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    <p>Thanks Andy. I could try to implement a Programmable filter
      because even if i able to use Threshold filter it is hard to track
      multiple region produced by Threshold filter separately. <br>
    </p>
    <p>--ufuk<br>
    </p>
    <div class="moz-cite-prefix">On 23.04.2018 09:54, Andy Bauer wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAMaOp+GYfV8_xd4mX=dDGk5d6KvbxH+PAz1awWrzR1axvSe4BA@mail.gmail.com">
      <div dir="ltr">
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            <div>
              <div>Hi Ufuk,<br>
                <br>
              </div>
              The threshold filter operates on scalar/single component
              arrays only. Also, underneath the covers it operates on
              cell data exclusively so if you request thresholding on
              point data it will do a point data to cell data operation
              as well.<br>
              <br>
            </div>
            I'm not aware of any filters in PV that would allow you to
            track a thresholded quantity. Unfortunately I can't think of
            any moderately easy way to do this in PV either. <br>
            <br>
          </div>
          Best,<br>
        </div>
        Andy<br>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Fri, Apr 20, 2018 at 4:40 PM, Ufuk
          Turuncoglu <span dir="ltr"><<a
              href="mailto:u.utku.turuncoglu@be.itu.edu.tr"
              target="_blank" moz-do-not-send="true">u.utku.turuncoglu@be.itu.edu.tr</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">I could
            have vorticty as a new variable by using PythonCalculator.
            now, i need to follow points extracted from vorticity field
            in time and create poly line. so, I tried particle tracer
            and particle path bu no luck yet!<br>
            <br>
            Regards,<br>
            <br>
            --ufuk<br>
            <div class="HOEnZb">
              <div class="h5"><br>
                ----- Original Message -----<br>
                From: "Ufuk Utku Turuncoglu (BE)" <<a
                  href="mailto:u.utku.turuncoglu@be.itu.edu.tr"
                  moz-do-not-send="true">u.utku.turuncoglu@be.itu.edu.<wbr>tr</a>><br>
                To: "paraview" <<a
                  href="mailto:paraview@paraview.org"
                  moz-do-not-send="true">paraview@paraview.org</a>><br>
                Sent: Friday, April 20, 2018 3:09:35 PM<br>
                Subject: [Paraview] extract voriticy and follow it in
                time<br>
                <br>
                Hi,<br>
                <br>
                I would like to use Threshold filter for Vorticity field
                calculated by <br>
                ComputeDreivatives but in the variables list i could not
                see Vorticity <br>
                field. So, is it possible to do it with any other way
                such as <br>
                programmable filter etc. If i extract it from the whole
                data, then, i <br>
                would like to follow it to create polyline that
                represent path of the <br>
                selected region. So, is there any simple way to do that?<br>
                <br>
                Best Regards,<br>
                <br>
                --ufuk<br>
                <br>
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