[vtkusers] vtkSelection and vtkExtractSelected*

[John Norris]

Sounds good, that's more or less what I was thinking.  I suppose I could 
go ahead and add proper support for PRESERVE_TOPOLOGY and 
CONTAINING_CELLS.  The vtkExtractSelected* filters would all have to 
overload RequestDataObject() if I do that (vtkExtractSelectedFrustum 
already does), but then you could remove vtkExtractSelectedPolyDataIds.

John

David E DeMarle wrote:
> That does sound like a good idea. How about calling it INVERSE, and 
> adding that as a property to vtkSelection. Then make the 
> vtkExtractSelected* filters respect it. Probably the best place to do 
> that is where each filters inspects individual points and cells.
> 
> I'm too busy to try it in the short term but would be glad to help.
> 
> cheers
> Dave DeMarle
> 
> On 3/21/07, *John Norris* < jnorris at mcs.anl.gov 
> <mailto:jnorris at mcs.anl.gov>> wrote:
> 
>     Hi,
> 
>     I've got a feature request regarding vtkSelection and the vtkExtract*
>     filters that use it.  It would be really helpful if there was some sort
>     of "ReverseSense" or "EverythingElseExcept" option, either as flags in
>     the algorithms or as an information field in vtkSelection.  Basically I
>     want to turn the selection list into an exclusion list.
> 
>     I can make these changes myself; they're fairly straight-forward.  I'd
>     be willing to contribute them if it something that Ken Martin, Will
>     Schroeder, and Bill Lorensen deem valuable enough.
> 
>     John

-- 
John Norris
Research Programmer
Center for Simulation of Advanced Rockets
http://www.uiuc.edu/ph/www/jnorris