[vtkusers] Resampling Image while interacting

[Mathieu Malaterre]

On Thu, Dec 11, 2008 at 4:22 PM, Michael Knopke <Michael.Knopke at gmx.de> wrote:
> Hello,
>
> I found a similar problem in the forum but without answer, so I try here
> again.
>
>
>
> What I want is to change the resolution of an image shown with
> vtkImageViewer2 to improve speed while interacting with it. (and after
> interaction show the unscaled image)
>
> Basically this would be no problem by using observers and vtkImageResample
> (or Reslice) and changing Spacing/Extent on the fly (or
> AxisMagnificationFactor which seems to do the same).
>
> Anyway while setting those factors (e.g. 0.5) once at the beginning of the
> pipeline resamples the image as expected (and improves speed), but it
> crashes when changing it after the viewer already showed an image with
> different spacing.
>
> While calling UpdateWholeExtent prevents crashing, it doesn't resample the
> image but just changes the extent (capping parts of the image).
>
>
>
> VTK: latest cvs checkout

Can you send a small c++ piece of code to reproduce the issue ?

Thanks.

-- 
Mathieu