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# DataSetSurface

VTKEx/Cxx/VisualizationAlgorithms/DataSetSurface

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Question

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### Code

DataSetSurface.cxx

    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkCellArray.h>
    #include <vtkCutter.h>
    #include <vtkDataSetMapper.h>
    #include <vtkDataSetSurfaceFilter.h>
    #include <vtkHexahedron.h>
    #include <vtkNamedColors.h>
    #include <vtkPlane.h>
    #include <vtkPoints.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkSmartPointer.h>
    #include <vtkUnstructuredGrid.h>

    #include <array>
    #include <cstdlib>

    int main(int, char* [])
    {
      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

      // Setup the coordinates of eight points
      // (the two faces must be in counter clockwise order as viewed from the
      // outside)
      std::array<std::array<double, 3>, 8> pointCoords{{
        {{0.0, 0.0, 0.0}},
        {{1.0, 0.0, 0.0}},
        {{1.0, 1.0, 0.0}},
        {{0.0, 1.0, 0.0}},
        {{0.0, 0.0, 1.0}},
        {{1.0, 0.0, 1.0}},
        {{1.0, 1.0, 1.0}},
        {{0.0, 1.0, 1.0}}}};

      // Create the points and a hexahedron from the points.
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      vtkSmartPointer<vtkHexahedron> hexa =
        vtkSmartPointer<vtkHexahedron>::New();
      for (auto i = 0; i < pointCoords.size(); ++i)
      {
        points->InsertNextPoint(pointCoords[i].data());
        hexa->GetPointIds()->SetId(i, i);
      }

      // Add the hexahedron to a cell array.
      vtkSmartPointer<vtkCellArray> hexs =
        vtkSmartPointer<vtkCellArray>::New();
      hexs->InsertNextCell(hexa);

      // Add the points and hexahedron to an unstructured grid.
      vtkSmartPointer<vtkUnstructuredGrid> uGrid =
        vtkSmartPointer<vtkUnstructuredGrid>::New();
      uGrid->SetPoints(points);
      uGrid->InsertNextCell(hexa->GetCellType(), hexa->GetPointIds());

      // Extract the outer (polygonal) surface.
      vtkSmartPointer<vtkDataSetSurfaceFilter> surface =
        vtkSmartPointer<vtkDataSetSurfaceFilter>::New();
      surface->SetInputData(uGrid);
      surface->Update();

      vtkSmartPointer<vtkDataSetMapper> aBeamMapper =
        vtkSmartPointer<vtkDataSetMapper>::New();
      aBeamMapper->SetInputConnection(surface->GetOutputPort());
      vtkSmartPointer<vtkActor> aBeamActor =
        vtkSmartPointer<vtkActor>::New();
      aBeamActor->SetMapper(aBeamMapper);
      aBeamActor->AddPosition(0, 0, 0);
      aBeamActor->GetProperty()->SetColor(
        colors->GetColor3d("Yellow").GetData());
      aBeamActor->GetProperty()->SetOpacity(0.60);
      aBeamActor->GetProperty()->EdgeVisibilityOn();
      aBeamActor->GetProperty()->SetEdgeColor(
        colors->GetColor3d("Black").GetData());
      aBeamActor->GetProperty()->SetLineWidth(1.5);

      // Create a plane to cut, here it cuts in the XZ direction
      // (xz normal=(1,0,0); XY =(0,0,1), YZ =(0,1,0)
      vtkSmartPointer<vtkPlane> plane =
        vtkSmartPointer<vtkPlane>::New();
      plane->SetOrigin(0.5, 0, 0);
      plane->SetNormal(1, 0, 0);

      // Create cutter
      vtkSmartPointer<vtkCutter> cutter =
        vtkSmartPointer<vtkCutter>::New();
      cutter->SetCutFunction(plane);
      cutter->SetInputData(aBeamActor->GetMapper()->GetInput());
      cutter->Update();
      vtkSmartPointer<vtkPolyDataMapper> cutterMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      cutterMapper->SetInputConnection(cutter->GetOutputPort());

      // Create plane actor
      vtkSmartPointer<vtkActor> planeActor =
        vtkSmartPointer<vtkActor>::New();
      planeActor->GetProperty()->SetColor(
        colors->GetColor3d("Red").GetData());
      planeActor->GetProperty()->SetLineWidth(2);
      planeActor->SetMapper(cutterMapper);

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

      // Add the actors to the scene
      renderer->AddActor(aBeamActor);
      renderer->AddActor(planeActor);
      renderer->SetBackground(
        colors->GetColor3d("Seashell").GetData());

      renderer->ResetCamera();
      renderer->GetActiveCamera()->Azimuth(-25);
      renderer->GetActiveCamera()->Elevation(30);

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

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(DataSetSurface)

    find_package(VTK COMPONENTS
      vtkCommonColor
      vtkCommonCore
      vtkCommonDataModel
      vtkFiltersCore
      vtkFiltersGeometry
      vtkInteractionStyle
      vtkRenderingContextOpenGL2
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingGL2PSOpenGL2
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping DataSetSurface: ${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(DataSetSurface MACOSX_BUNDLE DataSetSurface.cxx )
      target_link_libraries(DataSetSurface PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(DataSetSurface MACOSX_BUNDLE DataSetSurface.cxx )
      target_link_libraries(DataSetSurface PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS DataSetSurface
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build DataSetSurface

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

    cd DataSetSurface/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:

    ./DataSetSurface

WINDOWS USERS

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