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PAL10872. Fix aspect ratio for quadrangles

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eap 2005-12-29 15:45:10 +00:00
parent e69e13adbf
commit fa1f85dfe5
1 changed files with 40 additions and 13 deletions
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53
src/Controls/SMESH_Controls.cxx
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@ -254,38 +254,65 @@ SMDSAbs_ElementType MinimumAngle::GetType() const
*/ */
double AspectRatio::GetValue( const TSequenceOfXYZ& P ) double AspectRatio::GetValue( const TSequenceOfXYZ& P )
{ {
// According to "Mesh quality control" by Nadir Bouhamau referring to
// Pascal Jean Frey and Paul-Louis George. Maillages, applications aux elements finis.
// Hermes Science publications, Paris 1999 ISBN 2-7462-0024-4
// See PAL10872
int nbNodes = P.size(); int nbNodes = P.size();
if ( nbNodes != 3 && nbNodes != 4 ) if ( nbNodes < 3 )
return 0; return 0;
// Compute lengths of the sides // Compute lengths of the sides
double aLen[ nbNodes ]; vector< double > aLen (nbNodes);
for ( int i = 0; i < nbNodes - 1; i++ ) for ( int i = 0; i < nbNodes - 1; i++ )
aLen[ i ] = getDistance( P( i + 1 ), P( i + 2 ) ); aLen[ i ] = getDistance( P( i + 1 ), P( i + 2 ) );
aLen[ nbNodes - 1 ] = getDistance( P( 1 ), P( nbNodes ) ); aLen[ nbNodes - 1 ] = getDistance( P( 1 ), P( nbNodes ) );
// Compute aspect ratio // Compute aspect ratio
if ( nbNodes == 3 ) if ( nbNodes == 3 )
{ {
// Q = alfa * h * p / S, where
//
// alfa = sqrt( 3 ) / 6
// h - length of the longest edge
// p - half perimeter
// S - triangle surface
const double alfa = sqrt( 3. ) / 6.;
double maxLen = Max( aLen[ 0 ], Max( aLen[ 1 ], aLen[ 2 ] ) );
double half_perimeter = ( aLen[0] + aLen[1] + aLen[2] ) / 2.;
double anArea = getArea( P( 1 ), P( 2 ), P( 3 ) ); double anArea = getArea( P( 1 ), P( 2 ), P( 3 ) );
if ( anArea <= Precision::Confusion() ) if ( anArea <= Precision::Confusion() )
return 0.; return 0.;
double aMaxLen = Max( aLen[ 0 ], Max( aLen[ 1 ], aLen[ 2 ] ) );
static double aCoef = sqrt( 3. ) / 4;
return aCoef * aMaxLen * aMaxLen / anArea; return alfa * maxLen * half_perimeter / anArea;
} }
else else
{ {
double aMinLen = Min( Min( aLen[ 0 ], aLen[ 1 ] ), Min( aLen[ 2 ], aLen[ 3 ] ) ); // return aspect ratio of the worst triange which can be built
if ( aMinLen <= Precision::Confusion() ) // taking three nodes of the quadrangle
return 0.; TSequenceOfXYZ triaPnts(3);
double aMaxLen = Max( Max( aLen[ 0 ], aLen[ 1 ] ), Max( aLen[ 2 ], aLen[ 3 ] ) ); // triangle on nodes 1 3 2
triaPnts(1) = P(1);
return aMaxLen / aMinLen; triaPnts(2) = P(3);
triaPnts(3) = P(2);
double ar = GetValue( triaPnts );
// triangle on nodes 1 3 4
triaPnts(3) = P(4);
ar = Max ( ar, GetValue( triaPnts ));
// triangle on nodes 1 2 4
triaPnts(2) = P(2);
ar = Max ( ar, GetValue( triaPnts ));
// triangle on nodes 3 2 4
triaPnts(1) = P(3);
ar = Max ( ar, GetValue( triaPnts ));
return ar;
} }
} }
@ -1116,7 +1143,7 @@ void MultiConnection2D::GetValues(MValues& theValues){
SMDS_FaceIteratorPtr anIter = myMesh->facesIterator(); SMDS_FaceIteratorPtr anIter = myMesh->facesIterator();
for(; anIter->more(); ){ for(; anIter->more(); ){
const SMDS_MeshFace* anElem = anIter->next(); const SMDS_MeshFace* anElem = anIter->next();
long anElemId = anElem->GetID(); //long anElemId = anElem->GetID();
SMDS_ElemIteratorPtr aNodesIter = anElem->nodesIterator(); SMDS_ElemIteratorPtr aNodesIter = anElem->nodesIterator();
long aNodeId[3]; long aNodeId[3];