[vtkusers] Missing update extent request in vtkExtractVOI?

[Karsten Tausche]

Hi,

any news about that topic?
I need to change the sampling rate of an image dynamically. Are there 
any other ways to achieve this?

Best regards,
Karsten

On 2014-10-13 16:16, Berk Geveci wrote:
> 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 
> <mailto: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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