[vtkusers] example of vtkPolyDataConnectivityFilter

[David Doria]

On Wed, Dec 23, 2009 at 9:15 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Wed, Dec 23, 2009 at 8:42 PM, Jinyoung Hwang <hwangjinyoung at gmail.com> wrote:
>> 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
>>
>> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>> #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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>
> Excellent! I have added it to the wiki here:
> http://www.cmake.org/Wiki/VTK/Examples/vtkPolyDataConnectivityFilter
>
> Note that you do not have to call Delete() on objects that you have
> created with smart pointers, that is part of their power :)
>
> I think this type of contribution back to VTK will really make a difference!
>
> Thanks,
>
> David
>

Jinyoung,

Can you please send the test.vtk that you used for this example?

Thanks,

David