[vtkusers] Missing update extent request in vtkExtractVOI?

[Berk Geveci]

We are still working on this.

Meanwhile, you can use vtkImageResample.

Best,
-berk

On Wed, Nov 12, 2014 at 11:01 AM, Karsten Tausche <
karsten.tausche at student.hpi.uni-potsdam.de> wrote:

>  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> 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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