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<p class="MsoNormal">Recently (3.10 onwards I think) a new filter was added to paraview which does some ‘conversion’ of inputs so that they can operate with filters that they would otherwise not do so.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am finding that some filters of mine which produce vtkStructuredGrid output, produce no visible output inn paraview and after some painful debugging have tracked it down to vtkPVPostFilter, specifically<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When vtkPVPostFilter is passind datasets directly from input to output without taking any action, it does a simple<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New"">
<span style="color:green">output</span>-><span style="color:green">ShallowCopy</span>(<span style="color:green">input</span>);<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New"">I had to add
<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New""> <span style="color:green">output</span>-><span style="color:green">CopyInformation</span>(<span style="color:green">input</span>);<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New"">in order for my datasets to become visible in the PV GUI.<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New""><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New"">I believe that this is a bug in pvPostFilter, and I suspect it is new because the executive used to do a lot of the information copying without filters
needing to do it.<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New""><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New"">The odd thing is that some vtkStructuredGrid sources were still working without the extra information copy and so I’m not 100% sure it’s a bug (or some
deficiency in the datasets).<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New""><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New"">Can one of the kitware chaps comment on why I might have trouble with some filters, but not with others. The key part seems to be that the Extent information
needs to be set in the information as well as the dataset and when doing a copyStructure, it isn’t passed through.<o:p></o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New""><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:12.0pt;font-family:"Courier New"">JB<o:p></o:p></span></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Courier New"">--
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Courier New"">John Biddiscombe, email:biddisco @ cscs.ch<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Courier New""><a href="http://www.cscs.ch/"><span style="color:blue">http://www.cscs.ch/</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Courier New"">CSCS, Swiss National Supercomputing Centre | Tel: +41 (91) 610.82.07<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Courier New"">Via Cantonale, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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