XmlToVtk.cpp

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//////////////////////////////////////////////////////////////////////////////
//
// File: XmlToVtk.cpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// License for the specific language governing rights and limitations under
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// Description: Output VTK file of XML mesh, optionally with Jacobian.
//
///////////////////////////////////////////////////////////////////////////////

#include <cstdlib>

#include <MultiRegions/ExpList.h>
#include <MultiRegions/ExpList1D.h>
#include <MultiRegions/ExpList2D.h>
#include <MultiRegions/ExpList3D.h>
#include <MultiRegions/ExpList3DHomogeneous1D.h>

using namespace Nektar;

int main(int argc, char *argv[])
{
    if(argc < 2)
    {
        cerr << "Usage: XmlToVtk  meshfile" << endl;
        exit(1);
    }

    LibUtilities::SessionReader::RegisterCmdLineFlag(
        "jacobian", "j", "Output Jacobian as scalar field");

    LibUtilities::SessionReaderSharedPtr vSession
        = LibUtilities::SessionReader::CreateInstance(argc, argv);

    bool jac = vSession->DefinesCmdLineArgument("jacobian");

    // Read in mesh from input file
    string meshfile(argv[argc-1]);
    SpatialDomains::MeshGraphSharedPtr graphShPt =
        SpatialDomains::MeshGraph::Read(vSession); //meshfile);

    // Set up Expansion information
    SpatialDomains::ExpansionMap emap = graphShPt->GetExpansions();
    SpatialDomains::ExpansionMapIter it;

    for (it = emap.begin(); it != emap.end(); ++it)
    {
        for (int i = 0; i < it->second->m_basisKeyVector.size(); ++i)
        {
            LibUtilities::BasisKey  tmp1 = it->second->m_basisKeyVector[i];
            LibUtilities::PointsKey tmp2 = tmp1.GetPointsKey();
            it->second->m_basisKeyVector[i] = LibUtilities::BasisKey(
                tmp1.GetBasisType(), tmp1.GetNumModes(),
                LibUtilities::PointsKey(tmp1.GetNumModes(),
                                        LibUtilities::ePolyEvenlySpaced));
        }
    }

    // Define Expansion
    int expdim  = graphShPt->GetMeshDimension();
    Array<OneD, MultiRegions::ExpListSharedPtr> Exp(1);

    switch(expdim)
    {
        case 1:
        {
            MultiRegions::ExpList1DSharedPtr Exp1D;
            Exp1D = MemoryManager<MultiRegions::ExpList1D>
                ::AllocateSharedPtr(vSession,graphShPt);
            Exp[0] = Exp1D;
            break;
        }
        case 2:
        {
            if(vSession->DefinesSolverInfo("HOMOGENEOUS"))
            {
                std::string HomoStr = vSession->GetSolverInfo("HOMOGENEOUS");
                MultiRegions::ExpList3DHomogeneous1DSharedPtr Exp3DH1;

                ASSERTL0(
                    HomoStr == "HOMOGENEOUS1D" || HomoStr == "Homogeneous1D" ||
                    HomoStr == "1D"            || HomoStr == "Homo1D",
                    "Only 3DH1D supported for XML output currently.");

                int nplanes;
                vSession->LoadParameter("HomModesZ", nplanes);

                // choose points to be at evenly spaced points at nplanes + 1
                // points
                const LibUtilities::PointsKey Pkey(
                    nplanes + 1, LibUtilities::ePolyEvenlySpaced);
                const LibUtilities::BasisKey  Bkey(
                    LibUtilities::eFourier, nplanes, Pkey);
                NekDouble lz = vSession->GetParameter("LZ");

                Exp3DH1 = MemoryManager<MultiRegions::ExpList3DHomogeneous1D>
                    ::AllocateSharedPtr(
                        vSession, Bkey, lz, false, false, graphShPt);
                Exp[0] = Exp3DH1;
            }
            else
            {
                MultiRegions::ExpList2DSharedPtr Exp2D;
                Exp2D = MemoryManager<MultiRegions::ExpList2D>
                    ::AllocateSharedPtr(vSession,graphShPt);
                Exp[0] =  Exp2D;
            }
            break;
        }
        case 3:
        {
            MultiRegions::ExpList3DSharedPtr Exp3D;
            Exp3D = MemoryManager<MultiRegions::ExpList3D>
                ::AllocateSharedPtr(vSession,graphShPt);
            Exp[0] =  Exp3D;
            break;
        }
        default:
        {
            ASSERTL0(false,"Expansion dimension not recognised");
            break;
        }
    }

    // Write out VTK file.
    string   outname(strtok(argv[argc-1],"."));
    outname += ".vtu";
    ofstream outfile(outname.c_str());

    Exp[0]->WriteVtkHeader(outfile);

    if (jac)
    {
        // Find minimum Jacobian.
        Array<OneD, NekDouble> tmp;
        Array<OneD, NekDouble> x0 (Exp[0]->GetNpoints());
        Array<OneD, NekDouble> x1 (Exp[0]->GetNpoints());
        Array<OneD, NekDouble> x2 (Exp[0]->GetNpoints());
        Exp[0]->GetCoords(x0, x1, x2);

        // Write out field containing Jacobian.
        for(int i = 0; i < Exp[0]->GetExpSize(); ++i)
        {
            LocalRegions::ExpansionSharedPtr e = Exp[0]->GetExp(i);
            SpatialDomains::GeomFactorsSharedPtr g = e->GetMetricInfo();
            LibUtilities::PointsKeyVector ptsKeys = e->GetPointsKeys();
            unsigned int npts = e->GetTotPoints();

            if (g->GetGtype() == SpatialDomains::eDeformed)
            {
                Vmath::Vcopy(npts, g->GetJac(ptsKeys), 1, 
                                   tmp = Exp[0]->UpdatePhys()
                                        + Exp[0]->GetPhys_Offset(i), 1);
            }
            else
            {
                Vmath::Fill (npts, g->GetJac(ptsKeys)[0], 
                                   tmp = Exp[0]->UpdatePhys()
                                        + Exp[0]->GetPhys_Offset(i), 1);
            }

            Exp[0]->WriteVtkPieceHeader(outfile, i);
            Exp[0]->WriteVtkPieceData  (outfile, i, "Jac");
            Exp[0]->WriteVtkPieceFooter(outfile, i);
        }

        unsigned int n
            = Vmath::Imin(Exp[0]->GetNpoints(), Exp[0]->GetPhys(), 1);
        cout << "- Minimum Jacobian: "
             << Vmath::Vmin(Exp[0]->GetNpoints(), Exp[0]->GetPhys(), 1)
             << " at coords (" << x0[n] << ", " << x1[n] << ", " << x2[n] << ")"
             << endl;

    }
    else
    {
        // For each field write header and footer, since there is no field data.
        for(int i = 0; i < Exp[0]->GetExpSize(); ++i)
        {
            Exp[0]->WriteVtkPieceHeader(outfile, i);
            Exp[0]->WriteVtkPieceFooter(outfile, i);
        }
    }

    Exp[0]->WriteVtkFooter(outfile);

    return 0;
}