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ReadRectilinearGrid

vtk-examples/Cxx/IO/ReadRectilinearGrid


Description

This example reads a rectilinear grid (.vtr) file. An example file can be found at VTKData/Data/cth.vtr.

Other languages

See (Java), (CSharp)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

ReadRectilinearGrid.cxx

#include <vtkDataSetMapper.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkProperty.h>
#include <vtkRectilinearGridGeometryFilter.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkXMLRectilinearGridReader.h>

int main(int argc, char* argv[])
{
  vtkNew<vtkNamedColors> colors;

  // Verify input arguments
  if (argc < 2)
  {
    std::cout << "Usage: " << argv[0]
              << " Filename.vtr e.g. RectilinearGrid.vtr" << std::endl;
    return EXIT_FAILURE;
  }

  // Parse arguments
  std::string inputFilename = argv[1];

  // Read the file
  vtkNew<vtkXMLRectilinearGridReader> reader;
  reader->SetFileName(inputFilename.c_str());
  reader->Update();

  // vtkNew<vtkRectilinearGridGeometryFilter> geometryFilter;
  // geometryFilter->SetInputConnection(reader->GetOutputPort());
  // geometryFilter->Update();

  // Visualize
  vtkNew<vtkDataSetMapper> mapper;
  // mapper->SetInputConnection(geometryFilter->GetOutputPort());
  mapper->SetInputConnection(reader->GetOutputPort());

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetRepresentationToWireframe();

  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("ReadRectilinearGrid");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("LightSteelBlue").GetData());

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ReadRectilinearGrid)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkFiltersGeometry
  vtkIOXML
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping ReadRectilinearGrid: ${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(ReadRectilinearGrid MACOSX_BUNDLE ReadRectilinearGrid.cxx )
  target_link_libraries(ReadRectilinearGrid PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ReadRectilinearGrid MACOSX_BUNDLE ReadRectilinearGrid.cxx )
  target_link_libraries(ReadRectilinearGrid PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ReadRectilinearGrid
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build ReadRectilinearGrid

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

cd ReadRectilinearGrid/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:

./ReadRectilinearGrid

WINDOWS USERS

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