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|
/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
\\/ 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/>.
Application
surfaceLambdaMuSmooth
Description
Smooths a surface using lambda/mu smoothing.
To get laplacian smoothing, set lambda to the relaxation factor and mu to
zero.
Provide an edgeMesh file containing points that are not to be moved during
smoothing in order to preserve features.
lambda/mu smoothing: G. Taubin, IBM Research report Rc-19923 (02/01/95)
"A signal processing approach to fair surface design"
\*---------------------------------------------------------------------------*/
#include "argList.H"
#include "boundBox.H"
#include "edgeMesh.H"
#include "matchPoints.H"
#include "MeshedSurfaces.H"
using namespace Foam;
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
tmp<pointField> avg
(
const meshedSurface& s,
const PackedBoolList& fixedPoints
)
{
const labelListList& pointEdges = s.pointEdges();
tmp<pointField> tavg(new pointField(s.nPoints(), Zero));
pointField& avg = tavg.ref();
forAll(pointEdges, vertI)
{
vector& avgPos = avg[vertI];
if (fixedPoints[vertI])
{
avgPos = s.localPoints()[vertI];
}
else
{
const labelList& pEdges = pointEdges[vertI];
forAll(pEdges, myEdgeI)
{
const edge& e = s.edges()[pEdges[myEdgeI]];
label otherVertI = e.otherVertex(vertI);
avgPos += s.localPoints()[otherVertI];
}
avgPos /= pEdges.size();
}
}
return tavg;
}
void getFixedPoints
(
const edgeMesh& feMesh,
const pointField& points,
PackedBoolList& fixedPoints
)
{
scalarList matchDistance(feMesh.points().size(), 1e-1);
labelList from0To1;
bool matchedAll = matchPoints
(
feMesh.points(),
points,
matchDistance,
false,
from0To1
);
if (!matchedAll)
{
WarningInFunction
<< "Did not match all feature points to points on the surface"
<< endl;
}
forAll(from0To1, fpI)
{
if (from0To1[fpI] != -1)
{
fixedPoints[from0To1[fpI]] = true;
}
}
}
// Main program:
int main(int argc, char *argv[])
{
argList::noParallel();
argList::validOptions.clear();
argList::validArgs.append("surfaceFile");
argList::validArgs.append("lambda (0..1)");
argList::validArgs.append("mu (0..1)");
argList::validArgs.append("iterations");
argList::validArgs.append("output surfaceFile");
argList::addOption
(
"featureFile",
"fix points from a file containing feature points and edges"
);
argList args(argc, argv);
const fileName surfFileName = args[1];
const scalar lambda = args.argRead<scalar>(2);
const scalar mu = args.argRead<scalar>(3);
const label iters = args.argRead<label>(4);
const fileName outFileName = args[5];
if (lambda < 0 || lambda > 1)
{
FatalErrorInFunction
<< lambda << endl
<< "0: no change 1: move vertices to average of neighbours"
<< exit(FatalError);
}
if (mu < 0 || mu > 1)
{
FatalErrorInFunction
<< mu << endl
<< "0: no change 1: move vertices to average of neighbours"
<< exit(FatalError);
}
Info<< "lambda : " << lambda << nl
<< "mu : " << mu << nl
<< "Iters : " << iters << nl
<< "Reading surface from " << surfFileName << " ..." << endl;
meshedSurface surf1(surfFileName);
Info<< "Faces : " << surf1.size() << nl
<< "Vertices : " << surf1.nPoints() << nl
<< "Bounding Box: " << boundBox(surf1.localPoints()) << endl;
PackedBoolList fixedPoints(surf1.localPoints().size(), false);
if (args.optionFound("featureFile"))
{
const fileName featureFileName(args.option("featureFile"));
Info<< "Reading features from " << featureFileName << " ..." << endl;
edgeMesh feMesh(featureFileName);
getFixedPoints(feMesh, surf1.localPoints(), fixedPoints);
Info<< "Number of fixed points on surface = " << fixedPoints.count()
<< endl;
}
pointField newPoints(surf1.localPoints());
for (label iter = 0; iter < iters; iter++)
{
// Lambda
{
pointField newLocalPoints
(
(1 - lambda)*surf1.localPoints()
+ lambda*avg(surf1, fixedPoints)
);
pointField newPoints(surf1.points());
UIndirectList<point>(newPoints, surf1.meshPoints()) =
newLocalPoints;
surf1.movePoints(newPoints);
}
// Mu
if (mu != 0)
{
pointField newLocalPoints
(
(1 + mu)*surf1.localPoints()
- mu*avg(surf1, fixedPoints)
);
pointField newPoints(surf1.points());
UIndirectList<point>(newPoints, surf1.meshPoints()) =
newLocalPoints;
surf1.movePoints(newPoints);
}
}
Info<< "Writing surface to " << outFileName << " ..." << endl;
surf1.write(outFileName);
Info<< "End\n" << endl;
return 0;
}
// ************************************************************************* //
|
