From: eap Date: Fri, 2 Nov 2012 09:50:14 +0000 (+0000) Subject: 0021543: EDF 1978 SMESH: Viscous layer for 2D meshes X-Git-Tag: V6_6_0b1~22 X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=d05c72902af3c5dd19a56236debce270baa77a46;p=modules%2Fsmesh.git 0021543: EDF 1978 SMESH: Viscous layer for 2D meshes debug on a complex sketch + bool improve(); --- diff --git a/src/StdMeshers/StdMeshers_ViscousLayers2D.cxx b/src/StdMeshers/StdMeshers_ViscousLayers2D.cxx index cc4828038..20d5b85b3 100644 --- a/src/StdMeshers/StdMeshers_ViscousLayers2D.cxx +++ b/src/StdMeshers/StdMeshers_ViscousLayers2D.cxx @@ -336,6 +336,7 @@ namespace VISCOUS_2D bool fixCollisions(); bool refine(); bool shrink(); + bool improve(); bool toShrinkForAdjacent( const TopoDS_Face& adjFace, const TopoDS_Edge& E, const TopoDS_Vertex& V); @@ -429,9 +430,9 @@ StdMeshers_ViscousLayers2D::Compute(SMESH_Mesh& theMesh, SMESH_ComputeErrorPtr error = builder.GetError(); if ( error && !error->IsOK() ) theMesh.GetSubMesh( theFace )->GetComputeError() = error; - else if ( !pm ) - pm.reset( new SMESH_ProxyMesh( theMesh )); - //pm.reset(); + // else if ( !pm ) + // pm.reset( new SMESH_ProxyMesh( theMesh )); + pm.reset(); } else { @@ -527,8 +528,6 @@ SMESH_ProxyMesh::Ptr _ViscousBuilder2D::Compute() if ( !_error->IsOK() ) return _proxyMesh; - //PyDump debugDump; - if ( !findEdgesWithLayers() ) // analysis of a shape return _proxyMesh; @@ -544,11 +543,7 @@ SMESH_ProxyMesh::Ptr _ViscousBuilder2D::Compute() if ( ! refine() ) // make faces return _proxyMesh; - // for ( size_t i = 0; i < _facesToRecompute.size(); ++i ) - // _mesh->GetSubMesh( _facesToRecompute[i] )->ComputeStateEngine( SMESH_subMesh::COMPUTE ); - - //makeGroupOfLE(); // debug - //debugDump.Finish(); + improve(); return _proxyMesh; } @@ -1117,7 +1112,7 @@ bool _ViscousBuilder2D::fixCollisions() for ( size_t iLE = L1.FirstLEdge(); iLE < L1._lEdges.size(); ++iLE ) { _LayerEdge& LE1 = L1._lEdges[iLE]; - //if ( LE1._isBlocked ) continue; + if ( LE1._isBlocked ) continue; foundSegs.clear(); L2._segTree->GetSegmentsNear( LE1._ray, foundSegs ); for ( size_t i = 0; i < foundSegs.size(); ++i ) @@ -1355,7 +1350,8 @@ bool _ViscousBuilder2D::shrink() !curveInt.IsEmpty() && curveInt.Point( 1 ).Value().Distance( uvFSeg2Out ) <= maxDist2d ) { /* convex VERTEX */ - u = curveInt.Point( 1 ).ParamOnFirst(); /* |L seg2 + length2D = Abs( u - curveInt.Point( 1 ).ParamOnFirst() ); + /* |L seg2 * | o---o--- * | / | * |/ | L2 @@ -1376,14 +1372,14 @@ bool _ViscousBuilder2D::shrink() if ( length2D == 0 ) length2D = ( isR ? L._leftLine->_lEdges.back() : L._rightLine->_lEdges.front() )._length2D; } - if ( length2D > 0 ) { - // move u to the internal boundary of layers - double maxLen3D = Min( _thickness, edgeLen / ( 1 + nbAdvancable )); - double maxLen2D = maxLen3D * nearLE._len2dTo3dRatio; - if ( length2D > maxLen2D ) - length2D = maxLen2D; - u += length2D * sign; - } + // move u to the internal boundary of layers + double maxLen3D = Min( _thickness, edgeLen / ( 1 + nbAdvancable )); + double maxLen2D = maxLen3D * nearLE._len2dTo3dRatio; + if ( length2D > maxLen2D ) + length2D = maxLen2D; + nearLE._uvIn = nearLE._uvOut + nearLE._normal2D * length2D; + + u += length2D * sign; nodeDataVec[ iPEnd ].param = u; gp_Pnt2d newUV = pcurve->Value( u ); @@ -1578,7 +1574,7 @@ bool _ViscousBuilder2D::refine() //if ( L._leftLine->_advancable ) L._lEdges[0] = L._leftLine->_lEdges.back(); - // replace an inactive _LayerEdge with an active one of a neighbour _PolyLine + // replace an inactive (1st) _LayerEdge with an active one of a neighbour _PolyLine size_t iLE = 0, nbLE = L._lEdges.size(); if ( /*!L._leftLine->_advancable &&*/ L.IsCommonEdgeShared( *L._leftLine )) { @@ -1597,9 +1593,7 @@ bool _ViscousBuilder2D::refine() { int nbRemove = 0, deltaIt = isR ? -1 : +1; _PolyLine::TEdgeIterator eIt = isR ? L._lEdges.end()-1 : L._lEdges.begin(); - // HEURISTICS !!! elongate the first _LayerEdge - gp_XY newIn = eIt->_uvOut + eIt->_normal2D * eIt->_length2D/* * 2*/; - _Segment seg1( eIt->_uvOut, newIn ); + _Segment seg1( eIt->_uvOut, eIt->_uvIn ); for ( eIt += deltaIt; nbRemove < L._lEdges.size()-2; eIt += deltaIt ) { _Segment seg2( eIt->_uvOut, eIt->_uvIn ); @@ -1617,6 +1611,36 @@ bool _ViscousBuilder2D::refine() } } + // limit length of neighbour _LayerEdge's to avoid sharp change of layers thickness + vector< double > segLen( L._lEdges.size() ); + segLen[0] = 0.0; + for ( size_t i = 1; i < segLen.size(); ++i ) + { + // accumulate length of segments + double sLen = (L._lEdges[i-1]._uvOut - L._lEdges[i]._uvOut ).Modulus(); + segLen[i] = segLen[i-1] + sLen; + } + for ( int isR = 0; isR < 2; ++isR ) + { + size_t iF = 0, iL = L._lEdges.size()-1; + size_t *i = isR ? &iL : &iF; + //size_t iRef = *i; + gp_XY uvInPrev = L._lEdges[ *i ]._uvIn; + double weight = 0; + for ( ++iF, --iL; iF < L._lEdges.size()-1; ++iF, --iL ) + { + _LayerEdge& LE = L._lEdges[*i]; + gp_XY tangent ( LE._normal2D.Y(), -LE._normal2D.X() ); + weight += Abs( tangent * ( uvInPrev - LE._uvIn )) / segLen.back(); + double proj = LE._normal2D * ( uvInPrev - LE._uvOut ); + if ( LE._length2D < proj ) + weight += 0.75 * ( 1 - weight ); // length decrease is more preferable + LE._length2D = weight * LE._length2D + ( 1 - weight ) * proj; + LE._uvIn = LE._uvOut + LE._normal2D * LE._length2D; + uvInPrev = LE._uvIn; + } + } + // calculate intermediate UV on _LayerEdge's ( _LayerEdge::_uvRefined ) for ( ; iLE < nbLE; ++iLE ) { @@ -1655,8 +1679,6 @@ bool _ViscousBuilder2D::refine() size_t iS, iN0 = hasLeftNode, nbN = innerNodes.size() - hasRightNode; L._leftNodes .resize( _hyp->GetNumberLayers() ); L._rightNodes.resize( _hyp->GetNumberLayers() ); - vector< double > segLen( L._lEdges.size() ); - segLen[0] = 0.0; for ( int iF = 0; iF < _hyp->GetNumberLayers(); ++iF ) // loop on layers of faces { // get accumulated length of intermediate segments @@ -1720,6 +1742,59 @@ bool _ViscousBuilder2D::refine() return true; } +//================================================================================ +/*! + * \brief Improve quality of the created mesh elements + */ +//================================================================================ + +bool _ViscousBuilder2D::improve() +{ + if ( !_proxyMesh ) + return false; + + // faces to smooth + TIDSortedElemSet facesToSmooth; + if ( SMESHDS_SubMesh* sm = getMeshDS()->MeshElements( _face )) + { + SMDS_ElemIteratorPtr fIt = sm->GetElements(); + while ( fIt->more() ) + facesToSmooth.insert( facesToSmooth.end(), fIt->next() ); + } + + // fixed nodes on EDGE's + std::set fixedNodes; + for ( size_t iWire = 0; iWire < _faceSideVec.size(); ++iWire ) + { + StdMeshers_FaceSidePtr wire = _faceSideVec[ iWire ]; + const vector& points = wire->GetUVPtStruct(); + for ( size_t i = 0; i < points.size(); ++i ) + fixedNodes.insert( fixedNodes.end(), points[i].node ); + } + // fixed proxy nodes + for ( size_t iL = 0; iL < _polyLineVec.size(); ++iL ) + { + _PolyLine& L = _polyLineVec[ iL ]; + const TopoDS_Edge& E = L._wire->Edge( L._edgeInd ); + if ( const SMESH_ProxyMesh::SubMesh* sm = _proxyMesh->GetProxySubMesh( E )) + { + const UVPtStructVec& points = sm->GetUVPtStructVec(); + for ( size_t i = 0; i < points.size(); ++i ) + fixedNodes.insert( fixedNodes.end(), points[i].node ); + } + for ( size_t i = 0; i < L._rightNodes.size(); ++i ) + fixedNodes.insert( fixedNodes.end(), L._rightNodes[i] ); + } + + // smoothing + SMESH_MeshEditor editor( _mesh ); + editor.Smooth( facesToSmooth, fixedNodes, SMESH_MeshEditor::CENTROIDAL, /*nbIt = */3 ); + //editor.Smooth( facesToSmooth, fixedNodes, SMESH_MeshEditor::LAPLACIAN, /*nbIt = */1 ); + //editor.Smooth( facesToSmooth, fixedNodes, SMESH_MeshEditor::CENTROIDAL, /*nbIt = */1 ); + + return true; +} + //================================================================================ /*! * \brief Remove elements and nodes from a face