[vtkusers] vtkImageReslice zoomed performance - no clipping?

[David Gobbi]

Hi Henning,

The vtkImageReslice filter will clip the image if you call
SetOutputExtent(), or if you don't set the OutputExtent, then clipping
is done according the UpdateExtent set by the pipeline.  So those are
the only ways to change the clipping: either set it manually with
SetOutputExtent, or fiddle with the downstream filters to change the
UpdateExtent.

I've wanted to write an easier-to-use alternative to vtkImageReslice
for a very long time (there really isn't any way to make
vtkImageReslice "smarter" without breaking backwards compatibility in
one way or another).

   David


On Thu, Jun 24, 2010 at 9:13 AM, Henning Meyer <tutmann at gmail.com> wrote:
> Hi!
>
> When using vtkImageReslice, I get very low performance, once I zoom
> into an image. It seems, that vtkImageReslice is rendering a huge
> virtual image, and is clipping after that, is that true? Could it be
> changed to be clipped before? Also I found, the clipping is not always
> correct, as sometimes with certain transforms the output image gets
> clipped inside the render window.
> Is there anything I could do here?
>
> Thank you,
>
> Henning
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