[vtkusers] Missing update extent request in vtkExtractVOI?

[Karsten Tausche]

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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