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smesh/src/StdMeshers/StdMeshers_HexaFromSkin_3D.cxx
vsr 2c607013a2 Merge from V6_3_BR 06/06/2011
2011-06-06 08:15:39 +00:00

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// Copyright (C) 2007-2011 CEA/DEN, EDF R&D, OPEN CASCADE
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//
// File : StdMeshers_HexaFromSkin_3D.cxx
// Created : Wed Jan 27 12:28:07 2010
// Author : Edward AGAPOV (eap)
//
#include "StdMeshers_HexaFromSkin_3D.hxx"
#include "SMDS_VolumeOfNodes.hxx"
#include "SMDS_VolumeTool.hxx"
#include "SMESH_Block.hxx"
#include "SMESH_MesherHelper.hxx"
#include <gp_Ax2.hxx>
//#include "utilities.h"
#include <limits>
// Define error message
#ifdef _DEBUG_
#define BAD_MESH_ERR \
error(SMESH_Comment("Can't detect block-wise structure of the input 2D mesh.\n" \
__FILE__ ":" )<<__LINE__)
#else
#define BAD_MESH_ERR \
error(SMESH_Comment("Can't detect block-wise structure of the input 2D mesh"))
#endif
// Debug output
#define _DUMP_(msg) //cout << msg << endl
namespace
{
enum EBoxSides //!< sides of the block
{
B_BOTTOM=0, B_RIGHT, B_TOP, B_LEFT, B_FRONT, B_BACK, NB_BLOCK_SIDES
};
// const char* SBoxSides[] = //!< names of block sides -- needed for DEBUG only
// {
// "BOTTOM", "RIGHT", "TOP", "LEFT", "FRONT", "BACK", "UNDEFINED"
// };
enum EQuadEdge //!< edges of quadrangle side
{
Q_BOTTOM = 0, Q_RIGHT, Q_TOP, Q_LEFT, NB_QUAD_SIDES
};
//================================================================================
/*!
* \brief return logical coordinates (i.e. min or max) of ends of edge
*/
//================================================================================
bool getEdgeEnds(EQuadEdge edge, bool& xMax1, bool& yMax1, bool& xMax2, bool& yMax2 )
{
xMax1=0, yMax1=0, xMax2=1, yMax2=1;
switch( edge )
{
case Q_BOTTOM: yMax2 = 0; break;
case Q_RIGHT: xMax1 = 1; break;
case Q_TOP: yMax1 = 1; break;
case Q_LEFT: xMax2 = 0; break;
default:
return false;
}
return true;
}
//================================================================================
/*!
* \brief Description of node used to detect corner nodes
*/
struct _NodeDescriptor
{
int nbInverseFaces, nbNodesInInverseFaces;
_NodeDescriptor(const SMDS_MeshNode* n): nbInverseFaces(0), nbNodesInInverseFaces(0)
{
if ( n )
{
set<const SMDS_MeshNode*> nodes;
SMDS_ElemIteratorPtr fIt = n->GetInverseElementIterator(SMDSAbs_Face );
while ( fIt->more() )
{
const SMDS_MeshElement* face = fIt->next();
nodes.insert( face->begin_nodes(), face->end_nodes() );
nbInverseFaces++;
}
nbNodesInInverseFaces = nodes.size();
}
}
bool operator==(const _NodeDescriptor& other) const
{
return
nbInverseFaces == other.nbInverseFaces &&
nbNodesInInverseFaces == other.nbNodesInInverseFaces;
}
};
//================================================================================
/*!
* \brief return true if a node is at block corner
*
* This check is valid for simple cases only
*/
//================================================================================
bool isCornerNode( const SMDS_MeshNode* n )
{
return n && n->NbInverseElements( SMDSAbs_Face ) % 2;
}
//================================================================================
/*!
* \brief check element type
*/
//================================================================================
bool isQuadrangle(const SMDS_MeshElement* e)
{
return ( e && e->NbCornerNodes() == 4 );
}
//================================================================================
/*!
* \brief return opposite node of a quadrangle face
*/
//================================================================================
const SMDS_MeshNode* oppositeNode(const SMDS_MeshElement* quad, int iNode)
{
return quad->GetNode( (iNode+2) % 4 );
}
//================================================================================
/*!
* \brief Convertor of a pair of integers to a sole index
*/
struct _Indexer
{
int _xSize, _ySize;
_Indexer( int xSize=0, int ySize=0 ): _xSize(xSize), _ySize(ySize) {}
int size() const { return _xSize * _ySize; }
int operator()(int x, int y) const { return y * _xSize + x; }
};
//================================================================================
/*!
* \brief Oriented convertor of a pair of integers to a sole index
*/
class _OrientedIndexer : public _Indexer
{
public:
enum OriFlags //!< types of block side orientation
{
REV_X = 1, REV_Y = 2, SWAP_XY = 4, MAX_ORI = REV_X|REV_Y|SWAP_XY
};
_OrientedIndexer( const _Indexer& indexer, const int oriFlags ):
_Indexer( indexer._xSize, indexer._ySize ),
_xSize (indexer._xSize), _ySize(indexer._ySize),
_xRevFun((oriFlags & REV_X) ? & reverse : & lazy),
_yRevFun((oriFlags & REV_Y) ? & reverse : & lazy),
_swapFun((oriFlags & SWAP_XY ) ? & swap : & lazy)
{
(*_swapFun)( _xSize, _ySize );
}
//!< Return index by XY
int operator()(int x, int y) const
{
(*_xRevFun)( x, const_cast<int&>( _xSize ));
(*_yRevFun)( y, const_cast<int&>( _ySize ));
(*_swapFun)( x, y );
return _Indexer::operator()(x,y);
}
//!< Return index for a corner
int corner(bool xMax, bool yMax) const
{
int x = xMax, y = yMax, size = 2;
(*_xRevFun)( x, size );
(*_yRevFun)( y, size );
(*_swapFun)( x, y );
return _Indexer::operator()(x ? _Indexer::_xSize-1 : 0 , y ? _Indexer::_ySize-1 : 0);
}
int xSize() const { return _xSize; }
int ySize() const { return _ySize; }
private:
_Indexer _indexer;
int _xSize, _ySize;
typedef void (*TFun)(int& x, int& y);
TFun _xRevFun, _yRevFun, _swapFun;
static void lazy(int&, int&) {}
static void reverse(int& x, int& size) { x = size - x - 1; }
static void swap(int& x, int& y) { std::swap(x,y); }
};
//================================================================================
/*!
* \brief Structure corresponding to the meshed side of block
*/
struct _BlockSide
{
vector<const SMDS_MeshNode*> _grid;
_Indexer _index;
int _nbBlocksExpected;
int _nbBlocksFound;
#ifdef _DEBUG_ // want to get SIGSEGV in case of invalid index
#define _grid_access_(pobj, i) pobj->_grid[ ((i) < pobj->_grid.size()) ? i : int(1e100)]
#else
#define _grid_access_(pobj, i) pobj->_grid[ i ]
#endif
//!< Return node at XY
const SMDS_MeshNode* getNode(int x, int y) const { return _grid_access_(this, _index( x,y ));}
//!< Set node at XY
void setNode(int x, int y, const SMDS_MeshNode* n) { _grid_access_(this, _index( x,y )) = n; }
//!< Return an edge
SMESH_OrientedLink getEdge(EQuadEdge edge) const
{
bool x1, y1, x2, y2; getEdgeEnds( edge, x1, y1, x2, y2 );
return SMESH_OrientedLink( getCornerNode ( x1, y1 ), getCornerNode( x2, y2 ));
}
//!< Return a corner node
const SMDS_MeshNode* getCornerNode(bool isXMax, bool isYMax) const
{
return getNode( isXMax ? _index._xSize-1 : 0 , isYMax ? _index._ySize-1 : 0 );
}
const SMDS_MeshElement* getCornerFace(const SMDS_MeshNode* cornerNode) const;
//!< True if all blocks this side belongs to have beem found
bool isBound() const { return _nbBlocksExpected <= _nbBlocksFound; }
//!< Return coordinates of node at XY
gp_XYZ getXYZ(int x, int y) const { return SMESH_TNodeXYZ( getNode( x, y )); }
//!< Return gravity center of the four corners and the middle node
gp_XYZ getGC() const
{
gp_XYZ xyz =
getXYZ( 0, 0 ) +
getXYZ( _index._xSize-1, 0 ) +
getXYZ( 0, _index._ySize-1 ) +
getXYZ( _index._xSize-1, _index._ySize-1 ) +
getXYZ( _index._xSize/2, _index._ySize/2 );
return xyz / 5;
}
//!< Return number of mesh faces
int getNbFaces() const { return (_index._xSize-1) * (_index._ySize-1); }
};
//================================================================================
/*!
* \brief _BlockSide with changed orientation
*/
struct _OrientedBlockSide
{
_BlockSide* _side;
_OrientedIndexer _index;
_OrientedBlockSide( _BlockSide* side=0, const int oriFlags=0 ):
_side(side), _index(side ? side->_index : _Indexer(), oriFlags ) {}
//!< return coordinates by XY
gp_XYZ xyz(int x, int y) const
{
return SMESH_TNodeXYZ( _grid_access_(_side, _index( x, y )) );
}
//!< safely return a node by XY
const SMDS_MeshNode* node(int x, int y) const
{
int i = _index( x, y );
return ( i < 0 || i >= _side->_grid.size()) ? 0 : _side->_grid[i];
}
//!< Return an edge
SMESH_OrientedLink edge(EQuadEdge edge) const
{
bool x1, y1, x2, y2; getEdgeEnds( edge, x1, y1, x2, y2 );
return SMESH_OrientedLink( cornerNode ( x1, y1 ), cornerNode( x2, y2 ));
}
//!< Return a corner node
const SMDS_MeshNode* cornerNode(bool isXMax, bool isYMax) const
{
return _grid_access_(_side, _index.corner( isXMax, isYMax ));
}
//!< return its size in nodes
int getHoriSize() const { return _index.xSize(); }
int getVertSize() const { return _index.ySize(); }
//!< True if _side has been initialized
operator bool() const { return _side; }
//! Direct access to _side
const _BlockSide* operator->() const { return _side; }
_BlockSide* operator->() { return _side; }
};
//================================================================================
/*!
* \brief Meshed skin of block
*/
struct _Block
{
_OrientedBlockSide _side[6]; // 6 sides of a sub-block
set<const SMDS_MeshNode*> _corners;
const _OrientedBlockSide& getSide(int i) const { return _side[i]; }
bool setSide( int i, const _OrientedBlockSide& s)
{
if (( _side[i] = s ))
{
_corners.insert( s.cornerNode(0,0));
_corners.insert( s.cornerNode(1,0));
_corners.insert( s.cornerNode(0,1));
_corners.insert( s.cornerNode(1,1));
}
return s;
}
void clear() { for (int i=0;i<6;++i) _side[i]=0; _corners.clear(); }
bool hasSide( const _OrientedBlockSide& s) const
{
if ( s ) for (int i=0;i<6;++i) if ( _side[i] && _side[i]._side == s._side ) return true;
return false;
}
int nbSides() const { int n=0; for (int i=0;i<6;++i) if ( _side[i] ) ++n; return n; }
bool isValid() const;
};
//================================================================================
/*!
* \brief Skin mesh possibly containing several meshed blocks
*/
class _Skin
{
public:
int findBlocks(SMESH_Mesh& mesh);
//!< return i-th block
const _Block& getBlock(int i) const { return _blocks[i]; }
//!< return error description
const SMESH_Comment& error() const { return _error; }
private:
bool fillSide( _BlockSide& side,
const SMDS_MeshElement* cornerQuad,
const SMDS_MeshNode* cornerNode);
bool fillRowsUntilCorner(const SMDS_MeshElement* quad,
const SMDS_MeshNode* n1,
const SMDS_MeshNode* n2,
vector<const SMDS_MeshNode*>& verRow1,
vector<const SMDS_MeshNode*>& verRow2,
bool alongN1N2 );
_OrientedBlockSide findBlockSide( EBoxSides startBlockSide,
EQuadEdge sharedSideEdge1,
EQuadEdge sharedSideEdge2,
bool withGeometricAnalysis);
//!< update own data and data of the side bound to block
void setSideBoundToBlock( _BlockSide& side )
{
if ( side._nbBlocksFound++, side.isBound() )
for ( int e = 0; e < int(NB_QUAD_SIDES); ++e )
_edge2sides[ side.getEdge( (EQuadEdge) e ) ].erase( &side );
}
//!< store reason of error
int error(const SMESH_Comment& reason) { _error = reason; return 0; }
SMESH_Comment _error;
list< _BlockSide > _allSides;
vector< _Block > _blocks;
//map< const SMDS_MeshNode*, set< _BlockSide* > > _corner2sides;
map< SMESH_OrientedLink, set< _BlockSide* > > _edge2sides;
};
//================================================================================
/*!
* \brief Find and return number of submeshes corresponding to blocks
*/
//================================================================================
int _Skin::findBlocks(SMESH_Mesh& mesh)
{
SMESHDS_Mesh* meshDS = mesh.GetMeshDS();
// Find a node at any block corner
SMDS_NodeIteratorPtr nIt = meshDS->nodesIterator(/*idInceasingOrder=*/true);
if ( !nIt->more() ) return error("Empty mesh");
const SMDS_MeshNode* nCorner = 0;
while ( nIt->more() )
{
nCorner = nIt->next();
if ( isCornerNode( nCorner ))
break;
else
nCorner = 0;
}
if ( !nCorner )
return BAD_MESH_ERR;
// --------------------------------------------------------------------
// Find all block sides starting from mesh faces sharing the corner node
// --------------------------------------------------------------------
int nbFacesOnSides = 0;
TIDSortedElemSet cornerFaces; // corner faces of found _BlockSide's
list< const SMDS_MeshNode* > corners( 1, nCorner );
list< const SMDS_MeshNode* >::iterator corner = corners.begin();
while ( corner != corners.end() )
{
SMDS_ElemIteratorPtr faceIt = (*corner)->GetInverseElementIterator( SMDSAbs_Face );
while ( faceIt->more() )
{
const SMDS_MeshElement* face = faceIt->next();
if ( !cornerFaces.insert( face ).second )
continue; // already loaded block side
if ( !isQuadrangle( face ))
return error("Non-quadrangle elements in the input mesh");
if ( _allSides.empty() || !_allSides.back()._grid.empty() )
_allSides.push_back( _BlockSide() );
_BlockSide& side = _allSides.back();
if ( !fillSide( side, face, *corner ) )
{
if ( !_error.empty() )
return false;
}
else
{
for ( int isXMax = 0; isXMax < 2; ++isXMax )
for ( int isYMax = 0; isYMax < 2; ++isYMax )
{
const SMDS_MeshNode* nCorner = side.getCornerNode(isXMax,isYMax );
corners.push_back( nCorner );
cornerFaces.insert( side.getCornerFace( nCorner ));
}
for ( int e = 0; e < int(NB_QUAD_SIDES); ++e )
_edge2sides[ side.getEdge( (EQuadEdge) e ) ].insert( &side );
nbFacesOnSides += side.getNbFaces();
}
}
++corner;
// find block sides of other domains if any
if ( corner == corners.end() && nbFacesOnSides < mesh.NbQuadrangles() )
{
while ( nIt->more() )
{
nCorner = nIt->next();
if ( isCornerNode( nCorner ))
corner = corners.insert( corner, nCorner );
}
nbFacesOnSides = mesh.NbQuadrangles();
}
}
if ( _allSides.empty() )
return BAD_MESH_ERR;
if ( _allSides.back()._grid.empty() )
_allSides.pop_back();
_DUMP_("Nb detected sides "<< _allSides.size());
// ---------------------------
// Organize sides into blocks
// ---------------------------
// analyse sharing of sides by blocks and sort sides by nb of adjacent sides
int nbBlockSides = 0; // total nb of block sides taking into account their sharing
multimap<int, _BlockSide* > sortedSides;
{
list < _BlockSide >::iterator sideIt = _allSides.begin();
for ( ; sideIt != _allSides.end(); ++sideIt )
{
_BlockSide& side = *sideIt;
bool isSharedSide = true;
int nbAdjacent = 0;
for ( int e = 0; e < int(NB_QUAD_SIDES) && isSharedSide; ++e )
{
int nbAdj = _edge2sides[ side.getEdge( (EQuadEdge) e ) ].size();
nbAdjacent += nbAdj;
isSharedSide = ( nbAdj > 2 );
}
side._nbBlocksFound = 0;
side._nbBlocksExpected = isSharedSide ? 2 : 1;
nbBlockSides += side._nbBlocksExpected;
sortedSides.insert( make_pair( nbAdjacent, & side ));
}
}
// find sides of each block
int nbBlocks = 0;
while ( nbBlockSides >= 6 )
{
// get any side not bound to all blocks it belongs to
multimap<int, _BlockSide*>::iterator i_side = sortedSides.begin();
while ( i_side != sortedSides.end() && i_side->second->isBound())
++i_side;
// start searching for block sides from the got side
bool ok = true;
if ( _blocks.empty() || _blocks.back()._side[B_FRONT] )
_blocks.resize( _blocks.size() + 1 );
_Block& block = _blocks.back();
block.setSide( B_FRONT, i_side->second );
setSideBoundToBlock( *i_side->second );
nbBlockSides--;
// edges of adjacent sides of B_FRONT corresponding to front's edges
EQuadEdge edgeOfFront[4] = { Q_BOTTOM, Q_RIGHT, Q_TOP, Q_LEFT };
EQuadEdge edgeOfAdj [4] = { Q_BOTTOM, Q_LEFT, Q_BOTTOM, Q_LEFT };
// first find all sides detectable w/o advanced analysis,
// then repeat the search, which then may pass without advanced analysis
for ( int advAnalys = 0; advAnalys < 2; ++advAnalys )
{
for ( int i = 0; (ok || !advAnalys) && i < NB_QUAD_SIDES; ++i )
if ( !block._side[i] ) // try to find 4 sides adjacent to front side
ok = block.setSide( i, findBlockSide( B_FRONT, edgeOfFront[i],edgeOfAdj[i],advAnalys));
if ( ok || !advAnalys)
if ( !block._side[B_BACK] && block._side[B_TOP] ) // try to find back side by top one
ok = block.setSide( B_BACK, findBlockSide( B_TOP, Q_TOP, Q_TOP, advAnalys ));
if ( !advAnalys ) ok = true;
}
ok = block.isValid();
if ( ok )
{
// check if just found block is same as one of previously found
bool isSame = false;
for ( int i = 1; i < _blocks.size() && !isSame; ++i )
isSame = ( block._corners == _blocks[i-1]._corners );
ok = !isSame;
}
// count the found sides
_DUMP_(endl << "** Block " << _blocks.size() << " valid: " << block.isValid());
for (int i = 0; i < NB_BLOCK_SIDES; ++i )
{
_DUMP_("\tSide "<< SBoxSides[i] <<" "<< block._side[ i ]._side);
if ( block._side[ i ] )
{
if ( ok && i != B_FRONT)
{
setSideBoundToBlock( *block._side[ i ]._side );
nbBlockSides--;
}
_DUMP_("\t corners "<<
block._side[ i ].cornerNode(0,0)->GetID() << ", " <<
block._side[ i ].cornerNode(1,0)->GetID() << ", " <<
block._side[ i ].cornerNode(1,1)->GetID() << ", " <<
block._side[ i ].cornerNode(0,1)->GetID() << ", "<<endl);
}
else
{
_DUMP_("\t not found"<<endl);
}
}
if ( !ok )
block.clear();
else
nbBlocks++;
}
_DUMP_("Nb found blocks "<< nbBlocks <<endl);
if ( nbBlocks == 0 && _error.empty() )
return BAD_MESH_ERR;
return nbBlocks;
}
//================================================================================
/*!
* \brief Fill block side data starting from its corner quadrangle
*/
//================================================================================
bool _Skin::fillSide( _BlockSide& side,
const SMDS_MeshElement* cornerQuad,
const SMDS_MeshNode* nCorner)
{
// Find out size of block side mesured in nodes and by the way find two rows
// of nodes in two directions.
int x, y, nbX, nbY;
const SMDS_MeshElement* firstQuad = cornerQuad;
{
// get a node on block edge
int iCorner = firstQuad->GetNodeIndex( nCorner );
const SMDS_MeshNode* nOnEdge = firstQuad->GetNode( (iCorner+1) % 4);
// find out size of block side
vector<const SMDS_MeshNode*> horRow1, horRow2, verRow1, verRow2;
if ( !fillRowsUntilCorner( firstQuad, nCorner, nOnEdge, horRow1, horRow2, true ) ||
!fillRowsUntilCorner( firstQuad, nCorner, nOnEdge, verRow1, verRow2, false ))
return false;
nbX = horRow1.size(), nbY = verRow1.size();
// store found nodes
side._index._xSize = horRow1.size();
side._index._ySize = verRow1.size();
side._grid.resize( side._index.size(), NULL );
for ( x = 0; x < horRow1.size(); ++x )
{
side.setNode( x, 0, horRow1[x] );
side.setNode( x, 1, horRow2[x] );
}
for ( y = 0; y < verRow1.size(); ++y )
{
side.setNode( 0, y, verRow1[y] );
side.setNode( 1, y, verRow2[y] );
}
}
// Find the rest nodes
y = 1; // y of the row to fill
TIDSortedElemSet emptySet, avoidSet;
while ( ++y < nbY )
{
// get next firstQuad in the next row of quadrangles
//
// n2up
// o---o <- y row
// | |
// o---o o o o o <- found nodes
//n1down n2down
//
int i1down, i2down, i2up;
const SMDS_MeshNode* n1down = side.getNode( 0, y-1 );
const SMDS_MeshNode* n2down = side.getNode( 1, y-1 );
avoidSet.clear(); avoidSet.insert( firstQuad );
firstQuad = SMESH_MeshEditor::FindFaceInSet( n1down, n2down, emptySet, avoidSet,
&i1down, &i2down);
if ( !isQuadrangle( firstQuad ))
return BAD_MESH_ERR;
const SMDS_MeshNode* n2up = oppositeNode( firstQuad, i1down );
avoidSet.clear(); avoidSet.insert( firstQuad );
// find the rest nodes in the y-th row by faces in the row
x = 1;
while ( ++x < nbX )
{
const SMDS_MeshElement* quad = SMESH_MeshEditor::FindFaceInSet( n2up, n2down, emptySet,
avoidSet, &i2up, &i2down);
if ( !isQuadrangle( quad ))
return BAD_MESH_ERR;
n2up = oppositeNode( quad, i2down );
n2down = oppositeNode( quad, i2up );
avoidSet.clear(); avoidSet.insert( quad );
side.setNode( x, y, n2up );
}
}
// check side validity
bool ok =
side.getCornerFace( side.getCornerNode( 0, 0 )) &&
side.getCornerFace( side.getCornerNode( 1, 0 )) &&
side.getCornerFace( side.getCornerNode( 0, 1 )) &&
side.getCornerFace( side.getCornerNode( 1, 1 ));
return ok;
}
//================================================================================
/*!
* \brief Try to find a block side adjacent to the given side by given edge
*/
//================================================================================
_OrientedBlockSide _Skin::findBlockSide( EBoxSides startBlockSide,
EQuadEdge sharedSideEdge1,
EQuadEdge sharedSideEdge2,
bool withGeometricAnalysis)
{
_Block& block = _blocks.back();
_OrientedBlockSide& side1 = block._side[ startBlockSide ];
// get corner nodes of the given block edge
SMESH_OrientedLink edge = side1.edge( sharedSideEdge1 );
const SMDS_MeshNode* n1 = edge.node1();
const SMDS_MeshNode* n2 = edge.node2();
if ( edge._reversed ) swap( n1, n2 );
// find all sides sharing both nodes n1 and n2
set< _BlockSide* > sidesOnEdge = _edge2sides[ edge ]; // copy a set
// exclude loaded sides of block from sidesOnEdge
for (int i = 0; i < NB_BLOCK_SIDES; ++i )
if ( block._side[ i ] )
sidesOnEdge.erase( block._side[ i ]._side );
int nbSidesOnEdge = sidesOnEdge.size();
_DUMP_("nbSidesOnEdge "<< nbSidesOnEdge << " " << n1->GetID() << "-" << n2->GetID() );
if ( nbSidesOnEdge == 0 )
return 0;
_BlockSide* foundSide = 0;
if ( nbSidesOnEdge == 1 )
{
foundSide = *sidesOnEdge.begin();
}
else
{
set< _BlockSide* >::iterator sideIt = sidesOnEdge.begin();
int nbLoadedSides = block.nbSides();
if ( nbLoadedSides > 1 )
{
// Find the side having more than 2 corners common with already loaded sides
for (; !foundSide && sideIt != sidesOnEdge.end(); ++sideIt )
{
_BlockSide* sideI = *sideIt;
int nbCommonCorners =
block._corners.count( sideI->getCornerNode(0,0)) +
block._corners.count( sideI->getCornerNode(1,0)) +
block._corners.count( sideI->getCornerNode(0,1)) +
block._corners.count( sideI->getCornerNode(1,1));
if ( nbCommonCorners > 2 )
foundSide = sideI;
}
}
if ( !foundSide )
{
if ( !withGeometricAnalysis ) return 0;
// Select one of found sides most close to startBlockSide
gp_XYZ p1 ( n1->X(),n1->Y(),n1->Z()), p2 (n2->X(),n2->Y(),n2->Z());
gp_Vec p1p2( p1, p2 );
const SMDS_MeshElement* face1 = side1->getCornerFace( n1 );
gp_XYZ p1Op = SMESH_TNodeXYZ( oppositeNode( face1, face1->GetNodeIndex(n1)));
gp_Vec side1Dir( p1, p1Op );
gp_Ax2 pln( p1, p1p2, side1Dir ); // plane with normal p1p2 and X dir side1Dir
_DUMP_(" Select adjacent for "<< side1._side << " - side dir ("
<< side1Dir.X() << ", " << side1Dir.Y() << ", " << side1Dir.Z() << ")" );
map < double , _BlockSide* > angleOfSide;
for (sideIt = sidesOnEdge.begin(); sideIt != sidesOnEdge.end(); ++sideIt )
{
_BlockSide* sideI = *sideIt;
const SMDS_MeshElement* faceI = sideI->getCornerFace( n1 );
gp_XYZ p1Op = SMESH_TNodeXYZ( oppositeNode( faceI, faceI->GetNodeIndex(n1)));
gp_Vec sideIDir( p1, p1Op );
// compute angle of (sideIDir projection to pln) and (X dir of pln)
gp_Vec2d sideIDirProj( sideIDir * pln.XDirection(), sideIDir * pln.YDirection());
double angle = sideIDirProj.Angle( gp::DX2d() );
if ( angle < 0 ) angle += 2 * PI; // angle [0-2*PI]
angleOfSide.insert( make_pair( angle, sideI ));
_DUMP_(" "<< sideI << " - side dir ("
<< sideIDir.X() << ", " << sideIDir.Y() << ", " << sideIDir.Z() << ")"
<< " angle " << angle);
}
if ( nbLoadedSides == 1 )
{
double angF = angleOfSide.begin()->first, angL = angleOfSide.rbegin()->first;
if ( angF > PI ) angF = 2*PI - angF;
if ( angL > PI ) angL = 2*PI - angL;
foundSide = angF < angL ? angleOfSide.begin()->second : angleOfSide.rbegin()->second;
}
else
{
gp_XYZ gc(0,0,0); // gravity center of already loaded block sides
for (int i = 0; i < NB_BLOCK_SIDES; ++i )
if ( block._side[ i ] )
gc += block._side[ i ]._side->getGC();
gc /= nbLoadedSides;
gp_Vec gcDir( p1, gc );
gp_Vec2d gcDirProj( gcDir * pln.XDirection(), gcDir * pln.YDirection());
double gcAngle = gcDirProj.Angle( gp::DX2d() );
foundSide = gcAngle < 0 ? angleOfSide.rbegin()->second : angleOfSide.begin()->second;
}
}
_DUMP_(" selected "<< foundSide );
}
// Orient the found side correctly
// corners of found side corresponding to nodes n1 and n2
bool xMax1, yMax1, xMax2, yMax2;
if ( !getEdgeEnds( sharedSideEdge2, xMax1, yMax1, xMax2, yMax2 ))
return error(SMESH_Comment("Internal error at ")<<__FILE__<<":"<<__LINE__),
_OrientedBlockSide(0);
for ( int ori = 0; ori < _OrientedIndexer::MAX_ORI+1; ++ori )
{
_OrientedBlockSide orientedSide( foundSide, ori );
const SMDS_MeshNode* n12 = orientedSide.cornerNode( xMax1, yMax1);
const SMDS_MeshNode* n22 = orientedSide.cornerNode( xMax2, yMax2);
if ( n1 == n12 && n2 == n22 )
return orientedSide;
}
error(SMESH_Comment("Failed to orient a block side found by edge ")<<sharedSideEdge1
<< " of side " << startBlockSide
<< " of block " << _blocks.size());
return 0;
}
//================================================================================
/*!
* \brief: Fill rows (which are actually columns,if !alongN1N2) of nodes starting
* from the given quadrangle until another block corner encounters.
* n1 and n2 are at bottom of quad, n1 is at block corner.
*/
//================================================================================
bool _Skin::fillRowsUntilCorner(const SMDS_MeshElement* quad,
const SMDS_MeshNode* n1,
const SMDS_MeshNode* n2,
vector<const SMDS_MeshNode*>& row1,
vector<const SMDS_MeshNode*>& row2,
const bool alongN1N2 )
{
const SMDS_MeshNode* corner1 = n1;
// Store nodes of quad in the rows and find new n1 and n2 to get
// the next face so that new n2 is on block edge
int i1 = quad->GetNodeIndex( n1 );
int i2 = quad->GetNodeIndex( n2 );
row1.clear(); row2.clear();
row1.push_back( n1 );
if ( alongN1N2 )
{
row1.push_back( n2 );
row2.push_back( oppositeNode( quad, i2 ));
row2.push_back( n1 = oppositeNode( quad, i1 ));
}
else
{
row2.push_back( n2 );
row1.push_back( n2 = oppositeNode( quad, i2 ));
row2.push_back( n1 = oppositeNode( quad, i1 ));
}
_NodeDescriptor nDesc( row1[1] );
if ( nDesc == _NodeDescriptor( row1[0] ))
return true; // row of 2 nodes
// Find the rest nodes
TIDSortedElemSet emptySet, avoidSet;
//while ( !isCornerNode( n2 ))
while ( nDesc == _NodeDescriptor( n2 ))
{
avoidSet.clear(); avoidSet.insert( quad );
quad = SMESH_MeshEditor::FindFaceInSet( n1, n2, emptySet, avoidSet, &i1, &i2 );
if ( !isQuadrangle( quad ))
return BAD_MESH_ERR;
row1.push_back( n2 = oppositeNode( quad, i1 ));
row2.push_back( n1 = oppositeNode( quad, i2 ));
}
return n1 != corner1;
}
//================================================================================
/*!
* \brief Return a corner face by a corner node
*/
//================================================================================
const SMDS_MeshElement* _BlockSide::getCornerFace(const SMDS_MeshNode* cornerNode) const
{
int x, y, isXMax, isYMax, found = 0;
for ( isXMax = 0; isXMax < 2; ++isXMax )
{
for ( isYMax = 0; isYMax < 2; ++isYMax )
{
x = isXMax ? _index._xSize-1 : 0;
y = isYMax ? _index._ySize-1 : 0;
found = ( getNode(x,y) == cornerNode );
if ( found ) break;
}
if ( found ) break;
}
if ( !found ) return 0;
int dx = isXMax ? -1 : +1;
int dy = isYMax ? -1 : +1;
const SMDS_MeshNode* n1 = getNode(x,y);
const SMDS_MeshNode* n2 = getNode(x+dx,y);
const SMDS_MeshNode* n3 = getNode(x,y+dy);
const SMDS_MeshNode* n4 = getNode(x+dx,y+dy);
return SMDS_Mesh::FindFace(n1, n2, n3, n4 );
}
//================================================================================
/*!
* \brief Checks own validity
*/
//================================================================================
bool _Block::isValid() const
{
bool ok = ( nbSides() == 6 );
// check only corners depending on side selection
EBoxSides adjacent[4] = { B_BOTTOM, B_RIGHT, B_TOP, B_LEFT };
EQuadEdge edgeAdj [4] = { Q_TOP, Q_RIGHT, Q_TOP, Q_RIGHT };
EQuadEdge edgeBack[4] = { Q_BOTTOM, Q_RIGHT, Q_TOP, Q_LEFT };
for ( int i=0; ok && i < NB_QUAD_SIDES; ++i )
{
SMESH_OrientedLink eBack = _side[ B_BACK ].edge( edgeBack[i] );
SMESH_OrientedLink eAdja = _side[ adjacent[i] ].edge( edgeAdj[i] );
ok = ( eBack == eAdja );
}
return ok;
}
} // namespace
//=======================================================================
//function : StdMeshers_HexaFromSkin_3D
//purpose :
//=======================================================================
StdMeshers_HexaFromSkin_3D::StdMeshers_HexaFromSkin_3D(int hypId, int studyId, SMESH_Gen* gen)
:SMESH_3D_Algo(hypId, studyId, gen)
{
MESSAGE("StdMeshers_HexaFromSkin_3D::StdMeshers_HexaFromSkin_3D");
_name = "HexaFromSkin_3D";
}
StdMeshers_HexaFromSkin_3D::~StdMeshers_HexaFromSkin_3D()
{
MESSAGE("StdMeshers_HexaFromSkin_3D::~StdMeshers_HexaFromSkin_3D");
}
//================================================================================
/*!
* \brief Main method, which generates hexaheda
*/
//================================================================================
bool StdMeshers_HexaFromSkin_3D::Compute(SMESH_Mesh & aMesh, SMESH_MesherHelper* aHelper)
{
_Skin skin;
int nbBlocks = skin.findBlocks(aMesh);
if ( nbBlocks == 0 )
return error( skin.error());
vector< vector< const SMDS_MeshNode* > > columns;
int x, xSize, y, ySize, z, zSize;
_Indexer colIndex;
for ( int i = 0; i < nbBlocks; ++i )
{
const _Block& block = skin.getBlock( i );
// ------------------------------------------
// Fill columns of nodes with existing nodes
// ------------------------------------------
xSize = block.getSide(B_BOTTOM).getHoriSize();
ySize = block.getSide(B_BOTTOM).getVertSize();
zSize = block.getSide(B_FRONT ).getVertSize();
int X = xSize - 1, Y = ySize - 1, Z = zSize - 1;
colIndex = _Indexer( xSize, ySize );
columns.resize( colIndex.size() );
// fill node columns by front and back box sides
for ( x = 0; x < xSize; ++x ) {
vector< const SMDS_MeshNode* >& column0 = columns[ colIndex( x, 0 )];
vector< const SMDS_MeshNode* >& column1 = columns[ colIndex( x, Y )];
column0.resize( zSize );
column1.resize( zSize );
for ( z = 0; z < zSize; ++z ) {
column0[ z ] = block.getSide(B_FRONT).node( x, z );
column1[ z ] = block.getSide(B_BACK) .node( x, z );
}
}
// fill node columns by left and right box sides
for ( y = 1; y < ySize-1; ++y ) {
vector< const SMDS_MeshNode* >& column0 = columns[ colIndex( 0, y )];
vector< const SMDS_MeshNode* >& column1 = columns[ colIndex( X, y )];
column0.resize( zSize );
column1.resize( zSize );
for ( z = 0; z < zSize; ++z ) {
column0[ z ] = block.getSide(B_LEFT) .node( y, z );
column1[ z ] = block.getSide(B_RIGHT).node( y, z );
}
}
// get nodes from top and bottom box sides
for ( x = 1; x < xSize-1; ++x ) {
for ( y = 1; y < ySize-1; ++y ) {
vector< const SMDS_MeshNode* >& column = columns[ colIndex( x, y )];
column.resize( zSize );
column.front() = block.getSide(B_BOTTOM).node( x, y );
column.back() = block.getSide(B_TOP) .node( x, y );
}
}
// ----------------------------
// Add internal nodes of a box
// ----------------------------
// projection points of internal nodes on box subshapes by which
// coordinates of internal nodes are computed
vector<gp_XYZ> pointOnShape( SMESH_Block::ID_Shell );
// projections on vertices are constant
pointOnShape[ SMESH_Block::ID_V000 ] = block.getSide(B_BOTTOM).xyz( 0, 0 );
pointOnShape[ SMESH_Block::ID_V100 ] = block.getSide(B_BOTTOM).xyz( X, 0 );
pointOnShape[ SMESH_Block::ID_V010 ] = block.getSide(B_BOTTOM).xyz( 0, Y );
pointOnShape[ SMESH_Block::ID_V110 ] = block.getSide(B_BOTTOM).xyz( X, Y );
pointOnShape[ SMESH_Block::ID_V001 ] = block.getSide(B_TOP).xyz( 0, 0 );
pointOnShape[ SMESH_Block::ID_V101 ] = block.getSide(B_TOP).xyz( X, 0 );
pointOnShape[ SMESH_Block::ID_V011 ] = block.getSide(B_TOP).xyz( 0, Y );
pointOnShape[ SMESH_Block::ID_V111 ] = block.getSide(B_TOP).xyz( X, Y );
for ( x = 1; x < xSize-1; ++x )
{
gp_XYZ params; // normalized parameters of internal node within a unit box
params.SetCoord( 1, x / double(X) );
for ( y = 1; y < ySize-1; ++y )
{
params.SetCoord( 2, y / double(Y) );
// column to fill during z loop
vector< const SMDS_MeshNode* >& column = columns[ colIndex( x, y )];
// projections on horizontal edges
pointOnShape[ SMESH_Block::ID_Ex00 ] = block.getSide(B_BOTTOM).xyz( x, 0 );
pointOnShape[ SMESH_Block::ID_Ex10 ] = block.getSide(B_BOTTOM).xyz( x, Y );
pointOnShape[ SMESH_Block::ID_E0y0 ] = block.getSide(B_BOTTOM).xyz( 0, y );
pointOnShape[ SMESH_Block::ID_E1y0 ] = block.getSide(B_BOTTOM).xyz( X, y );
pointOnShape[ SMESH_Block::ID_Ex01 ] = block.getSide(B_TOP).xyz( x, 0 );
pointOnShape[ SMESH_Block::ID_Ex11 ] = block.getSide(B_TOP).xyz( x, Y );
pointOnShape[ SMESH_Block::ID_E0y1 ] = block.getSide(B_TOP).xyz( 0, y );
pointOnShape[ SMESH_Block::ID_E1y1 ] = block.getSide(B_TOP).xyz( X, y );
// projections on horizontal sides
pointOnShape[ SMESH_Block::ID_Fxy0 ] = block.getSide(B_BOTTOM).xyz( x, y );
pointOnShape[ SMESH_Block::ID_Fxy1 ] = block.getSide(B_TOP) .xyz( x, y );
for ( z = 1; z < zSize-1; ++z ) // z loop
{
params.SetCoord( 3, z / double(Z) );
// projections on vertical edges
pointOnShape[ SMESH_Block::ID_E00z ] = block.getSide(B_FRONT).xyz( 0, z );
pointOnShape[ SMESH_Block::ID_E10z ] = block.getSide(B_FRONT).xyz( X, z );
pointOnShape[ SMESH_Block::ID_E01z ] = block.getSide(B_BACK).xyz( 0, z );
pointOnShape[ SMESH_Block::ID_E11z ] = block.getSide(B_BACK).xyz( X, z );
// projections on vertical sides
pointOnShape[ SMESH_Block::ID_Fx0z ] = block.getSide(B_FRONT).xyz( x, z );
pointOnShape[ SMESH_Block::ID_Fx1z ] = block.getSide(B_BACK) .xyz( x, z );
pointOnShape[ SMESH_Block::ID_F0yz ] = block.getSide(B_LEFT) .xyz( y, z );
pointOnShape[ SMESH_Block::ID_F1yz ] = block.getSide(B_RIGHT).xyz( y, z );
// compute internal node coordinates
gp_XYZ coords;
SMESH_Block::ShellPoint( params, pointOnShape, coords );
column[ z ] = aHelper->AddNode( coords.X(), coords.Y(), coords.Z() );
#ifdef DEB_GRID
// debug
//cout << "----------------------------------------------------------------------"<<endl;
//for ( int id = SMESH_Block::ID_V000; id < SMESH_Block::ID_Shell; ++id)
//{
// gp_XYZ p = pointOnShape[ id ];
// SMESH_Block::DumpShapeID( id,cout)<<" ( "<<p.X()<<", "<<p.Y()<<", "<<p.Z()<<" )"<<endl;
//}
//cout << "Params: ( "<< params.X()<<", "<<params.Y()<<", "<<params.Z()<<" )"<<endl;
//cout << "coords: ( "<< coords.X()<<", "<<coords.Y()<<", "<<coords.Z()<<" )"<<endl;
#endif
}
}
}
// ----------------
// Add hexahedrons
// ----------------
// find out orientation by a least distorted hexahedron (issue 0020855);
// the last is defined by evaluating sum of face normals of 8 corner hexahedrons
double badness = numeric_limits<double>::max();
bool isForw = true;
for ( int xMax = 0; xMax < 2; ++xMax )
for ( int yMax = 0; yMax < 2; ++yMax )
for ( int zMax = 0; zMax < 2; ++zMax )
{
x = xMax ? xSize-1 : 1;
y = yMax ? ySize-1 : 1;
z = zMax ? zSize-1 : 1;
vector< const SMDS_MeshNode* >& col00 = columns[ colIndex( x-1, y-1 )];
vector< const SMDS_MeshNode* >& col10 = columns[ colIndex( x , y-1 )];
vector< const SMDS_MeshNode* >& col01 = columns[ colIndex( x-1, y )];
vector< const SMDS_MeshNode* >& col11 = columns[ colIndex( x , y )];
const SMDS_MeshNode* n000 = col00[z-1];
const SMDS_MeshNode* n100 = col10[z-1];
const SMDS_MeshNode* n010 = col01[z-1];
const SMDS_MeshNode* n110 = col11[z-1];
const SMDS_MeshNode* n001 = col00[z];
const SMDS_MeshNode* n101 = col10[z];
const SMDS_MeshNode* n011 = col01[z];
const SMDS_MeshNode* n111 = col11[z];
SMDS_VolumeOfNodes probeVolume (n000,n010,n110,n100,
n001,n011,n111,n101);
SMDS_VolumeTool volTool( &probeVolume );
double Nx=0.,Ny=0.,Nz=0.;
for ( int iFace = 0; iFace < volTool.NbFaces(); ++iFace )
{
double nx,ny,nz;
volTool.GetFaceNormal( iFace, nx,ny,nz );
Nx += nx;
Ny += ny;
Nz += nz;
}
double quality = Nx*Nx + Ny*Ny + Nz*Nz;
if ( quality < badness )
{
badness = quality;
isForw = volTool.IsForward();
}
}
// add elements
for ( x = 0; x < xSize-1; ++x ) {
for ( y = 0; y < ySize-1; ++y ) {
vector< const SMDS_MeshNode* >& col00 = columns[ colIndex( x, y )];
vector< const SMDS_MeshNode* >& col10 = columns[ colIndex( x+1, y )];
vector< const SMDS_MeshNode* >& col01 = columns[ colIndex( x, y+1 )];
vector< const SMDS_MeshNode* >& col11 = columns[ colIndex( x+1, y+1 )];
// bottom face normal of a hexa mush point outside the volume
if ( isForw )
for ( z = 0; z < zSize-1; ++z )
aHelper->AddVolume(col00[z], col01[z], col11[z], col10[z],
col00[z+1], col01[z+1], col11[z+1], col10[z+1]);
else
for ( z = 0; z < zSize-1; ++z )
aHelper->AddVolume(col00[z], col10[z], col11[z], col01[z],
col00[z+1], col10[z+1], col11[z+1], col01[z+1]);
}
}
} // loop on blocks
return true;
}
//================================================================================
/*!
* \brief Evaluate nb of hexa
*/
//================================================================================
bool StdMeshers_HexaFromSkin_3D::Evaluate(SMESH_Mesh & aMesh,
const TopoDS_Shape & aShape,
MapShapeNbElems& aResMap)
{
_Skin skin;
int nbBlocks = skin.findBlocks(aMesh);
if ( nbBlocks == 0 )
return error( skin.error());
bool secondOrder = aMesh.NbFaces( ORDER_QUADRATIC );
int entity = secondOrder ? SMDSEntity_Quad_Hexa : SMDSEntity_Hexa;
vector<int>& nbByType = aResMap[ aMesh.GetSubMesh( aShape )];
if ( entity >= nbByType.size() )
nbByType.resize( SMDSEntity_Last, 0 );
for ( int i = 0; i < nbBlocks; ++i )
{
const _Block& block = skin.getBlock( i );
int nbX = block.getSide(B_BOTTOM).getHoriSize();
int nbY = block.getSide(B_BOTTOM).getVertSize();
int nbZ = block.getSide(B_FRONT ).getVertSize();
int nbHexa = (nbX-1) * (nbY-1) * (nbZ-1);
int nbNodes = (nbX-2) * (nbY-2) * (nbZ-2);
if ( secondOrder )
nbNodes +=
(nbX-2) * (nbY-2) * (nbZ-1) +
(nbX-2) * (nbY-1) * (nbZ-2) +
(nbX-1) * (nbY-2) * (nbZ-2);
nbByType[ entity ] += nbHexa;
nbByType[ SMDSEntity_Node ] += nbNodes;
}
return true;
}
//================================================================================
/*!
* \brief Abstract method must be defined but does nothing
*/
//================================================================================
bool StdMeshers_HexaFromSkin_3D::CheckHypothesis(SMESH_Mesh&, const TopoDS_Shape&,
Hypothesis_Status& aStatus)
{
aStatus = SMESH_Hypothesis::HYP_OK;
return true;
}
//================================================================================
/*!
* \brief Abstract method must be defined but just reports an error as this
* algo is not intended to work with shapes
*/
//================================================================================
bool StdMeshers_HexaFromSkin_3D::Compute(SMESH_Mesh&, const TopoDS_Shape&)
{
return error("Algorithm can't work with geometrical shapes");
}
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