[vtkusers] Bug in vtkPolyDataConnectivityFilter

[Kevin H. Hobbs]

On Fri, 2006-04-07 at 13:49 -0400, Kevin H. Hobbs wrote:
> I think I found a bug in vtkPolyDataConnectivityFilter, or at least
> misleading documentation.
> 
> The Documentation for mode 4 says "4) extract all regions sharing
> specified cell ids;" To me this means that the list of seed IDs will be
> used to seed different regions. GetNumberOfExtractedRegions should give
> me the number of seeds, and the regions should be colored differently if
> SetColorRegions is on. This is not what happens. Instead
> GetNumberOfExtractedRegions returns 1, and all the regions are given the
> same region number.

After looking at Graphics/vtkPolyDataConnectivityFilter.cxx I see the
comment on line 202, "regions have been seeded, everything considered in
same region" So I think it's the documentation that is wrong, for the
simple reason that it's easier to fix. A second connectivity filter with
SetExtractionModeToAllRegions will get what I want.


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