ReadRectilinearGrid

VTKExamples/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 simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

ReadRectilinearGrid.cxx

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

int main(int argc, char* argv[])
{
  // 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
  vtkSmartPointer<vtkXMLRectilinearGridReader> reader =
    vtkSmartPointer<vtkXMLRectilinearGridReader>::New();
  reader->SetFileName(inputFilename.c_str());
  reader->Update();
/*
  vtkSmartPointer<vtkRectilinearGridGeometryFilter> geometryFilter =
    vtkSmartPointer<vtkRectilinearGridGeometryFilter>::New();
  geometryFilter->SetInputConnection(reader->GetOutputPort());
  geometryFilter->Update();
*/
  // Visualize
  vtkSmartPointer<vtkDataSetMapper> mapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  //mapper->SetInputConnection(geometryFilter->GetOutputPort());
  mapper->SetInputConnection(reader->GetOutputPort());

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

  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(ReadRectilinearGrid)

find_package(VTK COMPONENTS 
  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.