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0020452: EDF 1056 SMESH : 2D Projection Issue /regresion/

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avoid sharp change of Local H caused by short edges
This commit is contained in:
eap 2011-04-25 15:14:58 +00:00
parent fee2e60207
commit eab620651d
1 changed files with 15 additions and 6 deletions
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21
src/NETGENPlugin/NETGENPlugin_NETGEN_2D_ONLY.cxx
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@ -169,7 +169,7 @@ bool NETGENPlugin_NETGEN_2D_ONLY::CheckHypothesis (SMESH_Mesh& aMesh,
*/ */
//================================================================================ //================================================================================
static TError AddSegmentsToMesh(netgen::Mesh& ngMesh, static TError addSegmentsToMesh(netgen::Mesh& ngMesh,
OCCGeometry& geom, OCCGeometry& geom,
const TSideVector& wires, const TSideVector& wires,
SMESH_MesherHelper& helper, SMESH_MesherHelper& helper,
@ -225,6 +225,11 @@ static TError AddSegmentsToMesh(netgen::Mesh& ngMesh,
const vector<UVPtStruct>& uvPtVec = wire->GetUVPtStruct(); const vector<UVPtStruct>& uvPtVec = wire->GetUVPtStruct();
const int nbSegments = wire->NbPoints() - 1; const int nbSegments = wire->NbPoints() - 1;
// compute length of every segment
vector<double> segLen( nbSegments );
for ( int i = 0; i < nbSegments; ++i )
segLen[i] = SMESH_TNodeXYZ( uvPtVec[ i ].node ).Distance( uvPtVec[ i+1 ].node );
int edgeID = 1, posID = -2; int edgeID = 1, posID = -2;
bool isInternalWire = false; bool isInternalWire = false;
for ( int i = 0; i < nbSegments; ++i ) // loop on segments for ( int i = 0; i < nbSegments; ++i ) // loop on segments
@ -295,10 +300,16 @@ static TError AddSegmentsToMesh(netgen::Mesh& ngMesh,
ngMesh.AddSegment (seg); ngMesh.AddSegment (seg);
{ {
// restrict size of elements near the segment
netgen::Point3d ngP1(n->X(), n->Y(), n->Z()); netgen::Point3d ngP1(n->X(), n->Y(), n->Z());
n = uvPtVec[ i+1 ].node; n = uvPtVec[ i+1 ].node;
netgen::Point3d ngP2(n->X(), n->Y(), n->Z()); netgen::Point3d ngP2(n->X(), n->Y(), n->Z());
ngMesh.RestrictLocalH( netgen::Center( ngP1,ngP2), Dist(ngP1,ngP2)); // get an average size of adjacent segments to avoid sharp change of
// element size (regression on issue 0020452, note 0010898)
int iPrev = SMESH_MesherHelper::WrapIndex( i-1, nbSegments );
int iNext = SMESH_MesherHelper::WrapIndex( i+1, nbSegments );
double avgH = ( segLen[ iPrev ] + segLen[ i ] + segLen[ iNext ]) / 3;
ngMesh.RestrictLocalH( netgen::Center( ngP1,ngP2), avgH );
} }
#ifdef DUMP_SEGMENTS #ifdef DUMP_SEGMENTS
cout << "Segment: " << seg.edgenr << endl cout << "Segment: " << seg.edgenr << endl
@ -426,11 +437,9 @@ bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh& aMesh,
if ( edgeLength < DBL_MIN ) if ( edgeLength < DBL_MIN )
edgeLength = occgeo.GetBoundingBox().Diam(); edgeLength = occgeo.GetBoundingBox().Diam();
//cout << " edgeLength = " << edgeLength << endl;
netgen::mparam.maxh = edgeLength; netgen::mparam.maxh = edgeLength;
netgen::mparam.quad = _hypQuadranglePreference ? 1 : 0; netgen::mparam.quad = _hypQuadranglePreference ? 1 : 0;
//ngMesh->SetGlobalH ( edgeLength ); netgen::mparam.grading = 0.7; // very coarse mesh by default
} }
// ------------------------- // -------------------------
@ -446,7 +455,7 @@ bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh& aMesh,
ngMesh->SetGlobalH (netgen::mparam.maxh); ngMesh->SetGlobalH (netgen::mparam.maxh);
vector< const SMDS_MeshNode* > nodeVec; vector< const SMDS_MeshNode* > nodeVec;
problem = AddSegmentsToMesh( *ngMesh, occgeo, wires, helper, nodeVec ); problem = addSegmentsToMesh( *ngMesh, occgeo, wires, helper, nodeVec );
if ( problem && !problem->IsOK() ) if ( problem && !problem->IsOK() )
return error( problem ); return error( problem );