[vtkusers] How to really delete cells?

[Dominik Szczerba]

Well ConnectivityFilter should do this job for you - no need for extra 
cell removal by foot.

-- Dominik

Stephane PLOIX wrote:
> 
> my_polyData is at the end of a pipeline. Each time you Update it (which 
> is done at each frame if you render it), it is reset to the output of 
> the previous filter.
> If you want to break the dependency chain, you have to insert a 
> ShallowCopy :
> output = my_vtkPolyDataConnectivityFilter->GetOutput();
> my_polyData = vtkPolyData::New();
> my_polyData ->ShallowCopy(output);
> ...
> and remeber to call my_polyData ->Delete() later.
> 
> But the best way would be to implement a filter that does the job to 
> remove some cells, so that your pipeline is still connected.
> 
> Stephane
> 
> 
> 
> 
> *cocoricore at gmail.com*
> Envoyé par : vtkusers-bounces at vtk.org
> 
> 28/07/2009 15:47
> 
> 	
> A
> 	dominik at itis.ethz.ch
> cc
> 	vtkusers at vtk.org
> Objet
> 	Re: [vtkusers] How to really delete cells?
> 
> 
> 	
> 
> 
> 
> 
> 
> No change.
> 
> 2009/7/28 Dominik Szczerba < dominik at itis.ethz.ch 
> <mailto:dominik at itis.ethz.ch> >
> And what does calling ->Update() ?
> 
> Corinne Tith wrote:
> Thanks for your help. I tried to put your code after 
> my_polyData->RemoveDeletedCells();
> Unfortunately It doesn't work.
> I tried to delete lot of cells, they are never really removed.
> 
> My VTK version is 5.2, does it matter?
> 
> 
> 2009/7/28 Dominik Szczerba < dominik at itis.ethz.ch 
> <mailto:dominik at itis.ethz.ch> <mailto: dominik at itis.ethz.ch 
> <mailto:dominik at itis.ethz.ch> >>
> 
> 
>    my_polyData->Modified()
> 
>    Corinne Tith wrote:
> 
>        Hi all,
> 
>        I get a polydata volume with a vtkContourFilter and a
>        vtkWindowSincPolyDataFilter.
>        Some cells are not connected to the largest volume. They seem to
>        be 'on' the mesh but have no vertice in common.
> 
>        I tried the filters vtkCleanPolyData and
>        vtkPolyDataConnectivityFilter, but most of my unconnected cells
>        are not removed.
>        Finally, I tried to delete them 'manually', but nothing happens.
> 
>        How can I really remove my unconnected cells?
> 
>        Any help is appreciated, thanks!
> 
> 
>        // generate my volume
>       
>  my_vtkWindowSincPolyDataFilter->SetInputConnection(my_vtkContourFilter->GetOutputPort());
> 
>        // no effect on my cells
>       
>  my_vtkCleanPolyData->SetInputConnection(my_vtkWindowSincPolyDataFilter->GetOutputPort());
> 
>        my_vtkCleanPolyData->PointMergingOn();
>       
>  my_vtkPolyDataConnectivityFilter->SetInputConnection(my_vtkContourFilter->GetOutputPort());
>        my_vtkPolyDataConnectivityFilter->SetExtractionModeToLargestRegion();
>        // manual remove
>        my_vtkPolyDataConnectivityFilter->Update();
>        my_polyData = my_vtkPolyDataConnectivityFilter->GetOutput();
>        for(int i = 0; i < n; i++){
>              my_polyData->DeleteCell(cellsToRemove[i]);
>        }
>        my_polyData->RemoveDeletedCells();
> 
> 
>       
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