[vtkusers] Re: vtkRemoveCellsFilter use ?

[Mathieu Malaterre]

Goowin,

	One last remark, your filter deal well with triangle strips. Could you 
please add in the doc to run vtkTriangleFilter first.

Thanks
mathieu

Goodwin Lawlor wrote:
> Hi Mathieu,
> The problem is the class was intend to be used with a graphics pipeline and
> a vtkCellPicker which updates the filter at least once before you get a
> chance to call RemoveCell (I should have put a check in the code). So if you
> try:
> 
> from vtk import *
> 
> reader = vtkSphereSource()
>  reader.Update()
> 
>  #The following two lines doesn't make any differences:
>  #reader.GetOutput().BuildLinks(0) #default val is not wrap
>  #reader.GetOutput().BuildCells()
> 
>  #print reader.GetOutput().GetNumberOfCells() #96
>  #reader.GetOutput().DeleteCell( 10 ) #ok
> 
>  remove = vtkRemoveCellsFilter()
>  remove.SetInput( reader.GetOutput() )
>  remove.Update()
>  remove.RemoveCell( 10 )
> 
> print remove.GetOutput().GetNumberOfCells()
> 
> 
> HTH
> 
> Goodwin
> 
> ps I'll update the class do you don't have to explicitly update it before
> calling RemoveCell
> 
> ----- Original Message -----
> From: "Mathieu Malaterre" <Mathieu.Malaterre at creatis.insa-lyon.fr>
> To: <goodwin.lawlor at ucd.ie>
> Cc: "VTK-User" <vtkusers at vtk.org>
> Sent: Wednesday, July 30, 2003 3:41 PM
> Subject: vtkRemoveCellsFilter use ?
> 
> 
> 
>>Hi all,
>>
>>I have tried the vtkRemoveCellsFilter class, but I failed to make it
>>work. I am getting a seg fault.
>>Could someone told how to use it, or why this simple script fails:
>>
>>##############################
>>from vtk import *
>>
>>reader = vtkSphereSource()
>>reader.Update()
>>
>>#The following two lines doesn't make any differences:
>>#reader.GetOutput().BuildLinks(0) #default val is not wrap
>>#reader.GetOutput().BuildCells()
>>
>>#print reader.GetOutput().GetNumberOfCells() #96
>>#reader.GetOutput().DeleteCell( 10 ) #ok
>>
>>remove = vtkRemoveCellsFilter()
>>remove.SetInput( reader.GetOutput() )
>>remove.RemoveCell( 10 )
>>##############################
>>
>>Thanks
>>mathieu
>>
>>Problem is coming from:
>>
>>void RemoveCell(vtkIdType cellid) {
>>this->CellIdList->DeleteId(this->CellIdList->GetId(cellid));
>>                   ^^^^^^^^
>>this->Modified();
>>}
>>
>>DeleteId is call on element number 10...therefore I am getting a seg fault
>>
>>REF:
>>http://www.bioengineering-research.com/vtk/vtkRemoveCellsFilter.htm
>>
>>
> 
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-- 
Mathieu Malaterre
CREATIS
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B.P. Lyon-Montchat
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http://www.creatis.insa-lyon.fr/~malaterre/