/usr/include/freefoam/sampling/isoSurfaceCell.H is in libfreefoam-dev 0.1.0+dfsg-1build1.
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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM 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 General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Class
Foam::isoSurfaceCell
Description
A surface formed by the iso value.
After "Polygonising A Scalar Field Using Tetrahedrons", Paul Bourke
and
"Regularised Marching Tetrahedra: improved iso-surface extraction",
G.M. Treece, R.W. Prager and A.H. Gee.
See isoSurface. This is a variant which does tetrahedrisation from
triangulation of face to cell centre instead of edge of face to two
neighbouring cell centres. This gives much lower quality triangles
but they are local to a cell.
SourceFiles
isoSurfaceCell.C
\*---------------------------------------------------------------------------*/
#ifndef isoSurfaceCell_H
#define isoSurfaceCell_H
#include <triSurface/triSurface.H>
#include <OpenFOAM/labelPair.H>
#include <meshTools/pointIndexHit.H>
#include <OpenFOAM/PackedBoolList.H>
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
class polyMesh;
/*---------------------------------------------------------------------------*\
Class isoSurfaceCell Declaration
\*---------------------------------------------------------------------------*/
class isoSurfaceCell
:
public triSurface
{
// Private data
enum segmentCutType
{
NEARFIRST, // intersection close to e.first()
NEARSECOND, // ,, e.second()
NOTNEAR // no intersection
};
enum cellCutType
{
NOTCUT, // not cut
SPHERE, // all edges to cell centre cut
CUT // normal cut
};
//- Reference to mesh
const polyMesh& mesh_;
//- isoSurfaceCell value
const scalar iso_;
//- When to merge points
const scalar mergeDistance_;
//- Whether cell might be cut
List<cellCutType> cellCutType_;
//- Estimated number of cut cells
label nCutCells_;
//- For every triangle the original cell in mesh
labelList meshCells_;
//- For every unmerged triangle point the point in the triSurface
labelList triPointMergeMap_;
// Private Member Functions
//- Get location of iso value as fraction inbetween s0,s1
scalar isoFraction
(
const scalar s0,
const scalar s1
) const;
//List<triFace> triangulate(const face& f) const;
//- Determine whether cell is cut
cellCutType calcCutType
(
const PackedBoolList&,
const scalarField& cellValues,
const scalarField& pointValues,
const label
) const;
void calcCutTypes
(
const PackedBoolList&,
const scalarField& cellValues,
const scalarField& pointValues
);
static labelPair findCommonPoints
(
const labelledTri&,
const labelledTri&
);
static point calcCentre(const triSurface&);
static pointIndexHit collapseSurface
(
pointField& localPoints,
DynamicList<labelledTri, 64>& localTris
);
//- Determine per cc whether all near cuts can be snapped to single
// point.
void calcSnappedCc
(
const PackedBoolList& isTet,
const scalarField& cVals,
const scalarField& pVals,
DynamicList<point>& triPoints,
labelList& snappedCc
) const;
//- Generate triangles for face connected to pointI
void genPointTris
(
const scalarField& cellValues,
const scalarField& pointValues,
const label pointI,
const face& f,
const label cellI,
DynamicList<point, 64>& localTriPoints
) const;
//- Generate triangles for tet connected to pointI
void genPointTris
(
const scalarField& pointValues,
const label pointI,
const label cellI,
DynamicList<point, 64>& localTriPoints
) const;
//- Determine per point whether all near cuts can be snapped to single
// point.
void calcSnappedPoint
(
const PackedBoolList& isBoundaryPoint,
const PackedBoolList& isTet,
const scalarField& cVals,
const scalarField& pVals,
DynamicList<point>& triPoints,
labelList& snappedPoint
) const;
//- Generate single point by interpolation or snapping
template<class Type>
Type generatePoint
(
const DynamicList<Type>& snappedPoints,
const scalar s0,
const Type& p0,
const label p0Index,
const scalar s1,
const Type& p1,
const label p1Index
) const;
template<class Type>
void generateTriPoints
(
const DynamicList<Type>& snapped,
const scalar s0,
const Type& p0,
const label p0Index,
const scalar s1,
const Type& p1,
const label p1Index,
const scalar s2,
const Type& p2,
const label p2Index,
const scalar s3,
const Type& p3,
const label p3Index,
DynamicList<Type>& points
) const;
template<class Type>
void generateTriPoints
(
const scalarField& cVals,
const scalarField& pVals,
const Field<Type>& cCoords,
const Field<Type>& pCoords,
const DynamicList<Type>& snappedPoints,
const labelList& snappedCc,
const labelList& snappedPoint,
DynamicList<Type>& triPoints,
DynamicList<label>& triMeshCells
) const;
triSurface stitchTriPoints
(
const bool checkDuplicates,
const List<point>& triPoints,
labelList& triPointReverseMap, // unmerged to merged point
labelList& triMap // merged to unmerged triangle
) const;
//- Check single triangle for (topological) validity
static bool validTri(const triSurface&, const label);
//- Determine edge-face addressing
void calcAddressing
(
const triSurface& surf,
List<FixedList<label, 3> >& faceEdges,
labelList& edgeFace0,
labelList& edgeFace1,
Map<labelList>& edgeFacesRest
) const;
//- Determine orientation
static void walkOrientation
(
const triSurface& surf,
const List<FixedList<label, 3> >& faceEdges,
const labelList& edgeFace0,
const labelList& edgeFace1,
const label seedTriI,
labelList& flipState
);
//- Orient surface
static void orientSurface
(
triSurface&,
const List<FixedList<label, 3> >& faceEdges,
const labelList& edgeFace0,
const labelList& edgeFace1,
const Map<labelList>& edgeFacesRest
);
//- Is triangle (given by 3 edges) not fully connected?
static bool danglingTriangle
(
const FixedList<label, 3>& fEdges,
const labelList& edgeFace1
);
//- Mark all non-fully connected triangles
static label markDanglingTriangles
(
const List<FixedList<label, 3> >& faceEdges,
const labelList& edgeFace0,
const labelList& edgeFace1,
const Map<labelList>& edgeFacesRest,
boolList& keepTriangles
);
static triSurface subsetMesh
(
const triSurface& s,
const labelList& newToOldFaces,
labelList& oldToNewPoints,
labelList& newToOldPoints
);
//- Combine all triangles inside a cell into a minimal triangulation
void combineCellTriangles();
public:
//- Runtime type information
TypeName("isoSurfaceCell");
// Constructors
//- Construct from dictionary
isoSurfaceCell
(
const polyMesh& mesh,
const scalarField& cellValues,
const scalarField& pointValues,
const scalar iso,
const bool regularise,
const scalar mergeTol = 1E-6 // fraction of bounding box
);
// Member Functions
//- For every face original cell in mesh
const labelList& meshCells() const
{
return meshCells_;
}
//- For every unmerged triangle point the point in the triSurface
const labelList triPointMergeMap() const
{
return triPointMergeMap_;
}
//- Interpolates cCoords,pCoords. Takes the original fields
// used to create the iso surface.
template <class Type>
tmp<Field<Type> > interpolate
(
const scalarField& cVals,
const scalarField& pVals,
const Field<Type>& cCoords,
const Field<Type>& pCoords
) const;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#ifdef NoRepository
# include "isoSurfaceCellTemplates.C"
#endif
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************ vim: set sw=4 sts=4 et: ************************ //
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