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Glyph3DImage

Repository source: 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 question about this example, please use the VTK Discourse Forum

Code

Glyph3DImage.cxx

#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkGlyph3DMapper.h>
#include <vtkImageReader2.h>
#include <vtkImageReader2Factory.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>

#include <iostream>
#include <string>

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

  // Read file.
  vtkNew<vtkImageReader2Factory> readerFactory;
  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).
  vtkNew<vtkPoints> points;
  const float p[3] = {0.0, 0.0, 0.0};
  points->InsertNextPoint(p);

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

  // Create a polydata object.
  vtkNew<vtkPolyData> point;
  point->SetPoints(points);
  point->SetVerts(vertices);

  vtkNew<vtkGlyph3DMapper> glyph3Dmapper;
  glyph3Dmapper->SetSourceData(point);
  glyph3Dmapper->SetInputConnection(reader->GetOutputPort());
  glyph3Dmapper->Update();

  vtkNew<vtkNamedColors> colors;

  vtkNew<vtkActor> actor;
  actor->SetMapper(glyph3Dmapper);
  actor->GetProperty()->SetPointSize(3);

  // Create a renderer, render window, and interactor.
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("Glyph3DImage");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  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 3.12 FATAL_ERROR)

project(Glyph3DImage)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  IOImage
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "Glyph3DImage: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
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}
)

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.