<div dir="ltr"><div>Hi Dennis,</div><div><br></div>Here is an example that works in 4.3:<div><br></div><div><div>from vtk.numpy_interface import dataset_adapter as dsa</div><div>iterator = dsa.MultiCompositeDataIterator([inputs[0], output])</div><div>for iblock, oblock in iterator:</div><div> oblock.PointData.append(iblock.PointData['DISPL'], "DISPL")</div></div><div><br></div><div>A few points:</div><div>* MultiCompositeDataIterator() allows you to traverse the input and output datasets together so you get matching datasets</div><div>* iblock and oblock correspond to input and output blocks</div><div>* For the API for the iblock and oblock objects, see the User's Guide or numerous blogs that I wrote on the topic under <a href="http://www.kitware.com/blog">www.kitware.com/blog</a></div><div>* vtkDataSet API is also available through those objects so you can call things like GetNumberOfCells(), GetNumberOfPoints() etc.</div><div><br></div><div>Best,</div><div>-berk</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Apr 29, 2015 at 11:01 AM, Dennis Conklin <span dir="ltr"><<a href="mailto:dennis_conklin@goodyear.com" target="_blank">dennis_conklin@goodyear.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Berk,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Thanks for your reply.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I am using Paraview 4.3, so hopefully that has the improvements you mentioned.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I guess if I could figure out what objects are used for Blocks in side the Programmable filter I could do more on my own, but it’s clear they are different from
in a python script, but still not clear what they are.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">So a typical application would be a special version of point data to cell data.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I have some node variables. I want to find all the nodes attached to each element, do some calculations on those node variables to generate a new element
variable. So basically like<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Loop over blocks<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> Loop over elements in block<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> Find all nodes connected to element<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> Perform calculations based on node variables<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> Assign new element variable(s) based on calculations<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Thanks for any insight – Alan at Sandia has suggested I check the latest user guide, and I will, but I haven’t seen a good element example for the Programmable
filter yet – I don’t have any problem doing nodal manipulations, but I have a good example of that.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Dennis<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Berk Geveci [mailto:<a href="mailto:berk.geveci@kitware.com" target="_blank">berk.geveci@kitware.com</a>]
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<b>Sent:</b> Wednesday, April 29, 2015 10:29 AM<br>
<b>To:</b> Scott, W Alan<br>
<b>Cc:</b> Dennis Conklin; <a href="mailto:paraview@paraview.org" target="_blank">paraview@paraview.org</a><br>
<b>Subject:</b> Re: [Paraview] [EXTERNAL] Idiot's Guide to Programmable Filter<u></u><u></u></span></p><div><div class="h5">
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<p class="MsoNormal">Hey Dennis,<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Which version of ParaView are you using? We have made some significant improvements to the way we handle multi-block datasets (which Exodus produces) in the latest version.<u></u><u></u></p>
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<p class="MsoNormal">The interface in the Programmable Filter is somewhat different than what you would have in a ParaView Python script. This is because you actually have access to the full data and the objects in there are of different types.<u></u><u></u></p>
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<p class="MsoNormal">If you give me some examples of what you are trying to do in the programmable filter, I can provide code that demonstrates the use of the API in the programmable filter.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Best,<u></u><u></u></p>
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<p class="MsoNormal">-berk<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Tue, Apr 28, 2015 at 10:32 PM, Scott, W Alan <<a href="mailto:wascott@sandia.gov" target="_blank">wascott@sandia.gov</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span style="color:#1f497d">Dennis,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">The Python/ Programmable filter is a black box to me (i.e., I won’t be much additional help). However, the place i would start would be the new, super-duper
ParaView Guide. Kitware – and especially Utkarsh – have done a great job on it.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Rather than giving the link, here is how to find it. It is sold in paper form on Amazon, and also is available as a .pdf for free (lacking 3 chapters,
not related to the python filter). </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"><a href="http://paraview.org/" target="_blank">paraview.org/</a> Resources/ ParaView Guide. This includes the link to the .pdf. You are interested
in (at least) chapter 13. It is listed under master section II, Reference Manual.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Alan</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
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<b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> ParaView [mailto:<a href="mailto:paraview-bounces@paraview.org" target="_blank">paraview-bounces@paraview.org</a>]
<b>On Behalf Of </b>Dennis Conklin<br>
<b>Sent:</b> Tuesday, April 28, 2015 11:11 AM<br>
<b>To:</b> <a href="mailto:paraview@paraview.org" target="_blank">paraview@paraview.org</a><br>
<b>Subject:</b> [EXTERNAL] [Paraview] Idiot's Guide to Programmable Filter</span><u></u><u></u></p>
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<u></u><u></u></p>
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All,<u></u><u></u></p>
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<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
I’m a little confused by what objects are inside a programmable filter. I have a multi-block EXODUS dataset. When I read this in it is a Exodus2Reader object (sp?) and I can access the blocks, pointdata, celldata, etc in a python script.<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
Once I get inside the Programmable filter, the blocks of the input[] seem to have different member functions than they did in a Python script. So I can’t figure out how to get connectivity, number of cells in a block, generate new cell variables, etc.
<u></u><u></u></p>
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<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
So, if I’m in a Programmable Filter, what object do I look at in either the Paraview or VTK class libraries to understand what the properties of the block are?<u></u><u></u></p>
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<u></u><u></u></p>
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Thanks very much for any insight you can give.<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
<u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
Dennis<u></u><u></u></p>
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