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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Stephane,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thank you for your replay with an overview of the advanced rendering
opportunities in VTK ! I will look at the ParaView-Example for the hidden lines
removal. But the multipass-framework is still of interest for me because I want
to use more sophisticated multipass-rendering techniques later. Ok, but for now
I take a look insight painters. :-)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Best regards,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Rocco<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>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><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"'> Stephane PLOIX
[mailto:stephane.ploix@edf.fr] <br>
<b>Sent:</b> Tuesday, November 24, 2009 11:58 AM<br>
<b>To:</b> post@rocco-gasteiger.de<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Subject:</b> RE [vtkusers] Request to VTK Multi-Pass Rendering<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hi Rocco,</span>
<br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Here is a
general picture of the different ways you can implement advanced rendering
effects in VTK : </span><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>*shaders : each
vtkProp can have a shader, this is mostly used in single pass algorithms</span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>*painters : you
can implement a per-prop multipass algorithm in a painter, as is done in the
plugin example in ParaView/Example/Plugins/HiddenLinesRemoval which does
exactly what you need.</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>*renderpass :
this framework is intended for algorithm that need global information of all
props : you can implement post-processing algorithms like screen-space ambient
occlusion or edge-detection filters, and algorithms that require several passes
of all the props, like shadow mapping.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Best,</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Stephane<br>
</span><br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>post@rocco-gasteiger.de</span></b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'> </span><br>
<span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Envoyé par :
vtkusers-bounces@vtk.org</span> <o:p></o:p></p>
<p><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>23/11/2009
10:51</span> <o:p></o:p></p>
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<p class=MsoNormal align=right style='text-align:right'><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'>A</span><o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>vtkusers@vtk.org</span>
<o:p></o:p></p>
</td>
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<p class=MsoNormal align=right style='text-align:right'><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'>cc</span><o:p></o:p></p>
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<p class=MsoNormal align=right style='text-align:right'><span
style='font-size:7.5pt;font-family:"Arial","sans-serif"'>Objet</span><o:p></o:p></p>
</td>
<td valign=top style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'>[vtkusers]
Request to VTK Multi-Pass Rendering</span><o:p></o:p></p>
</td>
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<p class=MsoNormal><o:p> </o:p></p>
<table class=MsoNormalTable border=0 cellpadding=0>
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<td valign=top style='padding:.75pt .75pt .75pt .75pt'></td>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<br>
<br>
<span style='font-family:"Calibri","sans-serif"'>Dear VTK users,</span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>I want to use the new
mulit-pass framework in VTK implemented by François Bertel. At first, many
thanks François for implementing this framework! I need some multipass
rendering for my research project and I think you have provided a very good
base for start-up with this. </span><br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>For a better understanding how
it works, I tried to adopt a native multi-pass OpenGL example in VTK, with help
of the given framework. In doing so I oriented me at the given examples on the
according VTK Wiki sites. Unfortunately, I did not get the same result in VTK
like in OpenGL. I think I miss some important facts of understanding the VTK
rendering pipeline. So I hope somebody (maybe François directly) can help me to
have a better understanding of how the framework works. Here comes what I
really do:</span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>In OpenGL I implemented an
algorithm for hidden line removing (It is based on the paper of Jarek R.
Rossignac and Maarten van Emerik: Hidden contours on a frame-buffer (1992) ).
Here is a snippet of my OpenGL code, where I have to render my geometry two
times (2-passes).</span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>glClear (GL_COLOR_BUFFER_BIT |
GL_DEPTH_BUFFER_BIT);</span> <br>
<span style='font-family:"Calibri","sans-serif"'>glEnable(GL_DEPTH_TEST);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>glColor3f(0,0,0);</span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>// Settings for first pass</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>glColorMask(GL_FALSE,
GL_FALSE, GL_FALSE,GL_FALSE);</span> <br>
<span style='font-family:"Calibri","sans-serif"'>glPolygonMode(GL_FRONT_AND_BACK,
GL_FILL);</span> <br>
<span style='font-family:"Calibri","sans-serif"'>drawMyGeometryWithSolidFaces();</span>
<br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>// Settings for second pass</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>glColorMask(GL_TRUE, GL_TRUE,
GL_TRUE,GL_TRUE);</span> <br>
<span style='font-family:"Calibri","sans-serif"'>glPolygonMode(GL_FRONT_AND_BACK,
GL_LINE);</span> <br>
<span style='font-family:"Calibri","sans-serif"'>glEnable(GL_POLYGON_OFFSET_LINE);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>glPolygonOffset(-1.0,1.0);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>drawMyGeometryWithSolidFaces();</span>
<br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>// Reset polygon offsest</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>glDisable(GL_POLYGON_OFFSET_FILL);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>In VTK I derived a class
“vtkHiddenLineDesignerPass” from “vtkRenderPass” and tried to implement the
same OpenGL steps. The result is, that still all lines are rendered, also the
hidden lines. I use the following lines of code snippets in the “Render(const
vtkRenderState *s)”-function to adopt the OpenGL-code with VTK datastructures
and calls:</span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>//** Getting necessary
VTK-objects to turn on/off some OpenGL-states.**/</span> <br>
<span style='font-family:"Calibri","sans-serif"'>vtkOpenGLRenderer *r=static_cast<vtkOpenGLRenderer
*>(s->GetRenderer());</span> <br>
<span style='font-family:"Calibri","sans-serif"'>vtkActor *actor =
r->GetActors()->GetLastActor();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>vtkPolyDataMapper *actorMapper
= static_cast<vtkPolyDataMapper*>(actor->GetMapper());</span> <br>
<span style='font-family:"Calibri","sans-serif"'>vtkProperty *actorProp =
actor->GetProperty();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>
</span><br>
<span style='font-family:"Calibri","sans-serif"'>// Settings for the first pass
//</span> <br>
<span style='font-family:"Calibri","sans-serif"'>glClear (GL_COLOR_BUFFER_BIT |
GL_DEPTH_BUFFER_BIT);</span> <br>
<span style='font-family:"Calibri","sans-serif"'>glColorMask(GL_FALSE,
GL_FALSE, GL_FALSE,GL_FALSE);</span> <br>
<span style='font-family:"Calibri","sans-serif"'>actorProp->SetRepresentationToSurface();
//** For glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);**//</span> <br>
<span style='font-family:"Calibri","sans-serif"'>this->DelegatePass->Render(s);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>this->NumberOfRenderedProps
+= this->DelegatePass->GetNumberOfRenderedProps();</span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>// Settings for the second
pass //</span> <br>
<span style='font-family:"Calibri","sans-serif"'>actorProp->SetDiffuseColor(0,0,0);
//** For glColor3f(0,0,0); **//</span> <br>
<span style='font-family:"Calibri","sans-serif"'>glColorMask(GL_TRUE, GL_TRUE,
GL_TRUE,GL_TRUE);</span> <br>
<span style='font-family:"Calibri","sans-serif"'>actorProp->SetRepresentationToWireframe();
//** For glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); **//</span> <br>
<span style='font-family:"Calibri","sans-serif"'>actorMapper->SetResolveCoincidentTopology(1);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>actorMapper->SetResolveCoincidentTopologyToPolygonOffset();</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>actorMapper->SetResolveCoincidentTopologyPolygonOffsetFaces(0);
//** For glEnable(GL_POLYGON_OFFSET_LINE);**//</span> <br>
<span style='font-family:"Calibri","sans-serif"'>actorMapper->SetResolveCoincidentTopologyPolygonOffsetParameters(-1.0,1);
//** For glPolygonOffset(-1.0,1.0);**//</span> <br>
<span style='font-family:"Calibri","sans-serif"'>
</span><br>
<span style='font-family:"Calibri","sans-serif"'>this->DelegatePass->Render(s);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>this->NumberOfRenderedProps
+= this->DelegatePass->GetNumberOfRenderedProps();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>actorMapper->SetResolveCoincidentTopology(0);
//** For glDisable(GL_POLYGON_OFFSET_FILL);**//</span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>In my VTK-class, where I use
this rendering pass, I process following rendering pipeline:</span> <br>
<span style='font-family:"Calibri","sans-serif"'>// The elementary passes.</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>vtkLightsPass
*lights=vtkLightsPass::New();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>vtkDefaultPass
*defaultPass=vtkDefaultPass::New();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>
</span><br>
<span style='font-family:"Calibri","sans-serif"'>// Put them in a sequence.</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>vtkRenderPassCollection
*passes=vtkRenderPassCollection::New();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>passes->AddItem(lights);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>passes->AddItem(defaultPass);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>vtkSequencePass
*seq=vtkSequencePass::New();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>seq->SetPasses(passes);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>// Make the sequence the
delegate of a camera pass.</span> <br>
<span style='font-family:"Calibri","sans-serif"'>vtkCameraPass
*cameraP=vtkCameraPass::New();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>cameraP->SetDelegatePass(seq);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>// Create the hidden line
removing pass and attach the camera pass as its delegate</span> <br>
<span style='font-family:"Calibri","sans-serif"'>vtkHiddenLineDesignerPass
*myPass=vtkHiddenLineDesignerPass::New();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>myPass
->SetDelegatePass(cameraP);</span> <br>
<span style='font-family:"Calibri","sans-serif"'>
</span><br>
<span style='font-family:"Calibri","sans-serif"'>vtkRenderer* renderer01=
vtkRenderer::New();</span> <br>
<span style='font-family:"Calibri","sans-serif"'>renderer01->SetPass(myPass);</span>
<br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>Especially, my
misunderstanding relies on when to use native OpenGL-code and when using
VTK-calls. I tried some variations of the code, presented above but
without success. It would be very helpful if someone can give me some hints.</span>
<br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'>Many thanks in advance,</span>
<br>
<span style='font-family:"Calibri","sans-serif"'>Rocco Gasteiger </span><br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Courier New"'>--------------------------------------------------</span>
<br>
<span style='font-family:"Courier New"'>Dipl.-Ing. Rocco Gasteiger</span> <br>
<span style='font-family:"Courier New"'>Otto-von-Guericke University<br>
Faculty of Computer Science<br>
Department of Simulation and Graphics<br>
Universitätsplatz 2, 39106 Magdeburg, Germany</span> <br>
<span style='font-family:"Courier New"'> </span> <br>
<span style='font-family:"Courier New"'>Office: G29-223</span> <br>
<span style='font-family:"Courier New"'>Phone: +49 391 67 127 59<br>
Fax: +49 391 67 111 64</span> <br>
<span style='font-family:"Courier New"'>Website:
http://wwwisg.cs.uni-magdeburg.de/cvcms/ </span><br>
<span style='font-family:"Courier New"'>--------------------------------------------------</span>
<br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span> <br>
<span style='font-family:"Calibri","sans-serif"'> </span><tt><span
style='font-size:10.0pt'>_______________________________________________</span></tt><span
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