# Office

VTKExamples/Cxx/VisualizationAlgorithms/Office

### Description

Using random point seeds to create streamlines.

This example demonstrates the use of * vtkPointSource** to generate streamlines. The dataset is a structured grid representation of a CFD simulation of flow in a small office with flow velocity and a scalar pressure field. As this picture shows, there are a couple of bookcases, desks, a window, and an inlet and outlet for the ventilation system. On one of the desks is a small, intense heat source (e.g., a cigarette).

We generate 25 streamlines that are started near the inlet using a * vtkPointSource** point generator. By adjusting a single parameter (e.g., the center of the point source) it is possible to quickly explore our simulation data.

This program provides you with an optional parameter to select from one of several point source centers. The figure was created using:

    ./Office office.vtl 3

Info

See Figure 9-47 in Chapter 9 in the VTK Textbook.

Other Languages

See (Python)

### Code

Office.cxx

    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkNamedColors.h>
    #include <vtkPointData.h>
    #include <vtkPointSource.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkStreamTracer.h>
    #include <vtkStructuredGrid.h>
    #include <vtkStructuredGridGeometryFilter.h>
    #include <vtkStructuredGridOutlineFilter.h>
    #include <vtkStructuredGridReader.h>

    #include <array>
    #include <vector>

    int main(int argc, char* argv[])
    {
      if (argc < 2)
      {
        std::cout << "Usage: " << argv[0] << " filename [center]" << std::endl;
        std::cout
          << "Demonstrate the use of vtkPointSource to generate streamlines."
          << std::endl;
        std::cout << "Where: " << std::endl;
        std::cout << "       filename: office.binary.vtk" << std::endl;
        std::cout << "       center: An optional parameter choosing the center for "
                     "the seeds."
                  << std::endl;
        std::cout
          << "               0 - Corresponds to Fig 9-47(a) in the VTK textbook."
          << std::endl;
        std::cout << "               1 - A slight shift to the left." << std::endl;
        std::cout << "               2 - A slight shift to the upper left. (from "
                     "the Original code)."
                  << std::endl;
        std::cout
          << "               3 - The default, a slight shift to the upper left."
          << std::endl;
        std::cout << "                   Roughly corresponds to Fig 9-47(b) in the "
                     "VTK textbook."
                  << std::endl;
        return EXIT_FAILURE;
      }

      auto center = 3;
      if (argc > 2)
      {
        center = std::abs(atoi(argv[2]));
      }
      // These are the centers for the streamline seed.
      std::vector<std::array<double, 3>> seedCenters{
        {0.0, 2.1, 0.5}, {0.1, 2.1, 0.5}, {0.1, 2.7, 0.5}, {0.08, 2.7, 0.5}};
      center = (center < static_cast<int>(seedCenters.size()))
                 ? center
                 : static_cast<int>(seedCenters.size()) - 1;

      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();
      std::array<double, 3> tableTopColor = {0.59, 0.427, 0.392};
      std::array<double, 3> filingCabinetColor = {0.8, 0.8, 0.6};
      std::array<double, 3> bookShelfColor = {0.8, 0.8, 0.6};
      std::array<double, 3> windowColor = {0.3, 0.3, 0.5};
      colors->SetColor("TableTop", tableTopColor.data());
      colors->SetColor("FilingCabinet", filingCabinetColor.data());
      colors->SetColor("BookShelf", bookShelfColor.data());
      colors->SetColor("Window", windowColor.data());

      // We read a data file that represents a CFD analysis of airflow in an office
      // (with ventilation and a burning cigarette).
      vtkSmartPointer<vtkStructuredGridReader> reader =
        vtkSmartPointer<vtkStructuredGridReader>::New();
      reader->SetFileName(argv[1]);

      // Create the scene.
      // We generate a whole bunch of planes which correspond to
      // the geometry in the analysis; tables, bookshelves and so on.
      vtkSmartPointer<vtkStructuredGridGeometryFilter> table1 =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      table1->SetInputConnection(reader->GetOutputPort());
      table1->SetExtent(11, 15, 7, 9, 8, 8);
      vtkSmartPointer<vtkPolyDataMapper> mapTable1 =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapTable1->SetInputConnection(table1->GetOutputPort());
      mapTable1->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> table1Actor = vtkSmartPointer<vtkActor>::New();
      table1Actor->SetMapper(mapTable1);
      table1Actor->GetProperty()->SetColor(
        colors->GetColor3d("TableTop").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> table2 =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      table2->SetInputConnection(reader->GetOutputPort());
      table2->SetExtent(11, 15, 10, 12, 8, 8);
      vtkSmartPointer<vtkPolyDataMapper> mapTable2 =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapTable2->SetInputConnection(table2->GetOutputPort());
      mapTable2->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> table2Actor = vtkSmartPointer<vtkActor>::New();
      table2Actor->SetMapper(mapTable2);
      table2Actor->GetProperty()->SetColor(
        colors->GetColor3d("TableTop").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> FilingCabinet1 =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      FilingCabinet1->SetInputConnection(reader->GetOutputPort());
      FilingCabinet1->SetExtent(15, 15, 7, 9, 0, 8);
      vtkSmartPointer<vtkPolyDataMapper> mapFilingCabinet1 =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapFilingCabinet1->SetInputConnection(FilingCabinet1->GetOutputPort());
      mapFilingCabinet1->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> FilingCabinet1Actor =
        vtkSmartPointer<vtkActor>::New();
      FilingCabinet1Actor->SetMapper(mapFilingCabinet1);
      FilingCabinet1Actor->GetProperty()->SetColor(
        colors->GetColor3d("FilingCabinet").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> FilingCabinet2 =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      FilingCabinet2->SetInputConnection(reader->GetOutputPort());
      FilingCabinet2->SetExtent(15, 15, 10, 12, 0, 8);
      vtkSmartPointer<vtkPolyDataMapper> mapFilingCabinet2 =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapFilingCabinet2->SetInputConnection(FilingCabinet2->GetOutputPort());
      mapFilingCabinet2->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> FilingCabinet2Actor =
        vtkSmartPointer<vtkActor>::New();
      FilingCabinet2Actor->SetMapper(mapFilingCabinet2);
      FilingCabinet2Actor->GetProperty()->SetColor(
        colors->GetColor3d("FilingCabinet").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf1Top =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf1Top->SetInputConnection(reader->GetOutputPort());
      bookshelf1Top->SetExtent(13, 13, 0, 4, 0, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf1Top =
        vtkSmartPointer<vtkPolyDataMapper>::New();

      mapBookshelf1Top->SetInputConnection(bookshelf1Top->GetOutputPort());
      mapBookshelf1Top->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf1TopActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf1TopActor->SetMapper(mapBookshelf1Top);
      bookshelf1TopActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf1Bottom =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf1Bottom->SetInputConnection(reader->GetOutputPort());
      bookshelf1Bottom->SetExtent(20, 20, 0, 4, 0, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf1Bottom =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf1Bottom->SetInputConnection(bookshelf1Bottom->GetOutputPort());
      mapBookshelf1Bottom->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf1BottomActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf1BottomActor->SetMapper(mapBookshelf1Bottom);
      bookshelf1BottomActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf1Front =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf1Front->SetInputConnection(reader->GetOutputPort());
      bookshelf1Front->SetExtent(13, 20, 0, 0, 0, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf1Front =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf1Front->SetInputConnection(bookshelf1Front->GetOutputPort());
      mapBookshelf1Front->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf1FrontActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf1FrontActor->SetMapper(mapBookshelf1Front);
      bookshelf1FrontActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf1Back =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf1Back->SetInputConnection(reader->GetOutputPort());
      bookshelf1Back->SetExtent(13, 20, 4, 4, 0, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf1Back =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf1Back->SetInputConnection(bookshelf1Back->GetOutputPort());
      mapBookshelf1Back->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf1BackActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf1BackActor->SetMapper(mapBookshelf1Back);
      bookshelf1BackActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf1LHS =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf1LHS->SetInputConnection(reader->GetOutputPort());
      bookshelf1LHS->SetExtent(13, 20, 0, 4, 0, 0);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf1LHS =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf1LHS->SetInputConnection(bookshelf1LHS->GetOutputPort());
      mapBookshelf1LHS->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf1LHSActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf1LHSActor->SetMapper(mapBookshelf1LHS);
      bookshelf1LHSActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf1RHS =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf1RHS->SetInputConnection(reader->GetOutputPort());
      bookshelf1RHS->SetExtent(13, 20, 0, 4, 11, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf1RHS =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf1RHS->SetInputConnection(bookshelf1RHS->GetOutputPort());
      mapBookshelf1RHS->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf1RHSActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf1RHSActor->SetMapper(mapBookshelf1RHS);
      bookshelf1RHSActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf2Top =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf2Top->SetInputConnection(reader->GetOutputPort());
      bookshelf2Top->SetExtent(13, 13, 15, 19, 0, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf2Top =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf2Top->SetInputConnection(bookshelf2Top->GetOutputPort());
      mapBookshelf2Top->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf2TopActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf2TopActor->SetMapper(mapBookshelf2Top);
      bookshelf2TopActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf2Bottom =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf2Bottom->SetInputConnection(reader->GetOutputPort());
      bookshelf2Bottom->SetExtent(20, 20, 15, 19, 0, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf2Bottom =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf2Bottom->SetInputConnection(bookshelf2Bottom->GetOutputPort());
      mapBookshelf2Bottom->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf2BottomActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf2BottomActor->SetMapper(mapBookshelf2Bottom);
      bookshelf2BottomActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf2Front =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf2Front->SetInputConnection(reader->GetOutputPort());
      bookshelf2Front->SetExtent(13, 20, 15, 15, 0, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf2Front =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf2Front->SetInputConnection(bookshelf2Front->GetOutputPort());
      mapBookshelf2Front->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf2FrontActor =
        vtkSmartPointer<vtkActor>::New();

      bookshelf2FrontActor->SetMapper(mapBookshelf2Front);
      bookshelf2FrontActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf2Back =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf2Back->SetInputConnection(reader->GetOutputPort());
      bookshelf2Back->SetExtent(13, 20, 19, 19, 0, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf2Back =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf2Back->SetInputConnection(bookshelf2Back->GetOutputPort());
      mapBookshelf2Back->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf2BackActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf2BackActor->SetMapper(mapBookshelf2Back);
      bookshelf2BackActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf2LHS =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();

      bookshelf2LHS->SetInputConnection(reader->GetOutputPort());
      bookshelf2LHS->SetExtent(13, 20, 15, 19, 0, 0);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf2LHS =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf2LHS->SetInputConnection(bookshelf2LHS->GetOutputPort());
      mapBookshelf2LHS->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf2LHSActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf2LHSActor->SetMapper(mapBookshelf2LHS);
      bookshelf2LHSActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> bookshelf2RHS =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      bookshelf2RHS->SetInputConnection(reader->GetOutputPort());
      bookshelf2RHS->SetExtent(13, 20, 15, 19, 11, 11);
      vtkSmartPointer<vtkPolyDataMapper> mapBookshelf2RHS =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapBookshelf2RHS->SetInputConnection(bookshelf2RHS->GetOutputPort());
      mapBookshelf2RHS->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> bookshelf2RHSActor =
        vtkSmartPointer<vtkActor>::New();
      bookshelf2RHSActor->SetMapper(mapBookshelf2RHS);
      bookshelf2RHSActor->GetProperty()->SetColor(
        colors->GetColor3d("BookShelf").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> window =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      window->SetInputConnection(reader->GetOutputPort());
      window->SetExtent(20, 20, 6, 13, 10, 13);
      vtkSmartPointer<vtkPolyDataMapper> mapWindow =
        vtkSmartPointer<vtkPolyDataMapper>::New();

      mapWindow->SetInputConnection(window->GetOutputPort());
      mapWindow->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> windowActor = vtkSmartPointer<vtkActor>::New();
      windowActor->SetMapper(mapWindow);
      windowActor->GetProperty()->SetColor(colors->GetColor3d("Window").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> outlet =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      outlet->SetInputConnection(reader->GetOutputPort());
      outlet->SetExtent(0, 0, 9, 10, 14, 16);
      vtkSmartPointer<vtkPolyDataMapper> mapOutlet =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapOutlet->SetInputConnection(outlet->GetOutputPort());
      mapOutlet->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> outletActor = vtkSmartPointer<vtkActor>::New();
      outletActor->SetMapper(mapOutlet);
      outletActor->GetProperty()->SetColor(
        colors->GetColor3d("lamp_black").GetData());

      vtkSmartPointer<vtkStructuredGridGeometryFilter> inlet =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      inlet->SetInputConnection(reader->GetOutputPort());
      inlet->SetExtent(0, 0, 9, 10, 0, 6);
      vtkSmartPointer<vtkPolyDataMapper> mapInlet =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapInlet->SetInputConnection(inlet->GetOutputPort());
      mapInlet->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> inletActor = vtkSmartPointer<vtkActor>::New();
      inletActor->SetMapper(mapInlet);
      inletActor->GetProperty()->SetColor(
        colors->GetColor3d("lamp_black").GetData());

      vtkSmartPointer<vtkStructuredGridOutlineFilter> outline =
        vtkSmartPointer<vtkStructuredGridOutlineFilter>::New();
      outline->SetInputConnection(reader->GetOutputPort());
      vtkSmartPointer<vtkPolyDataMapper> mapOutline =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapOutline->SetInputConnection(outline->GetOutputPort());
      vtkSmartPointer<vtkActor> outlineActor = vtkSmartPointer<vtkActor>::New();
      outlineActor->SetMapper(mapOutline);
      outlineActor->GetProperty()->SetColor(colors->GetColor3d("Black").GetData());

      // Create the source for the streamtubes.
      vtkSmartPointer<vtkPointSource> seeds =
        vtkSmartPointer<vtkPointSource>::New();
      seeds->SetRadius(0.075);
      seeds->SetCenter(seedCenters[center].data());
      seeds->SetNumberOfPoints(25);
      vtkSmartPointer<vtkStreamTracer> streamers =
        vtkSmartPointer<vtkStreamTracer>::New();
      streamers->SetInputConnection(reader->GetOutputPort());
      streamers->SetSourceConnection(seeds->GetOutputPort());
      streamers->SetMaximumPropagation(500);
      streamers->SetMinimumIntegrationStep(0.1);
      streamers->SetMaximumIntegrationStep(1.0);
      streamers->SetInitialIntegrationStep(0.2);
      streamers->Update();
      vtkSmartPointer<vtkPolyDataMapper> mapStreamers =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapStreamers->SetInputConnection(streamers->GetOutputPort());
      mapStreamers->SetScalarRange(
        reader->GetOutput()->GetPointData()->GetScalars()->GetRange());
      vtkSmartPointer<vtkActor> streamersActor = vtkSmartPointer<vtkActor>::New();
      streamersActor->SetMapper(mapStreamers);

      // Now create the usual graphics stuff.
      vtkSmartPointer<vtkRenderer> ren = vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renWin =
        vtkSmartPointer<vtkRenderWindow>::New();
      renWin->AddRenderer(ren);
      vtkSmartPointer<vtkRenderWindowInteractor> iren =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      iren->SetRenderWindow(renWin);

      ren->AddActor(table1Actor);
      ren->AddActor(table2Actor);
      ren->AddActor(FilingCabinet1Actor);
      ren->AddActor(FilingCabinet2Actor);
      ren->AddActor(bookshelf1TopActor);
      ren->AddActor(bookshelf1BottomActor);
      ren->AddActor(bookshelf1FrontActor);
      ren->AddActor(bookshelf1BackActor);
      ren->AddActor(bookshelf1LHSActor);
      ren->AddActor(bookshelf1RHSActor);
      ren->AddActor(bookshelf2TopActor);
      ren->AddActor(bookshelf2BottomActor);
      ren->AddActor(bookshelf2FrontActor);
      ren->AddActor(bookshelf2BackActor);
      ren->AddActor(bookshelf2LHSActor);
      ren->AddActor(bookshelf2RHSActor);
      ren->AddActor(windowActor);
      ren->AddActor(outletActor);
      ren->AddActor(inletActor);
      ren->AddActor(outlineActor);
      ren->AddActor(streamersActor);

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

      // Here we specify a particular view.
      vtkSmartPointer<vtkCamera> aCamera = vtkSmartPointer<vtkCamera>::New();
      aCamera->SetClippingRange(0.726079, 36.3039);
      aCamera->SetFocalPoint(2.43584, 2.15046, 1.11104);
      aCamera->SetPosition(-4.76183, -10.4426, 3.17203);
      aCamera->SetViewUp(0.0511273, 0.132773, 0.989827);
      aCamera->SetViewAngle(18.604);
      aCamera->Zoom(1.2);

      ren->SetActiveCamera(aCamera);

      renWin->SetSize(640, 400);
      iren->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(Office)

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

### Download and Build Office

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

    cd Office/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:

    ./Office

WINDOWS USERS

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