/usr/include/freefoam/sampling/isoSurface.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::isoSurface
Description
A surface formed by the iso value.
After "Regularised Marching Tetrahedra: improved iso-surface extraction",
G.M. Treece, R.W. Prager and A.H. Gee.
Note:
- does tets without using cell centres/cell values. Not tested.
- regularisation can create duplicate triangles/non-manifold surfaces.
Current handling of those is bit ad-hoc for now and not perfect.
- regularisation does not do boundary points so as to preserve the
boundary perfectly.
- uses geometric merge with fraction of bounding box as distance.
- triangles can be between two cell centres so constant sampling
does not make sense.
- on empty patches behaves like zero gradient.
- does not do 2D correctly, creates non-flat iso surface.
- on processor boundaries might two overlapping (identical) triangles
(one from either side)
The handling on coupled patches is a bit complex. All fields
(values and coordinates) get rewritten so
- empty patches get zerogradient (value) and facecentre (coordinates)
- separated processor patch faces get interpolate (value) and facecentre
(coordinates). (this is already the default for cyclics)
- non-separated processor patch faces keep opposite value and cell centre
Now the triangle generation on non-separated processor patch faces
can use the neighbouring value. Any separated processor face or cyclic
face gets handled just like any boundary face.
SourceFiles
isoSurface.C
\*---------------------------------------------------------------------------*/
#ifndef isoSurface_H
#define isoSurface_H
#include <triSurface/triSurface.H>
#include <OpenFOAM/labelPair.H>
#include <meshTools/pointIndexHit.H>
#include <OpenFOAM/PackedBoolList.H>
#include <finiteVolume/volFields.H>
#include <finiteVolume/slicedVolFields.H>
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
class fvMesh;
/*---------------------------------------------------------------------------*\
Class isoSurface Declaration
\*---------------------------------------------------------------------------*/
class isoSurface
:
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 fvMesh& mesh_;
const scalarField& pVals_;
//- Input volScalarField with separated coupled patches rewritten
autoPtr<slicedVolScalarField> cValsPtr_;
//- Isosurface value
const scalar iso_;
//- Regularise?
const Switch regularise_;
//- When to merge points
const scalar mergeDistance_;
//- Whether face might be cut
List<cellCutType> faceCutType_;
//- 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
// Point synchronisation
//- Does tensor differ (to within mergeTolerance) from identity
bool noTransform(const tensor& tt) const;
//- Is patch a collocated (i.e. non-separated) coupled patch?
static bool collocatedPatch(const polyPatch&);
//- Per face whether is collocated
PackedBoolList collocatedFaces(const coupledPolyPatch&) const;
//- Take value at local point patchPointI and assign it to its
// correct place in patchValues (for transferral) and sharedValues
// (for reduction)
void insertPointData
(
const processorPolyPatch& pp,
const Map<label>& meshToShared,
const pointField& pointValues,
const label patchPointI,
pointField& patchValues,
pointField& sharedValues
) const;
//- Synchonise points on all non-separated coupled patches
void syncUnseparatedPoints
(
pointField& collapsedPoint,
const point& nullValue
) const;
//- Get location of iso value as fraction inbetween s0,s1
scalar isoFraction
(
const scalar s0,
const scalar s1
) const;
//- Check if any edge of a face is cut
bool isEdgeOfFaceCut
(
const scalarField& pVals,
const face& f,
const bool ownLower,
const bool neiLower
) const;
void getNeighbour
(
const labelList& boundaryRegion,
const volVectorField& meshC,
const volScalarField& cVals,
const label cellI,
const label faceI,
scalar& nbrValue,
point& nbrPoint
) const;
//- Set faceCutType,cellCutType.
void calcCutTypes
(
const labelList& boundaryRegion,
const volVectorField& meshC,
const volScalarField& cVals,
const scalarField& pVals
);
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 labelList& boundaryRegion,
const volVectorField& meshC,
const volScalarField& cVals,
const scalarField& pVals,
DynamicList<point>& snappedPoints,
labelList& snappedCc
) const;
//- Determine per point whether all near cuts can be snapped to single
// point.
void calcSnappedPoint
(
const PackedBoolList& isBoundaryPoint,
const labelList& boundaryRegion,
const volVectorField& meshC,
const volScalarField& cVals,
const scalarField& pVals,
DynamicList<point>& snappedPoints,
labelList& snappedPoint
) const;
//- Return input field with coupled (and empty) patch values rewritten
template<class Type>
tmp<SlicedGeometricField
<Type, fvPatchField, slicedFvPatchField, volMesh> >
adaptPatchFields
(
const GeometricField<Type, fvPatchField, volMesh>& fld
) const;
//- Generate single point by interpolation or snapping
template<class Type>
Type generatePoint
(
const scalar s0,
const Type& p0,
const bool hasSnap0,
const Type& snapP0,
const scalar s1,
const Type& p1,
const bool hasSnap1,
const Type& snapP1
) const;
template<class Type>
void generateTriPoints
(
const scalar s0,
const Type& p0,
const bool hasSnap0,
const Type& snapP0,
const scalar s1,
const Type& p1,
const bool hasSnap1,
const Type& snapP1,
const scalar s2,
const Type& p2,
const bool hasSnap2,
const Type& snapP2,
const scalar s3,
const Type& p3,
const bool hasSnap3,
const Type& snapP3,
DynamicList<Type>& points
) const;
template<class Type>
label generateFaceTriPoints
(
const volScalarField& cVals,
const scalarField& pVals,
const GeometricField<Type, fvPatchField, volMesh>& cCoords,
const Field<Type>& pCoords,
const DynamicList<Type>& snappedPoints,
const labelList& snappedCc,
const labelList& snappedPoint,
const label faceI,
const scalar neiVal,
const Type& neiPt,
const bool hasNeiSnap,
const Type& neiSnapPt,
DynamicList<Type>& triPoints,
DynamicList<label>& triMeshCells
) const;
template<class Type>
void generateTriPoints
(
const volScalarField& cVals,
const scalarField& pVals,
const GeometricField<Type, fvPatchField, volMesh>& 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
);
public:
//- Runtime type information
TypeName("isoSurface");
// Constructors
//- Construct from cell values and point values. Uses boundaryField
// for boundary values. Holds reference to cellIsoVals and
// pointIsoVals.
isoSurface
(
const volScalarField& cellIsoVals,
const scalarField& pointIsoVals,
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. Uses the references to the original
// fields used to create the iso surface.
template <class Type>
tmp<Field<Type> > interpolate
(
const GeometricField<Type, fvPatchField, volMesh>& cCoords,
const Field<Type>& pCoords
) const;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#ifdef NoRepository
# include "isoSurfaceTemplates.C"
#endif
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************ vim: set sw=4 sts=4 et: ************************ //
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