# Glyph3DImage

VTKExamples/Cxx/Visualization/Glyph3DImage

### Description

Supply an image to this example and see the image points glyphed with a vtkPoint. To see the points you may have to interactively zoom the image.

Note

vtkGlyph3DMapper can glyph points from any type of vtkDataObject that has vtkPoints.

### Code

Glyph3DImage.cxx

    #include <vtkSmartPointer.h>
    #include <vtkGlyph3DMapper.h>

    #include <vtkImageReader2Factory.h>
    #include <vtkImageReader2.h>
    #include <vtkImageData.h>

    #include <vtkCellArray.h>
    #include <vtkPoints.h>
    #include <vtkPolyData.h>
    #include <vtkSphereSource.h>
    #include <vtkActor.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>

    #include <vtkNamedColors.h>

    int main(int argc, char *argv[])
    {
      // Verify command line arguments
      if (argc < 2 )
      {
        std::cout << "Usage: " << argv[0] << " BinaryImage" << std::endl;
        return EXIT_FAILURE;
      }

      // Read file
      vtkSmartPointer<vtkImageReader2Factory> readerFactory =
        vtkSmartPointer<vtkImageReader2Factory>::New();
      vtkImageReader2 *reader = readerFactory->CreateImageReader2(argv[1]);
      reader->SetFileName(argv[1]);

      // Create anything you want here, we will use a point
      // Create the geometry of a point (the coordinate)
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      const float p[3] = {0.0, 0.0, 0.0};
      points->InsertNextPoint(p);

      vtkSmartPointer<vtkCellArray> vertices =
        vtkSmartPointer<vtkCellArray>::New();
      vtkIdType pid[1];
      pid[0] = points->InsertNextPoint(p);
      vertices->InsertNextCell(1,pid);

      // Create a polydata object
      vtkSmartPointer<vtkPolyData> point =
        vtkSmartPointer<vtkPolyData>::New();
      point->SetPoints(points);
      point->SetVerts(vertices);

      vtkSmartPointer<vtkGlyph3DMapper> glyph3Dmapper =
        vtkSmartPointer<vtkGlyph3DMapper>::New();
      glyph3Dmapper->SetSourceData(point);
      glyph3Dmapper->SetInputConnection(reader->GetOutputPort());
      glyph3Dmapper->Update();

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

      vtkSmartPointer<vtkActor> actor =
        vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(glyph3Dmapper);
      actor->GetProperty()->SetPointSize(3);

      // 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 actor to the scene
      renderer->AddActor(actor);
      renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());

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

      reader->Delete();
      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(Glyph3DImage)

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

    add_executable(Glyph3DImage MACOSX_BUNDLE Glyph3DImage.cxx )

    target_link_libraries(Glyph3DImage ${VTK_LIBRARIES})

### Download and Build Glyph3DImage

Click here to download Glyph3DImage and its CMakeLists.txt file. Once the tarball Glyph3DImage.tar has been downloaded and extracted,

    cd Glyph3DImage/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:

    ./Glyph3DImage

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