# RectilinearGrid

VTKExamples/Cxx/RectilinearGrid/RectilinearGrid

Other Languages

See (Python)

### Code

RectilinearGrid.cxx

    #include <vtkSmartPointer.h>
    #include <vtkRectilinearGrid.h>
    #include <vtkMath.h>
    #include <vtkDoubleArray.h>
    #include <vtkDataSetMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>

    int main(int, char *[])
    {
      // Create a grid
      vtkSmartPointer<vtkRectilinearGrid> grid =
        vtkSmartPointer<vtkRectilinearGrid>::New();

      grid->SetDimensions(2,3,1);

      vtkSmartPointer<vtkDoubleArray> xArray =
        vtkSmartPointer<vtkDoubleArray>::New();
      xArray->InsertNextValue(0.0);
      xArray->InsertNextValue(2.0);

      vtkSmartPointer<vtkDoubleArray> yArray =
        vtkSmartPointer<vtkDoubleArray>::New();
      yArray->InsertNextValue(0.0);
      yArray->InsertNextValue(1.0);
      yArray->InsertNextValue(2.0);

      vtkSmartPointer<vtkDoubleArray> zArray =
        vtkSmartPointer<vtkDoubleArray>::New();
      zArray->InsertNextValue(0.0);

      grid->SetXCoordinates(xArray);
      grid->SetYCoordinates(yArray);
      grid->SetZCoordinates(zArray);

      std::cout << "There are " << grid->GetNumberOfPoints()
                << " points." << std::endl;
      std::cout << "There are " << grid->GetNumberOfCells()
                << " cells." << std::endl;

      for(vtkIdType id = 0; id < grid->GetNumberOfPoints(); id++)
      {
        double p[3];
        grid->GetPoint(id, p);
        std::cout << "Point " << id
                  << " : (" << p[0] << " , " << p[1] << " , " << p[2] << ")" << std::endl;
      }

      // Create a mapper and actor
      vtkSmartPointer<vtkDataSetMapper> mapper =
        vtkSmartPointer<vtkDataSetMapper>::New();
      mapper->SetInputData(grid);

      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);

      // Visualize
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      renderer->AddActor(actor);
      renderer->SetBackground(.3, .6, .3); // Background color green

      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(RectilinearGrid)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel
      vtkInteractionStyle
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping RectilinearGrid: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(RectilinearGrid MACOSX_BUNDLE RectilinearGrid.cxx )
      target_link_libraries(RectilinearGrid PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(RectilinearGrid MACOSX_BUNDLE RectilinearGrid.cxx )
      target_link_libraries(RectilinearGrid PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS RectilinearGrid
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build RectilinearGrid

Click here to download RectilinearGrid and its CMakeLists.txt file. Once the tarball RectilinearGrid.tar has been downloaded and extracted,

    cd RectilinearGrid/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:

    ./RectilinearGrid

WINDOWS USERS

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