# WindowedSincPolyDataFilter

VTKExamples/Cxx/Meshes/WindowedSincPolyDataFilter

### Description

This example demonstrates how to smooth a mesh.

### Code

WindowedSincPolyDataFilter.cxx

    #include <vtkSmartPointer.h>
    #include <vtkPolyData.h>
    #include <vtkSphereSource.h>
    #include <vtkWindowedSincPolyDataFilter.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkRenderer.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();

      vtkSmartPointer<vtkWindowedSincPolyDataFilter> smoother =
        vtkSmartPointer<vtkWindowedSincPolyDataFilter>::New();
      smoother->SetInputConnection(sphereSource->GetOutputPort());
      smoother->SetNumberOfIterations(15);
      smoother->BoundarySmoothingOff();
      smoother->FeatureEdgeSmoothingOff();
      smoother->SetFeatureAngle(120.0);
      smoother->SetPassBand(.001);
      smoother->NonManifoldSmoothingOn();
      smoother->NormalizeCoordinatesOn();
      smoother->Update();

      vtkSmartPointer<vtkPolyDataMapper> smoothedMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      smoothedMapper->SetInputConnection(smoother->GetOutputPort());
      vtkSmartPointer<vtkActor> smoothedActor =
        vtkSmartPointer<vtkActor>::New();
      smoothedActor->SetMapper(smoothedMapper);

      vtkSmartPointer<vtkPolyDataMapper> inputMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      inputMapper->SetInputConnection(sphereSource->GetOutputPort());
      vtkSmartPointer<vtkActor> inputActor =
        vtkSmartPointer<vtkActor>::New();
      inputActor->SetMapper(inputMapper);

      // There will be one render window
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->SetSize(600, 300);

      // And one interactor
      vtkSmartPointer<vtkRenderWindowInteractor> interactor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      interactor->SetRenderWindow(renderWindow);

      // Define viewport ranges
      // (xmin, ymin, xmax, ymax)
      double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
      double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};

      // Setup both renderers
      vtkSmartPointer<vtkRenderer> leftRenderer =
        vtkSmartPointer<vtkRenderer>::New();
      renderWindow->AddRenderer(leftRenderer);
      leftRenderer->SetViewport(leftViewport);
      leftRenderer->SetBackground(.6, .5, .4);

      vtkSmartPointer<vtkRenderer> rightRenderer =
        vtkSmartPointer<vtkRenderer>::New();
      renderWindow->AddRenderer(rightRenderer);
      rightRenderer->SetViewport(rightViewport);
      rightRenderer->SetBackground(.4, .5, .6);

      // Add the sphere to the left and the cube to the right
      leftRenderer->AddActor(inputActor);
      rightRenderer->AddActor(smoothedActor);

      leftRenderer->ResetCamera();

      rightRenderer->ResetCamera();

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

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(WindowedSincPolyDataFilter)

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

    add_executable(WindowedSincPolyDataFilter MACOSX_BUNDLE WindowedSincPolyDataFilter.cxx)

    target_link_libraries(WindowedSincPolyDataFilter ${VTK_LIBRARIES})

### Download and Build WindowedSincPolyDataFilter

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

    cd WindowedSincPolyDataFilter/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:

    ./WindowedSincPolyDataFilter

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.