/usr/include/freefoam/OpenFOAM/PrimitivePatchProjectPoints.C 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/>.
Description
For every point on the patch find the closest face on the target side.
Return a target face label for each patch point
\*---------------------------------------------------------------------------*/
#include <OpenFOAM/boolList.H>
#include <OpenFOAM/PointHit_.H>
#include <OpenFOAM/objectHit.H>
#include <OpenFOAM/bandCompression.H>
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
template
<
class Face,
template<class> class FaceList,
class PointField,
class PointType
>
template <class ToPatch>
Foam::List<Foam::objectHit>
Foam::PrimitivePatch<Face, FaceList, PointField, PointType>::
projectPoints
(
const ToPatch& targetPatch,
const Field<PointType>& projectionDirection,
const intersection::algorithm alg,
const intersection::direction dir
) const
{
// The current patch is slave, i.e. it is being projected onto the target
if (projectionDirection.size() != nPoints())
{
FatalErrorIn
(
"PrimitivePatch<Face, FaceList, PointField, PointType>::"
"projectPoints(const PrimitivePatch& "
", const Field<PointType>&) const"
) << "Projection direction field does not correspond to "
<< "patch points." << endl
<< "Size: " << projectionDirection.size()
<< " Number of points: " << nPoints()
<< abort(FatalError);
}
const labelList& slavePointOrder = localPointOrder();
const labelList& slaveMeshPoints = meshPoints();
// Result
List<objectHit> result(nPoints());
const labelListList& masterFaceFaces = targetPatch.faceFaces();
const ToPatch& masterFaces = targetPatch;
const Field<PointType>& masterPoints = targetPatch.points();
// Estimate face centre of target side
Field<PointType> masterFaceCentres(targetPatch.size());
forAll (masterFaceCentres, faceI)
{
masterFaceCentres[faceI] =
average(masterFaces[faceI].points(masterPoints));
}
// Algorithm:
// Loop through all points of the slave side. For every point find the
// radius for the current contact face. If the contact point falls inside
// the face and the radius is smaller than for all neighbouring faces,
// the contact is found. If not, visit the neighbour closest to the
// calculated contact point. If a single master face is visited more than
// twice, initiate n-squared search.
label curFace = 0;
label nNSquaredSearches = 0;
forAll (slavePointOrder, pointI)
{
// Pick up slave point and direction
const label curLocalPointLabel = slavePointOrder[pointI];
const PointType& curPoint =
points_[slaveMeshPoints[curLocalPointLabel]];
const PointType& curProjectionDir =
projectionDirection[curLocalPointLabel];
bool closer;
boolList visitedTargetFace(targetPatch.size(), false);
bool doNSquaredSearch = false;
bool foundEligible = false;
scalar sqrDistance = GREAT;
// Force the full search for the first point to ensure good
// starting face
if (pointI == 0)
{
doNSquaredSearch = true;
}
else
{
do
{
closer = false;
doNSquaredSearch = false;
// Calculate intersection with curFace
PointHit<PointType> curHit =
masterFaces[curFace].ray
(
curPoint,
curProjectionDir,
masterPoints,
alg,
dir
);
visitedTargetFace[curFace] = true;
if (curHit.hit())
{
result[curLocalPointLabel] = objectHit(true, curFace);
break;
}
else
{
// If a new miss is eligible, it is closer than
// any previous eligible miss (due to surface walk)
// Only grab the miss if it is eligible
if (curHit.eligibleMiss())
{
foundEligible = true;
result[curLocalPointLabel] = objectHit(false, curFace);
}
// Find the next likely face for intersection
// Calculate the miss point on the plane of the
// face. This is cooked (illogical!) for fastest
// surface walk.
//
PointType missPlanePoint =
curPoint + curProjectionDir*curHit.distance();
const labelList& masterNbrs = masterFaceFaces[curFace];
sqrDistance =
magSqr(missPlanePoint - masterFaceCentres[curFace]);
forAll (masterNbrs, nbrI)
{
if
(
magSqr
(
missPlanePoint
- masterFaceCentres[masterNbrs[nbrI]]
)
<= sqrDistance
)
{
closer = true;
curFace = masterNbrs[nbrI];
}
}
if (visitedTargetFace[curFace])
{
// This face has already been visited.
// Execute n-squared search
doNSquaredSearch = true;
break;
}
}
if (debug) Info<< ".";
} while (closer);
}
if
(
doNSquaredSearch || !foundEligible
)
{
nNSquaredSearches++;
if (debug)
{
Info<< "p " << curLocalPointLabel << ": ";
}
result[curLocalPointLabel] = objectHit(false, -1);
scalar minDistance = GREAT;
forAll (masterFaces, faceI)
{
PointHit<PointType> curHit =
masterFaces[faceI].ray
(
curPoint,
curProjectionDir,
masterPoints,
alg,
dir
);
if (curHit.hit())
{
result[curLocalPointLabel] = objectHit(true, faceI);
curFace = faceI;
break;
}
else if (curHit.eligibleMiss())
{
// Calculate min distance
scalar missDist =
Foam::mag(curHit.missPoint() - curPoint);
if (missDist < minDistance)
{
minDistance = missDist;
result[curLocalPointLabel] = objectHit(false, faceI);
curFace = faceI;
}
}
}
if (debug)
{
Info << result[curLocalPointLabel] << nl;
}
}
else
{
if (debug) Info<< "x";
}
}
if (debug)
{
Info<< nl << "Executed " << nNSquaredSearches
<< " n-squared searches out of total of "
<< nPoints() << endl;
}
return result;
}
template
<
class Face,
template<class> class FaceList,
class PointField,
class PointType
>
template <class ToPatch>
Foam::List<Foam::objectHit>
Foam::PrimitivePatch<Face, FaceList, PointField, PointType>::
projectFaceCentres
(
const ToPatch& targetPatch,
const Field<PointType>& projectionDirection,
const intersection::algorithm alg,
const intersection::direction dir
) const
{
// The current patch is slave, i.e. it is being projected onto the target
if (projectionDirection.size() != this->size())
{
FatalErrorIn
(
"labelList PrimitivePatch<Face, FaceList, PointField, PointType>::"
"projectFaceCentres(const PrimitivePatch& "
", const Field<PointType>&) const"
) << "Projection direction field does not correspond to patch faces."
<< endl << "Size: " << projectionDirection.size()
<< " Number of points: " << this->size()
<< abort(FatalError);
}
labelList slaveFaceOrder = bandCompression(faceFaces());
// calculate master face centres
Field<PointType> masterFaceCentres(targetPatch.size());
const labelListList& masterFaceFaces = targetPatch.faceFaces();
const ToPatch& masterFaces = targetPatch;
const typename ToPatch::PointFieldType& masterPoints = targetPatch.points();
forAll (masterFaceCentres, faceI)
{
masterFaceCentres[faceI] =
masterFaces[faceI].centre(masterPoints);
}
// Result
List<objectHit> result(this->size());
const PrimitivePatch<Face, FaceList, PointField, PointType>& slaveFaces = *this;
const PointField& slaveGlobalPoints = points();
// Algorithm:
// Loop through all points of the slave side. For every point find the
// radius for the current contact face. If the contact point falls inside
// the face and the radius is smaller than for all neighbouring faces,
// the contact is found. If not, visit the neighbour closest to the
// calculated contact point. If a single master face is visited more than
// twice, initiate n-squared search.
label curFace = 0;
label nNSquaredSearches = 0;
forAll (slaveFaceOrder, faceI)
{
// pick up slave point and direction
const label curLocalFaceLabel = slaveFaceOrder[faceI];
const point& curFaceCentre =
slaveFaces[curLocalFaceLabel].centre(slaveGlobalPoints);
const vector& curProjectionDir =
projectionDirection[curLocalFaceLabel];
bool closer;
boolList visitedTargetFace(targetPatch.size(), false);
bool doNSquaredSearch = false;
bool foundEligible = false;
scalar sqrDistance = GREAT;
// Force the full search for the first point to ensure good
// starting face
if (faceI == 0)
{
doNSquaredSearch = true;
}
else
{
do
{
closer = false;
doNSquaredSearch = false;
// Calculate intersection with curFace
PointHit<PointType> curHit =
masterFaces[curFace].ray
(
curFaceCentre,
curProjectionDir,
masterPoints,
alg,
dir
);
visitedTargetFace[curFace] = true;
if (curHit.hit())
{
result[curLocalFaceLabel] = objectHit(true, curFace);
break;
}
else
{
// If a new miss is eligible, it is closer than
// any previous eligible miss (due to surface walk)
// Only grab the miss if it is eligible
if (curHit.eligibleMiss())
{
foundEligible = true;
result[curLocalFaceLabel] = objectHit(false, curFace);
}
// Find the next likely face for intersection
// Calculate the miss point. This is
// cooked (illogical!) for fastest surface walk.
//
PointType missPlanePoint =
curFaceCentre + curProjectionDir*curHit.distance();
sqrDistance =
magSqr(missPlanePoint - masterFaceCentres[curFace]);
const labelList& masterNbrs = masterFaceFaces[curFace];
forAll (masterNbrs, nbrI)
{
if
(
magSqr
(
missPlanePoint
- masterFaceCentres[masterNbrs[nbrI]]
)
<= sqrDistance
)
{
closer = true;
curFace = masterNbrs[nbrI];
}
}
if (visitedTargetFace[curFace])
{
// This face has already been visited.
// Execute n-squared search
doNSquaredSearch = true;
break;
}
}
if (debug) Info<< ".";
} while (closer);
}
if (doNSquaredSearch || !foundEligible)
{
nNSquaredSearches++;
if (debug)
{
Info<< "p " << curLocalFaceLabel << ": ";
}
result[curLocalFaceLabel] = objectHit(false, -1);
scalar minDistance = GREAT;
forAll (masterFaces, faceI)
{
PointHit<PointType> curHit =
masterFaces[faceI].ray
(
curFaceCentre,
curProjectionDir,
masterPoints,
alg,
dir
);
if (curHit.hit())
{
result[curLocalFaceLabel] = objectHit(true, faceI);
curFace = faceI;
break;
}
else if (curHit.eligibleMiss())
{
// Calculate min distance
scalar missDist =
Foam::mag(curHit.missPoint() - curFaceCentre);
if (missDist < minDistance)
{
minDistance = missDist;
result[curLocalFaceLabel] = objectHit(false, faceI);
curFace = faceI;
}
}
}
if (debug)
{
Info << result[curLocalFaceLabel] << nl;
}
}
else
{
if (debug) Info<< "x";
}
}
if (debug)
{
Info<< nl << "Executed " << nNSquaredSearches
<< " n-squared searches out of total of "
<< this->size() << endl;
}
return result;
}
// ************************ vim: set sw=4 sts=4 et: ************************ //
|