# GaussianSplat

VTKExamples/Cxx/Filtering/GaussianSplat

### Code

GaussianSplat.cxx

    #include <vtkVersion.h>
    #include <vtkSmartPointer.h>
    #include <vtkPolyData.h>
    #include <vtkXMLPolyDataWriter.h>
    #include <vtkContourFilter.h>
    #include <vtkGaussianSplatter.h>
    #include <vtkSphereSource.h>

    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>

    int main(int, char *[])
    {
      // Create points on a sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();

      vtkSmartPointer<vtkPolyData> polydata =
        vtkSmartPointer<vtkPolyData>::New();
      polydata->SetPoints(sphereSource->GetOutput()->GetPoints());

      vtkSmartPointer<vtkGaussianSplatter> splatter =
        vtkSmartPointer<vtkGaussianSplatter>::New();
    #if VTK_MAJOR_VERSION <= 5
      splatter->SetInput(polydata);
    #else
      splatter->SetInputData(polydata);
    #endif
      splatter->SetSampleDimensions(50,50,50);
      splatter->SetRadius(0.5);
      splatter->ScalarWarpingOff();

      vtkSmartPointer<vtkContourFilter> surface =
        vtkSmartPointer<vtkContourFilter>::New();
      surface->SetInputConnection(splatter->GetOutputPort());
      surface->SetValue(0,0.01);

      // Create a mapper and actor
      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(surface->GetOutputPort());

      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);

      // Visualize
      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(1,1,1); // Background color white

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

      return EXIT_SUCCESS;

    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(GaussianSplat)

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

    add_executable(GaussianSplat MACOSX_BUNDLE GaussianSplat.cxx)

    target_link_libraries(GaussianSplat ${VTK_LIBRARIES})

### Download and Build GaussianSplat

Danger

The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.

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

    cd GaussianSplat/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:

    ./GaussianSplat

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.