Nektar::Utilities::InputSwan Class Reference

Converter for Swansea mesh format. More...

#include <InputSwan.h>

Inheritance diagram for Nektar::Utilities::InputSwan:

Public Member Functions
	InputSwan (NekMeshUtils::MeshSharedPtr m)
virtual	~InputSwan ()
virtual void	Process ()
	Populate and validate required data structures. More...
Public Member Functions inherited from Nektar::NekMeshUtils::InputModule
NEKMESHUTILS_EXPORT	InputModule (MeshSharedPtr p_m)
NEKMESHUTILS_EXPORT void	OpenStream ()
	Open a file for input. More...
Public Member Functions inherited from Nektar::NekMeshUtils::Module
NEKMESHUTILS_EXPORT	Module (MeshSharedPtr p_m)
NEKMESHUTILS_EXPORT void	RegisterConfig (std::string key, std::string value=std::string())
	Register a configuration option with a module. More...
NEKMESHUTILS_EXPORT void	PrintConfig ()
	Print out all configuration options for a module. More...
NEKMESHUTILS_EXPORT void	SetDefaults ()
	Sets default configuration options for those which have not been set. More...
NEKMESHUTILS_EXPORT MeshSharedPtr	GetMesh ()
virtual NEKMESHUTILS_EXPORT void	ProcessVertices ()
	Extract element vertices. More...
virtual NEKMESHUTILS_EXPORT void	ProcessEdges (bool ReprocessEdges=true)
	Extract element edges. More...
virtual NEKMESHUTILS_EXPORT void	ProcessFaces (bool ReprocessFaces=true)
	Extract element faces. More...
virtual NEKMESHUTILS_EXPORT void	ProcessElements ()
	Generate element IDs. More...
virtual NEKMESHUTILS_EXPORT void	ProcessComposites ()
	Generate composites. More...
virtual NEKMESHUTILS_EXPORT void	ClearElementLinks ()

Static Public Member Functions
static std::shared_ptr< Module >	create (NekMeshUtils::MeshSharedPtr m)
	Creates an instance of this class. More...

Static Public Attributes
static NekMeshUtils::ModuleKey	className

Additional Inherited Members
Protected Member Functions inherited from Nektar::NekMeshUtils::InputModule
NEKMESHUTILS_EXPORT void	PrintSummary ()
	Print summary of elements. More...
Protected Member Functions inherited from Nektar::NekMeshUtils::Module
NEKMESHUTILS_EXPORT void	ReorderPrisms (PerMap &perFaces)
	Reorder node IDs so that prisms and tetrahedra are aligned correctly. More...
NEKMESHUTILS_EXPORT void	PrismLines (int prism, PerMap &perFaces, std::set< int > &prismsDone, std::vector< ElementSharedPtr > &line)
Protected Attributes inherited from Nektar::NekMeshUtils::InputModule
io::filtering_istream	m_mshFile
	Input stream. More...
std::ifstream	m_mshFileStream
	Input stream. More...
Protected Attributes inherited from Nektar::NekMeshUtils::Module
MeshSharedPtr	m_mesh
	Mesh object. More...
std::map< std::string, ConfigOption >	m_config
	List of configuration values. More...

Detailed Description

Converter for Swansea mesh format.

Definition at line 46 of file InputSwan.h.

Constructor & Destructor Documentation

InputSwan()

Nektar::Utilities::InputSwan::InputSwan

(

NekMeshUtils::MeshSharedPtr

m

)

Definition at line 51 of file InputSwan.cpp.

                                    : InputModule(m)
{
}

~InputSwan()

Nektar::Utilities::InputSwan::~InputSwan ( )

virtual

Definition at line 55 of file InputSwan.cpp.

{
}

Member Function Documentation

create()

static std::shared_ptr<Module> Nektar::Utilities::InputSwan::create ( NekMeshUtils::MeshSharedPtr  m )

inlinestatic

Creates an instance of this class.

Definition at line 50 of file InputSwan.h.

References Nektar::MemoryManager< DataType >::AllocateSharedPtr().

    {
        return MemoryManager<InputSwan>::AllocateSharedPtr(m);
    }

Process()

void Nektar::Utilities::InputSwan::Process ( )

virtual

Populate and validate required data structures.

Implements Nektar::NekMeshUtils::Module.

Definition at line 59 of file InputSwan.cpp.

References Nektar::LibUtilities::NekFactory< tKey, tBase, tParam >::CreateInstance(), Nektar::LibUtilities::eTetrahedron, Nektar::LibUtilities::eTriangle, Nektar::NekMeshUtils::GetElementFactory(), Nektar::NekMeshUtils::Module::m_mesh, Nektar::NekMeshUtils::InputModule::m_mshFile, class_topology::Node, Nektar::NekMeshUtils::InputModule::OpenStream(), Nektar::NekMeshUtils::Module::ProcessComposites(), Nektar::NekMeshUtils::Module::ProcessEdges(), Nektar::NekMeshUtils::Module::ProcessElements(), Nektar::NekMeshUtils::Module::ProcessFaces(), and Nektar::NekMeshUtils::Module::ProcessVertices().

{
    // Open the file stream.
    OpenStream();

    vector<vector<NodeSharedPtr> > elementList;
    vector<int> tmp, tets;
    vector<double> pts;

    if (m_mesh->m_verbose)
    {
        cout << "InputSwan: Start reading file..." << endl;
    }

    m_mesh->m_expDim   = 3;
    m_mesh->m_spaceDim = 3;

    // First read in header; 4 integers containing number of tets,
    // number of points, nas2 (unknown) and order of the grid
    // (i.e. GridOrder = 3 => cubic mesh).
    tmp.resize(6);
    m_mshFile.read(reinterpret_cast<char *>(&tmp[0]),
                   static_cast<int>(6 * sizeof(int)));

    if (tmp[0] != tmp[5] || tmp[0] != 4 * sizeof(int))
    {
        cout << "Header data broken" << endl;
        m_mshFile.reset();
        return;
    }

    int NB_Tet    = tmp[1];
    int NB_Points = tmp[2];
    int GridOrder = tmp[4];
    int ND        = (GridOrder + 1) * (GridOrder + 2) * (GridOrder + 3) / 6;

    cout << "NB_Tet    = " << NB_Tet << endl;
    cout << "NB_Points = " << NB_Points << endl;
    cout << "GridOrder = " << GridOrder << endl;
    cout << "ND        = " << ND << endl;

    // Now read in list of tetrahedra. Each tet has ND points, and
    // data are ordered with memory traversed fastest with point
    // number.
    tets.resize(ND * NB_Tet + 2);
    m_mshFile.read(reinterpret_cast<char *>(&tets[0]),
                   static_cast<int>((ND * NB_Tet + 2) * sizeof(int)));

    if (tets[0] != tets[ND * NB_Tet + 1] ||
        tets[0] != ND * NB_Tet * sizeof(int))
    {
        cout << "ERROR [InputSwan]: Tetrahedron data broken." << endl;
        m_mshFile.reset();
        return;
    }

    // Finally, read point data: NB_Points tuples (x,y,z).
    tmp.resize(2);
    pts.resize(3 * NB_Points);
    m_mshFile.read(reinterpret_cast<char *>(&tmp[0]),
                   static_cast<int>(sizeof(int)));
    m_mshFile.read(reinterpret_cast<char *>(&pts[0]),
                   static_cast<int>(3 * NB_Points * sizeof(double)));
    m_mshFile.read(reinterpret_cast<char *>(&tmp[1]),
                   static_cast<int>(sizeof(int)));

    if (tmp[0] != tmp[1] || tmp[0] != 3 * NB_Points * sizeof(double))
    {
        cout << "ERROR [InputSwan]: Point data broken." << endl;
        m_mshFile.reset();
        return;
    }

    int vid                        = 0, i, j;
    LibUtilities::ShapeType elType = LibUtilities::eTetrahedron;

    // Read in list of vertices.
    for (i = 0; i < NB_Points; ++i)
    {
        double x = pts[i];
        double y = pts[1 * NB_Points + i];
        double z = pts[2 * NB_Points + i];
        m_mesh->m_node.push_back(
            std::shared_ptr<Node>(new Node(vid, x, y, z)));
        vid++;
    }

    // Iterate over list of tetrahedra: for each, create nodes. At the
    // moment discard high order data and create linear mesh.
    for (i = 0; i < NB_Tet; ++i)
    {
        vector<NodeSharedPtr> nodeList;
        for (j = 0; j < 20; ++j)
        {
            int vid = tets[j * NB_Tet + i + 1];
            nodeList.push_back(m_mesh->m_node[vid - 1]);
        }

        vector<int> tags;
        tags.push_back(0);      // composite
        tags.push_back(elType); // element type

        ElmtConfig conf(elType, 3, true, true);
        ElementSharedPtr E =
            GetElementFactory().CreateInstance(elType, conf, nodeList, tags);
        m_mesh->m_element[3].push_back(E);
    }

    // Attempt to read in composites. Need to determine number of
    // triangles from data.
    tmp.resize(2);
    m_mshFile.read(reinterpret_cast<char *>(&tmp[0]),
                   static_cast<int>(sizeof(int)));
    int n_tri = tmp[0] / sizeof(int) / 5;
    tets.resize(n_tri * 5);
    m_mshFile.read(reinterpret_cast<char *>(&tets[0]),
                   static_cast<int>(tmp[0]));
    m_mshFile.read(reinterpret_cast<char *>(&tmp[1]),
                   static_cast<int>(sizeof(int)));

    if (tmp[0] != tmp[1])
    {
        cout << "ERROR [InputSwan]: Surface data broken." << endl;
        m_mshFile.reset();
        return;
    }

    elType = LibUtilities::eTriangle;

    // Process list of triangles forming surfaces.
    for (i = 0; i < n_tri; ++i)
    {
        vector<NodeSharedPtr> nodeList;

        for (j = 0; j < 3; ++j)
        {
            nodeList.push_back(m_mesh->m_node[tets[i + j * n_tri] - 1]);
        }

        vector<int> tags;
        tags.push_back(1);      // composite
        tags.push_back(elType); // element type

        ElmtConfig conf(elType, 1, false, false);
        ElementSharedPtr E =
            GetElementFactory().CreateInstance(elType, conf, nodeList, tags);
        m_mesh->m_element[2].push_back(E);
    }

    m_mshFile.reset();

    // Process the rest of the mesh.
    ProcessVertices();
    ProcessEdges();
    ProcessFaces();
    ProcessElements();
    ProcessComposites();
}

Member Data Documentation

className

ModuleKey Nektar::Utilities::InputSwan::className

static

Initial value:

= GetModuleFactory().RegisterCreatorFunction(
    ModuleKey(eInputModule, "plt"),
    InputSwan::create,
    "Reads Swansea plt format for third-order tetrahedra.")

Definition at line 54 of file InputSwan.h.