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NETGENPlugin_NETGEN_2D_ONLY.cpp
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NETGENPlugin_NETGEN_2D_ONLY.cpp
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// Copyright (C) 2007-2008 CEA/DEN, EDF R&D, OPEN CASCADE
//
// Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//
// File : NETGENPlugin_NETGEN_2D_ONLY.cxx
// Author : Edward AGAPOV (OCC)
// Project : SALOME
//
#include "NETGENPlugin_NETGEN_2D_ONLY.hxx"
#include "NETGENPlugin_Mesher.hxx"
#include "SMDS_MeshElement.hxx"
#include "SMDS_MeshNode.hxx"
#include "SMESHDS_Mesh.hxx"
#include "SMESH_Comment.hxx"
#include "SMESH_Gen.hxx"
#include "SMESH_Mesh.hxx"
#include "SMESH_MesherHelper.hxx"
#include "StdMeshers_FaceSide.hxx"
#include "StdMeshers_MaxElementArea.hxx"
#include "StdMeshers_LengthFromEdges.hxx"
#include "StdMeshers_QuadranglePreference.hxx"
#include <Standard_ErrorHandler.hxx>
#include <Standard_Failure.hxx>
#include "utilities.h"
#include <list>
#include <vector>
/*
Netgen include files
*/
namespace nglib {
#include <nglib.h>
}
#define OCCGEOMETRY
#include <occgeom.hpp>
#include <meshing.hpp>
//#include <meshtype.hpp>
namespace netgen {
#ifdef NETGEN_V5
DLL_HEADER extern int OCCGenerateMesh (OCCGeometry&, Mesh*&, MeshingParameters&, int, int);
#else
DLL_HEADER extern int OCCGenerateMesh (OCCGeometry&, Mesh*&, int, int, char*);
#endif
DLL_HEADER extern MeshingParameters mparam;
}
using namespace std;
using namespace netgen;
using namespace nglib;
//=============================================================================
/*!
*
*/
//=============================================================================
NETGENPlugin_NETGEN_2D_ONLY::NETGENPlugin_NETGEN_2D_ONLY(int hypId, int studyId,
SMESH_Gen* gen)
: SMESH_2D_Algo(hypId, studyId, gen)
{
MESSAGE("NETGENPlugin_NETGEN_2D_ONLY::NETGENPlugin_NETGEN_2D_ONLY");
_name = "NETGEN_2D_ONLY";
_shapeType = (1 << TopAbs_FACE);// 1 bit /shape type
_compatibleHypothesis.push_back("MaxElementArea");
_compatibleHypothesis.push_back("LengthFromEdges");
_compatibleHypothesis.push_back("QuadranglePreference");
_hypMaxElementArea = 0;
_hypLengthFromEdges = 0;
_hypQuadranglePreference = 0;
}
//=============================================================================
/*!
*
*/
//=============================================================================
NETGENPlugin_NETGEN_2D_ONLY::~NETGENPlugin_NETGEN_2D_ONLY()
{
MESSAGE("NETGENPlugin_NETGEN_2D_ONLY::~NETGENPlugin_NETGEN_2D_ONLY");
}
//=============================================================================
/*!
*
*/
//=============================================================================
bool NETGENPlugin_NETGEN_2D_ONLY::CheckHypothesis (SMESH_Mesh& aMesh,
const TopoDS_Shape& aShape,
Hypothesis_Status& aStatus)
{
_hypMaxElementArea = 0;
_hypLengthFromEdges = 0;
_hypQuadranglePreference = 0;
const list<const SMESHDS_Hypothesis*>& hyps = GetUsedHypothesis(aMesh, aShape, false);
if (hyps.empty())
{
aStatus = HYP_OK; //SMESH_Hypothesis::HYP_MISSING;
return true; // (PAL13464) can work with no hypothesis, LengthFromEdges is default one
}
aStatus = HYP_MISSING;
list<const SMESHDS_Hypothesis*>::const_iterator ith;
for (ith = hyps.begin(); ith != hyps.end(); ++ith )
{
const SMESHDS_Hypothesis* hyp = (*ith);
string hypName = hyp->GetName();
if ( hypName == "MaxElementArea")
_hypMaxElementArea = static_cast<const StdMeshers_MaxElementArea*> (hyp);
else if ( hypName == "LengthFromEdges" )
_hypLengthFromEdges = static_cast<const StdMeshers_LengthFromEdges*> (hyp);
else if ( hypName == "QuadranglePreference" )
_hypQuadranglePreference = static_cast<const StdMeshers_QuadranglePreference*>(hyp);
else {
aStatus = HYP_INCOMPATIBLE;
return false;
}
}
if ( _hypMaxElementArea && _hypLengthFromEdges ) {
aStatus = HYP_CONCURENT;
return false;
}
if ( _hypMaxElementArea || _hypLengthFromEdges )
aStatus = HYP_OK;
return aStatus == HYP_OK;
}
//================================================================================
/*!
* \brief Fill netgen mesh with segments
* \retval SMESH_ComputeErrorPtr - error description
*/
//================================================================================
static TError AddSegmentsToMesh(netgen::Mesh& ngMesh,
OCCGeometry& geom,
const TSideVector& wires,
SMESH_MesherHelper& helper,
vector< const SMDS_MeshNode* > & nodeVec)
{
// ----------------------------
// Check wires and count nodes
// ----------------------------
int nbNodes = 0;
for ( int iW = 0; iW < wires.size(); ++iW )
{
StdMeshers_FaceSidePtr wire = wires[ iW ];
if ( wire->MissVertexNode() )
return TError
(new SMESH_ComputeError(COMPERR_BAD_INPUT_MESH, "Missing nodes on vertices"));
const vector<UVPtStruct>& uvPtVec = wire->GetUVPtStruct();
if ( uvPtVec.size() != wire->NbPoints() )
return TError
(new SMESH_ComputeError(COMPERR_BAD_INPUT_MESH,
SMESH_Comment("Unexpected nb of points on wire ") << iW
<< ": " << uvPtVec.size()<<" != "<<wire->NbPoints()));
nbNodes += wire->NbSegments();
}
nodeVec.reserve( nbNodes );
// -----------------
// Fill netgen mesh
// -----------------
// netgen::Box<3> bb = geom.GetBoundingBox();
// bb.Increase (bb.Diam()/10);
// ngMesh.SetLocalH (bb.PMin(), bb.PMax(), 0.5); // set grading
const int faceID = 1, solidID = 0;
ngMesh.AddFaceDescriptor (FaceDescriptor(faceID, solidID, solidID, 0));
for ( int iW = 0; iW < wires.size(); ++iW )
{
StdMeshers_FaceSidePtr wire = wires[ iW ];
const vector<UVPtStruct>& uvPtVec = wire->GetUVPtStruct();
int firstPointID = ngMesh.GetNP() + 1;
int edgeID = 1, posID = -2;
for ( int i = 0; i < wire->NbSegments(); ++i ) // loop on segments
{
// Add the first point of a segment
const SMDS_MeshNode * n = uvPtVec[ i ].node;
const int posShapeID = n->GetPosition()->GetShapeId();
// skip nodes on degenerated edges
if ( helper.IsDegenShape( posShapeID ) &&
helper.IsDegenShape( uvPtVec[ i+1 ].node->GetPosition()->GetShapeId() ))
continue;
nodeVec.push_back( n );
MeshPoint mp( Point<3> (n->X(), n->Y(), n->Z()) );
ngMesh.AddPoint ( mp, 1, EDGEPOINT );
// Add the segment
Segment seg;
seg.pnums[0] = ngMesh.GetNP(); // ng node id
seg.pnums[1] = seg.pnums[0] + 1; // ng node id
seg.edgenr = ngMesh.GetNSeg() + 1;// segment id
seg.si = faceID; // = geom.fmap.FindIndex (face);
for ( int iEnd = 0; iEnd < 2; ++iEnd)
{
const UVPtStruct& pnt = uvPtVec[ i + iEnd ];
seg.epgeominfo[ iEnd ].dist = pnt.param; // param on curve
seg.epgeominfo[ iEnd ].u = pnt.u;
seg.epgeominfo[ iEnd ].v = pnt.v;
// find out edge id and node parameter on edge
bool onVertex = ( pnt.node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_VERTEX );
if ( onVertex || posShapeID != posID )
{
// get edge id
double normParam = pnt.normParam;
if ( onVertex )
normParam = 0.5 * ( uvPtVec[ i ].normParam + uvPtVec[ i+1 ].normParam );
const TopoDS_Edge& edge = wire->Edge( wire->EdgeIndex( normParam ));
edgeID = geom.emap.FindIndex( edge );
posID = posShapeID;
if ( onVertex ) // param on curve is different on each of two edges
seg.epgeominfo[ iEnd ].dist = helper.GetNodeU( edge, pnt.node );
}
seg.epgeominfo[ iEnd ].edgenr = edgeID; // = geom.emap.FindIndex(edge);
}
ngMesh.AddSegment (seg);
// cout << "Segment: " << seg.edgenr << endl
// << "\tp1: " << seg.p1 << endl
// << "\tp2: " << seg.p2 << endl
// << "\tp0 param: " << seg.epgeominfo[ 0 ].dist << endl
// << "\tp0 uv: " << seg.epgeominfo[ 0 ].u <<", "<< seg.epgeominfo[ 0 ].v << endl
// << "\tp0 edge: " << seg.epgeominfo[ 0 ].edgenr << endl
// << "\tp1 param: " << seg.epgeominfo[ 1 ].dist << endl
// << "\tp1 uv: " << seg.epgeominfo[ 1 ].u <<", "<< seg.epgeominfo[ 1 ].v << endl
// << "\tp1 edge: " << seg.epgeominfo[ 1 ].edgenr << endl;
}
Segment& seg = ngMesh.LineSegment( ngMesh.GetNSeg() );
seg.pnums[1] = firstPointID;
}
ngMesh.CalcSurfacesOfNode();
return TError();
}
//=============================================================================
/*!
*Here we are going to use the NETGEN mesher
*/
//=============================================================================
bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh& aMesh,
const TopoDS_Shape& aShape)
{
MESSAGE("NETGENPlugin_NETGEN_2D_ONLY::Compute()");
SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
int faceID = meshDS->ShapeToIndex( aShape );
SMESH_MesherHelper helper(aMesh);
_quadraticMesh = helper.IsQuadraticSubMesh(aShape);
helper.SetElementsOnShape( true );
const bool ignoreMediumNodes = _quadraticMesh;
// ------------------------
// get all edges of a face
// ------------------------
const TopoDS_Face F = TopoDS::Face( aShape.Oriented( TopAbs_FORWARD ));
TError problem;
TSideVector wires = StdMeshers_FaceSide::GetFaceWires( F, aMesh, ignoreMediumNodes, problem );
if ( problem && !problem->IsOK() )
return error( problem );
int nbWires = wires.size();
if ( nbWires == 0 )
return error( "Problem in StdMeshers_FaceSide::GetFaceWires()");
if ( wires[0]->NbSegments() < 3 ) // ex: a circle with 2 segments
return error(COMPERR_BAD_INPUT_MESH,
SMESH_Comment("Too few segments: ")<<wires[0]->NbSegments());
// -------------------------
// Make input netgen mesh
// -------------------------
Ng_Init();
netgen::Mesh * ngMesh = new netgen::Mesh ();
netgen::OCCGeometry occgeo;
NETGENPlugin_Mesher::PrepareOCCgeometry( occgeo, F, aMesh );
occgeo.fmap.Clear(); // face can be reversed, which is wrong in this case (issue 19978)
occgeo.fmap.Add( F );
vector< const SMDS_MeshNode* > nodeVec;
problem = AddSegmentsToMesh( *ngMesh, occgeo, wires, helper, nodeVec );
if ( problem && !problem->IsOK() ) {
delete ngMesh; Ng_Exit();
return error( problem );
}
// --------------------
// compute edge length
// --------------------
double edgeLength = 0;
if (_hypLengthFromEdges || (!_hypLengthFromEdges && !_hypMaxElementArea))
{
int nbSegments = 0;
for ( int iW = 0; iW < nbWires; ++iW )
{
edgeLength += wires[ iW ]->Length();
nbSegments += wires[ iW ]->NbSegments();
}
if ( nbSegments )
edgeLength /= nbSegments;
}
if ( _hypMaxElementArea )
{
double maxArea = _hypMaxElementArea->GetMaxArea();
edgeLength = sqrt(2. * maxArea/sqrt(3.0));
}
if ( edgeLength < DBL_MIN )
edgeLength = occgeo.GetBoundingBox().Diam();
//cout << " edgeLength = " << edgeLength << endl;
netgen::mparam.maxh = edgeLength;
netgen::mparam.quad = _hypQuadranglePreference ? 1 : 0;
//ngMesh->SetGlobalH ( edgeLength );
// -------------------------
// Generate surface mesh
// -------------------------
char *optstr = 0;
int startWith = MESHCONST_MESHSURFACE;
int endWith = MESHCONST_OPTSURFACE;
int err = 1;
try {
#if (OCC_VERSION_MAJOR << 16 | OCC_VERSION_MINOR << 8 | OCC_VERSION_MAINTENANCE) > 0x060100
OCC_CATCH_SIGNALS;
#endif
#ifdef NETGEN_V5
err = netgen::OCCGenerateMesh(occgeo, ngMesh,netgen::mparam, startWith, endWith);
#else
err = netgen::OCCGenerateMesh(occgeo, ngMesh, startWith, endWith, optstr);
#endif
}
catch (Standard_Failure& ex) {
string comment = ex.DynamicType()->Name();
if ( ex.GetMessageString() && strlen( ex.GetMessageString() )) {
comment += ": ";
comment += ex.GetMessageString();
}
error(COMPERR_OCC_EXCEPTION, comment);
}
catch (NgException exc) {
error( SMESH_Comment("NgException: ") << exc.What() );
}
catch (...) {
error(COMPERR_EXCEPTION,"Exception in netgen::OCCGenerateMesh()");
}
// ----------------------------------------------------
// Fill the SMESHDS with the generated nodes and faces
// ----------------------------------------------------
int nbNodes = ngMesh->GetNP();
int nbFaces = ngMesh->GetNSE();
int nbInputNodes = nodeVec.size();
nodeVec.resize( nbNodes, 0 );
// add nodes
for ( int i = nbInputNodes + 1; i <= nbNodes; ++i )
{
const MeshPoint& ngPoint = ngMesh->Point(i);
SMDS_MeshNode * node = meshDS->AddNode(ngPoint(0), ngPoint(1), ngPoint(2));
nodeVec[ i-1 ] = node;
}
// create faces
bool reverse = ( aShape.Orientation() == TopAbs_REVERSED );
for ( int i = 1; i <= nbFaces ; ++i )
{
const Element2d& elem = ngMesh->SurfaceElement(i);
vector<const SMDS_MeshNode*> nodes( elem.GetNP() );
for (int j=1; j <= elem.GetNP(); ++j)
{
int pind = elem.PNum(j);
const SMDS_MeshNode* node = nodeVec.at(pind-1);
if ( reverse )
nodes[ nodes.size()-j ] = node;
else
nodes[ j-1 ] = node;
if ( node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_3DSPACE )
{
const PointGeomInfo& pgi = elem.GeomInfoPi(j);
meshDS->SetNodeOnFace((SMDS_MeshNode*)node, faceID, pgi.u, pgi.v);
}
}
SMDS_MeshFace* face = 0;
if ( elem.GetType() == TRIG )
face = helper.AddFace(nodes[0],nodes[1],nodes[2]);
else
face = helper.AddFace(nodes[0],nodes[1],nodes[2],nodes[3]);
}
Ng_DeleteMesh((nglib::Ng_Mesh*)ngMesh);
Ng_Exit();
NETGENPlugin_Mesher::RemoveTmpFiles();
return !err;
}