#include <Standard_ErrorHandler.hxx>
#include <Standard_Failure.hxx>
#include <TopExp_Explorer.hxx>
+#include <TopTools_IndexedMapOfShape.hxx>
#include <TopTools_MapIteratorOfMapOfShape.hxx>
#include <TopTools_MapOfShape.hxx>
#include <TopTools_SequenceOfShape.hxx>
const _FaceSide* GetSide(const int i) const;
int size() const { return myChildren.size(); }
int NbVertices() const;
+ int NbCommonVertices( const TopTools_MapOfShape& VV ) const;
TopoDS_Vertex FirstVertex() const;
TopoDS_Vertex LastVertex() const;
TopoDS_Vertex Vertex(int i) const;
public: //** Methods to find and orient faces of 6 sides of the box **//
//!< initialization
- bool Init(const TopoDS_Face& f);
+ bool Init(const TopoDS_Face& f, SMESH_Mesh& mesh );
//!< try to unite self with other face
- bool AddContinuousFace( const _QuadFaceGrid& f );
+ bool AddContinuousFace( const _QuadFaceGrid& f, const TopTools_MapOfShape& internalEdges );
//!< Try to set the side as bottom hirizontal side
bool SetBottomSide(const _FaceSide& side, int* sideIndex=0);
return true;
}
+namespace
+{
+
+ //================================================================================
+ /*!
+ * \brief Checks structure of a quadrangular mesh at the common VERTEX of two EDGEs.
+ * Returns true if there are two quadrangles near the VERTEX.
+ */
+ //================================================================================
+
+ bool isContinuousMesh(TopoDS_Edge E1,
+ TopoDS_Edge E2,
+ const TopoDS_Face& F,
+ const SMESH_Mesh& mesh)
+ {
+ if (E1.Orientation() > TopAbs_REVERSED) // INTERNAL
+ E1.Orientation( TopAbs_FORWARD );
+ if (E2.Orientation() > TopAbs_REVERSED) // INTERNAL
+ E2.Orientation( TopAbs_FORWARD );
+
+ TopoDS_Vertex V;
+ if ( !TopExp::CommonVertex( E1, E2, V )) return false;
+
+ const SMDS_MeshNode* n = SMESH_Algo::VertexNode( V, mesh.GetMeshDS() );
+ if ( !n ) return false;
+
+ SMESHDS_SubMesh* sm = mesh.GetSubMeshContaining( F )->GetSubMeshDS();
+ if ( !sm ) return false;
+
+ int nbQuads = 0;
+ SMDS_ElemIteratorPtr fIt = n->GetInverseElementIterator(SMDSAbs_Face);
+ while ( fIt->more() )
+ {
+ const SMDS_MeshElement* f = fIt->next();
+ if ( !sm->Contains( f )) continue;
+
+ if ( f->NbCornerNodes() == 4 )
+ ++nbQuads;
+ else
+ return false;
+ }
+ return nbQuads == 2;
+ }
+
+ //================================================================================
+ /*!
+ * \brief Finds VERTEXes located at block corners
+ */
+ //================================================================================
+
+ void getBlockCorners( SMESH_Mesh& mesh,
+ const TopoDS_Shape& shape,
+ TopTools_MapOfShape& cornerVV)
+ {
+ set<int> faceIDs; // ids of FACEs in the shape
+ TopExp_Explorer exp;
+ for ( exp.Init( shape, TopAbs_FACE ); exp.More(); exp.Next() )
+ faceIDs.insert( mesh.GetMeshDS()->ShapeToIndex( exp.Current() ));
+
+ TopTools_MapOfShape checkedVV;
+ for ( exp.Init( shape, TopAbs_VERTEX ); exp.More(); exp.Next() )
+ {
+ TopoDS_Vertex V = TopoDS::Vertex( exp.Current() );
+ if ( !checkedVV.Add( V )) continue;
+
+ const SMDS_MeshNode* n = SMESH_Algo::VertexNode( V, mesh.GetMeshDS() );
+ if ( !n ) continue;
+
+ int nbQuads = 0;
+ SMDS_ElemIteratorPtr fIt = n->GetInverseElementIterator(SMDSAbs_Face);
+ while ( fIt->more() )
+ {
+ const SMDS_MeshElement* f = fIt->next();
+ if ( !faceIDs.count( f->getshapeId() )) continue;
+
+ if ( f->NbCornerNodes() == 4 )
+ ++nbQuads;
+ else
+ nbQuads = 100;
+ }
+ if ( nbQuads == 3 )
+ cornerVV.Add( V );
+ }
+ }
+
+ //================================================================================
+ /*!
+ * \brief Return EDGEs dividing one box side
+ */
+ //================================================================================
+
+ bool getInternalEdges( SMESH_Mesh& mesh,
+ const TopoDS_Shape& shape,
+ const TopTools_MapOfShape& cornerVV,
+ TopTools_MapOfShape& internEE)
+ {
+ TopTools_IndexedMapOfShape subEE, subFF;
+ TopExp::MapShapes( shape, TopAbs_EDGE, subEE );
+ TopExp::MapShapes( shape, TopAbs_FACE, subFF );
+
+ TopoDS_Vertex VV[2];
+ TopTools_MapOfShape subChecked;
+ TopTools_MapIteratorOfMapOfShape vIt( cornerVV );
+ for ( ; vIt.More(); vIt.Next() )
+ {
+ TopoDS_Shape V0 = vIt.Key();
+ PShapeIteratorPtr riIt = SMESH_MesherHelper::GetAncestors( V0, mesh, TopAbs_EDGE );
+ while ( const TopoDS_Shape* riE = riIt->next() )
+ {
+ if ( !subEE.Contains( *riE ) || !subChecked.Add( *riE ))
+ continue;
+ TopoDS_Edge ridgeE = TopoDS::Edge( *riE );
+ while ( !ridgeE.IsNull() )
+ {
+ TopExp::Vertices( ridgeE, VV[0], VV[1] );
+ TopoDS_Shape V1 = VV[ V0.IsSame( VV[0] )];
+ if ( cornerVV.Contains( V1 ) )
+ break; // ridgeE reached a corner VERTEX
+
+ // detect internal EDGEs among those sharing V1. There can be 2, 3 or 4 EDGEs and
+ // number of internal EDGEs is N-2
+ TopoDS_Shape nextRidgeE;
+ PShapeIteratorPtr eIt = SMESH_MesherHelper::GetAncestors( V1, mesh, TopAbs_EDGE );
+ while ( const TopoDS_Shape* E = eIt->next() )
+ {
+ if ( E->IsSame( ridgeE ) || !subEE.Contains( *E ) || !subChecked.Add( *E ))
+ continue;
+ // look for FACEs sharing E and ridgeE
+ PShapeIteratorPtr fIt = SMESH_MesherHelper::GetAncestors( *E, mesh, TopAbs_FACE );
+ while ( const TopoDS_Shape* F = fIt->next() )
+ {
+ if ( !SMESH_MesherHelper::IsSubShape( ridgeE, *F ))
+ continue;
+ if ( isContinuousMesh( ridgeE, TopoDS::Edge( *E ), TopoDS::Face( *F ), mesh ))
+ {
+ nextRidgeE = *E;
+ }
+ else
+ {
+ internEE.Add( *E );
+ }
+ break;
+ }
+ }
+ // look for the next ridge EDGE
+ if ( nextRidgeE.IsNull() )
+ {
+ eIt = SMESH_MesherHelper::GetAncestors( V1, mesh, TopAbs_EDGE );
+ while ( const TopoDS_Shape* E = eIt->next() )
+ if ( !ridgeE.IsSame( *E ) && !internEE.Contains( *E ) )
+ {
+ nextRidgeE = *E;
+ break;
+ }
+ }
+ ridgeE = TopoDS::Edge( nextRidgeE );
+ V0 = V1;
+
+ if ( ridgeE.IsNull() )
+ return false;
+ } // check EDGEs around the last VERTEX of ridgeE
+ } // loop on ridge EDGEs around a corner VERTEX
+ } // loop on on corner VERTEXes
+
+ return true;
+ } // getInternalEdges()
+} // namespace
+
//================================================================================
/*!
* \brief Tries to find 6 sides of a box
bool StdMeshers_CompositeHexa_3D::findBoxFaces( const TopoDS_Shape& shape,
list< _QuadFaceGrid >& boxFaces,
+ SMESH_Mesh& mesh,
_QuadFaceGrid * & fBottom,
_QuadFaceGrid * & fTop,
_QuadFaceGrid * & fFront,
_QuadFaceGrid * & fLeft,
_QuadFaceGrid * & fRight)
{
+ TopTools_MapOfShape cornerVertices;
+ getBlockCorners( mesh, shape, cornerVertices );
+ if ( cornerVertices.Extent() != 8 )
+ return error( COMPERR_BAD_INPUT_MESH, "Can't find 8 corners of a block" );
+ TopTools_MapOfShape internalEdges;
+ if ( !getInternalEdges( mesh, shape, cornerVertices, internalEdges ))
+ return error( COMPERR_BAD_INPUT_MESH, "2D mesh is not suitable for i,j,k hexa meshing" );
+
list< _QuadFaceGrid >::iterator boxFace;
TopExp_Explorer exp;
int nbFaces = 0;
- for ( exp.Init( shape, TopAbs_FACE); exp.More(); exp.Next(), ++nbFaces )
+ for ( exp.Init( shape, TopAbs_FACE ); exp.More(); exp.Next(), ++nbFaces )
{
_QuadFaceGrid f;
- if ( !f.Init( TopoDS::Face( exp.Current() )))
+ if ( !f.Init( TopoDS::Face( exp.Current() ), mesh ))
return error (COMPERR_BAD_SHAPE);
- _QuadFaceGrid* prevContinuous = 0;
+ _QuadFaceGrid* prevContinuous = 0;
for ( boxFace = boxFaces.begin(); boxFace != boxFaces.end(); ++boxFace )
{
if ( prevContinuous )
{
- if ( prevContinuous->AddContinuousFace( *boxFace ))
+ if ( prevContinuous->AddContinuousFace( *boxFace, internalEdges ))
boxFace = --boxFaces.erase( boxFace );
}
- else if ( boxFace->AddContinuousFace( f ))
+ else if ( boxFace->AddContinuousFace( f, internalEdges ))
{
prevContinuous = & (*boxFace);
- }
+ }
}
if ( !prevContinuous )
boxFaces.push_back( f );
boxFaces.resize( 6 );
boxFace = boxFaces.begin();
for ( exp.Init( shape, TopAbs_FACE); exp.More(); exp.Next(), ++boxFace )
- boxFace->Init( TopoDS::Face( exp.Current() ) );
+ boxFace->Init( TopoDS::Face( exp.Current() ), mesh );
}
// ----------------------------------------
// Find out position of faces within a box
// -------------------------
list< _QuadFaceGrid > boxFaceContainer;
_QuadFaceGrid *fBottom, *fTop, *fFront, *fBack, *fLeft, *fRight;
- if ( ! findBoxFaces( theShape, boxFaceContainer,
+ if ( ! findBoxFaces( theShape, boxFaceContainer, theMesh,
fBottom, fTop, fFront, fBack, fLeft, fRight))
return false;
// -------------------------
list< _QuadFaceGrid > boxFaceContainer;
_QuadFaceGrid *fBottom, *fTop, *fFront, *fBack, *fLeft, *fRight;
- if ( ! findBoxFaces( theShape, boxFaceContainer,
+ if ( ! findBoxFaces( theShape, boxFaceContainer, theMesh,
fBottom, fTop, fFront, fBack, fLeft, fRight))
return false;
*/
//================================================================================
-bool _QuadFaceGrid::Init(const TopoDS_Face& f)
+bool _QuadFaceGrid::Init(const TopoDS_Face& f, SMESH_Mesh& mesh)
{
myFace = f;
mySides = _FaceSide();
else if ( SMESH_Algo::IsContinuous( sideEdges.front(), edges.back() )) {
sideEdges.splice( sideEdges.begin(), edges, --edges.end());
}
+ else if ( isContinuousMesh( sideEdges.back(), edges.front(), f, mesh )) {
+ sideEdges.splice( sideEdges.end(), edges, edges.begin());
+ }
+ else if ( isContinuousMesh( sideEdges.front(), edges.back(), f, mesh )) {
+ sideEdges.splice( sideEdges.begin(), edges, --edges.end());
+ }
else {
break;
}
*/
//================================================================================
-bool _QuadFaceGrid::AddContinuousFace( const _QuadFaceGrid& other )
+bool _QuadFaceGrid::AddContinuousFace( const _QuadFaceGrid& other,
+ const TopTools_MapOfShape& internalEdges)
{
for ( int i = 0; i < 4; ++i )
{
const _FaceSide& otherSide = other.GetSide( i );
int iMyCommon;
- if ( mySides.Contain( otherSide, &iMyCommon ) ) {
- // check if normals of two faces are collinear at all vertices of an otherSide
- const double angleTol = M_PI / 180. / 2.;
- int iV, nbV = otherSide.NbVertices(), nbCollinear = 0;
- for ( iV = 0; iV < nbV; ++iV )
+ if ( mySides.Contain( otherSide, &iMyCommon ) )
+ {
+ if ( internalEdges.Contains( otherSide.Edge( 0 )))
{
- TopoDS_Vertex v = otherSide.Vertex( iV );
- gp_Vec n1, n2;
- if ( !GetNormal( v, n1 ) || !other.GetNormal( v, n2 ))
- continue;
- if ( n1 * n2 < 0 )
- n1.Reverse();
- if ( n1.Angle(n2) < angleTol )
- nbCollinear++;
- else
- break;
- }
- if ( nbCollinear > 1 ) { // this face becomes composite if not yet is
DUMP_VERT("Cont 1", mySides.GetSide(iMyCommon)->FirstVertex());
DUMP_VERT("Cont 2", mySides.GetSide(iMyCommon)->LastVertex());
DUMP_VERT("Cont 3", otherSide.FirstVertex());
return myNbChildren + 1;
}
+//=======================================================================
+//function : NbCommonVertices
+//purpose : Returns number of my vertices common with the given ones
+//=======================================================================
+
+int _FaceSide::NbCommonVertices( const TopTools_MapOfShape& VV ) const
+{
+ int nbCommon = 0;
+ TopTools_MapIteratorOfMapOfShape vIt ( myVertices );
+ for ( ; vIt.More(); vIt.Next() )
+ nbCommon += ( VV.Contains( vIt.Key() ));
+
+ return nbCommon;
+}
+
//=======================================================================
//function : FirstVertex
-//purpose :
+//purpose :
//=======================================================================
TopoDS_Vertex _FaceSide::FirstVertex() const
