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<p>Hi Robert,<br>
</p>
<p>thanks for the reply, it makes sense. From your experience, would you say it is worth the effort for ~6 views? Would you say the performance improvement is noticeable and worth the extra effort? I did some experiments, and I get a bit of a delay on interaction;
between the mouse down and the scene starting to rotate (using stock vtkInteractorStyleTrackballCamera for now). I am guessing it may be the FindPokedRenderer() taking time to figure out which renderer the interaction falls into... Some of my viewports also
have a vtkOrientationMarkerWidget, which creates its own renderer, and a couple views have overlay (non-interactive) renderer as well, so the total number of renderers is even higher, maybe 12 altogether.</p>
<p>Thank you!</p>
<p>Miro<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Róbert Špir <spir.robert@gmail.com><br>
<b>Sent:</b> Thursday, December 8, 2016 8:49:10 PM<br>
<b>To:</b> Miroslav Drahos; vtkusers@vtk.org<br>
<b>Subject:</b> RE: [vtkusers] interactor with one renwin and multiple renderers</font>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Hi Miro,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">I’m doing similar task. You can derive your own interactorstyle class from one of the vtkInteractorStyle classes. There you can override
mouse and key event functions and using this->Interactor->FindPokedRenderer(mouseX, mouseY); you can detect to which of the multiple renderers the user clicked and handle the interaction according to your needs.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Robert<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> vtkusers [mailto:vtkusers-bounces@vtk.org]
<b>On Behalf Of </b>Miroslav Drahos<br>
<b>Sent:</b> Thursday, December 8, 2016 10:44 PM<br>
<b>To:</b> vtkusers@vtk.org<br>
<b>Subject:</b> [vtkusers] interactor with one renwin and multiple renderers<o:p></o:p></span></p>
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<p><span style="font-family:"Calibri",sans-serif;color:black">Hi VTK folks,<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">I am trying to optimize my application, and am thinking to replace multiple QVTKWidget2 instances with only one widget + multiple viewports/renderers. Then I could issue only one expensive call to
vtkRenderWindow::Render() and re-draw everything.<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">I saw the example for multiple viewports (<a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/MultipleViewports" id="LPlnk960727">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/MultipleViewports</a>)
and it all looks very straightforward, but...<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">How do I handle interaction? Let's say in a typical quad view setup of a medical application, with 3 orthogonal slices and one 3D view there are different interactor styles needed. But it is the
renderwindow that provides interactor, so in the tiled version I would end up with only one common interactor/interactor style.<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">Any advice is greatly appreciated!<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">Miro<o:p></o:p></span></p>
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