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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Utkarsh,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Depth sort painter representation working ok …. But<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For my first simple implementation I’ll use a D3 filter inside my other source so data is partitioned using the standard filters - and I can access the BSP
cuts etc. Can I pass these cuts down the pipeline as some kind of attached information object and then in the ProcessViewRequest of the representation get them and pass them into the compositor. Using the D3 Cuts might be easier than my Zoltan based bounding
boxes and for version 1, this’ll do.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’m looking at the code now, and can see that vtkOrderedCompositingInfo expects wholeextents and other stuff about spacing etc. I suppose I should simply invent
these numbers based on my whole bounding box and the relative offsets of the individual boxes. Seems a shame to go from the BSP cuts to extents, presumably so that the compositor can then do the reverse. Is this where you said the interface can be improved?
(meaning I can pass the bounds directly and bypass the structured-extents …)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ta<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">JB<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Utkarsh Ayachit [mailto:utkarsh.ayachit@kitware.com]
<br>
<b>Sent:</b> 19 November 2012 16:57<br>
<b>To:</b> Biddiscombe, John A.<br>
<b>Cc:</b> Moreland, Kenneth; paraview-developers@paraview.org; paraview@paraview.org<br>
<b>Subject:</b> Re: [Paraview] [Paraview-developers] (Ordered) Compositing question.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt">John,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Look at vtkStructuredGridVolumeRepresentation, It passes a "ExtentTranslator" to the view. The view uses the extent translator to build the KdTree. That's one of specifying the cuts. You can indeed provide a
custom extent translator or if need be, that API can be extended to pass some other data-structure to extract the relevant information for ordered compositing. <o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">For using opacity with polygonal data, simply go to the lookup table editor dialog and (in the advanced mode) you'll see a checkbox to "Enable Opacity Function". Check that and you can specify the opacity function.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Utkarsh<o:p></o:p></p>
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<o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">On Mon, Nov 19, 2012 at 10:49 AM, Biddiscombe, John A. <<a href="mailto:biddisco@cscs.ch" target="_blank">biddisco@cscs.ch</a>> wrote:<o:p></o:p></p>
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<span style="color:#1F497D">Thanks Ken,</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D">My suspicions are confirmed. I had a poke around with the ordered compositing code (vtkOrderedCompositeDistributor et al) and saw that the BSP cuts from the D3 filter are set to match those from the PKDTree internally. I notice that
in the BSPcuts code it says</span><o:p></o:p></p>
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<span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#608B4E;background:black">// Description:</span><o:p></o:p></p>
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<span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#608B4E;background:black">// Initialize the cuts with arrays of information. This type of</span><o:p></o:p></p>
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<span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#608B4E;background:black">// information would be obtained from a graph partitioning software</span><o:p></o:p></p>
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<span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#608B4E;background:black">// package like Zoltan.</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D">Do you know if there exists such an example. I am infact partitioning the data using Zoltan and have the exact bounds etc of the partitions, so I can work out what to pass into the BSPcuts class and could potentially fool the IceT
composiining into using my partitions. Can you point me to any crucial function that I must call. Is it sufficient to do a SetCuts on the compositing code – which class do I need to take control of?).</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D">I shall create a custom representation to handle the depth sort. I’ve done the same some time ago for the point sprite renderer so I’ll manage that ok, but I’ll need to override the IceT compositing pass too as alluded to above ,
so any pointers welcome. (Could I somehow subclass on of the painters for the IceT pass and set the cuts to what I’ve got, then proceed as usual?)</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D">Thanks</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<span style="color:#1F497D">JB</span><o:p></o:p></p>
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<span style="color:#1F497D"> </span><o:p></o:p></p>
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<b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Moreland, Kenneth [mailto:<a href="mailto:kmorel@sandia.gov" target="_blank">kmorel@sandia.gov</a>]
<br>
<b>Sent:</b> 19 November 2012 16:13<br>
<b>To:</b> Biddiscombe, John A.<br>
<b>Cc:</b> <a href="mailto:paraview-developers@paraview.org" target="_blank">paraview-developers@paraview.org</a>;
<a href="mailto:paraview@paraview.org" target="_blank">paraview@paraview.org</a><br>
<b>Subject:</b> Re: [Paraview-developers] (Ordered) Compositing question.</span><o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:72.0pt">
You are correct in that if you disable ordered composite it will disabled the distribution and the composite ordering. The problem is that the geometry distribution also creates a k-d tree structure that the compositing uses to determine the visibility order.
So it would not be sufficient to simply have geometry that is in non-overlapping pieces. You would also have to provide some meta-structure that could be used to determine an appropriate ordering given a viewpoint. Even if you had that, there is no mechanism
to feed that to the compositor in the view. I can't think of any way of doing that that would not be a huge hack.<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:72.0pt">
As far as I know, there is no support for the DepthSortPolyData filter. You would probably have to create a custom representation to support that. <o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:72.0pt">
I believe the transparent lookup table for poly data is supported in 3.98, but to be honest I have not yet tried it.<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:72.0pt">
-Ken<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:72.0pt">
Sent from my iPad so blame autocorrect.<o:p></o:p></p>
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<br>
On Nov 19, 2012, at 3:46 AM, "Biddiscombe, John A." <<a href="mailto:biddisco@cscs.ch" target="_blank">biddisco@cscs.ch</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:72.0pt">
I have geometry distributed into parallel pieces such that they are non overlapping and therefore compositing should only need to use a back to front sort last frame buffer operation with no redistribution of geometry.<o:p></o:p></p>
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<o:p></o:p></p>
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I’m worried that when I turn on transparency, paraview will try to redistribute my data, even though I have already partitioned it nicely for this. I’d like to use ordered sort last compositing at the top level, and use DepthSortPolyData on each node (no depth
peeling for now) to ensure I get a true image. What isn’t clear to me is if I “disable ordered compositing” if this disables the transfer of geometry AND also disables the ordered compositing necessary for correct transparent blending (I may be confused here
about the blend modes used or the term “ordered compositing” as used in the docs).<o:p></o:p></p>
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<o:p></o:p></p>
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Is there written down anywhere a complete description of the pipelines used by the various rendering modes so that I can be sure the pipeline is doing what I want. I can create a custom representation which does what I want, but it’ll take time and if the existing
mechanism support it, I shouldn’t need to.<o:p></o:p></p>
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<o:p></o:p></p>
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Also, I specifically want to use a transparent lookuptable, does the newer paraview 3.98 have anything to support this. I thought I’d seen a thread about this recently, but cannot find it now.<o:p></o:p></p>
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<o:p></o:p></p>
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In summary : For the rendering, I’d like Ordered sort-last compositing, no geometry redistribution, Depth sort of polygons on each node. Transparent lookup table.<o:p></o:p></p>
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<o:p></o:p></p>
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What settings should I use <span style="font-family:Wingdings">J</span><o:p></o:p></p>
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<o:p></o:p></p>
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Thanks<o:p></o:p></p>
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<o:p></o:p></p>
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JB<o:p></o:p></p>
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<o:p></o:p></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">-- </span><o:p></o:p></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">John Biddiscombe, email:biddisco @.at.@
<a href="http://cscs.ch" target="_blank">cscs.ch</a></span><o:p></o:p></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><a href="http://www.cscs.ch/" target="_blank"><span style="color:windowtext">http://www.cscs.ch/</span></a></span><o:p></o:p></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">CSCS, Swiss National Supercomputing Centre | Tel:
<a href="tel:%2B41%20%2891%29%20610.82.07" target="_blank">+41 (91) 610.82.07</a></span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:"Courier New"">Via Trevano 131, 6900 Lugano</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New"">, Switzerland | Fax:
<a href="tel:%2B41%20%2891%29%20610.82.82" target="_blank">+41 (91) 610.82.82</a></span><o:p></o:p></p>
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<o:p></o:p></p>
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