[vtkusers] connectivity filter and hull

[David Netherway]

Hello vtkusers,

I am using the following:

vtkImageData->vtkContourFilter->vtkPolyDataConnectivyFilter->vtkHull

with the connectivity set using "SetExtractionModeToLargestRegion".

The hull surrounds all of the isosurface not just the largest surface.

If I set the connectivity to "SetExtractionModeToClosestPointRegion" and set
the point near the largest surface then the hull surrounds just the largest
surface as expected.

If I use the following I get the expected behaviour:

vtkImageData->vtkContourFilter->vtkPolyDataConnectivyFilter->vtkDecimatePro-
>vtkHull

Does anyone get the expected behaviour for the first pipeline above or know
of the problem?

I am using vtk4.1.1 Revision 1.1215 from May 14, 2002 on a windows platform.

Thanks, David

----- Original Message -----
From: "ady roman" <ady_roman at yahoo.com>
To: <vtkusers at public.kitware.com>
Sent: Tuesday, 21 May, 2002 1:26 AM
Subject: [vtkusers] DecimatePro and deciFranCut example


>
> Could some explain me how to use DecimatePro Filter?
> I don't quite understand what the deciFranCut example
> does :
>
> set topologies "On Off"
> set accumulates "On Off"
> foreach topology $topologies {
>   foreach accumulate $accumulates {
>     vtkDecimatePro deci$topology$accumulate
>       deci$topology$accumulate SetInput [fran
> GetOutput]
>       deci$topology$accumulate SetTargetReduction .95
>       deci$topology$accumulate
> PreserveTopology$topology
>       deci$topology$accumulate
> AccumulateError$accumulate
>     vtkPolyDataMapper mapper$topology$accumulate
>       mapper$topology$accumulate SetInput
> [deci$topology$accumulate GetOutput]
>     vtkActor fran$topology$accumulate
>       fran$topology$accumulate SetMapper
> mapper$topology$accumulate
>       fran$topology$accumulate SetTexture atext
>   }
> }
>
> How can I do this in C++?
>
> Regards,
> A.Roman
>
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