[vtkusers] Missing update extent request in vtkExtractVOI?

[Berk Geveci]

We completely rewrote vtkExtractVOI a few months ago and it doesn't look
like we didn't do a great job in fully evaluating it. I will spend some
quality time with it in the next few weeks.

Best,
-berk

On Sun, Oct 12, 2014 at 2:06 PM, Karsten Tausche <
karsten.tausche at student.hpi.uni-potsdam.de> wrote:

>  I just realized that calling SetUpdateExtentToWholeExtent() on a
> downstream algorithm (polyData in the example code) "fixes" this error.
>
>
> On 2014-10-11 14:10, Karsten Tausche wrote:
>
> Hi everyone,
>
> I tried to use vtkExtractVOI to decrease the resolution of a
> vtkImageData/vtkStructuredPoints data set. This works fine when I set the
> sample rate before I connect the filter to the pipeline. But changing the
> sample rate while rendering always results in an error like this:
>
> "ERROR: In
> ..\..\..\Common\ExecutionModel\vtkStreamingDemandDrivenPipeline.cxx, line
> 857
> vtkCompositeDataPipeline (0000000005D6E1A0): The update extent specified
> in the information for output port 0 on algorithm
> vtkExtractVOI(0000000005D92710) is 0 10 0 10 0 0, which is outside the
> whole extent 0 9 0 10 0 0."
>
> This behavior also depends on the initial sample rate. With the defaults
> (1, 1, 1), the error message pops up after changing the rate, and the
> filter seems produce the expected result. When I set different initial
> values and increase them while rendering, I get the error message above,
> but the filter result seems correct. When decreasing the sample rate, I
> don't get an error, but the filter decreases the size of the rendered
> image.
>
> I'm using the current VTK master. I appended a small example the produces
> this error; it doesn't render any visible points but I didn't know how to
> enforce the required updates without adding the filter to a rendering
> pipeline.
>
> BTW the error also occurs with vtkStructuredGrid+vtkExtractGrid.
>
> Thanks,
> Karsten
>
>
>
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