# BlobbyLogo

VTKExamples/Cxx/Visualization/BlobbyLogo

### Description

This is the blobby vtk logo described in chapter 12 of the VTK textbook.

This examples uses the data v.vtk, t.vtk and k.vtk.

### Code

BlobbyLogo.cxx

    //
    // use implicit modeller to create the VTK logo
    //

    #include <vtkSmartPointer.h>

    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkPolyDataReader.h>
    #include <vtkTransform.h>
    #include <vtkTransformPolyDataFilter.h>
    #include <vtkAppendPolyData.h>
    #include <vtkPolyDataNormals.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkImplicitModeller.h>
    #include <vtkContourFilter.h>
    #include <vtkProperty.h>

    #include <vtkNamedColors.h>

    int main( int argc, char *argv[] )
    {
      if (argc < 4)
      {
        std::cout << "Usage: " << argv[0] << " v.vtk t.vtk k.vtk" << std::endl;
        return EXIT_FAILURE;
      }

      vtkSmartPointer<vtkRenderer> aRenderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> aRenderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      aRenderWindow->AddRenderer(aRenderer);
      vtkSmartPointer<vtkRenderWindowInteractor> anInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      anInteractor->SetRenderWindow(aRenderWindow);
      aRenderWindow->SetSize( 300, 300 );

      // read the geometry file containing the letter v
      vtkSmartPointer<vtkPolyDataReader> letterV =
        vtkSmartPointer<vtkPolyDataReader>::New();
      letterV->SetFileName (argv[1]);

      // read the geometry file containing the letter t
      vtkSmartPointer<vtkPolyDataReader> letterT =
        vtkSmartPointer<vtkPolyDataReader>::New();
      letterT->SetFileName (argv[2]);

      // read the geometry file containing the letter k
      vtkSmartPointer<vtkPolyDataReader> letterK =
        vtkSmartPointer<vtkPolyDataReader>::New();
      letterK->SetFileName (argv[3]);

      // create a transform and transform filter for each letter
      vtkSmartPointer<vtkTransform> VTransform =
        vtkSmartPointer<vtkTransform>::New();
      vtkSmartPointer<vtkTransformPolyDataFilter> VTransformFilter =
        vtkSmartPointer<vtkTransformPolyDataFilter>::New();
      VTransformFilter->SetInputConnection(letterV->GetOutputPort());
      VTransformFilter->SetTransform (VTransform);

      vtkSmartPointer<vtkTransform> TTransform =
        vtkSmartPointer<vtkTransform>::New();
      vtkSmartPointer<vtkTransformPolyDataFilter> TTransformFilter =
        vtkSmartPointer<vtkTransformPolyDataFilter>::New();
      TTransformFilter->SetInputConnection (letterT->GetOutputPort());
      TTransformFilter->SetTransform (TTransform);

      vtkSmartPointer<vtkTransform> KTransform =
        vtkSmartPointer<vtkTransform>::New();
      vtkSmartPointer<vtkTransformPolyDataFilter> KTransformFilter =
        vtkSmartPointer<vtkTransformPolyDataFilter>::New();
      KTransformFilter->SetInputConnection(letterK->GetOutputPort());
      KTransformFilter->SetTransform (KTransform);

      // now append them all
      vtkSmartPointer<vtkAppendPolyData> appendAll =
        vtkSmartPointer<vtkAppendPolyData>::New();
      appendAll->AddInputConnection (VTransformFilter->GetOutputPort());
      appendAll->AddInputConnection (TTransformFilter->GetOutputPort());
      appendAll->AddInputConnection (KTransformFilter->GetOutputPort());

      // create normals
      vtkSmartPointer<vtkPolyDataNormals> logoNormals =
        vtkSmartPointer<vtkPolyDataNormals>::New();
      logoNormals->SetInputConnection (appendAll->GetOutputPort());
      logoNormals->SetFeatureAngle (60);

      // map to rendering primitives
      vtkSmartPointer<vtkPolyDataMapper> logoMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      logoMapper->SetInputConnection (logoNormals->GetOutputPort());

      // now an actor
      vtkSmartPointer<vtkActor> logo =
        vtkSmartPointer<vtkActor>::New();
      logo->SetMapper (logoMapper);

      // now create an implicit model of the same letter
      vtkSmartPointer<vtkImplicitModeller> blobbyLogoImp =
        vtkSmartPointer<vtkImplicitModeller>::New();
      blobbyLogoImp->SetInputConnection(appendAll->GetOutputPort());
      blobbyLogoImp->SetMaximumDistance (.075);
      blobbyLogoImp->SetSampleDimensions (64,64,64);
      blobbyLogoImp->SetAdjustDistance (0.05);

      // extract an iso surface
      vtkSmartPointer<vtkContourFilter> blobbyLogoIso =
        vtkSmartPointer<vtkContourFilter>::New();
      blobbyLogoIso->SetInputConnection (blobbyLogoImp->GetOutputPort());
      blobbyLogoIso->SetValue (1, 1.5);

      // map to rendering primitives
      vtkSmartPointer<vtkPolyDataMapper> blobbyLogoMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      blobbyLogoMapper->SetInputConnection (blobbyLogoIso->GetOutputPort());
      blobbyLogoMapper->ScalarVisibilityOff ();

      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

      vtkSmartPointer<vtkProperty> tomato =
        vtkSmartPointer<vtkProperty>::New();
      tomato->SetDiffuseColor(colors->GetColor3d("tomato").GetData());
      tomato->SetSpecular(.3);
      tomato->SetSpecularPower(20);

      vtkSmartPointer<vtkProperty> banana =
        vtkSmartPointer<vtkProperty>::New();
      banana->SetDiffuseColor(colors->GetColor3d("banana").GetData());
      banana->SetDiffuse (.7);
      banana->SetSpecular(.4);
      banana->SetSpecularPower(20);

      // now an actor
      vtkSmartPointer<vtkActor> blobbyLogo =
        vtkSmartPointer<vtkActor>::New();
      blobbyLogo->SetMapper (blobbyLogoMapper);
      blobbyLogo->SetProperty (banana);

      // position the letters

      VTransform->Translate (-16.0,0.0,12.5);
      VTransform->RotateY (40);

      KTransform->Translate (14.0, 0.0, 0.0);
      KTransform->RotateY (-40);

      // move the polygonal letters to the front
      logo->SetProperty (tomato);
      logo->SetPosition(0,0,6);

      aRenderer->AddActor(logo);
      aRenderer->AddActor(blobbyLogo);

      aRenderer->SetBackground(colors->GetColor3d("SlateGray").GetData());

      aRenderWindow->Render();

      // interact with data
      anInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(BlobbyLogo)

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

    add_executable(BlobbyLogo MACOSX_BUNDLE BlobbyLogo.cxx )

    target_link_libraries(BlobbyLogo ${VTK_LIBRARIES})

### Download and Build BlobbyLogo

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

    cd BlobbyLogo/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:

    ./BlobbyLogo

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.