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.

Question

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

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();
  vtkSmartPointer<vtkImageReader2> reader;
  reader.TakeReference(
    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();

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(Glyph3DImage)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkIOImage
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping Glyph3DImage: ${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(Glyph3DImage MACOSX_BUNDLE Glyph3DImage.cxx )
  target_link_libraries(Glyph3DImage PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(Glyph3DImage MACOSX_BUNDLE Glyph3DImage.cxx )
  target_link_libraries(Glyph3DImage PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS Glyph3DImage
    MODULES ${VTK_LIBRARIES}
    )
endif ()

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

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