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bos #29266 EDF 24971 - SALOME crashes
Fix intersecting pyramids by applying gradation 2.0 to pyramids height
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@ -59,6 +59,23 @@ enum EQuadNature { NOT_QUAD, QUAD, DEGEN_QUAD, PYRAM_APEX = 4, TRIA_APEX = 0 };
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// std-like iterator used to get coordinates of nodes of mesh element
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typedef SMDS_StdIterator< SMESH_TNodeXYZ, SMDS_ElemIteratorPtr > TXyzIterator;
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//================================================================================
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/*!
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* \brief Return ID of pyramid base face, for debug
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*/
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//================================================================================
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int getFaceID(const SMDS_MeshElement* pyram)
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{
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if ( pyram )
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if ( const SMDS_MeshElement* f = SMDS_Mesh::FindFace( pyram->GetNode(0),
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pyram->GetNode(1),
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pyram->GetNode(2),
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pyram->GetNode(3)))
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return f->GetID();
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return -1;
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}
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namespace
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{
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//================================================================================
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@ -350,8 +367,6 @@ void StdMeshers_QuadToTriaAdaptor::MergePiramids( const SMDS_MeshElement* Pr
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const SMDS_MeshElement* PrmJ,
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set<const SMDS_MeshNode*> & nodesToMove)
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{
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// cout << endl << "Merge " << PrmI->GetID() << " " << PrmJ->GetID() << " "
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// << PrmI->GetNode(4)->GetID() << " " << PrmJ->GetNode(4)->GetID() << endl;
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const SMDS_MeshNode* Nrem = PrmJ->GetNode(4); // node to remove
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//int nbJ = Nrem->NbInverseElements( SMDSAbs_Volume );
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SMESH_TNodeXYZ Pj( Nrem );
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@ -367,6 +382,8 @@ void StdMeshers_QuadToTriaAdaptor::MergePiramids( const SMDS_MeshElement* Pr
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nodesToMove.insert( CommonNode );
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nodesToMove.erase ( Nrem );
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//cout << "MergePiramids F" << getFaceID( PrmI ) << " - F" << getFaceID( PrmJ ) << endl;
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typedef SMDS_StdIterator< const SMDS_MeshElement*, SMDS_ElemIteratorPtr > TStdElemIterator;
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TStdElemIterator itEnd;
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@ -472,6 +489,61 @@ void StdMeshers_QuadToTriaAdaptor::MergeAdjacent(const SMDS_MeshElement* PrmI
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return;
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}
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//================================================================================
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/*!
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* \brief Decrease height of a given or adjacent pyramids if height difference
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* is too large
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* \param [in] pyram - a pyramid to treat
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* \param [inout] h2 - pyramid's square height
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* \return bool - true if the height changes
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*/
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//================================================================================
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bool StdMeshers_QuadToTriaAdaptor::DecreaseHeightDifference( const SMDS_MeshElement* thePyram,
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const double theH2 )
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{
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const double allowedFactor2 = 2. * 2.;
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bool modif = false;
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myNodes[0] = thePyram->GetNode( 3 );
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for ( int i = 0; i < 4; ++i )
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{
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myNodes[1] = thePyram->GetNode( i );
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SMDS_Mesh::GetElementsByNodes( myNodes, myAdjPyrams, SMDSAbs_Volume );
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myNodes[0] = myNodes[1];
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for ( const SMDS_MeshElement* pyramAdj : myAdjPyrams )
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{
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if ( pyramAdj == thePyram )
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continue;
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if ( !myPyramHeight2.IsBound( pyramAdj ))
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continue;
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double h2Adj = Abs( myPyramHeight2( pyramAdj ));
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double h2 = Abs( theH2 );
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if ( h2Adj > h2 )
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{
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if ( h2 * allowedFactor2 < h2Adj )
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{
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// bind negative value to allow finding pyramids whose height must change
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myPyramHeight2.Bind( pyramAdj, - h2 * allowedFactor2 );
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modif = true;
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}
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}
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else
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{
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if ( h2Adj * allowedFactor2 < h2 )
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{
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// bind negative value to allow finding pyramids whose height must change
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myPyramHeight2.Bind( thePyram, - h2Adj * allowedFactor2 );
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modif = true;
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}
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}
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}
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}
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return modif;
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}
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//================================================================================
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/*!
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* \brief Constructor
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@ -504,9 +576,11 @@ StdMeshers_QuadToTriaAdaptor::~StdMeshers_QuadToTriaAdaptor()
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//=======================================================================
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static gp_Pnt FindBestPoint(const gp_Pnt& P1, const gp_Pnt& P2,
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const gp_Pnt& PC, const gp_Vec& V)
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const gp_Pnt& PC, const gp_Vec& V,
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double & shift)
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{
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gp_Pnt Pbest = PC;
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shift = 0;
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const double a2 = P1.SquareDistance(P2);
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const double b2 = P1.SquareDistance(PC);
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const double c2 = P2.SquareDistance(PC);
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@ -517,7 +591,7 @@ static gp_Pnt FindBestPoint(const gp_Pnt& P1, const gp_Pnt& P2,
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const double Vsize = V.Magnitude();
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if ( fabs( Vsize ) > std::numeric_limits<double>::min() )
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{
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const double shift = sqrt( a2 + (b2-c2)*(b2-c2)/16/a2 - (b2+c2)/2 );
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shift = sqrt( a2 + (b2-c2)*(b2-c2)/16/a2 - (b2+c2)/2 );
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Pbest.ChangeCoord() += shift * V.XYZ() / Vsize;
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}
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}
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@ -603,7 +677,7 @@ static bool HasIntersection3(const gp_Pnt& P, const gp_Pnt& PC, gp_Pnt& P
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//=======================================================================
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//function : HasIntersection
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//purpose : Auxilare for CheckIntersection()
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//purpose : Auxiliary for CheckIntersection()
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//=======================================================================
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static bool HasIntersection(const gp_Pnt& P, const gp_Pnt& PC, gp_Pnt& Pint,
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@ -991,19 +1065,23 @@ bool StdMeshers_QuadToTriaAdaptor::Compute(SMESH_Mesh& aMesh,
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case QUAD:
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{
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if(!isRev) VNorm.Reverse();
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double xc = 0., yc = 0., zc = 0.;
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//double xc = 0., yc = 0., zc = 0.;
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double h, hMin = Precision::Infinite();
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gp_Pnt PCbest = PC;
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int i = 1;
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for(; i<=4; i++) {
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gp_Pnt Pbest;
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if(!isRev)
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Pbest = FindBestPoint(PN(i), PN(i+1), PC, VN(i).Reversed());
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Pbest = FindBestPoint(PN(i), PN(i+1), PC, VN(i).Reversed(), h);
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else
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Pbest = FindBestPoint(PN(i), PN(i+1), PC, VN(i));
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xc += Pbest.X();
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yc += Pbest.Y();
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zc += Pbest.Z();
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Pbest = FindBestPoint(PN(i), PN(i+1), PC, VN(i), h);
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if ( 0 < h && h < hMin )
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{
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PCbest = Pbest;
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hMin = h;
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}
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gp_Pnt PCbest(xc/4., yc/4., zc/4.);
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}
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//gp_Pnt PCbest(xc/4., yc/4., zc/4.);
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// check PCbest
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double height = PCbest.Distance(PC);
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@ -1027,6 +1105,9 @@ bool StdMeshers_QuadToTriaAdaptor::Compute(SMESH_Mesh& aMesh,
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else
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aPyram = helper->AddVolume( FNodes[0], FNodes[1], FNodes[2], FNodes[3], NewNode );
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myPyramids.push_back(aPyram);
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//cout << "F" << face->GetID() << " - V" << aPyram->GetID() << endl;
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myPyramHeight2.Bind( aPyram, PCbest.SquareDistance( PC ));
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// add triangles to result map
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helper->SetElementsOnShape( false );
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@ -1236,13 +1317,19 @@ bool StdMeshers_QuadToTriaAdaptor::Compute(SMESH_Mesh& aMesh)
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// Find pyramid peak
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gp_XYZ PCbest(0., 0., 0.); // pyramid peak
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gp_XYZ PCbest = PC.XYZ();//(0., 0., 0.); // pyramid peak
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double h, hMin = Precision::Infinite();
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int i = 1;
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for ( ; i <= 4; i++ ) {
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gp_Pnt Pbest = FindBestPoint(PN(i), PN(i+1), PC, VN(i));
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PCbest += Pbest.XYZ();
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gp_Pnt Pbest = FindBestPoint(PN(i), PN(i+1), PC, VN(i), h);
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if ( 0 < h && h < hMin )
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{
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PCbest = Pbest.XYZ();
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h = hMin;
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}
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PCbest /= 4;
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//PCbest += Pbest.XYZ();
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}
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//PCbest /= 4;
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double height = PC.Distance(PCbest); // pyramid height to precise
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if ( height < 1.e-6 ) {
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@ -1354,6 +1441,8 @@ bool StdMeshers_QuadToTriaAdaptor::Compute(SMESH_Mesh& aMesh)
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aPyram = helper.AddVolume( FNodes[0], FNodes[3], FNodes[2], FNodes[1], NewNode );
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myPyramids.push_back(aPyram);
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//myPyramHeight2.Bind( aPyram, Papex.SquareDistance( PC ));
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// add triangles to result map
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helper.SetElementsOnShape( false );
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for ( i = 0; i < 4; i++) {
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@ -1398,10 +1487,37 @@ bool StdMeshers_QuadToTriaAdaptor::Compute2ndPart(SMESH_Mesh&
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// check adjacent pyramids
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for ( i = 0; i < myPyramids.size(); ++i )
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// for ( i = 0; i < myPyramids.size(); ++i )
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// {
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// const SMDS_MeshElement* PrmI = myPyramids[i];
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// MergeAdjacent( PrmI, nodesToMove );
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// }
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// Fix adjacent pyramids whose heights differ too much
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myNodes.resize(2);
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bool modifHeight = true;
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typedef NCollection_DataMap< const SMDS_MeshElement*, double >::Iterator TPyramToH2Iter;
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while ( modifHeight )
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{
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const SMDS_MeshElement* PrmI = myPyramids[i];
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MergeAdjacent( PrmI, nodesToMove );
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modifHeight = false;
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for ( TPyramToH2Iter pyramToH2( myPyramHeight2 ); pyramToH2.More(); pyramToH2.Next() )
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modifHeight |= DecreaseHeightDifference( pyramToH2.Key(), pyramToH2.Value() );
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}
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for ( TPyramToH2Iter pyramToH2( myPyramHeight2 ); pyramToH2.More(); pyramToH2.Next() )
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{
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if ( pyramToH2.Value() > 0 )
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continue; // not changed
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const double h = Sqrt( - pyramToH2.Value() );
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const SMDS_MeshElement* pyram = pyramToH2.Key();
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SMESH_NodeXYZ Papex = pyram->GetNode( PYRAM_APEX );
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gp_XYZ PC( 0,0,0 );
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for ( int i = 0; i < 4; ++i )
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PC += SMESH_NodeXYZ( pyram->GetNode( i ));
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PC /= 4;
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gp_Vec V( PC, Papex );
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gp_Pnt newApex = gp_Pnt( PC ).Translated( h * V.Normalized() );
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meshDS->MoveNode( Papex.Node(), newApex.X(), newApex.Y(), newApex.Z() );
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}
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// iterate on all new pyramids
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@ -1490,7 +1606,7 @@ bool StdMeshers_QuadToTriaAdaptor::Compute2ndPart(SMESH_Mesh&
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if ( nbc == 4 )
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continue; // pyrams have a common base face
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if ( nbc > 0 )
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if ( nbc > 1 )
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{
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// Merge the two pyramids and others already merged with them
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MergePiramids( PrmI, PrmJ, nodesToMove );
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@ -1524,10 +1640,11 @@ bool StdMeshers_QuadToTriaAdaptor::Compute2ndPart(SMESH_Mesh&
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aNode2->setXYZ( PCj.X()+VN2.X(), PCj.Y()+VN2.Y(), PCj.Z()+VN2.Z() );
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nodesToMove.insert( aNode1 );
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nodesToMove.insert( aNode2 );
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//cout << "Limit H F" << getFaceID( PrmI ) << " - F" << getFaceID( PrmJ ) << endl;
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}
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// fix intersections that can appear after apex movement
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MergeAdjacent( PrmI, nodesToMove );
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MergeAdjacent( PrmJ, nodesToMove );
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//MergeAdjacent( PrmI, nodesToMove );
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//MergeAdjacent( PrmJ, nodesToMove );
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apexI = PrmI->GetNode( PYRAM_APEX ); // apexI can be removed by merge
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@ -1537,6 +1654,13 @@ bool StdMeshers_QuadToTriaAdaptor::Compute2ndPart(SMESH_Mesh&
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} // loop on all pyramids
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//smIdType nbNodes = aMesh.NbNodes();
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for ( i = 0; i < myPyramids.size(); ++i )
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{
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const SMDS_MeshElement* PrmI = myPyramids[i];
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MergeAdjacent( PrmI, nodesToMove );
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}
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if( !nodesToMove.empty() && !meshDS->IsEmbeddedMode() )
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{
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set<const SMDS_MeshNode*>::iterator n = nodesToMove.begin();
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@ -44,6 +44,7 @@ class gp_Vec;
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#include <vector>
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#include <TopoDS_Shape.hxx>
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#include <NCollection_DataMap.hxx>
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/*!
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* \brief "Transforms" quadrilateral faces into triangular ones by creation of pyramids
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@ -93,11 +94,19 @@ protected:
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std::set<const SMDS_MeshNode*>& nodesToMove,
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const bool isRecursion = false);
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bool DecreaseHeightDifference( const SMDS_MeshElement* pyram,
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const double h2 );
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TopoDS_Shape myShape;
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std::set<const SMDS_MeshElement*> myRemovedTrias;
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std::list< const SMDS_MeshNode* > myDegNodes;
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const SMESH_ElementSearcher* myElemSearcher;
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NCollection_DataMap< const SMDS_MeshElement*, double > myPyramHeight2;
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// work buffers of DecreaseHeightDifference()
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std::vector< const SMDS_MeshElement* > myAdjPyrams;
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std::vector<const SMDS_MeshNode *> myNodes;
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};
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#endif
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