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    Hi,<br>
    <br>
    any news about that topic?<br>
    I need to change the sampling rate of an image dynamically. Are
    there any other ways to achieve this?<br>
    <br>
    Best regards,<br>
    Karsten<br>
    <br>
    <div class="moz-cite-prefix">On 2014-10-13 16:16, Berk Geveci wrote:<br>
    </div>
    <blockquote
cite="mid:CAE32kpUMhinzw_ZfJ6QpY-nwQ0LW0pq09f+tLVyZ1Rx6VPxJXQ@mail.gmail.com"
      type="cite">
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      <div dir="ltr">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.
        <div><br>
        </div>
        <div>Best,</div>
        <div>-berk</div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Sun, Oct 12, 2014 at 2:06 PM,
          Karsten Tausche <span dir="ltr"><<a moz-do-not-send="true"
              href="mailto:karsten.tausche@student.hpi.uni-potsdam.de"
              target="_blank">karsten.tausche@student.hpi.uni-potsdam.de</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor="#FFFFFF" text="#000000"> I just realized that
              calling SetUpdateExtentToWholeExtent() on a downstream
              algorithm (polyData in the example code) "fixes" this
              error.
              <div>
                <div class="h5"><br>
                  <br>
                  <div>On 2014-10-11 14:10, Karsten Tausche wrote:<br>
                  </div>
                </div>
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              <blockquote type="cite">
                <div>
                  <div class="h5">Hi everyone, <br>
                    <br>
                    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: <br>
                    <br>
                    "ERROR: In
                    ..\..\..\Common\ExecutionModel\vtkStreamingDemandDrivenPipeline.cxx,
                    line 857 <br>
                    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." <br>
                    <br>
                    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. <br>
                    <br>
                    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. <br>
                    <br>
                    BTW the error also occurs with
                    vtkStructuredGrid+vtkExtractGrid. <br>
                    <br>
                    Thanks, <br>
                    Karsten <br>
                    <br>
                    <br>
                    <fieldset></fieldset>
                    <br>
                  </div>
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