# ScalarVisibility

VTKExamples/Cxx/Visualization/ScalarVisibility

### Code

ScalarVisibility.cxx

    #include <vtkActor.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkPointSource.h>
    #include <vtkProperty.h>
    #include <vtkPolyData.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkSmartPointer.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkPointSource> pointSource = vtkSmartPointer<vtkPointSource>::New();
      vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(pointSource->GetOutputPort());
      mapper->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
      actor->SetMapper( mapper );
      unsigned char red[3] = {255, 0, 0};
      actor->GetProperty()->SetColor(red[0], red[1], red[2]);
      vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
      renderer->AddActor(actor);

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

      renderWindow->Render();

      interactor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(ScalarVisibility)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel
      vtkFiltersSources
      vtkInteractionStyle
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping ScalarVisibility: ${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(ScalarVisibility MACOSX_BUNDLE ScalarVisibility.cxx )
      target_link_libraries(ScalarVisibility PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(ScalarVisibility MACOSX_BUNDLE ScalarVisibility.cxx )
      target_link_libraries(ScalarVisibility PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS ScalarVisibility
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build ScalarVisibility

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

    cd ScalarVisibility/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:

    ./ScalarVisibility

WINDOWS USERS

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