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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Stephane,<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 option 1 :
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Instead of using special keys, I suspect I can just hijack the render transparent geometry pass and do my custom render in there (s my stuff is ransparent and
I only want to mix with opaque stuff) – with a pass for compositing -- and then doing the RGB correction on process 0. Then just make sure that the non zero process Id’s don’t composite any transparent stuff back to the master image and allow process 0 to
contribute the correct composited and corrected image.<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’ll explore this. thanks for the pointers to both you and Ken. These passes and delegates and wotnot are all a bit confusing when you haven’t used them much.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">JB<o:p></o:p></span></p>
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<p class="MsoNormal"><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""> Stephane PLOIX [mailto:stephane.ploix@edf.fr]
<br>
<b>Sent:</b> 26 September 2011 17:13<br>
<b>To:</b> Biddiscombe, John A.<br>
<b>Cc:</b> kmorel@sandia.gov; paraview@paraview.org<br>
<b>Subject:</b> RE: [Paraview] non ordered composite distributor and IceT<o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">John,</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">That all sounds correct. Option 2 might get a little dodgy because the IceT parallel render manager does all sorts of funny things with the renderer and render window buffers to handle tile
displays. There will also be some oddness with an actor compositing an image that gets pasted to a framebuffer that gets composited again.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">I think Option 1 (or some variant of it) would be easier to implement even if it does break encapsulation.</span>
<br>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Ken knows much more than me about the Icet compositor and tiled display things, so there might be issues that I am not aware of here.
</span><br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Pasting the image to a framebuffer that gets composited again should not be an issue (the LIC mapper does it, even though it does nothing about parallel composition)</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">If you do not want to use a shader, then you need either to use the opengl fixed pipeline (I do not know the correction that you need to do, but that might be possible), or copy the pixels back
on your RAM, do the work on the CPU and go back to the VRAM... I fear you will get horrible performance that way! The shaders should be quite easy to write, the imageProcessingPass does most of the dirty work for you (setup the framebuffer, render a quad...)<br>
<br>
Best,</span> <br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Stephane</span> <o:p>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#FF8100">Stephane PLOIX<br>
Chef de groupe</span></b><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#0062E1"><br>
EDF – R&D / SINETICS<br>
Réalité virtuelle et visualisation scientifique<br>
1, av du General de Gaulle<br>
92140 Clamart<br>
</span><br>
<b><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#0062E1">stephane.ploix@edf.fr</span></b>
<br>
<span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#0062E1">Tél. : 01 47 65 51 10</span>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#0062E1">Un geste simple pour l'environnement, n'imprimez ce message que si vous en avez l'utilité.</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">biddisco@cscs.ch</span></b><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">
</span><o:p></o:p></p>
<p><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">26/09/2011 16:55</span>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">stephane.ploix@edf.fr</span>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">kmorel@sandia.gov, paraview@paraview.org</span>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif"">RE: [Paraview] non ordered composite distributor and IceT</span><o:p></o:p></p>
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<span style="font-family:"Calibri","sans-serif";color:#004080">Stephane</span> <br>
<span style="font-family:"Calibri","sans-serif";color:#004080"> </span> <br>
<span style="font-family:"Calibri","sans-serif";color:#004080">I like your 2. </span>
<br>
<span style="font-family:"Calibri","sans-serif";color:#004080"> </span> <br>
<span style="font-family:"Calibri","sans-serif";color:#004080">As a starting point to see how it all fits together, I decided to create a renderview cloned from the renderviews plugin which did the RGB correction in a special render pass. The examples use shaders
to apply the ImageProcessingPass, but I would like a standard imagefilter to accomplish it.
</span><br>
<span style="font-family:"Calibri","sans-serif";color:#004080"> </span> <br>
<span style="font-family:"Calibri","sans-serif";color:#004080">I am not forced to use a shader am I? (I didn’t look too deeply yet, but it seems like the image processing pass receives an FBO and from that I can access the pixels using the imageimport and do
what’s needed, but it looks a bit messy – is there a simpler way?).</span> <br>
<span style="font-family:"Calibri","sans-serif";color:#004080"> </span> <br>
<span style="font-family:"Calibri","sans-serif";color:#004080">thanks</span> <br>
<span style="font-family:"Calibri","sans-serif";color:#004080"> </span> <br>
<span style="font-family:"Calibri","sans-serif";color:#004080">JB</span> <br>
<span style="font-family:"Calibri","sans-serif";color:#004080"> </span> <br>
<b><span style="font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-family:"Tahoma","sans-serif""> Stephane PLOIX [mailto:stephane.ploix@edf.fr]
<b><br>
Sent:</b> 26 September 2011 15:41<b><br>
To:</b> Biddiscombe, John A.<b><br>
Cc:</b> kmorel@sandia.gov; paraview@paraview.org<b><br>
Subject:</b> Re: [Paraview] non ordered composite distributor and IceT</span> <br>
<br>
<span style="font-family:"Arial","sans-serif""><br>
Hi John,</span> <br>
<span style="font-family:"Arial","sans-serif""><br>
I see two solutions to your pb : <br>
1/ you can setup special keys to tell the renderpass if a given actor should be rendered or not by this pass. You can then branch your renderpasses on two paths, one that does your special compositing and post-processing on the actors that you flagged with
the special key, one that does traditionnal rendering for all other actors, and you then need to compose the 2 resulting images.</span>
<br>
<span style="font-family:"Arial","sans-serif""><br>
2/ You could setup an internal renderpass on your mapper that uses the IceT compositing mechanism, apply your post-processing internally, then render the result of this compositing on the current framebuffer.</span>
<br>
<span style="font-family:"Arial","sans-serif""><br>
Option 2 should be better since your render effect seems to be actor-centric.<br>
Best,</span> <span style="font-family:"Arial","sans-serif""><br>
Stephane</span> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial","sans-serif";color:#FF8100">Stephane PLOIX<br>
Chef de groupe</span></b><span style="font-family:"Arial","sans-serif";color:#0062E1"><br>
EDF – R&D / SINETICS<br>
Réalité virtuelle et visualisation scientifique<br>
1, av du General de Gaulle<br>
92140 Clamart</span><br>
<b><span style="font-family:"Arial","sans-serif";color:#0062E1"><br>
stephane.ploix@edf.fr</span></b> <span style="font-family:"Arial","sans-serif";color:#0062E1">
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Tél. : 01 47 65 51 10</span> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#0062E1">Un geste simple pour l'environnement, n'imprimez ce message que si vous en avez l'utilité.</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial","sans-serif"">biddisco@cscs.ch</span></b><span style="font-family:"Arial","sans-serif"">
<br>
Envoyé par : paraview-bounces@paraview.org</span> <o:p></o:p></p>
<p><span style="font-family:"Arial","sans-serif"">25/09/2011 22:15</span> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">kmorel@sandia.gov, paraview@paraview.org</span>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Re: [Paraview] non ordered composite distributor and IceT</span><o:p></o:p></p>
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<span style="font-family:"Calibri","sans-serif";color:#004080"><br>
Ken</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
After looking through the sources a little more, I see that the example plugin RenderPassViews does something similar to what I’m after. It add a render pass at the end which applies an edge detection algorithm, This happens after compositing – which is what
I need.</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
However, this renderpass applies to all mappers/actors in the renderer/view, so if I used this strategy, then my post processing RGB correction from the mapper+compositing would happen to all actors, and this is no good.</span>
<span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
So it looks like what I want to do won’t be possible, because there’d be no way to composite one actor individually and then blend with the others later.</span>
<span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
Since you don’t know what it is I’m trying to do, it is probably unclear, but in short, the mapper renders the data on each process, and after all RGB images are summed in the compositing phase a correction must be applied to the RGB values (but its not commutative,
so can’t be applied on each process individually). (unless I modify the algorithm which might be possible, I’ll check on this)</span>
<span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
One approach might be to add a separate pass which renders only the special geometry, but I suspect this will be too hard because the blending phases would all need to be tweaked so that the compositing happened twice (?) – once for the special stuff, once
for everything else.</span> <span style="font-family:"Calibri","sans-serif";color:#004080">
<br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
Can you tell if I’ve I understood things properly from my suppositions above, and if so, any other tips I might look into before I consider algorithmic changes.</span>
<span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
Thanks</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
JB</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <span style="font-family:"Calibri","sans-serif";color:#004080"><br>
</span> <b><span style="font-family:"Tahoma","sans-serif""><br>
From:</span></b><span style="font-family:"Tahoma","sans-serif""> Moreland, Kenneth [mailto:kmorel@sandia.gov]
<b><br>
Sent:</b> 21 September 2011 22:30<b><br>
To:</b> Biddiscombe, John A.; paraview@paraview.org<b><br>
Subject:</b> Re: [Paraview] non ordered composite distributor and IceT</span> <span style="font-family:"Calibri","sans-serif"">
<br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
John,</span> <span style="font-family:"Calibri","sans-serif""><br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
If you look more closely, you should see that the data is only distributed when transparency is on. If everything is opaque, then everything stays where it is. If I remember correctly, there is a flag in vtkOrderedCompositeDistributor that turns it to a pass-through
filter. It's implemented like this because it's more convenient than changing around the internal pipeline. If you never have to do ordered compositing, you could just remove this filter. Likewise, you can set the parallel render manager to do non-ordered
compositing and just forget about the parallel k-d tree.</span> <span style="font-family:"Calibri","sans-serif"">
<br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
-Ken</span> <span style="font-family:"Calibri","sans-serif""><br>
</span> <b><span style="font-family:"Calibri","sans-serif""><br>
From: </span></b><span style="font-family:"Calibri","sans-serif"">"Biddiscombe, John A." <</span><a href="mailto:biddisco@cscs.ch"><span style="font-family:"Calibri","sans-serif"">biddisco@cscs.ch</span></a><span style="font-family:"Calibri","sans-serif"">><b><br>
Date: </b>Wed, 21 Sep 2011 19:55:19 +0000<b><br>
To: </b>"</span><a href="mailto:paraview@paraview.org"><span style="font-family:"Calibri","sans-serif"">paraview@paraview.org</span></a><span style="font-family:"Calibri","sans-serif"">" <</span><a href="mailto:paraview@paraview.org"><span style="font-family:"Calibri","sans-serif"">paraview@paraview.org</span></a><span style="font-family:"Calibri","sans-serif"">><b><br>
Subject: </b>[Paraview] non ordered composite distributor and IceT</span> <span style="font-family:"Calibri","sans-serif"">
<br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
Can anyone point me to an example of a representarion which interacts with IceT in any n on standard way. Geometry and UGVolume Representations use a vtkOrderedCompositeDistributor and then IceT takes over.</span>
<span style="font-family:"Calibri","sans-serif""><br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
I’d like toe skip the vtkOrderedCompositeDistributor (which is ok), but I’m not sure how to interact with IceT and see how it doe the image summation etc.</span>
<span style="font-family:"Calibri","sans-serif""><br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
Are there any odd representations out there I can use as examples?</span> <span style="font-family:"Calibri","sans-serif"">
<br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
Thanks</span> <span style="font-family:"Calibri","sans-serif""><br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
JB</span> <span style="font-family:"Calibri","sans-serif""><br>
</span> <span style="font-family:"Courier New""><br>
-- <br>
John Biddiscombe, email:biddisco @ cscs.ch</span> <u><span style="color:blue"><br>
</span></u><a href="http://www.cscs.ch/"><span style="font-family:"Courier New"">http://www.cscs.ch/</span></a>
<span style="font-family:"Courier New""><br>
CSCS, Swiss National Supercomputing Centre | Tel: +41 (91) 610.82.07</span> <span style="font-family:"Courier New"">
<br>
Via Cantonale, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82</span> <span style="font-family:"Calibri","sans-serif"">
<br>
</span> <span style="font-family:"Calibri","sans-serif""><br>
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