# TexturedSphere

VTKExamples/Cxx/Texture/TexturedSphere

### Code

TexturedSphere.cxx

    #include <vtkSmartPointer.h>

    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkActor.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkTransformTextureCoords.h>
    #include <vtkTexture.h>
    #include <vtkTextureMapToSphere.h>
    #include <vtkImageReader2Factory.h>
    #include <vtkImageReader.h>
    #include <vtkTexturedSphereSource.h>

    int main (int argc, char *argv[])
    {
      if (argc < 2)
      {
          std::cout << "Usage: " << argv[0]
                    << " texture(.png)"
                    << " [translate]" <<std::endl;
          return EXIT_FAILURE;
      }
      double translate[3];
      if (argc > 2)
      {
          translate[0] = atof(argv[2]);
      }
      else
      {
          translate[0] = 0.0;
      }
      translate[1] = 0.0;
      translate[2] = 0.0;
      std::cout << translate[0] << ", "
                << translate[1] << ", "
                << translate[2] << "\n";
      // Create a sphere with texture coordinates
      vtkSmartPointer<vtkTexturedSphereSource> source =
        vtkSmartPointer<vtkTexturedSphereSource>::New();

      // Read texture file
      vtkSmartPointer<vtkImageReader2Factory> readerFactory =
        vtkSmartPointer<vtkImageReader2Factory>::New();
      vtkSmartPointer<vtkImageReader2> imageReader =
        readerFactory->CreateImageReader2(argv[1]);
      imageReader->SetFileName(argv[1]);

      // Create texture
      vtkSmartPointer<vtkTexture> texture =
        vtkSmartPointer<vtkTexture>::New();
      texture->SetInputConnection(imageReader->GetOutputPort());

      vtkSmartPointer<vtkTransformTextureCoords> transformTexture =
        vtkSmartPointer<vtkTransformTextureCoords>::New();
      transformTexture->SetInputConnection(source->GetOutputPort());
      transformTexture->SetPosition(translate);

      vtkSmartPointer<vtkPolyDataMapper> mapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(transformTexture->GetOutputPort());

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

      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      renderer->AddActor(actor);
      renderer->SetBackground(.1, .2, .3);

      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer( renderer );

      vtkSmartPointer<vtkRenderWindowInteractor> renWinInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renWinInteractor->SetRenderWindow( renderWindow );

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

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(TexturedSphere)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkFiltersSources
      vtkFiltersTexture
      vtkIOImage
      vtkInteractionStyle
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping TexturedSphere: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(TexturedSphere MACOSX_BUNDLE TexturedSphere.cxx )
      target_link_libraries(TexturedSphere PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(TexturedSphere MACOSX_BUNDLE TexturedSphere.cxx )
      target_link_libraries(TexturedSphere PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS TexturedSphere
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build TexturedSphere

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

    cd TexturedSphere/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:

    ./TexturedSphere

WINDOWS USERS

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