[vtk-developers] Pipeline connections that pull information but not data

[Berk Geveci]

I'd say that we should make it possible to ask for an empty extent. Where is
it crashing?

On Thu, Nov 18, 2010 at 12:25 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> Hi All,
>
> I'm working on a difficult problem, and would appreciate any pointers
> that the pipeline experts can give me.  Some of the classes that I
> contributed to VTK way back before the VTK 5 release still use some
> VTK 4 pipeline mechanisms.  I've been gradually converting them to the
> new executive, but I've a wall.
>
> In vtkImageReslice there is a method called SetInformationInput(),
> that allows the primary input image to be resampled to match the
> "information input" image.  I implemented this by calling
> UpdateInformation() on the InformationInput, so that I can pull just
> the information from that input and not the data.
>
> In the VTK 5 executive, there does not seem to be any way to establish
> a pipeline connection that only pulls information.  When REQUEST_DATA
> goes to the executive it is always forwarded to all inputs.  I've
> tried the obvious thing, which is to set an empty UPDATE_EXTENT on the
> input that I don't want any data from, but this causes a segfault.
>
> Any ideas?
>
>  David
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