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<div class=Section1>
<p class=MsoNormal><span lang=EN-US>Dear vtk-Community,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>For a multi-pass rendering I use my own
rendering pass “MyMultiPass” derived from vtkRenderingPass. Within
the rendering I render several opaque and translucent geometries which have an
individual vtkInformation-Key. These keys are used to set a vtkRenderState
“MyRenderingState” in “MyMultiPass”. After each setting
I perform a rendering (calling “MyMultiPass->DelegatePass->Render(MyRenderingState)”)
to render a specific geometry indicated by the key I set before into a texture.
For each geometry I apply a separate shader. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>The delegate pass consists of a
vtkCameraPass with following sub-sequences (in that order) <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>vtkCameraPass<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
lang=EN-US><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>vtkSequencePass<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;
mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US
style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US>vtkLightsPass<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;
mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US
style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US>vtkOpaquePass<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;
mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US
style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US>vtkDepthPeelingPass with vtkTranslucentPass as translution pass
(depth peeling is supported!)<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;
mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US
style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US>vtkOverlayPass<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Now, my problem is a wrong rendering of the
opaque geometry which results in a black texture image. If I replace the
vtkDepthPeelingPass with a common vtkTranslucentPass then all renderings are
correct. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>With my debugger I stepped through the
corresponding vtk-classes and callings. I noticed following behavior.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
lang=EN-US><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>In
vtkSequencePass::Render(const vtkRenderState *s) each sub-pass performs its
rendering (if an appropriate vtkProp is available)<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
lang=EN-US><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>If the vtkDepthPeelingPass is
processed than a test is performed to check for translucent geometry. Because I
have such objects added to my renderer this test results in true<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
lang=EN-US><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>Afterwards, this pass performs
several render peels (each peel with a vtkTranslucentPass) for each geometry
which has the desired key </span><span lang=EN-US style='font-family:Wingdings'>è</span><span
lang=EN-US> the opaque geometry is also rendered with several
vtkTranslucentPass-Passes<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>So, could it be that the
vtkDepthPeelingPass has any negative side effects on rendering opaque objects?
<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Many thanks in advance and best regards, <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Rocco Gasteiger<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>--------------------------------------------------<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>Dipl.-Ing.
Rocco Gasteiger<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>Otto-von-Guericke
University<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>Faculty
of Computer Science<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>Department
of Simulation and Graphics<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>Universitätsplatz
2, 39106 Magdeburg, Germany<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'> <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>Office:
G29-223<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>Phone:
+49 391 67 127 59<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>Fax:
+49 391 67 111 64<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:Consolas'>Website:
</span><span style='font-size:10.5pt;font-family:Consolas'><a
href="http://wwwisg.cs.uni-magdeburg.de/cvcms/"><span lang=EN-US>http://wwwisg.cs.uni-magdeburg.de/cvcms/</span></a></span><span
lang=EN-US style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas'>--------------------------------------------------<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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