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<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>Hi
Ken,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>“The
mesh quality filter will be run multiple times on multiblock data (once per
block), but I assume that is not the case for you as volume rendering is not
available on data with more than one block.”<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>I
think this sentence sums up my problem: the unstructured grid does indeed consist
of multiblock data.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>Ok
thanks so much for your help. I will look for a different approach to what I am
trying to do.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>Thanks
for your time.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>Nat.</span></font><font
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color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span lang=EN-US
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<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span lang=EN-US
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'> <o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Dr.
Nathanael Inkson,</span></font></b><b><font size=2 color=gray face=Verdana><span
lang=EN-US style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
Moreland, Kenneth [mailto:kmorel@sandia.gov] <br>
<b><span style='font-weight:bold'>Sent:</span></b> 02 September 2008 18:41<br>
<b><span style='font-weight:bold'>To:</span></b> Nathanael Inkson<br>
<b><span style='font-weight:bold'>Cc:</span></b> Simon Hubbard;
paraview@paraview.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: Strange behaviour
with large datasets</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>I am
a bit confused. The initial question sounded like a volume rendering
problem; you could not see the result of the mesh quality filter very
well. Is the problem you are reporting that the output of the mesh
quality filter is incorrect? Do the ranges look wrong in the information
tab? Does the threshold filter not extract cells you expect to be of poor
quality?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>Does
your modified mesh quality filter behave differently than the one that comes
with ParaView? The pipeline should not be updating your filter unless it
needs to refresh the calculation. The mesh quality filter will be run
multiple times on multiblock data (once per block), but I assume that is not
the case for you as volume rendering is not available on data with more than
one block. The cell count might be off because you are running in
parallel. Each process will have a partition of the whole mesh, so the
cell count will be smaller unless you are getting the global multiprocess
controller and adding up all the cells.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>If
the pipeline is inappropriately calling your filter multiple times, it might be
that your filter is calling its own Modified method (usually indirectly
through, for example, a call to one of the Set* macros). You can check
for that by making sure that the MTime ivar does not change while invoking
RequestData or any other ProcessRequests method.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>-Ken<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
Nathanael Inkson [mailto:Nathanael.Inkson@digitalflowsolutions.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 02, 2008
11:15 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Moreland, Kenneth<br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">simon.hubbard@digitalflowsolutions.com</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: Strange behaviour
with large datasets</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dear Ken,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> Thanks for your answer
but I am not sure that this is the reason as I have other fields which have
large values. If I count the number of cells in one pass through vtkMeshQuality
and output to a file, I find that the answer is far less than the actual number
of cells in the mesh. I have a gut feeling that because the mesh is so big that
the MeshQuality filter is entered several times as it updates the progress bar,
wouldn’t that mean that the newly created quality arrays are overwritten
each time the filter is entered? I’m not too sure about how the filters
actually work.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>How is this prevented?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Nat.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span lang=EN-US
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'>Best
Regards<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span lang=EN-US
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'> <o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Dr.
Nathanael Inkson,</span></font></b><b><font size=2 color=gray face=Verdana><span
lang=EN-US style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:
bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span lang=EN-US
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'> <o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Computational
Fluid Dynamics Developer,</span></font></b><b><font size=2 color=gray
face=Verdana><span lang=EN-US style='font-size:10.0pt;font-family:Verdana;
color:gray;font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Digital
Flow Solutions,</span></font></b><b><font size=2 color=gray face=Verdana><span
lang=EN-US style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:
bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
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size=1 color=gray face=Verdana><span lang=EN-US style='font-size:9.0pt;
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
Moreland, Kenneth [mailto:kmorel@sandia.gov] <br>
<b><span style='font-weight:bold'>Sent:</span></b> 02 September 2008 14:58<br>
<b><span style='font-weight:bold'>To:</span></b> Nathanael Inkson; <st1:PersonName
w:st="on">paraview@paraview.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: Strange behaviour
with large datasets</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>If
your mesh is typical, then probably most of the cells are of good quality, and
there are a handful of cells of bad quality. Thus, when volume rendering
most of the cells will be invisible and that handful of cells will have some
opacity.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>The
probable reason that you can see them in a small mesh and not a large one is
that the cells are spatially much smaller (with respect to the entire mesh) for
the large mesh. In correct volume rendering, a material of a constant
density will have smaller opacity the thinner it gets. Your cells are
probably so small that there is not enough accumulation to actually see them.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>You
can adjust for the small scale of the cells by adjusting the
“Scale” parameter in the Color Scale Editor dialog box. That
parameter is actually a unit length specification for the opacity parameters
given. Setting it to about cell length divided by 10 should give you
decent results. However, an easier and probably more effective approach
would be to bag the volume rendering and use the threshold filter to extract
the cells of interest (in this case, the bad ones).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'>-Ken<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
paraview-bounces@paraview.org [mailto:paraview-bounces@paraview.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Nathanael Inkson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 02, 2008
7:31 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">paraview@paraview.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [Paraview] Strange
behaviour with large datasets</span></font><span lang=EN-US><o:p></o:p></span></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dear Paraview people,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
I am working with Paraview with very large datasets (around 40Gb). I have
written a filter derived from MeshQuality which doesn’t seem to display
the returned data arrays correctly. I checked with the same mesh and the
MeshQuality filter. The same thing happens: I put the output on volume
rendering to look at the quality field and the whole dataset is invisible. I
have tried rescaling the range but to know avail. Is this a known problem?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Any advice? With smaller meshes the problem disappears and
the quality field is visible with volume rendering.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span lang=EN-US
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'>Best
Regards<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span lang=EN-US
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'> <o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Dr.
Nathanael Inkson,</span></font></b><b><font size=2 color=gray face=Verdana><span
lang=EN-US style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:
bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span lang=EN-US
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'> <o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Computational
Fluid Dynamics Developer,</span></font></b><b><font size=2 color=gray
face=Verdana><span lang=EN-US style='font-size:10.0pt;font-family:Verdana;
color:gray;font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Digital
Flow Solutions,</span></font></b><b><font size=2 color=gray face=Verdana><span
lang=EN-US style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:
bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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size=3 face="Times New Roman"><span style='font-size:12.0pt'> <img
border=0 width=289 height=46 id="_x0000_i1025"
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><strong><b><font
size=1 color=gray face=Verdana><span lang=EN-US style='font-size:9.0pt;
font-family:Verdana;color:gray'>mob: + 44 7872010167</span></font></b></strong><strong><b><font
size=1 color=gray face=Verdana><span lang=EN-US style='font-size:7.5pt;
font-family:Verdana;color:gray'><o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><strong><b><font
size=1 color=gray face=Verdana><span lang=EN-US style='font-size:9.0pt;
font-family:Verdana;color:gray'>web: wirthresearch.com</span></font></b></strong><font
size=1><span style='font-size:9.0pt'><o:p></o:p></span></font></p>
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12.0pt'> <o:p></o:p></span></font></p>
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