ScaleGlyphs

VTKExamples/Cxx/Visualization/ScaleGlyphs


Code

ScaleGlyphs.cxx

#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkPointData.h>
#include <vtkCubeSource.h>
#include <vtkPolyData.h>
#include <vtkPoints.h>
#include <vtkGlyph3D.h>
#include <vtkCellArray.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkFloatArray.h>

int main(int, char *[])
{
  // Create points
  vtkSmartPointer<vtkPoints> points = 
    vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint(0,0,0);
  points->InsertNextPoint(5,0,0);
  points->InsertNextPoint(10,0,0);

  // Setup scales
  vtkSmartPointer<vtkFloatArray> scales = 
    vtkSmartPointer<vtkFloatArray>::New();
  scales->SetName("scales");

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

  // Combine into a polydata
  vtkSmartPointer<vtkPolyData> polydata = 
    vtkSmartPointer<vtkPolyData>::New();
  polydata->SetPoints(points);
  polydata->GetPointData()->SetScalars(scales);

  // Create anything you want here, we will use a cube for the demo.
  vtkSmartPointer<vtkCubeSource> cubeSource = 
    vtkSmartPointer<vtkCubeSource>::New();

  vtkSmartPointer<vtkGlyph3D> glyph3D = 
    vtkSmartPointer<vtkGlyph3D>::New();
  glyph3D->SetScaleModeToScaleByScalar();
  glyph3D->SetSourceConnection(cubeSource->GetOutputPort());
#if VTK_MAJOR_VERSION <= 5
  glyph3D->SetInput(polydata);
#else
  glyph3D->SetInputData(polydata);
#endif
  glyph3D->Update();

  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(glyph3D->GetOutputPort());
  vtkSmartPointer<vtkActor> actor = 
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  // 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(1,1,1); // Background color white

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(ScaleGlyphs)

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

add_executable(ScaleGlyphs MACOSX_BUNDLE ScaleGlyphs.cxx )

target_link_libraries(ScaleGlyphs ${VTK_LIBRARIES})

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.