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

[Berk Geveci]

Great.


On Fri, Nov 19, 2010 at 3:29 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> It was crashing in AllocateData for vtkImageData.  As long as you
> think that the empty extent solution is fine, then I can find out why
> it isn't working and then post a fix on Gerrit for you to review.  I'm
> hoping that only minor changes will be required, but that remains to
> be seen.
>
>  David
>
>
> On Fri, Nov 19, 2010 at 12:35 PM, Berk Geveci <berk.geveci at kitware.com>
> wrote:
> > 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
> >> _______________________________________________
> >> Powered by www.kitware.com
> >>
> >> Visit other Kitware open-source projects at
> >> http://www.kitware.com/opensource/opensource.html
> >>
> >> Follow this link to subscribe/unsubscribe:
> >> http://www.vtk.org/mailman/listinfo/vtk-developers
> >>
> >
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtk-developers/attachments/20101120/9190dc17/attachment.html>