# CutStructuredGrid

VTKExamples/Cxx/VisualizationAlgorithms/CutStructuredGrid

### Code

CutStructuredGrid.cxx

    #include <vtkCutter.h>
    #include <vtkStructuredGrid.h>
    #include <vtkStructuredGridGeometryFilter.h>
    #include <vtkStructuredGridOutlineFilter.h>

    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkDataSetMapper.h>
    #include <vtkMultiBlockDataSet.h>
    #include <vtkMultiBlockPLOT3DReader.h>
    #include <vtkNamedColors.h>
    #include <vtkPlane.h>
    #include <vtkPointData.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>

    int main(int argc, char *argv[])
    {
      if (argc < 3)
      {
        std::cout << "Usage: " << argv[0] << " combxyz.bin combq.bin" << std::endl;
        return EXIT_FAILURE;
      }

    // Create the RenderWindow, Renderer and both Actors
    //
      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);

    // cut data
      vtkSmartPointer<vtkMultiBlockPLOT3DReader> pl3d =
        vtkSmartPointer<vtkMultiBlockPLOT3DReader>::New();
      pl3d->SetXYZFileName(argv[1]);
      pl3d->SetQFileName(argv[2]);
      pl3d->SetScalarFunctionNumber(100);
      pl3d->SetVectorFunctionNumber(202);
      pl3d->Update();

      vtkStructuredGrid *sg =
        vtkStructuredGrid::SafeDownCast(pl3d->GetOutput()->GetBlock(0));

      vtkSmartPointer<vtkPlane> plane =
        vtkSmartPointer<vtkPlane>::New();
      plane->SetOrigin(sg->GetCenter());
      plane->SetNormal(-0.287, 0, 0.9579);

      vtkSmartPointer<vtkCutter> planeCut =
        vtkSmartPointer<vtkCutter>::New();
      planeCut->SetInputData(pl3d->GetOutput()->GetBlock(0));
      planeCut->SetCutFunction(plane);

      vtkSmartPointer<vtkDataSetMapper> cutMapper =
        vtkSmartPointer<vtkDataSetMapper>::New();
      cutMapper->SetInputConnection(planeCut->GetOutputPort());
      cutMapper->SetScalarRange(sg->GetPointData()->GetScalars()->GetRange());

      vtkSmartPointer<vtkActor> cutActor =
        vtkSmartPointer<vtkActor>::New();
      cutActor->SetMapper(cutMapper);

    //extract plane
      vtkSmartPointer<vtkStructuredGridGeometryFilter> compPlane =
        vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
      compPlane->SetInputData(sg);
      compPlane->SetExtent(0, 100, 0, 100, 9, 9);

      vtkSmartPointer<vtkPolyDataMapper> planeMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      planeMapper->SetInputConnection(compPlane->GetOutputPort());
      planeMapper->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> planeActor =
        vtkSmartPointer<vtkActor>::New();
      planeActor->SetMapper(planeMapper);
      planeActor->GetProperty()->SetRepresentationToWireframe();
      planeActor->GetProperty()->SetColor(colors->GetColor3d("Wheat").GetData());

    //outline
      vtkSmartPointer<vtkStructuredGridOutlineFilter> outline =
        vtkSmartPointer<vtkStructuredGridOutlineFilter>::New();
      outline->SetInputData(pl3d->GetOutput()->GetBlock(0));

      vtkSmartPointer<vtkPolyDataMapper> outlineMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      outlineMapper->SetInputConnection(outline->GetOutputPort());

      vtkSmartPointer<vtkActor> outlineActor =
        vtkSmartPointer<vtkActor>::New();
      outlineActor->SetMapper(outlineMapper);
      outlineActor->GetProperty()->SetColor(colors->GetColor3d("Wheat").GetData());

    // Add the actors to the renderer, set the background and size
    //
      ren1->AddActor(outlineActor);
      ren1->AddActor(planeActor);
      ren1->AddActor(cutActor);
      ren1->SetBackground(colors->GetColor3d("SlateGray").GetData());
      renWin->SetSize(640, 480);

      ren1->GetActiveCamera()->SetClippingRange(3.95297, 50);
      ren1->GetActiveCamera()->SetFocalPoint(9.71821, 0.458166, 29.3999);
      ren1->GetActiveCamera()->SetPosition(2.7439, -37.3196, 38.7167);
      ren1->GetActiveCamera()->SetViewUp(-0.16123, 0.264271, 0.950876);
      ren1->ResetCamera();
      ren1->GetActiveCamera()->Elevation(30);

    // render the image
    //
      renWin->Render();
      iren->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(CutStructuredGrid)

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

    add_executable(CutStructuredGrid MACOSX_BUNDLE CutStructuredGrid.cxx )

    target_link_libraries(CutStructuredGrid ${VTK_LIBRARIES})

### Download and Build CutStructuredGrid

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

    cd CutStructuredGrid/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:

    ./CutStructuredGrid

WINDOWS USERS

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