ReadUnknownTypeXMLFile

VTKEx/Cxx/IO/ReadUnknownTypeXMLFile

Description¶

This examples reads either a vtu (unstructured grid) or vtp (polydata) file and displays it to the screen.

Other languages

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code¶

ReadUnknownTypeXMLFile.cxx

#include <vtkSmartPointer.h>
#include <vtkXMLGenericDataObjectReader.h>

#include <vtkPolyData.h>
#include <vtkUnstructuredGrid.h>
#include <vtkDataSetMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkNamedColors.h>

int main(int argc, char *argv[])
{
  // Ensure a filename was specified
  if(argc < 2)
  {
    std::cout << "Usage: " << argv[0] << " InputFilename" << std::endl;
    return EXIT_FAILURE;
  }

  // Get all data from the file
  vtkSmartPointer<vtkXMLGenericDataObjectReader> reader =
    vtkSmartPointer<vtkXMLGenericDataObjectReader>::New();
  reader->SetFileName(argv[1]);
  reader->Update();

  // All of the standard data types can be checked and obtained like this:
  if(dynamic_cast<vtkPolyData*>(reader->GetOutput()))
  {
    std::cout << "File is a polydata" << std::endl;
  }
  else if(dynamic_cast<vtkUnstructuredGrid*>(reader->GetOutput()))
  {
    std::cout << "File is an unstructured grid" << std::endl;
  }

  // Visualize
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();
  vtkSmartPointer<vtkDataSetMapper> mapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  mapper->SetInputConnection(reader->GetOutputPort());

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("Moccasin").GetData());

  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(colors->GetColor3d("SlateGray").GetData());

  renderWindow->SetSize(640, 480);
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ReadUnknownTypeXMLFile)

find_package(VTK COMPONENTS 
  vtkvtkCommonColor
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkIOXML
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping ReadUnknownTypeXMLFile: ${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(ReadUnknownTypeXMLFile MACOSX_BUNDLE ReadUnknownTypeXMLFile.cxx )
  target_link_libraries(ReadUnknownTypeXMLFile PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ReadUnknownTypeXMLFile MACOSX_BUNDLE ReadUnknownTypeXMLFile.cxx )
  target_link_libraries(ReadUnknownTypeXMLFile PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ReadUnknownTypeXMLFile
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build ReadUnknownTypeXMLFile¶

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

cd ReadUnknownTypeXMLFile/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:

./ReadUnknownTypeXMLFile

WINDOWS USERS

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