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ScaleGlyphs

vtk-examples/Cxx/Visualization/ScaleGlyphs


Question

If you have a question about this example, please use the VTK Discourse Forum

Code

ScaleGlyphs.cxx

#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkCubeSource.h>
#include <vtkFloatArray.h>
#include <vtkGlyph3D.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPointData.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  // Create points
  vtkNew<vtkPoints> points;
  points->InsertNextPoint(0, 0, 0);
  points->InsertNextPoint(5, 0, 0);
  points->InsertNextPoint(10, 0, 0);

  // Setup scales
  vtkNew<vtkFloatArray> scales;
  scales->SetName("scales");

  scales->InsertNextValue(1.0);
  scales->InsertNextValue(2.0);
  scales->InsertNextValue(3.0);

  // Combine into a polydata
  vtkNew<vtkPolyData> polydata;
  polydata->SetPoints(points);
  polydata->GetPointData()->SetScalars(scales);

  // Create anything you want here, we will use a cube for the demo.
  vtkNew<vtkCubeSource> cubeSource;

  vtkNew<vtkGlyph3D> glyph3D;
  glyph3D->SetScaleModeToScaleByScalar();
  glyph3D->SetSourceConnection(cubeSource->GetOutputPort());
  glyph3D->SetInputData(polydata);
  glyph3D->Update();

  // Create a mapper and actor
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputConnection(glyph3D->GetOutputPort());
  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);

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

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

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

  // Render and interact
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ScaleGlyphs)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersCore
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping ScaleGlyphs: ${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(ScaleGlyphs MACOSX_BUNDLE ScaleGlyphs.cxx )
  target_link_libraries(ScaleGlyphs PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ScaleGlyphs MACOSX_BUNDLE ScaleGlyphs.cxx )
  target_link_libraries(ScaleGlyphs PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ScaleGlyphs
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build ScaleGlyphs

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

cd ScaleGlyphs/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:

./ScaleGlyphs

WINDOWS USERS

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