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19296: EDF 681 SMESH - Pre-evaluation of the number of elements before mesh

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protect from negative nbs and FPE
This commit is contained in:
eap 2009-11-16 16:09:50 +00:00
parent 1417e0fd20
commit 5b4d235c85
2 changed files with 61 additions and 40 deletions
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79
src/NETGENPlugin/NETGENPlugin_Mesher.cxx
View File

@ -990,6 +990,9 @@ bool NETGENPlugin_Mesher::Evaluate(MapShapeNbElems& aResMap)
list< SMESH_subMesh* > meshedSM;
PrepareOCCgeometry( occgeo, _shape, *_mesh, &meshedSM );
bool tooManyElems = false;
const int hugeNb = std::numeric_limits<int>::max() / 100;
// ----------------
// evaluate 1D
// ----------------
@ -1017,22 +1020,30 @@ bool NETGENPlugin_Mesher::Evaluate(MapShapeNbElems& aResMap)
if( EdgesMap.IsBound(E) )
continue;
SMESH_subMesh *sm = _mesh->GetSubMesh(E);
std::vector<int> aVec(SMDSEntity_Last, 0);
double aLen = SMESH_Algo::EdgeLength(E);
fullLen += aLen;
int nb1d = nbs;
if(nb1d==0) {
nb1d = (int)( aLen/mparams.maxh + 1 );
tooManyElems = ( aLen/hugeNb > mparams.maxh );
if(nb1d==0 && !tooManyElems) {
nb1d = (int)( aLen/mparams.maxh + 1 );
}
fullNbSeg += nb1d;
std::vector<int> aVec(SMDSEntity_Last);
for(int i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i]=0;
if( mparams.secondorder > 0 ) {
aVec[SMDSEntity_Node] = 2*nb1d - 1;
aVec[SMDSEntity_Quad_Edge] = nb1d;
if ( tooManyElems ) // avoid FPE
{
aVec[SMDSEntity_Node] = hugeNb;
aVec[ mparams.secondorder > 0 ? SMDSEntity_Quad_Edge : SMDSEntity_Edge] = hugeNb;
}
else {
aVec[SMDSEntity_Node] = nb1d - 1;
aVec[SMDSEntity_Edge] = nb1d;
else
{
fullNbSeg += nb1d;
if( mparams.secondorder > 0 ) {
aVec[SMDSEntity_Node] = 2*nb1d - 1;
aVec[SMDSEntity_Quad_Edge] = nb1d;
}
else {
aVec[SMDSEntity_Node] = nb1d - 1;
aVec[SMDSEntity_Edge] = nb1d;
}
}
aResMap.insert(std::make_pair(sm,aVec));
EdgesMap.Bind(E,nb1d);
@ -1054,20 +1065,24 @@ bool NETGENPlugin_Mesher::Evaluate(MapShapeNbElems& aResMap)
}
mparams.maxh = min( mparams.maxh, occgeo.boundingbox.Diam()/2 );
}
for (TopExp_Explorer exp(_shape, TopAbs_FACE); exp.More(); exp.Next()) {
for (TopExp_Explorer exp(_shape, TopAbs_FACE); exp.More(); exp.Next())
{
TopoDS_Face F = TopoDS::Face( exp.Current() );
SMESH_subMesh *sm = _mesh->GetSubMesh(F);
GProp_GProps G;
BRepGProp::SurfaceProperties(F,G);
double anArea = G.Mass();
tooManyElems = tooManyElems || ( anArea/hugeNb > mparams.maxh*mparams.maxh );
int nb1d = 0;
for (TopExp_Explorer exp1(F,TopAbs_EDGE); exp1.More(); exp1.Next()) {
nb1d += EdgesMap.Find(exp1.Current());
}
int nbFaces = (int) ( anArea / ( mparams.maxh*mparams.maxh*sqrt(3.) / 4 ) );
int nbNodes = (int) ( ( nbFaces*3 - (nb1d-1)*2 ) / 6 + 1 );
std::vector<int> aVec(SMDSEntity_Last);
for(int i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i]=0;
if ( !tooManyElems )
for (TopExp_Explorer exp1(F,TopAbs_EDGE); exp1.More(); exp1.Next())
nb1d += EdgesMap.Find(exp1.Current());
int nbFaces = tooManyElems ? hugeNb : int( 4*anArea / mparams.maxh*mparams.maxh*sqrt(3.));
int nbNodes = tooManyElems ? hugeNb : (( nbFaces*3 - (nb1d-1)*2 ) / 6 + 1 );
std::vector<int> aVec(SMDSEntity_Last, 0);
if( mparams.secondorder > 0 ) {
int nb1d_in = (nbFaces*3 - nb1d) / 2;
aVec[SMDSEntity_Node] = nbNodes + nb1d_in;
@ -1102,17 +1117,25 @@ bool NETGENPlugin_Mesher::Evaluate(MapShapeNbElems& aResMap)
BRepGProp::VolumeProperties(_shape,G);
double aVolume = G.Mass();
double tetrVol = 0.1179*mparams.maxh*mparams.maxh*mparams.maxh;
int nbVols = int(aVolume/tetrVol);
tooManyElems = tooManyElems || ( aVolume/hugeNb > tetrVol );
int nbVols = tooManyElems ? hugeNb : int(aVolume/tetrVol);
int nb1d_in = int(( nbVols*6 - fullNbSeg ) / 6 );
std::vector<int> aVec(SMDSEntity_Last);
for(int i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i]=0;
if( mparams.secondorder > 0 ) {
aVec[SMDSEntity_Node] = nb1d_in/3 + 1 + nb1d_in;
aVec[SMDSEntity_Quad_Tetra] = nbVols;
std::vector<int> aVec(SMDSEntity_Last, 0 );
if ( tooManyElems ) // avoid FPE
{
aVec[SMDSEntity_Node] = hugeNb;
aVec[ mparams.secondorder > 0 ? SMDSEntity_Quad_Tetra : SMDSEntity_Tetra] = hugeNb;
}
else {
aVec[SMDSEntity_Node] = nb1d_in/3 + 1;
aVec[SMDSEntity_Tetra] = nbVols;
else
{
if( mparams.secondorder > 0 ) {
aVec[SMDSEntity_Node] = nb1d_in/3 + 1 + nb1d_in;
aVec[SMDSEntity_Quad_Tetra] = nbVols;
}
else {
aVec[SMDSEntity_Node] = nb1d_in/3 + 1;
aVec[SMDSEntity_Tetra] = nbVols;
}
}
SMESH_subMesh *sm = _mesh->GetSubMesh(_shape);
aResMap.insert(std::make_pair(sm,aVec));

22
src/NETGENPlugin/NETGENPlugin_NETGEN_2D_ONLY.cxx
View File

@ -500,21 +500,19 @@ bool NETGENPlugin_NETGEN_2D_ONLY::Evaluate(SMESH_Mesh& aMesh,
double maxArea = _hypMaxElementArea->GetMaxArea();
ELen = sqrt(2. * maxArea/sqrt(3.0));
}
if ( ELen < Precision::Confusion() ) {
SMESH_subMesh *sm = aMesh.GetSubMesh(F);
if ( sm ) {
SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,"Submesh can not be evaluated.\nToo small element length",this));
}
return false;
}
GProp_GProps G;
BRepGProp::SurfaceProperties(F,G);
double anArea = G.Mass();
int nbFaces = 0;
if ( ELen > Precision::Confusion() )
nbFaces = (int) ( anArea / ( ELen*ELen*sqrt(3.) / 4 ) );
const int hugeNb = numeric_limits<int>::max()/10;
if ( anArea / hugeNb > ELen*ELen )
{
SMESH_subMesh *sm = aMesh.GetSubMesh(F);
SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
smError.reset( new SMESH_ComputeError(COMPERR_ALGO_FAILED,"Submesh can not be evaluated.\nToo small element length",this));
return false;
}
int nbFaces = (int) ( anArea / ( ELen*ELen*sqrt(3.) / 4 ) );
int nbNodes = (int) ( ( nbFaces*3 - (nb1d-1)*2 ) / 6 + 1 );
std::vector<int> aVec(SMDSEntity_Last);
for(int i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i]=0;