# ShrinkCube

VTKExamples/Cxx/GeometricObjects/ShrinkCube

### Description

Generates a cube using vtkCubeSource, then a shrink filter is applied.

Seealso

TessellatedBoxSource generates multiple quads or triangles per side.

Info

See Figure 5-17 in Chapter 5 the VTK Textbook.

Other Languages

See (Python), (Java)

### Code

ShrinkCube.cxx

    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkCubeSource.h>
    #include <vtkDataSetMapper.h>
    #include <vtkNamedColors.h>
    #include <vtkPolyData.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkShrinkFilter.h>
    #include <vtkSmartPointer.h>

    int main(int, char *[])
    {
      // Create a cube.
      vtkSmartPointer<vtkCubeSource> cubeSource =
        vtkSmartPointer<vtkCubeSource>::New();

      vtkSmartPointer<vtkShrinkFilter> shrink =
        vtkSmartPointer<vtkShrinkFilter>::New();
      shrink->SetInputConnection(cubeSource->GetOutputPort());
      shrink->SetShrinkFactor(.9);

      // Create a mapper and actor.
      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

      vtkSmartPointer<vtkDataSetMapper> mapper =
        vtkSmartPointer<vtkDataSetMapper>::New();
      mapper->SetInputConnection(shrink->GetOutputPort());

      vtkSmartPointer<vtkProperty> back =
        vtkSmartPointer<vtkProperty>::New();
      back->SetColor(colors->GetColor3d("Tomato").GetData());

      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);
      actor->GetProperty()->EdgeVisibilityOn();
      actor->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
      actor->SetBackfaceProperty(back);

      // Create a renderer, render window, and interactor
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      // Add the actors to the scene
      renderer->AddActor(actor);
      renderer->SetBackground(colors->GetColor3d("Silver").GetData());

      renderer->ResetCamera();
      renderer->GetActiveCamera()->Azimuth(30);
      renderer->GetActiveCamera()->Elevation(30);
      renderer->ResetCameraClippingRange();

      // Render and interact
      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ShrinkCube)

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

    add_executable(ShrinkCube MACOSX_BUNDLE ShrinkCube.cxx )

    target_link_libraries(ShrinkCube ${VTK_LIBRARIES})

### Download and Build ShrinkCube

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

    cd ShrinkCube/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:

    ./ShrinkCube

WINDOWS USERS

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