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020749: EDF 1291 SMESH : Create 2D Mesh from 3D improvement / note 0011031

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-  bool IsFreeFace(  int faceIndex );
+  bool IsFreeFace(  int faceIndex, const SMDS_MeshElement** otherVol=0 );
This commit is contained in:
eap 2011-06-15 10:59:57 +00:00
parent 101f6ec1bf
commit 8f1b298533
2 changed files with 83 additions and 59 deletions
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139
src/SMDS/SMDS_VolumeTool.cxx
View File

@ -1355,20 +1355,23 @@ int SMDS_VolumeTool::GetAllExistingEdges(vector<const SMDS_MeshElement*> & edges
return edges.size();
}
//=======================================================================
//function : IsFreeFace
//purpose : check that only one volume is build on the face nodes
//=======================================================================
//================================================================================
/*!
* \brief check that only one volume is build on the face nodes
*
* If a face is shared by one of <ignoreVolumes>, it is considered free
*/
//================================================================================
bool SMDS_VolumeTool::IsFreeFace( int faceIndex )
bool SMDS_VolumeTool::IsFreeFace( int faceIndex, const SMDS_MeshElement** otherVol/*=0*/ )
{
const int free = true;
const bool isFree = true;
if (!setFace( faceIndex ))
return !free;
return !isFree;
const SMDS_MeshNode** nodes = GetFaceNodes( faceIndex );
int nbFaceNodes = myFaceNbNodes;
const int nbFaceNodes = myFaceNbNodes;
// evaluate nb of face nodes shared by other volume
int maxNbShared = -1;
@ -1377,25 +1380,19 @@ bool SMDS_VolumeTool::IsFreeFace( int faceIndex )
TElemIntMap::iterator vNbIt;
for ( int iNode = 0; iNode < nbFaceNodes; iNode++ ) {
const SMDS_MeshNode* n = nodes[ iNode ];
SMDS_ElemIteratorPtr eIt = n->GetInverseElementIterator();
SMDS_ElemIteratorPtr eIt = n->GetInverseElementIterator( SMDSAbs_Volume );
while ( eIt->more() ) {
const SMDS_MeshElement* elem = eIt->next();
if ( elem != myVolume && elem->GetType() == SMDSAbs_Volume ) {
int nbShared = 1;
vNbIt = volNbShared.find( elem );
if ( vNbIt == volNbShared.end() ) {
volNbShared.insert ( TElemIntMap::value_type( elem, nbShared ));
}
else {
nbShared = ++(*vNbIt).second;
}
if ( nbShared > maxNbShared )
maxNbShared = nbShared;
if ( elem != myVolume ) {
vNbIt = volNbShared.insert( make_pair( elem, 0 )).first;
(*vNbIt).second++;
if ( vNbIt->second > maxNbShared )
maxNbShared = vNbIt->second;
}
}
}
if ( maxNbShared < 3 )
return free; // is free
return isFree; // is free
// find volumes laying on the opposite side of the face
// and sharing all nodes
@ -1404,55 +1401,81 @@ bool SMDS_VolumeTool::IsFreeFace( int faceIndex )
if ( IsFaceExternal( faceIndex ))
intNormal = XYZ( -intNormal.x, -intNormal.y, -intNormal.z );
XYZ p0 ( nodes[0] ), baryCenter;
for ( vNbIt = volNbShared.begin(); vNbIt != volNbShared.end(); vNbIt++ ) {
int nbShared = (*vNbIt).second;
for ( vNbIt = volNbShared.begin(); vNbIt != volNbShared.end(); ) {
const int& nbShared = (*vNbIt).second;
if ( nbShared >= 3 ) {
SMDS_VolumeTool volume( (*vNbIt).first );
volume.GetBaryCenter( baryCenter.x, baryCenter.y, baryCenter.z );
XYZ intNormal2( baryCenter - p0 );
if ( intNormal.Dot( intNormal2 ) < 0 )
continue; // opposite side
if ( intNormal.Dot( intNormal2 ) < 0 ) {
// opposite side
if ( nbShared >= nbFaceNodes )
{
// a volume shares the whole facet
if ( otherVol ) *otherVol = vNbIt->first;
return !isFree;
}
++vNbIt;
continue;
}
}
// remove a volume from volNbShared map
volNbShared.erase( vNbIt-- );
volNbShared.erase( vNbIt++ );
}
// here volNbShared contains only volumes laying on the
// opposite side of the face
if ( volNbShared.empty() ) {
return free; // is free
// here volNbShared contains only volumes laying on the opposite side of
// the face and sharing 3 or more but not all face nodes with myVolume
if ( volNbShared.size() < 2 ) {
return isFree; // is free
}
// check if the whole area of a face is shared
bool isShared[] = { false, false, false, false }; // 4 triangle parts of a quadrangle
for ( vNbIt = volNbShared.begin(); vNbIt != volNbShared.end(); vNbIt++ ) {
SMDS_VolumeTool volume( (*vNbIt).first );
bool prevLinkShared = false;
int nbSharedLinks = 0;
for ( int iNode = 0; iNode < nbFaceNodes; iNode++ ) {
bool linkShared = volume.IsLinked( nodes[ iNode ], nodes[ iNode + 1] );
if ( linkShared )
nbSharedLinks++;
if ( linkShared && prevLinkShared &&
volume.IsLinked( nodes[ iNode - 1 ], nodes[ iNode + 1] ))
isShared[ iNode ] = true;
prevLinkShared = linkShared;
}
if ( nbSharedLinks == nbFaceNodes )
return !free; // is not free
if ( nbFaceNodes == 4 ) {
// check traingle parts 1 & 3
if ( isShared[1] && isShared[3] )
return !free; // is not free
// check triangle parts 0 & 2;
// 0 part could not be checked in the loop; check it here
if ( isShared[2] && prevLinkShared &&
volume.IsLinked( nodes[ 0 ], nodes[ 1 ] ) &&
volume.IsLinked( nodes[ 1 ], nodes[ 3 ] ) )
return !free; // is not free
}
for ( int iNode = 0; iNode < nbFaceNodes; iNode++ )
{
const SMDS_MeshNode* n = nodes[ iNode ];
// check if n is shared by one of volumes of volNbShared
bool isShared = false;
SMDS_ElemIteratorPtr eIt = n->GetInverseElementIterator( SMDSAbs_Volume );
while ( eIt->more() && !isShared )
isShared = volNbShared.count( eIt->next() );
if ( !isShared )
return isFree;
}
return free;
if ( otherVol ) *otherVol = volNbShared.begin()->first;
return !isFree;
// if ( !myVolume->IsPoly() )
// {
// bool isShared[] = { false, false, false, false }; // 4 triangle parts of a quadrangle
// for ( vNbIt = volNbShared.begin(); vNbIt != volNbShared.end(); vNbIt++ ) {
// SMDS_VolumeTool volume( (*vNbIt).first );
// bool prevLinkShared = false;
// int nbSharedLinks = 0;
// for ( int iNode = 0; iNode < nbFaceNodes; iNode++ ) {
// bool linkShared = volume.IsLinked( nodes[ iNode ], nodes[ iNode + 1] );
// if ( linkShared )
// nbSharedLinks++;
// if ( linkShared && prevLinkShared &&
// volume.IsLinked( nodes[ iNode - 1 ], nodes[ iNode + 1] ))
// isShared[ iNode ] = true;
// prevLinkShared = linkShared;
// }
// if ( nbSharedLinks == nbFaceNodes )
// return !free; // is not free
// if ( nbFaceNodes == 4 ) {
// // check traingle parts 1 & 3
// if ( isShared[1] && isShared[3] )
// return !free; // is not free
// // check triangle parts 0 & 2;
// // 0 part could not be checked in the loop; check it here
// if ( isShared[2] && prevLinkShared &&
// volume.IsLinked( nodes[ 0 ], nodes[ 1 ] ) &&
// volume.IsLinked( nodes[ 1 ], nodes[ 3 ] ) )
// return !free; // is not free
// }
// }
// }
// return free;
}
//=======================================================================

3
src/SMDS/SMDS_VolumeTool.hxx
View File

@ -160,8 +160,9 @@ class SMDS_EXPORT SMDS_VolumeTool
// Check normal orientation of a face.
// SetExternalNormal() is taken into account.
bool IsFreeFace( int faceIndex );
bool IsFreeFace( int faceIndex, const SMDS_MeshElement** otherVol=0 );
// Check that all volumes built on the face nodes lays on one side
// otherVol returns another volume sharing the given facet
bool GetFaceNormal (int faceIndex, double & X, double & Y, double & Z);
// Return a normal to a face