# CameraBlur

VTKExamples/Cxx/Rendering/CameraBlur

### Code

CameraBlur.cxx

    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkConeSource.h>
    #include <vtkGlyph3D.h>
    #include <vtkNamedColors.h>
    #include <vtkNew.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkSphereSource.h>

    #include <algorithm>
    #include <array>

    int main(int, char* [])
    {
      vtkNew<vtkNamedColors> colors;

      // Set the colors.
      auto SetColor = [&colors](std::array<double, 3>& v,
                                std::string const& colorName) {
        auto const scaleFactor = 255.0;
        std::transform(std::begin(v), std::end(v), std::begin(v),
                       [=](double const& n) { return n / scaleFactor; });
        colors->SetColor(colorName, v.data());
        return;
      };
      std::array<double, 3> bkg1{{26, 51, 102}};
      SetColor(bkg1, "Bkg");

      // Create the rendering objects.
      vtkNew<vtkRenderer> ren1;
      vtkNew<vtkRenderWindow> renWin;
      renWin->AddRenderer(ren1);
      vtkNew<vtkRenderWindowInteractor> iren;
      iren->SetRenderWindow(renWin);

      // Create the pipeline, ball and spikes.
      vtkNew<vtkSphereSource> sphere;
      sphere->SetPhiResolution(7);
      sphere->SetThetaResolution(7);
      vtkNew<vtkPolyDataMapper> sphereMapper;
      sphereMapper->SetInputConnection(sphere->GetOutputPort());
      vtkNew<vtkActor> sphereActor;
      sphereActor->SetMapper(sphereMapper);
      vtkNew<vtkActor> sphereActor2;
      sphereActor2->SetMapper(sphereMapper);

      vtkNew<vtkConeSource> cone;
      cone->SetResolution(5);
      vtkNew<vtkGlyph3D> glyph;
      glyph->SetInputConnection(sphere->GetOutputPort());
      glyph->SetSourceConnection(cone->GetOutputPort());
      glyph->SetVectorModeToUseNormal();
      glyph->SetScaleModeToScaleByVector();
      glyph->SetScaleFactor(0.25);
      vtkNew<vtkPolyDataMapper> spikeMapper;
      spikeMapper->SetInputConnection(glyph->GetOutputPort());
      vtkNew<vtkActor> spikeActor;
      spikeActor->SetMapper(spikeMapper);
      vtkNew<vtkActor> spikeActor2;
      spikeActor2->SetMapper(spikeMapper);

      spikeActor->SetPosition(0, 0.7, 0);
      sphereActor->SetPosition(0, 0.7, 0);
      spikeActor2->SetPosition(0, -1.0, -10);
      sphereActor2->SetPosition(0, -1.0, -10);
      spikeActor2->SetScale(1.5, 1.5, 1.5);
      sphereActor2->SetScale(1.5, 1.5, 1.5);

      ren1->AddActor(sphereActor);
      ren1->AddActor(spikeActor);
      ren1->AddActor(sphereActor2);
      ren1->AddActor(spikeActor2);
      ren1->SetBackground(colors->GetColor3d("Bkg").GetData());
      renWin->SetSize(300, 300);
      //   renWin->DoubleBufferOff();

      // Do the first render and then zoom in a little.
      renWin->Render();
      ren1->GetActiveCamera()->SetFocalPoint(0, 0, 0.0);
      ren1->GetActiveCamera()->Zoom(1.8);
      ren1->GetActiveCamera()->SetFocalDisk(0.05);

      renWin->Render();

      iren->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(CameraBlur)

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

    add_executable(CameraBlur MACOSX_BUNDLE CameraBlur.cxx )

    target_link_libraries(CameraBlur ${VTK_LIBRARIES})

### Download and Build CameraBlur

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

    cd CameraBlur/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:

    ./CameraBlur

WINDOWS USERS

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