surfaceSplitByTopology.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
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
    surfaceSplitByTopology
 
Group
    grpSurfaceUtilities
 
Description
    Strips any baffle parts of a surface.
 
    A baffle region is one which is reached by walking from an open edge, and
    stopping when a multiply connected edge is reached.
 
\*---------------------------------------------------------------------------*/
 
#include "argList.H"
#include "triSurface.H"
 
using namespace Foam;
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
int main(int argc, char *argv[])
{
    argList::addNote
    (
        "Strips any baffle parts of a surface.\n"
        "A baffle region is one which is reached by walking from an open edge,"
        " and stopping when a multiply connected edge is reached."
    );
 
    argList::noParallel();
    argList::validOptions.clear();
    argList::addArgument("input", "The input surface file");
    argList::addArgument("output", "The output surface file");
    argList args(argc, argv);
 
    const auto surfFileName = args.get<fileName>(1);
    Info<< "Reading surface from " << surfFileName << endl;
 
    const auto outFileName = args.get<fileName>(2);
    const fileName outFileBaseName = outFileName.lessExt();
    const word outExtension = outFileName.ext();
 
    // Load surface
    triSurface surf(surfFileName);
 
    bool anyZoneRemoved = false;
 
    label iterationNo = 0;
    label iterationLimit = 10;
 
    Info<< "Splitting off baffle parts " << endl;
 
    do
    {
        anyZoneRemoved = false;
 
        labelList faceZone;
 
        const labelListList& edFaces = surf.edgeFaces();
        const labelListList& faceEds = surf.faceEdges();
 
        boolList multipleEdges(edFaces.size(), false);
 
        forAll(multipleEdges, i)
        {
            if (edFaces[i].size() > 2)
            {
                multipleEdges[i] = true;
            }
        }
 
        label nZones = surf.markZones(multipleEdges, faceZone);
 
        if (nZones < 2)
        {
            break;
        }
 
        boolList nonBaffle(faceZone.size(), true);
        boolList baffle(faceZone.size(), true);
        labelList pointMap;
        labelList faceMap;
 
 
        for (label z = 0; z < nZones; z++)
        {
            bool keepZone = true;
 
            forAll(faceZone, f)
            {
                if (faceZone[f] == z)
                {
                    forAll(faceEds[f], fe)
                    {
                        if (edFaces[faceEds[f][fe]].size() < 2)
                        {
                            keepZone = false;
 
                            anyZoneRemoved = true;
 
                            break;
                        }
                    }
                }
 
                if (!keepZone)
                {
                    break;
                }
            }
 
            forAll(faceZone, f)
            {
                if (faceZone[f] == z)
                {
                    nonBaffle[f] = keepZone;
                    baffle[f] = !keepZone;
                }
            }
        }
 
        Info<< "    Iteration " << iterationNo << endl;
 
        triSurface baffleSurf = surf.subsetMesh(baffle, pointMap, faceMap);
 
        if (baffleSurf.size())
        {
            fileName bafflePartFileName =
            outFileBaseName
          + "_bafflePart_"
          + name(iterationNo)
          + "." + outExtension;
 
            Info<< "    Writing baffle part to " << bafflePartFileName << endl;
 
            baffleSurf.write(bafflePartFileName);
        }
 
        surf = surf.subsetMesh(nonBaffle, pointMap, faceMap);
 
        if (iterationNo == iterationLimit)
        {
            WarningInFunction
            << "Iteration limit of " << iterationLimit << "reached" << endl;
        }
 
        iterationNo++;
 
    } while (anyZoneRemoved && iterationNo < iterationLimit);
 
    Info<< "Writing new surface to " << outFileName << endl;
 
    surf.write(outFileName);
 
    labelList faceZone;
 
    const labelListList& edFaces = surf.edgeFaces();
 
    boolList multipleEdges(edFaces.size(), false);
 
    forAll(multipleEdges, i)
    {
        if (edFaces[i].size() > 2)
        {
            multipleEdges[i] = true;
        }
    }
 
    label nZones = surf.markZones(multipleEdges, faceZone);
 
    Info<< "Splitting remaining multiply connected parts" << endl;
 
    for (label z = 0; z < nZones; z++)
    {
        boolList include(faceZone.size(), false);
 
        forAll(faceZone, f)
        {
            if (faceZone[f] == z)
            {
                include[f] = true;
            }
        }
 
        triSurface zoneSurf = surf.subsetMesh(include);
 
        fileName remainingPartFileName =
            outFileBaseName
          + "_multiplePart_"
          + name(z)
          + "." + outExtension;
 
        Info<< "    Writing multiple part "
            << z << " to " << remainingPartFileName << endl;
 
        zoneSurf.write(remainingPartFileName);
    }
 
    Info << "End\n" << endl;
 
    return 0;
}
 
 
// ************************************************************************* //