VTK/Examples/Cxx/RectilinearGrid/RectilinearGridToTetrahedra

RectilinearGridToTetrahedra.cxx

#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkXMLUnstructuredGridWriter.h>
#include <vtkRectilinearGrid.h>
#include <vtkRectilinearGridToTetrahedra.h>
#include <vtkUnstructuredGrid.h>
#include <vtkMath.h>
#include <vtkDoubleArray.h>
 
int main(int, char *[])
{
  // Create a grid
  vtkSmartPointer<vtkRectilinearGrid> grid = 
    vtkSmartPointer<vtkRectilinearGrid>::New();
 
  grid->SetDimensions(5,4,3);
 
  vtkSmartPointer<vtkDoubleArray> xArray = 
    vtkSmartPointer<vtkDoubleArray>::New();
  xArray->InsertNextValue(0.0);
  xArray->InsertNextValue(1.0);
  xArray->InsertNextValue(2.0);
  xArray->InsertNextValue(3.0);
  xArray->InsertNextValue(4.0);

  vtkSmartPointer<vtkDoubleArray> yArray = 
    vtkSmartPointer<vtkDoubleArray>::New();
  yArray->InsertNextValue(0.0);
  yArray->InsertNextValue(1.0);
  yArray->InsertNextValue(2.0);
  yArray->InsertNextValue(3.0);
 
  vtkSmartPointer<vtkDoubleArray> zArray = 
    vtkSmartPointer<vtkDoubleArray>::New();
  zArray->InsertNextValue(0.0);
  zArray->InsertNextValue(1.0);
  zArray->InsertNextValue(2.0);
 
  grid->SetXCoordinates(xArray);
  grid->SetYCoordinates(yArray);
  grid->SetZCoordinates(zArray);
 
  vtkSmartPointer<vtkRectilinearGridToTetrahedra> rectilinearGridToTetrahedra =
    vtkSmartPointer<vtkRectilinearGridToTetrahedra>::New();
#if VTK_MAJOR_VERSION <= 5
  rectilinearGridToTetrahedra->SetInputConnection(grid->GetProducerPort());
#else
  rectilinearGridToTetrahedra->SetInputData(grid);
#endif
  rectilinearGridToTetrahedra->Update();
 
  vtkSmartPointer<vtkXMLUnstructuredGridWriter> writer = 
    vtkSmartPointer<vtkXMLUnstructuredGridWriter>::New();
  writer->SetFileName("output.vtu");
  writer->SetInputConnection(rectilinearGridToTetrahedra->GetOutputPort());
  writer->Write();
 
  std::cout << "There are " 
            << rectilinearGridToTetrahedra->GetOutput()->GetNumberOfCells()
            << " cells." << std::endl;
 
  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(RectilinearGridToTetrahedra)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(RectilinearGridToTetrahedra MACOSX_BUNDLE RectilinearGridToTetrahedra.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(RectilinearGridToTetrahedra ${VTK_LIBRARIES})
else()
  target_link_libraries(RectilinearGridToTetrahedra vtkHybrid vtkWidgets)
endif()

Download and Build RectilinearGridToTetrahedra

Click here to download RectilinearGridToTetrahedra. and its CMakeLists.txt file.

Once the tarball RectilinearGridToTetrahedra.tar has been downloaded and extracted,

cd RectilinearGridToTetrahedra/build 

• If VTK is installed:

cmake ..

• If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./RectilinearGridToTetrahedra

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.