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PAL10500. Take care of degenerated edges

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This commit is contained in:
eap 2005-11-16 06:52:27 +00:00
parent e14394313c
commit 494eae7646
1 changed files with 48 additions and 17 deletions
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65
src/NETGENPlugin/NETGENPlugin_NETGEN_3D.cxx
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@ -13,12 +13,12 @@ using namespace std;
#include "SMESH_Gen.hxx"
#include "SMESH_Mesh.hxx"
#include "SMESH_ControlsDef.hxx"
#include "SMESHDS_Mesh.hxx"
#include "SMDS_MeshElement.hxx"
#include "SMDS_MeshNode.hxx"
#include <TopExp.hxx>
#include <BRep_Tool.hxx>
#include "utilities.h"
@ -44,9 +44,7 @@ NETGENPlugin_NETGEN_3D::NETGENPlugin_NETGEN_3D(int hypId, int studyId,
{
MESSAGE("NETGENPlugin_NETGEN_3D::NETGENPlugin_NETGEN_3D");
_name = "NETGEN_3D";
// _shapeType = TopAbs_SOLID;
_shapeType = (1 << TopAbs_SHELL) | (1 << TopAbs_SOLID);// 1 bit /shape type
// MESSAGE("_shapeType octal " << oct << _shapeType);
_compatibleHypothesis.push_back("MaxElementVolume");
_maxElementVolume = 0.;
@ -127,6 +125,8 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh& aMesh,
SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
const int invalid_ID = -1;
// -------------------------------------------------------------------
// get triangles on aShell and make a map of nodes to Netgen node IDs
// -------------------------------------------------------------------
@ -136,8 +136,11 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh& aMesh,
list< const SMDS_MeshElement* > triangles;
list< bool > isReversed; // orientation of triangles
SMESH::Controls::Area areaControl;
SMESH::Controls::TSequenceOfXYZ nodesCoords;
// for the degeneraged edge: ignore all but one node on it;
// map storing ids of degen edges and vertices and their netgen id:
map< int, int* > degenShapeIdToPtrNgId;
map< int, int* >::iterator shId_ngId;
list< int > degenNgIds;
for (TopExp_Explorer exp(aShape,TopAbs_FACE);exp.More();exp.Next())
{
@ -165,16 +168,24 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh& aMesh,
while ( triangleNodesIt->more() ) {
const SMDS_MeshNode * node =
static_cast<const SMDS_MeshNode *>(triangleNodesIt->next());
nodeToNetgenID.insert( make_pair( node, 0 ));
nodeToNetgenID.insert( make_pair( node, invalid_ID ));
}
#ifdef _DEBUG_
// check if a trainge is degenerated
areaControl.GetPoints( elem, nodesCoords );
double area = areaControl.GetValue( nodesCoords );
if ( area <= DBL_MIN ) {
MESSAGE( "Warning: Degenerated " << elem );
}
// look for degeneraged edges and vetices
for (TopExp_Explorer expE(aShapeFace,TopAbs_EDGE);expE.More();expE.Next())
{
TopoDS_Edge aShapeEdge = TopoDS::Edge( expE.Current() );
if ( BRep_Tool::Degenerated( aShapeEdge ))
{
degenNgIds.push_back( invalid_ID );
int* ptrIdOnEdge = & degenNgIds.back();
// remember edge id
int edgeID = meshDS->ShapeToIndex( aShapeEdge );
degenShapeIdToPtrNgId.insert( make_pair( edgeID, ptrIdOnEdge ));
// remember vertex id
int vertexID = meshDS->ShapeToIndex( TopExp::FirstVertex( aShapeEdge ));
degenShapeIdToPtrNgId.insert( make_pair( vertexID, ptrIdOnEdge ));
}
#endif
}
}
}
@ -182,7 +193,7 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh& aMesh,
// Feed the Netgen with surface mesh
// ---------------------------------
int Netgen_NbOfNodes = nodeToNetgenID.size();
int Netgen_NbOfNodes = 0;
int Netgen_param2ndOrder = 0;
double Netgen_paramFine = 1.;
double Netgen_paramSize = _maxElementVolume;
@ -196,15 +207,30 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh& aMesh,
Ng_Mesh * Netgen_mesh = Ng_NewMesh();
// set nodes and remember thier netgen IDs
bool isDegen = false, hasDegen = !degenShapeIdToPtrNgId.empty();
TNodeToIDMap::iterator n_id = nodeToNetgenID.begin();
for ( int id = 0; n_id != nodeToNetgenID.end(); ++n_id )
for ( ; n_id != nodeToNetgenID.end(); ++n_id )
{
const SMDS_MeshNode* node = n_id->first;
// ignore nodes on degenerated edge
if ( hasDegen ) {
int shapeId = node->GetPosition()->GetShapeId();
shId_ngId = degenShapeIdToPtrNgId.find( shapeId );
isDegen = ( shId_ngId != degenShapeIdToPtrNgId.end() );
if ( isDegen && *(shId_ngId->second) != invalid_ID ) {
n_id->second = *(shId_ngId->second);
continue;
}
}
Netgen_point [ 0 ] = node->X();
Netgen_point [ 1 ] = node->Y();
Netgen_point [ 2 ] = node->Z();
n_id->second = ++id;
Ng_AddPoint(Netgen_mesh, Netgen_point);
n_id->second = ++Netgen_NbOfNodes; // set netgen ID
if ( isDegen ) // all nodes on a degen edge get one netgen ID
*(shId_ngId->second) = n_id->second;
}
// set triangles
list< const SMDS_MeshElement* >::iterator tria = triangles.begin();
@ -219,7 +245,12 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh& aMesh,
Netgen_triangle[ *reverse ? 2 - i : i ] = nodeToNetgenID[ node ];
++i;
}
Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
if ( !hasDegen ||
// ignore degenerated triangles, they have 2 or 3 same ids
(Netgen_triangle[0] != Netgen_triangle[1] &&
Netgen_triangle[0] != Netgen_triangle[2] &&
Netgen_triangle[2] != Netgen_triangle[1] ))
Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
}
// -------------------------