[vtkusers] vtkImageThresholdConnectivity

David Gobbi david.gobbi at gmail.com
Fri Sep 5 13:04:14 EDT 2014

Hi Maarten,

I think it might be a bug, so I will investigate.  This filter needs
the whole extent from the input because it does a 3D connectivity
operation, but that shouldn't impact the extent that it produces as
output.  If asked for a single-slice output extent, then it should
pull in a 3D input extent but produce a 2D output extent.

 - David

On Fri, Sep 5, 2014 at 10:40 AM, Maarten Beek via vtkusers
<vtkusers at vtk.org> wrote:
> Hi all,
> I have a problem with vtkImageThresholdConnectivity in a pipeline with
> vtkImageSlice.
> The vtkImageSlice reduces the extent of the image to the slice that is
> visible, and vtkImageThresholdConnectivity allocates its output accordingly.
> However it then takes the scalar pointer of the output for the extent of the
> (3d) input image.
> This happens on line 448 of vtkImageThresholdConnectivity.cxx (VTK 6.1.0).
> Is this a bug, or am I doing something wrong?
> Thanks - Maarten

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