# ConvexPointSet

VTKExamples/Cxx/GeometricObjects/ConvexPointSet

### Code

ConvexPointSet.cxx

    #include <vtkSmartPointer.h>
    #include <vtkConvexPointSet.h>

    #include <vtkPoints.h>
    #include <vtkUnstructuredGrid.h>
    #include <vtkDataSetMapper.h>
    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkProperty.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>

    #include <vtkShrinkFilter.h>
    #include <vtkGlyph3DMapper.h>
    #include <vtkSphereSource.h>
    #include <vtkNamedColors.h>

    int main (int, char *[])
    {
      vtkSmartPointer<vtkConvexPointSet> cps =
        vtkSmartPointer<vtkConvexPointSet>::New();
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      points->InsertNextPoint( 0, 0, 0);
      points->InsertNextPoint( 1, 0, 0);
      points->InsertNextPoint( 1, 1, 0);
      points->InsertNextPoint( 0, 1, 0);
      points->InsertNextPoint( 0, 0, 1);
      points->InsertNextPoint( 1, 0, 1);
      points->InsertNextPoint( 1, 1, 1);
      points->InsertNextPoint( 0, 1, 1);
      points->InsertNextPoint( 0.5, 0, 0);
      points->InsertNextPoint( 1, 0.5, 0);
      points->InsertNextPoint( 0.5, 1, 0);
      points->InsertNextPoint( 0, 0.5, 0);
      points->InsertNextPoint( 0.5, 0.5, 0);

      for (int i = 0; i < 13; ++i)
      {
        cps->GetPointIds()->InsertId(i,i);
      }

      vtkSmartPointer<vtkUnstructuredGrid> ug =
        vtkSmartPointer<vtkUnstructuredGrid>::New();
      ug->Allocate(1,1);
      ug->InsertNextCell(cps->GetCellType(), cps->GetPointIds());
      ug->SetPoints(points);

      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

      vtkSmartPointer<vtkDataSetMapper> mapper =
        vtkSmartPointer<vtkDataSetMapper>::New();
      mapper->SetInputData(ug);

      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);
      actor->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());
      actor->GetProperty()->SetLineWidth(3);
      actor->GetProperty()->EdgeVisibilityOn();

      // Glyph the points
      vtkSmartPointer<vtkSphereSource> sphere =
        vtkSmartPointer<vtkSphereSource>::New();
      sphere->SetPhiResolution(21);
      sphere->SetThetaResolution(21);
      sphere->SetRadius(.03);

      // Create a polydata to store everything in
      vtkSmartPointer<vtkPolyData> polyData =
        vtkSmartPointer<vtkPolyData>::New();
      polyData->SetPoints(points);

      vtkSmartPointer<vtkGlyph3DMapper> pointMapper =
        vtkSmartPointer<vtkGlyph3DMapper>::New();
      pointMapper->SetInputData(polyData);
      pointMapper->SetSourceConnection(sphere->GetOutputPort());

      vtkSmartPointer<vtkActor> pointActor =
        vtkSmartPointer<vtkActor>::New();
      pointActor->SetMapper(pointMapper);
      pointActor->GetProperty()->SetColor(colors->GetColor3d("Peacock").GetData());

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

      //Add the actors to the scene
      renderer->AddActor(actor);
      renderer->AddActor(pointActor);
      renderer->SetBackground(colors->GetColor3d("Silver").GetData());

      renderer->ResetCamera();
      renderer->GetActiveCamera()->Azimuth(210);
      renderer->GetActiveCamera()->Elevation(30);
      renderer->ResetCameraClippingRange();

      //Render and interact
      renderWindow->SetSize(640, 480);
      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ConvexPointSet)

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

    add_executable(ConvexPointSet MACOSX_BUNDLE ConvexPointSet.cxx )

    target_link_libraries(ConvexPointSet ${VTK_LIBRARIES})

### Download and Build ConvexPointSet

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

    cd ConvexPointSet/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:

    ./ConvexPointSet

WINDOWS USERS

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