[vtkusers] example of vtkPolyDataConnectivityFilter

[Jinyoung Hwang]

Hi all,

I implemented an example of vtkPolyDataConnectivityFilter, because
vtk wiki do not provide it yet.
You can use it as below codes.

Thanks,

Jinyoung

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#include "vtkSmartPointer.h"
#include "vtkStructuredPointsReader.h"
#include "vtkMarchingCubes.h"
#include "vtkPolyDataConnectivityFilter.h"
#include "vtkPolyDataMapper.h"
#include "vtkActor.h"
#include "vtkProperty.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"

int main(int argc, char* argv[])
{
 // data load
 vtkSmartPointer<vtkStructuredPointsReader> reader =
vtkSmartPointer<vtkStructuredPointsReader>::New();
 reader->SetFileName("test.vtk");
 reader->Update();
 // MC is used to display in 3D
 vtkSmartPointer<vtkMarchingCubes> cubes =
vtkSmartPointer<vtkMarchingCubes>::New();
 cubes->SetInputConnection(reader->GetOutputPort());
 cubes->ComputeNormalsOn();
 cubes->ComputeGradientsOn();
 cubes->SetValue(0, 20);
 cubes->Update();
 // this is to use remove other parts of largest region
 // you can set specific region using
'SetExtractionModeToPointSeededRegions' function
 vtkSmartPointer<vtkPolyDataConnectivityFilter> cfilter =
vtkSmartPointer<vtkPolyDataConnectivityFilter>::New();
 cfilter->SetInputConnection(cubes->GetOutputPort());
 cfilter->SetExtractionModeToLargestRegion();
 //cfilter->SetExtractionModeToPointSeededRegions();
 //cfilter->SetClosestPoint(x,y,z);
 cfilter->Update();
 // create a mapper
 vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
 mapper->SetInputConnection(cfilter->GetOutputPort());
 mapper->ScalarVisibilityOn();
 mapper->Update();
 // create an actor
 vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
 actor->GetProperty()->SetColor(1,1,1);
 actor->SetMapper(mapper);

 // create a renderer
 vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
 renderer->AddActor(actor);
 // create a render window
 vtkSmartPointer<vtkRenderWindow> renwin =
vtkSmartPointer<vtkRenderWindow>::New();
 renwin->AddRenderer(renderer);

 // create an interactor
 vtkSmartPointer<vtkRenderWindowInteractor> iren =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
 iren->SetRenderWindow(renwin);
 iren->Initialize();
 iren->Start();
 reader->Delete();
 cubes->Delete();
 cfilter->Delete();
 mapper->Delete();
 actor->Delete();
 renderer->Delete();
 renwin->Delete();
 iren->Delete();

 return 0;
}
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