# DataSetSurfaceFilter

VTKExamples/Cxx/PolyData/DataSetSurfaceFilter

### Description

This example demonstrates how to convert an unstructured grid to a polydata. Currently nothing is done with the resulting polydata. If someone has a good data set that demonstrates the conversion, please let us know.

### Code

DataSetSurfaceFilter.cxx

    #include <vtkVersion.h>
    #include <vtkSmartPointer.h>
    #include <vtkPolyData.h>
    #include <vtkUnstructuredGrid.h>
    #include <vtkCellArray.h>
    #include <vtkDataSetSurfaceFilter.h>
    #include <vtkPointSource.h>

    int main(int, char *[])
    {

      vtkSmartPointer<vtkUnstructuredGrid> unstructuredGrid =
        vtkSmartPointer<vtkUnstructuredGrid>::New();

      vtkSmartPointer<vtkDataSetSurfaceFilter> surfaceFilter =
        vtkSmartPointer<vtkDataSetSurfaceFilter>::New();
    #if VTK_MAJOR_VERSION <= 5
      surfaceFilter->SetInput(unstructuredGrid);
    #else
      surfaceFilter->SetInputData(unstructuredGrid);
    #endif
      surfaceFilter->Update();

      vtkPolyData* polydata = surfaceFilter->GetOutput();

      std::cout << "Output has " << polydata->GetNumberOfPoints() << " points." << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(DataSetSurfaceFilter)

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

    add_executable(DataSetSurfaceFilter MACOSX_BUNDLE DataSetSurfaceFilter.cxx )

    target_link_libraries(DataSetSurfaceFilter ${VTK_LIBRARIES})

### Download and Build DataSetSurfaceFilter

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

    cd DataSetSurfaceFilter/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:

    ./DataSetSurfaceFilter

WINDOWS USERS

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