# PolyDataFilter

VTKExamples/Cxx/Developers/PolyDataFilter

### Description

This example demonstrates a filter named vtkTestPolyDataFilter that takes a vtkPolyData as input and produces a vtkPolyData as output.

### Code

PolyDataFilter.cxx

    #include <vtkSmartPointer.h>

    #include "vtkTestPolyDataFilter.h"

    int main(int, char *[])
    {
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      points->InsertNextPoint(0.0, 0.0, 0.0);

      vtkSmartPointer<vtkPolyData> inputPolydata =
        vtkSmartPointer<vtkPolyData>::New();
      inputPolydata->SetPoints(points);

      std::cout << "Input points: " << inputPolydata->GetNumberOfPoints()
                << std::endl;

      vtkSmartPointer<vtkTestPolyDataFilter> filter =
        vtkSmartPointer<vtkTestPolyDataFilter>::New();
    #if VTK_MAJOR_VERSION <= 5
      filter->SetInput(inputPolydata);
    #else
      filter->SetInputData(inputPolydata);
    #endif
      filter->Update();

      vtkPolyData* outputPolydata = filter->GetOutput();

      std::cout << "Output points: " << outputPolydata->GetNumberOfPoints()
                << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(PolyDataFilter)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(PolyDataFilter MACOSX_BUNDLE PolyDataFilter.cxx)

    target_link_libraries(PolyDataFilter ${VTK_LIBRARIES})

### Download and Build PolyDataFilter

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

    cd PolyDataFilter/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:

    ./PolyDataFilter

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