Nektar::Utilities::InputVtk Class Reference

Converter for VTK files. More...

#include <InputVtk.h>

Inheritance diagram for Nektar::Utilities::InputVtk:

Collaboration diagram for Nektar::Utilities::InputVtk:

Public Member Functions
	InputVtk (MeshSharedPtr m)
virtual	~InputVtk ()
virtual void	Process ()
	Populate and validate required data structures.
Public Member Functions inherited from Nektar::Utilities::InputModule
	InputModule (FieldSharedPtr p_m)
void	AddFile (string fileType, string fileName)
	InputModule (MeshSharedPtr p_m)
void	OpenStream ()
	Open a file for input.
Public Member Functions inherited from Nektar::Utilities::Module
	Module (FieldSharedPtr p_f)
virtual void	Process (po::variables_map &vm)=0
void	RegisterConfig (string key, string value)
	Register a configuration option with a module.
void	PrintConfig ()
	Print out all configuration options for a module.
void	SetDefaults ()
	Sets default configuration options for those which have not been set.
bool	GetRequireEquiSpaced (void)
void	SetRequireEquiSpaced (bool pVal)
	Module (MeshSharedPtr p_m)
void	RegisterConfig (string key, string value)
void	PrintConfig ()
void	SetDefaults ()
MeshSharedPtr	GetMesh ()
virtual void	ProcessVertices ()
	Extract element vertices.

Static Public Member Functions
static ModuleSharedPtr	create (MeshSharedPtr m)
	Creates an instance of this class.

Static Public Attributes
static ModuleKey	className

Additional Inherited Members
Protected Member Functions inherited from Nektar::Utilities::InputModule
void	PrintSummary ()
	Print summary of elements.
void	PrintSummary ()
	Print summary of elements.
Protected Attributes inherited from Nektar::Utilities::InputModule
set< string >	m_allowedFiles
std::ifstream	m_mshFile
	Input stream.

Detailed Description

Converter for VTK files.

Definition at line 46 of file InputVtk.h.

Constructor & Destructor Documentation

Nektar::Utilities::InputVtk::InputVtk

(

MeshSharedPtr

m

)

Definition at line 58 of file InputVtk.cpp.

                                          : InputModule(m)
        {

        }

Nektar::Utilities::InputVtk::~InputVtk ( )

virtual

Definition at line 63 of file InputVtk.cpp.

        {

        }

Member Function Documentation

static ModuleSharedPtr Nektar::Utilities::InputVtk::create ( MeshSharedPtr  m )

inlinestatic

Creates an instance of this class.

Definition at line 50 of file InputVtk.h.

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

void Nektar::Utilities::InputVtk::Process ( )

virtual

Populate and validate required data structures.

Gmsh file contains a list of nodes and their coordinates, along with a list of elements and those nodes which define them. We read in and store the list of nodes in #m_node and store the list of elements in #m_element. Each new element is supplied with a list of entries from #m_node which defines the element. Finally some mesh statistics are printed.

Parameters

pFilename

Filename of Gmsh file to read.

Implements Nektar::Utilities::Module.

Definition at line 79 of file InputVtk.cpp.

References Nektar::LibUtilities::eSegment, Nektar::LibUtilities::eTriangle, Nektar::Utilities::GetElementFactory(), Nektar::Utilities::Module::m_config, Nektar::Utilities::Module::m_mesh, npts, Nektar::Utilities::Module::ProcessComposites(), Nektar::Utilities::Module::ProcessEdges(), Nektar::Utilities::Module::ProcessElements(), Nektar::Utilities::Module::ProcessFaces(), and Nektar::Utilities::Module::ProcessVertices().

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

            vtkPolyDataReader *vtkMeshReader = vtkPolyDataReader::New();
            vtkMeshReader->SetFileName(m_config["infile"].as<string>().c_str());
            vtkMeshReader->Update();
            vtkPolyData *vtkMesh = vtkMeshReader->GetOutput();

            vtkPoints *vtkPoints = vtkMesh->GetPoints();

            const int numCellTypes = 3;
            vtkCellArray* vtkCells[numCellTypes];
            LibUtilities::ShapeType vtkCellTypes[numCellTypes];
            int vtkNumPoints[numCellTypes];
            vtkCells[0] = vtkMesh->GetPolys();
            vtkCells[1] = vtkMesh->GetStrips();
            vtkCells[2] = vtkMesh->GetLines();
            vtkCellTypes[0] = LibUtilities::eTriangle;
            vtkCellTypes[1] = LibUtilities::eTriangle;
            vtkCellTypes[2] = LibUtilities::eSegment;
            vtkNumPoints[0] = 3;
            vtkNumPoints[1] = 3;
            vtkNumPoints[2] = 2;

            vtkIdType npts;
            vtkIdType *pts = 0;
            double p[3];

            for (int i = 0; i < vtkPoints->GetNumberOfPoints(); ++i)
            {
                vtkPoints->GetPoint(i, p);

                if ((p[0] * p[0]) > 0.000001 && m_mesh->m_spaceDim < 1)
                {
                    m_mesh->m_spaceDim = 1;
                }
                if ((p[1] * p[1]) > 0.000001 && m_mesh->m_spaceDim < 2)
                {
                    m_mesh->m_spaceDim = 2;
                }
                if ((p[2] * p[2]) > 0.000001 && m_mesh->m_spaceDim < 3)
                {
                    m_mesh->m_spaceDim = 3;
                }

                m_mesh->m_node.push_back(boost::shared_ptr<Node>(new Node(i, p[0], p[1], p[2])));
            }

            for (int c = 0; c < numCellTypes; ++c)
            {
                vtkCells[c]->InitTraversal();
                for (int i = 0; vtkCells[c]->GetNextCell(npts, pts); ++i)
                {
                    for (int j = 0; j < npts - vtkNumPoints[c] + 1; ++j)
                    {
                        // Create element tags
                        vector<int> tags;
                        tags.push_back(0); // composite
                        tags.push_back(vtkCellTypes[c]); // element type

                        // Read element node list
                        vector<NodeSharedPtr> nodeList;
                        for (int k = j; k < j + vtkNumPoints[c]; ++k)
                        {
                            nodeList.push_back(m_mesh->m_node[pts[k]]);
                        }

                        // Create element
                        ElmtConfig conf(vtkCellTypes[c],1,false,false);
                        ElementSharedPtr E = GetElementFactory().
                            CreateInstance(vtkCellTypes[c],
                                            conf,nodeList,tags);

                        // Determine mesh expansion dimension
                        if (E->GetDim() > m_mesh->m_expDim) {
                            m_mesh->m_expDim = E->GetDim();
                        }
                        m_mesh->m_element[E->GetDim()].push_back(E);
                    }
                }
            }

            ProcessVertices();
            ProcessEdges();
            ProcessFaces();
            ProcessElements();
            ProcessComposites();
        }

Member Data Documentation

ModuleKey Nektar::Utilities::InputVtk::className

static

Initial value:

            GetModuleFactory().RegisterCreatorFunction(
                ModuleKey(eInputModule, "vtk"), InputVtk::create,
                "Reads VTK format.")

Definition at line 53 of file InputVtk.h.