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ReadUnknownTypeXMLFile

vtk-examples/Cxx/IO/ReadUnknownTypeXMLFile

Description

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

Other languages

See (CSharp)

Question

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

Code

ReadUnknownTypeXMLFile.cxx

#include <vtkActor.h>
#include <vtkDataSetMapper.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkUnstructuredGrid.h>
#include <vtkXMLGenericDataObjectReader.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
  vtkNew<vtkXMLGenericDataObjectReader> reader;
  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
  vtkNew<vtkNamedColors> colors;
  vtkNew<vtkDataSetMapper> mapper;
  mapper->SetInputConnection(reader->GetOutputPort());

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("Moccasin").GetData());

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

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  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 3.12 FATAL_ERROR)

project(ReadUnknownTypeXMLFile)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "ReadUnknownTypeXMLFile: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
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}
)

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.