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<p>Hi Robert,</p>
<p>thanks for your response. I am using Ubuntu 16.04, with nvidia GTX 960, driver 370.28, Qt 5.3.1 and VTK 6.2. Haven't pursued this further, because we are going to try to combine QML and implement transitions between the views, sliding and resizing them,
and each view having a separate widget might make this simpler to start with. Among the views we want to be able to shuffle is also a Qt/QML-based non-VTK view (camera data; rendered using directly OpenGL).<br>
</p>
<p>Good to know, and thanks for the info!</p>
<p>Best,<br>
</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> Saturday, December 10, 2016 7:01:57 AM<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 style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">I have two main renderers and two overlay renderers. The main renderers contain multiple actors with 100+ k polygons and volume rendering and everything
is fast and without delay (on nvidia gtx770). I’m also using point picking that calls FindPokedRenderer on every mouse move without any problems.<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">Which os and qt version are you using? There is some problem with qt 5.5 in latest ubuntu that is causing delays with mouse interection. I’m using
qt5.7 from <a href="https://launchpad.net/~beineri/+archive/ubuntu/opt-qt57-xenial">
https://launchpad.net/~beineri/+archive/ubuntu/opt-qt57-xenial</a><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">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"> Miroslav Drahos [mailto:mdrahos@aurisrobotics.com]
<br>
<b>Sent:</b> Friday, December 9, 2016 10:27 PM<br>
<b>To:</b> Róbert Špir <spir.robert@gmail.com>; vtkusers@vtk.org<br>
<b>Subject:</b> Re: [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 Robert,<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">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.<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">Thank you!<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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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Róbert Špir <<a href="mailto:spir.robert@gmail.com">spir.robert@gmail.com</a>><br>
<b>Sent:</b> Thursday, December 8, 2016 8:49:10 PM<br>
<b>To:</b> Miroslav Drahos; <a href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</a><br>
<b>Subject:</b> RE: [vtkusers] interactor with one renwin and multiple renderers</span>
<o:p></o:p></p>
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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 [<a href="mailto:vtkusers-bounces@vtk.org">mailto:vtkusers-bounces@vtk.org</a>]
<b>On Behalf Of </b>Miroslav Drahos<br>
<b>Sent:</b> Thursday, December 8, 2016 10:44 PM<br>
<b>To:</b> <a href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</a><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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