[vtkusers] Re: PolyData Points Delete.

[Goodwin Lawlor]

Hi Dongqing

The output of vtkExtractCells is an unstructured grid - you can't just 
type cast it to a polydata for use with a vtkPolyDataMapper - you have 
to use vtkDataSetMapper instead.

hth

Goodwin

Dongqing Chen wrote:
> Dear Goodwin and vtk users:
>
>   Thanks for your help. After I looked through the related parts, I 
> wrote my codes. Although there was no compile error, but some errors 
> happened when running the program.
>
>   Some code patches are listed below.
>
>   Pts saves the points what I want to delete from the original 
> vtkPolyData colonPolyp, now I generate the newcolonPolyp containing 
> the new data after deleting the undesired data from colonPolyp, then 
> render and display the newcolonPolyp.
>
>   sorry for not finding some examples on how to use vtkExtractCell. 
> Would u please give me some hints? I am wondering there should be some 
> problems when I use vtkExtractCell class.
>
>   Thanks a lot.
> ____________________________________________________________
> vtkIdList *ptrIds = vtkIdList::New();
>
>  for (i=0; i<cellNum; i++)
>  {
>      ptrIds->InsertNextId(Pts[i]);
>   }
>
>
>  vtkExtractCells *newcolonPolyp =vtkExtractCells::New();
>  newcolonPolyp->SetInput(colonPolyp);
>  newcolonPolyp->SetCellList(ptrIds);
>
> // Link New Color Coding Scheme
>  vtkPolyDataMapper *map = vtkPolyDataMapper::New();
>  newcolonPolyp->Update();
>  //map->SetInput(colonPolyp);
>  map->SetInput((vtkPolyData*)newcolonPolyp->GetOutput());
> ________________________________________________________________
>
> Best Wishes,
> -----------------------------------------------------------------
> Dongqing Chen
> Ph.D Research Assistant
> Rm. 07, Paul C. Lutz Hall
> Computer Vision & Image Processing (CVIP) Lab
> Department of Electrical & Computer Engineering
> Speed School of Engineering
> University of Louisville
> Louisville, KY. 40292
> U.S.A
> Email: dqchen at cvip.louisville.edu
> Phone:+1-502-852-2789 (Lab)
>            +1-502-852-6130 (Office)
> -----------------------------------------------------------------
> ----- Original Message ----- From: "Goodwin Lawlor" 
> <goodwin.lawlor at ucd.ie>
> To: <vtkusers at public.kitware.com>
> Sent: Tuesday, September 26, 2006 1:30 PM
> Subject: [vtkusers] Re: PolyData Points Delete.
>
>
>> Hi,
>>
>> Have a look at this class already included in VTK:
>> http://www.vtk.org/doc/nightly/html/classvtkExtractCells.html
>>
>> hth
>>
>> Goodwin
>>
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>