VTK/Examples/Cxx/Filtering/SurfaceFromUnorganizedPoints

#include <vtkVersion.h>
#include <vtkSmartPointer.h>
 
#include <vtkSurfaceReconstructionFilter.h>
#include <vtkProgrammableSource.h>
#include <vtkContourFilter.h>
#include <vtkReverseSense.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkPolyData.h>
#include <vtkCamera.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSphereSource.h>
#include <vtkXMLPolyDataReader.h>
 
int main(int argc, char *argv[])
{
 
  vtkSmartPointer<vtkPolyData> input;
  if(argc > 1)
    {
    vtkSmartPointer<vtkXMLPolyDataReader> reader =
      vtkSmartPointer<vtkXMLPolyDataReader>::New();
    reader->SetFileName(argv[1]);
    reader->Update();
    input = reader->GetOutput();
    }
  else
    {
    vtkSmartPointer<vtkSphereSource> sphereSource =
      vtkSmartPointer<vtkSphereSource>::New();
    sphereSource->Update();
    input = sphereSource->GetOutput();
    }
 
  vtkSmartPointer<vtkPolyData> polydata = 
    vtkSmartPointer<vtkPolyData>::New();
  polydata->SetPoints(input->GetPoints());
 
  // Construct the surface and create isosurface.	
  vtkSmartPointer<vtkSurfaceReconstructionFilter> surf = 
    vtkSmartPointer<vtkSurfaceReconstructionFilter>::New();
#if VTK_MAJOR_VERSION <= 5
  surf->SetInput(polydata);
#else
  surf->SetInputData(polydata);
#endif
 
  vtkSmartPointer<vtkContourFilter> cf = 
    vtkSmartPointer<vtkContourFilter>::New();
  cf->SetInputConnection(surf->GetOutputPort());
  cf->SetValue(0, 0.0);
 
  // Sometimes the contouring algorithm can create a volume whose gradient
  // vector and ordering of polygon (using the right hand rule) are
  // inconsistent. vtkReverseSense cures this problem.
  vtkSmartPointer<vtkReverseSense> reverse = 
    vtkSmartPointer<vtkReverseSense>::New();
  reverse->SetInputConnection(cf->GetOutputPort());
  reverse->ReverseCellsOn();
  reverse->ReverseNormalsOn();
 
  vtkSmartPointer<vtkPolyDataMapper> map = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  map->SetInputConnection(reverse->GetOutputPort());
  map->ScalarVisibilityOff();
 
  vtkSmartPointer<vtkActor> surfaceActor = 
    vtkSmartPointer<vtkActor>::New();
  surfaceActor->SetMapper(map);
 
  // Create the RenderWindow, Renderer and both Actors
  vtkSmartPointer<vtkRenderer> ren = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renWin = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renWin->AddRenderer(ren);
  vtkSmartPointer<vtkRenderWindowInteractor> iren = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renWin);
 
  // Add the actors to the renderer, set the background and size
  ren->AddActor(surfaceActor);
  ren->SetBackground(.2, .3, .4);
 
  renWin->Render();
  iren->Start();
 
  return EXIT_SUCCESS;
 
}