERR_BAD_INPUT_MESH, "Missing nodes on vertices"));
184 const vector<UVPtStruct>& uvPtVec = wire->GetUVPtStruct();
185 if ( uvPtVec.size() != wire->NbPoints() )
187 (new SMESH_ComputeError(COMPERR_BAD_INPUT_MESH,
188 SMESH_Comment("Unexpected nb of points on wire ") << iW
189 << ": " << uvPtVec.size()<<" != "<<wire->NbPoints()));
190 nbNodes += wire->NbSegments();
192 nodeVec.reserve( nbNodes );
198 // netgen::Box<3> bb = geom.GetBoundingBox();
199 // bb.Increase (bb.Diam()/10);
200 // ngMesh.SetLocalH (bb.PMin(), bb.PMax(), 0.5); // set grading
202 const int faceID = 1, solidID = 0;
203 ngMesh.AddFaceDescriptor (FaceDescriptor(faceID, solidID, solidID, 0));
205 for ( int iW = 0; iW < wires.size(); ++iW )
207 StdMeshers_FaceSidePtr wire = wires[ iW ];
208 const vector<UVPtStruct>& uvPtVec = wire->GetUVPtStruct();
210 int firstPointID = ngMesh.GetNP() + 1;
211 int edgeID = 1, posID = -2;
212 for ( int i = 0; i < wire->NbSegments(); ++i ) // loop on segments
214 // Add the first point of a segment
215 const SMDS_MeshNode * n = uvPtVec[ i ].node;
216 const int posShapeID = n->GetPosition()->GetShapeId();
218 // skip nodes on degenerated edges
219 if ( helper.IsDegenShape( posShapeID ) &&
220 helper.IsDegenShape( uvPtVec[ i+1 ].node->GetPosition()->GetShapeId() ))
223 nodeVec.push_back( n );
225 MeshPoint mp( Point<3> (n->X(), n->Y(), n->Z()) );
226 ngMesh.AddPoint ( mp, 1, EDGEPOINT );
232 seg.pnums[0] = ngMesh.GetNP(); // ng node id
233 seg.pnums[1] = seg.pnums[0] + 1; // ng node id
235 seg.p1 = ngMesh.GetNP(); // ng node id
236 seg.p2 = seg.p1 + 1; // ng node id
238 seg.edgenr = ngMesh.GetNSeg() + 1;// segment id
239 seg.si = faceID; // = geom.fmap.FindIndex (face);
241 for ( int iEnd = 0; iEnd < 2; ++iEnd)
243 const UVPtStruct& pnt = uvPtVec[ i + iEnd ];
245 seg.epgeominfo[ iEnd ].dist = pnt.param; // param on curve
246 seg.epgeominfo[ iEnd ].u = pnt.u;
247 seg.epgeominfo[ iEnd ].v = pnt.v;
249 // find out edge id and node parameter on edge
250 bool onVertex = ( pnt.node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_VERTEX );
251 if ( onVertex || posShapeID != posID )
254 double normParam = pnt.normParam;
256 normParam = 0.5 * ( uvPtVec[ i ].normParam + uvPtVec[ i+1 ].normParam );
257 const TopoDS_Edge& edge = wire->Edge( wire->EdgeIndex( normParam ));
258 edgeID = geom.emap.FindIndex( edge );
260 if ( onVertex ) // param on curve is different on each of two edges
261 seg.epgeominfo[ iEnd ].dist = helper.GetNodeU( edge, pnt.node );
263 seg.epgeominfo[ iEnd ].edgenr = edgeID; // = geom.emap.FindIndex(edge);
266 ngMesh.AddSegment (seg);
268 // cout << "Segment: " << seg.edgenr << endl
269 // << "\tp1: " << seg.p1 << endl
270 // << "\tp2: " << seg.p2 << endl
271 // << "\tp0 param: " << seg.epgeominfo[ 0 ].dist << endl
272 // << "\tp0 uv: " << seg.epgeominfo[ 0 ].u <<", "<< seg.epgeominfo[ 0 ].v << endl
273 // << "\tp0 edge: " << seg.epgeominfo[ 0 ].edgenr << endl
274 // << "\tp1 param: " << seg.epgeominfo[ 1 ].dist << endl
275 // << "\tp1 uv: " << seg.epgeominfo[ 1 ].u <<", "<< seg.epgeominfo[ 1 ].v << endl
276 // << "\tp1 edge: " << seg.epgeominfo[ 1 ].edgenr << endl;
278 Segment& seg = ngMesh.LineSegment( ngMesh.GetNSeg() );
280 seg.pnums[1] = firstPointID;
282 seg.p2 = firstPointID;
286 ngMesh.CalcSurfacesOfNode();
291 //=============================================================================
293 *Here we are going to use the NETGEN mesher
295 //=============================================================================
297 bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh& aMesh,
298 const TopoDS_Shape& aShape)
300 MESSAGE("NETGENPlugin_NETGEN_2D_ONLY::Compute()");
302 SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
303 int faceID = meshDS->ShapeToIndex( aShape );
305 SMESH_MesherHelper helper(aMesh);
306 _quadraticMesh = helper.IsQuadraticSubMesh(aShape);
307 helper.SetElementsOnShape( true );
308 const bool ignoreMediumNodes = _quadraticMesh;
310 // ------------------------
311 // get all edges of a face
312 // ------------------------
313 const TopoDS_Face F = TopoDS::Face( aShape.Oriented( TopAbs_FORWARD ));
315 TSideVector wires = StdMeshers_FaceSide::GetFaceWires( F, aMesh, ignoreMediumNodes, problem );
316 if ( problem && !problem->IsOK() )
317 return error( problem );
318 int nbWires = wires.size();
320 return error( "Problem in StdMeshers_FaceSide::GetFaceWires()");
321 if ( wires[0]->NbSegments() < 3 ) // ex: a circle with 2 segments
322 return error(COMPERR_BAD_INPUT_MESH,
323 SMESH_Comment("Too few segments: ")<<wires[0]->NbSegments());
325 // -------------------------
326 // Make input netgen mesh
327 // -------------------------
330 netgen::Mesh * ngMesh = new netgen::Mesh ();
332 netgen::OCCGeometry occgeo;
333 NETGENPlugin_Mesher::PrepareOCCgeometry( occgeo, F, aMesh );
334 occgeo.fmap.Clear(); // face can be reversed, which is wrong in this case (issue 19978)
335 occgeo.fmap.Add( F );
337 vector< const SMDS_MeshNode* > nodeVec;
338 problem = AddSegmentsToMesh( *ngMesh, occgeo, wires, helper, nodeVec );
339 if ( problem && !problem->IsOK() ) {
340 delete ngMesh; Ng_Exit();
341 return error( problem );
344 // --------------------
345 // compute edge length
346 // --------------------
348 double edgeLength = 0;
349 if (_hypLengthFromEdges || !_hypLengthFromEdges && !_hypMaxElementArea)
352 for ( int iW = 0; iW < nbWires; ++iW )
354 edgeLength += wires[ iW ]->Length();
355 nbSegments += wires[ iW ]->NbSegments();
358 edgeLength /= nbSegments;
360 if ( _hypMaxElementArea )
362 double maxArea = _hypMaxElementArea->GetMaxArea();
363 edgeLength = sqrt(2. * maxArea/sqrt(3.0));
365 if ( edgeLength < DBL_MIN )
366 edgeLength = occgeo.GetBoundingBox().Diam();
368 //cout << " edgeLength = " << edgeLength << endl;
370 netgen::mparam.maxh = edgeLength;
371 netgen::mparam.quad = _hypQuadranglePreference ? 1 : 0;
372 //ngMesh->SetGlobalH ( edgeLength );
374 // -------------------------
375 // Generate surface mesh
376 // -------------------------
379 int startWith = MESHCONST_MESHSURFACE;
380 int endWith = MESHCONST_OPTSURFACE;
384 #if (OCC_VERSION_MAJOR << 16 | OCC_VERSION_MINOR << 8 | OCC_VERSION_MAINTENANCE) > 0x060100
387 err = netgen::OCCGenerateMesh(occgeo, ngMesh, startWith, endWith, optstr);
389 catch (Standard_Failure& ex) {
390 string comment = ex.DynamicType()->Name();
391 if ( ex.GetMessageString() && strlen( ex.GetMessageString() )) {
393 comment += ex.GetMessageString();
395 error(COMPERR_OCC_EXCEPTION, comment);
397 catch (NgException exc) {
398 error( SMESH_Comment("NgException: ") << exc.What() );
401 error(COMPERR_EXCEPTION,"Exception in netgen::OCCGenerateMesh()");
404 // ----------------------------------------------------
405 // Fill the SMESHDS with the generated nodes and faces
406 // ----------------------------------------------------
408 int nbNodes = ngMesh->GetNP();
409 int nbFaces = ngMesh->GetNSE();
411 int nbInputNodes = nodeVec.size();
412 nodeVec.resize( nbNodes, 0 );
415 for ( int i = nbInputNodes + 1; i <= nbNodes; ++i )
417 const MeshPoint& ngPoint = ngMesh->Point(i);
419 SMDS_MeshNode * node = meshDS->AddNode(ngPoint(0), ngPoint(1), ngPoint(2));
421 SMDS_MeshNode * node = meshDS->AddNode(ngPoint.X(), ngPoint.Y(), ngPoint.Z());
423 nodeVec[ i-1 ] = node;
427 bool reverse = ( aShape.Orientation() == TopAbs_REVERSED );
428 for ( int i = 1; i <= nbFaces ; ++i )
430 const Element2d& elem = ngMesh->SurfaceElement(i);
431 vector<const SMDS_MeshNode*> nodes( elem.GetNP() );
432 for (int j=1; j <= elem.GetNP(); ++j)
434 int pind = elem.PNum(j);
435 const SMDS_MeshNode* node = nodeVec.at(pind-1);
437 nodes[ nodes.size()-j ] = node;
440 if ( node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_3DSPACE )
442 const PointGeomInfo& pgi = elem.GeomInfoPi(j);
443 meshDS->SetNodeOnFace((SMDS_MeshNode*)node, faceID, pgi.u, pgi.v);
446 SMDS_MeshFace* face = 0;
447 if ( elem.GetType() == TRIG )
448 face = helper.AddFace(nodes[0],nodes[1],nodes[2]);
450 face = helper.AddFace(nodes[0],nodes[1],nodes[2],nodes[3]);
453 Ng_DeleteMesh((nglib::Ng_Mesh*)ngMesh);
456 NETGENPlugin_Mesher::RemoveTmpFiles();
462 //=============================================================================
466 //=============================================================================
468 bool NETGENPlugin_NETGEN_2D_ONLY::Evaluate(SMESH_Mesh& aMesh,
469 const TopoDS_Shape& aShape,
470 MapShapeNbElems& aResMap)
472 TopoDS_Face F = TopoDS::Face(aShape);
476 // collect info from edges
477 int nb0d = 0, nb1d = 0;
478 bool IsQuadratic = false;
480 double fullLen = 0.0;
481 TopTools_MapOfShape tmpMap;
482 for (TopExp_Explorer exp(F, TopAbs_EDGE); exp.More(); exp.Next()) {
483 TopoDS_Edge E = TopoDS::Edge(exp.Current());
484 if( tmpMap.Contains(E) )
487 SMESH_subMesh *aSubMesh = aMesh.GetSubMesh(exp.Current());
488 MapShapeNbElemsItr anIt = aResMap.find(aSubMesh);
489 if( anIt==aResMap.end() ) {
490 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
491 SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
492 smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,"Submesh can not be evaluated",this));
495 std::vector<int> aVec = (*anIt).second;
496 nb0d += aVec[SMDSEntity_Node];
497 nb1d += Max(aVec[SMDSEntity_Edge],aVec[SMDSEntity_Quad_Edge]);
498 double aLen = SMESH_Algo::EdgeLength(E);
501 IsQuadratic = (aVec[SMDSEntity_Quad_Edge] > aVec[SMDSEntity_Edge]);
507 // compute edge length
509 if (_hypLengthFromEdges || !_hypLengthFromEdges && !_hypMaxElementArea) {
511 ELen = fullLen / nb1d;
513 if ( _hypMaxElementArea ) {
514 double maxArea = _hypMaxElementArea->GetMaxArea();
515 ELen = sqrt(2. * maxArea/sqrt(3.0));
518 BRepGProp::SurfaceProperties(F,G);
519 double anArea = G.Mass();
521 const int hugeNb = numeric_limits<int>::max()/10;
522 if ( anArea / hugeNb > ELen*ELen )
524 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
525 SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
526 smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,"Submesh can not be evaluated.\nToo small element length",this));
529 int nbFaces = (int) ( anArea / ( ELen*ELen*sqrt(3.) / 4 ) );
530 int nbNodes = (int) ( ( nbFaces*3 - (nb1d-1)*2 ) / 6 + 1 );
531 std::vector<int> aVec(SMDSEntity_Last);
532 for(int i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i]=0;
534 aVec[SMDSEntity_Node] = nbNodes;
535 aVec[SMDSEntity_Quad_Triangle] = nbFaces;
538 aVec[SMDSEntity_Node] = nbNodes;
539 aVec[SMDSEntity_Triangle] = nbFaces;
541 SMESH_subMesh *sm = aMesh.GetSubMesh(F);
542 aResMap.insert(std::make_pair(sm,aVec));