<div dir="ltr">Hi Ufuk,<div><br></div><div>The Merge Blocks filter will work locally on each process and shouldn't move any of the data between MPI processes since it's a trivially parallel operation. When doing volume rendering of unstructured grids (the output dataset type of the merge blocks filter) with Ice-T in parallel, there will be data moved around in order to simplify and reduce the parallel communication by constructing convex partitions.</div><div><br></div><div>I don't know how NVIDIA's Index plugin works in parallel but my guess would be that it also wants convex partitions.</div><div><br></div><div>Cheers,</div><div>Andy</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Sep 21, 2017 at 3:14 AM, Ufuk Utku Turuncoglu (BE) <span dir="ltr"><<a href="mailto:u.utku.turuncoglu@be.itu.edu.tr" target="_blank">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">
  
    
  
  <div text="#000000" bgcolor="#FFFFFF">
    <div class="m_8239251655144214895moz-cite-prefix">Hi Andy,<br>
      <br>
      Thanks for the clarification. One minor question, after applying
      Merge Blocks is it still processing in serial mode or can i use
      MPI to improve the performance? By the way, i am also using NVIDIA
      Index plugin. I think that it supports parallel rendering but
      again not for multi block dataset. Right?<br>
      <br>
      Regards,<br>
      <br>
      --ufuk<div><div class="h5"><br>
      <br>
      On 20/09/2017 22:12, Andy Bauer wrote:<br>
    </div></div></div><div><div class="h5">
    <blockquote type="cite">
      <div dir="ltr">Hi Ufuk,
        <div><br>
        </div>
        <div>ParaView doesn't currently support volume rendering of
          multiblock datasets, even in serial, so using the Merge Blocks
          filter is probably the best way to do any volume rendering of
          your dataset.</div>
        <div><br>
        </div>
        <div>Cheers,</div>
        <div>Andy</div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Wed, Sep 20, 2017 at 2:45 PM, Ufuk
          Turuncoglu <span dir="ltr"><<a href="mailto:u.utku.turuncoglu@be.itu.edu.tr" target="_blank">u.utku.turuncoglu@be.itu.edu.<wbr>tr</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div>
              <div style="font-family:arial,helvetica,sans-serif;font-size:12pt;color:#000000">
                <div>Hi,</div>
                <div><br>
                </div>
                <div>I am trying to perform volume rendering (VR) using
                  multi-block + multi-piece dataset. In this case, the
                  data file has single block that contains multiple
                  piece (created by MPI parallel simulation code) and it
                  is in structured grid. When I try to use volume
                  rendering with raw data, it creates empty output but
                  if I use Merge Block filter before using volume
                  rendering, it works without any problem. So, I have to
                  use <span style="color:#000000;font-family:arial,helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff;display:inline!important;float:none">Merge
                    Blocks to perform VR. </span>At this point, I just
                  wonder that is it typical behaviour of ParaView for <span style="color:#000000;font-family:arial,helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff;display:inline!important;float:none"><span style="color:#000000;font-family:arial,helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff;display:inline!important;float:none"><span style="color:#000000;font-family:arial,helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff;display:inline!important;float:none">multi-block
                        + multi-piece datasets? Is it still possible to
                        perform VR in parallel if I had a multiple core
                        (such as enabling Auto MPI from the settings)?
                        If not is there any way to re-structure the data
                        to perform more efficient rendering?</span></span></span></div>
                <div>
                  <div style="clear:both"><br>
                  </div>
                  <div style="clear:both">Best Regards,</div>
                  <div style="clear:both"><br>
                  </div>
                  <div style="clear:both">--ufuk</div>
                  <div style="clear:both"><br>
                  </div>
                  <div style="clear:both"><br>
                  </div>
                     </div>
              </div>
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            <br>
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