# Rotations

VTKExamples/Cxx/Rendering/Rotations

### Code

Rotations.cxx

    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkAxes.h>
    #include <vtkProperty.h>
    #include <vtkCamera.h>

    #include <vtkBYUReader.h>
    #include <vtkOBJReader.h>
    #include <vtkPLYReader.h>
    #include <vtkPolyDataReader.h>
    #include <vtkSTLReader.h>
    #include <vtkXMLPolyDataReader.h>
    #include <vtkSphereSource.h>
    #include <vtksys/SystemTools.hxx>

    #include <vtkNamedColors.h>

    namespace
    {
    vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName);
    void  RotateX (vtkSmartPointer<vtkRenderWindow> &renWin,
                   vtkSmartPointer<vtkActor> &actor);
    void  RotateY (vtkSmartPointer<vtkRenderWindow> &renWin,
                   vtkSmartPointer<vtkActor> &actor);
    void  RotateZ (vtkSmartPointer<vtkRenderWindow> &renWin,
                   vtkSmartPointer<vtkActor> &actor);
    void  RotateXY (vtkSmartPointer<vtkRenderWindow> &renWin,
                    vtkSmartPointer<vtkActor> &actor);
    }
    int main (int argc, char *argv[])
    {
    // Create renderer stuff
    //
      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

      vtkSmartPointer<vtkRenderer> ren1 =
        vtkSmartPointer<vtkRenderer>::New();

      vtkSmartPointer<vtkRenderWindow> renWin =
        vtkSmartPointer<vtkRenderWindow>::New();
      renWin->AddRenderer(ren1);

      vtkSmartPointer<vtkRenderWindowInteractor> iren =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      iren->SetRenderWindow(renWin);

    // create pipeline
    //
      vtkSmartPointer<vtkPolyData> polyData = ReadPolyData(argc > 1 ? argv[1] : "");;

      vtkSmartPointer<vtkPolyDataMapper> modelMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      modelMapper->SetInputData(polyData);

      vtkSmartPointer<vtkActor> modelActor =
        vtkSmartPointer<vtkActor>::New();
      modelActor->SetMapper(modelMapper);
      modelActor->GetProperty()->SetDiffuseColor(0.9608, 0.8706, 0.7020);
      modelActor->GetProperty()->SetDiffuseColor(colors->GetColor3d("Crimson").GetData());
      modelActor->GetProperty()->SetSpecular(.6);
      modelActor->GetProperty()->SetSpecularPower(30);

      vtkSmartPointer<vtkAxes> modelAxesSource =
        vtkSmartPointer<vtkAxes>::New();
      modelAxesSource->SetScaleFactor(10);
      modelAxesSource->SetOrigin(0, 0, 0);

      vtkSmartPointer<vtkPolyDataMapper> modelAxesMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      modelAxesMapper->SetInputConnection(modelAxesSource->GetOutputPort());

      vtkSmartPointer<vtkActor> modelAxes =
        vtkSmartPointer<vtkActor>::New();
      modelAxes->SetMapper(modelAxesMapper);

      ren1->AddActor(modelAxes);
      modelAxes->VisibilityOff();

    // Add the actors to the renderer, set the background and size
    //
      ren1->AddActor(modelActor);
      ren1->SetBackground(colors->GetColor3d("Silver").GetData());
      renWin->SetSize(640, 480);
      ren1->ResetCamera();
      ren1->GetActiveCamera()->Azimuth(0);
      ren1->GetActiveCamera()->SetClippingRange(.1, 1000.0);

      modelAxes->VisibilityOn();

      renWin->Render();
      renWin->Render();

      iren->Start();
      RotateX(renWin, modelActor);
      iren->Start();
      RotateY(renWin, modelActor);
      iren->Start();
      RotateZ(renWin, modelActor);
      iren->Start();
      RotateXY(renWin, modelActor);

      renWin->EraseOff();
      iren->Start();

      return EXIT_SUCCESS;
    }

    namespace
    {
    //
    void  RotateX (vtkSmartPointer<vtkRenderWindow> &renWin,
                   vtkSmartPointer<vtkActor> &actor)
    {
      actor->SetOrientation(0, 0, 0);
      renWin->Render();
      renWin->Render();
      renWin->EraseOff();

      for (int i = 0; i < 6; ++i)
      {
        actor->RotateX(60);
        renWin->Render();
        renWin->Render();
      }
      renWin->EraseOn();
    }
    void  RotateY (vtkSmartPointer<vtkRenderWindow> &renWin,
                   vtkSmartPointer<vtkActor> &actor)
    {
      actor->SetOrientation(0, 0, 0);
      renWin->Render();
      renWin->EraseOff();

      for (int i = 0; i < 6; ++i)
      {
        actor->RotateY(60);
        renWin->Render();
        renWin->Render();
      }
      renWin->EraseOn();
    }
    void  RotateZ (vtkSmartPointer<vtkRenderWindow> &renWin,
                   vtkSmartPointer<vtkActor> &actor)
    {
      actor->SetOrientation(0, 0, 0);
      renWin->Render();
      renWin->EraseOff();

      for (int i = 0; i < 6; ++i)
      {
        actor->RotateZ(60);
        renWin->Render();
        renWin->Render();
      }
      renWin->EraseOn();
    }
    void  RotateXY (vtkSmartPointer<vtkRenderWindow> &renWin,
                   vtkSmartPointer<vtkActor> &actor)
    {
      actor->SetOrientation(0, 0, 0);
      actor->RotateX(60);
      renWin->Render();
      renWin->Render();
      renWin->EraseOff();

      for (int i = 0; i < 6; ++i)
      {
        actor->RotateY(60);
        renWin->Render();
        renWin->Render();
      }
      renWin->EraseOn();
    }
    vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName)
    {
      vtkSmartPointer<vtkPolyData> polyData;
      std::string extension = vtksys::SystemTools::GetFilenameExtension(std::string(fileName));
      if (extension == ".ply")
      {
        vtkSmartPointer<vtkPLYReader> reader =
          vtkSmartPointer<vtkPLYReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".vtp")
      {
        vtkSmartPointer<vtkXMLPolyDataReader> reader =
          vtkSmartPointer<vtkXMLPolyDataReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".obj")
      {
        vtkSmartPointer<vtkOBJReader> reader =
          vtkSmartPointer<vtkOBJReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".stl")
      {
        vtkSmartPointer<vtkSTLReader> reader =
          vtkSmartPointer<vtkSTLReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".vtk")
      {
        vtkSmartPointer<vtkPolyDataReader> reader =
          vtkSmartPointer<vtkPolyDataReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".g")
      {
        vtkSmartPointer<vtkBYUReader> reader =
          vtkSmartPointer<vtkBYUReader>::New();
        reader->SetGeometryFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else
      {
        vtkSmartPointer<vtkSphereSource> source =
          vtkSmartPointer<vtkSphereSource>::New();
        source->Update();
        polyData = source->GetOutput();
      }
      return polyData;
    }
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(Rotations)

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

    add_executable(Rotations MACOSX_BUNDLE Rotations.cxx )

    target_link_libraries(Rotations ${VTK_LIBRARIES})

### Download and Build Rotations

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

    cd Rotations/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:

    ./Rotations

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.