<div dir="ltr">On list in case it use useful to others<div><br></div><div><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Ken Martin</b> <span dir="ltr"><<a href="mailto:ken.martin@kitware.com">ken.martin@kitware.com</a>></span><br>Date: Fri, Jul 7, 2017 at 8:47 AM<br>Subject: Re: [vtkusers] Control VTK frame rate<br>To: Andreas Buykx <<a href="mailto:A.Buykx@dianafea.com">A.Buykx@dianafea.com</a>><br><br><br><div dir="ltr">The default culler checks the bounding box of every actor/prop and if they are outside of the view frustum it does not render them. So the performance question becomes:<div><br></div><div>is checking the actor's bounding box (with the pipeline mtime check) faster than the time savings of sometimes not rendering the actor?</div><div><br></div><div>So when the actors will all typically be visible and there are lots of them (or their filter pipelines are long) removing the culler can save time because you may be CPU bound on checking pipeline mtime. Oddly enough checking pipeline mtime can be fairly time consuming for lots of pipelines/actors. So making the mapper static and removing the culler basically cuts out all pipeline mtime checks reducing the CPU load which with a fast GPU the CPU can often be the bottleneck for lots of VTK actors.</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 7, 2017 at 5:07 AM, Andreas Buykx <span dir="ltr"><<a href="mailto:A.Buykx@dianafea.com" target="_blank">A.Buykx@dianafea.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi, could you please explain what the removal of the last culler is about? In what situations is it needed? I looked in the VTK7.1.0 and found
that a small number of tests does this but do not understand why it is needed in these tests and not in others.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks a lot,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Andreas Buykx<u></u><u></u></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""> vtkusers [mailto:<a href="mailto:vtkusers-bounces@vtk.org" target="_blank">vtkusers-bounces@vtk.o<wbr>rg</a>]
<b>On Behalf Of </b>Ken Martin<br>
<b>Sent:</b> Wednesday, July 05, 2017 2:30 PM<br>
<b>To:</b> kay<br>
<b>Cc:</b> vtk<br>
<b>Subject:</b> Re: [vtkusers] Control VTK frame rate<u></u><u></u></span></p>
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<p class="MsoNormal">That doesn't seem to match the pseudo code you posted, where the transform is applied to a filter (shared by all the actors, well the only actor). Maybe an updated bit of pseudo code would help.<u></u><u></u></p>
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<p class="MsoNormal">In general with lots of actors you want to make sure <u></u><u></u></p>
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<p class="MsoNormal"> mapper->StaticOn();<u></u><u></u></p>
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<p class="MsoNormal">and<u></u><u></u></p>
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<p class="MsoNormal"> ren->RemoveCuller(ren->GetCull<wbr>ers()->GetLastItem());<u></u><u></u></p>
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<p class="MsoNormal">make sure it is a release build, and make sure your transformation is happening on the actor, not a filter such as trransformpolydata.<u></u><u></u></p>
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<p class="MsoNormal">On Tue, Jul 4, 2017 at 5:18 PM, kay <<a href="mailto:jayavardhanravi@outlook.com" target="_blank">jayavardhanravi@outlook.com</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Transforms are independent and are applied directly to the actor<br>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">-- <u></u><u></u></p>
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<p class="MsoNormal">Ken Martin PhD<u></u><u></u></p>
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<p class="MsoNormal">Distinguished Engineer<br>
<span style="font-size:9.5pt">Kitware Inc.</span><u></u><u></u></p>
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</font></span></blockquote></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><div><br></div>-- <br><div class="m_-143066591623443117gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Ken Martin PhD<div>Distinguished Engineer<br><span style="font-size:12.8px">Kitware Inc.</span><br></div><div>28 Corporate Drive<br>Clifton Park NY 12065<br><div><br></div><div><span style="font-size:10pt;font-family:Tahoma,sans-serif">This communication,
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