<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Luca, <div class=""><br class=""></div><div class="">I haven't looked into your problem/thread in detail, but I have one suggestion that might come useful: are you maybe at some point doing things in a secondary thread, and somehow passing data to your widget from this thread?</div><div class=""><br class=""></div><div class="">It has happened to me in the past, and the GUI would temporarily switch to drawing in black or not updating any more.</div><div class=""><br class=""></div><div class="">If you are using background threads, look into this.</div><div class=""><br class=""></div><div class="">Best,</div><div class=""><br class=""></div><div class="">Alessandro<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Oct 17, 2017, at 5:23 PM, <a href="mailto:bartolomei-luca@virgilio.it" class="">bartolomei-luca@virgilio.it</a> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Thanks to everyone for the inputs.</div><div class=""><br class=""></div><div class="">I will try to include the QVTKOpenGLWidget in my project. I will let you know if I succeed in doing that and if this solve the issue.</div><div class=""><br class=""></div><div class="">@Shawn -> About the Cmake: I can successfully build VTK 8.0 and use it in QT if I use a newer version of cmake (currently, the default cmake version for my system is 3.2.2). The problem is that I cannot build my project with VTK 8.0 using ROS. So the problem is not Cmake itself, but the version ROS uses for building (too "old" for VTK 8.0). I will try also to fix this.</div><div class=""><br class=""></div><div class="">For the moment, thanks to all. I will let you know in case of success/failure.<br class=""></div><div class="">Best,</div><div class="">Luca<br class="">
</div><blockquote class="">
----Messaggio originale----<br class="">
Da: "Shawn Waldon" <<a href="mailto:shawn.waldon@kitware.com" class="">shawn.waldon@kitware.com</a>><br class="">
Data: 17-ott-2017 16.18<br class="">
A: "Sankhesh Jhaveri"<<a href="mailto:sankhesh.jhaveri@kitware.com" class="">sankhesh.jhaveri@kitware.com</a>><br class="">
Cc: "<a href="mailto:bartolomei-luca@virgilio.it" class="">bartolomei-luca@virgilio.it</a>"<<a href="mailto:bartolomei-luca@virgilio.it" class="">bartolomei-luca@virgilio.it</a>>, "Elvis Stansvik"<<a href="mailto:elvis.stansvik@orexplore.com" class="">elvis.stansvik@orexplore.com</a>>, "VTK Users"<<a href="mailto:vtkusers@vtk.org" class="">vtkusers@vtk.org</a>><br class="">
Ogg: Re: [vtkusers] QVTKWidget in QT GUI freezes other QWidgets<br class="">
<br class="">
<div dir="ltr" class=""><div class=""><div class=""><div class="">When one of the projects I work on first started using Qt5 with VTK we had similar problems. Embedding a QVTKWidget in a Qt5 Tab or Scroll widget or using it alongside other OpenGL-based widgets in Qt5 can cause these kinds of issues and this was the motivation for creating the QVTKOpenGLWidget. The QVTKOpenGLWidget correctly lets Qt manage the OpenGL context rather than hacking it in with window system calls. You could try grabbing the QVTKOpenGLWidget code from VTK 8.0.0 and copying it into your project as a temporary solution (I'm not sure if it relies on any features added between 7.1 and 8.0).<br class=""><br class=""></div>You said upgrading CMake was blocking you from using more recent VTK? The CMake developers try really hard to be backwards compatible. Have you reported the issues you are having to them? I know they try their best to handle compatibility issues that are reported.<br class=""><br class=""></div>HTH,<br class=""></div>Shawn<br class=""><div class=""><div class=""><div class=""><br class=""></div></div></div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Tue, Oct 17, 2017 at 10:03 AM, Sankhesh Jhaveri <span dir="ltr" class=""><<a href="mailto:sankhesh.jhaveri@kitware.com" target="_blank" class="">sankhesh.jhaveri@kitware.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class=""><div class="m_-7878088107456768635markdown-here-wrapper" style="font-family:"Lucida Sans",Verdana,sans-serif;color:rgb(11,83,148)"><p style="margin:0px 0px 1.2em!important" class="">How are you initializing the QVTKWidget?<br class="">One other thing to test would be to try removing the QTabWidget and showing both the QVTKWidget and QWidget in the same central widget side-by-side. Finally, you could see if the setup works fine with Qt4.</p><p style="margin:0px 0px 1.2em!important" class="">I am not sure how you would put a GLUT window inside a QWidget. But if you have can do that, you could try the <code style="font-size:0.95em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(218,218,218);background-color:rgb(232,232,232);border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;display:inline" class="">vtkExternalOpenGLRenderWindow</code>. See <a href="https://gitlab.kitware.com/vtk/vtk/blob/e029e1634631893147fad2c6b379b6ff7db92881/Rendering/External/Testing/Cxx/TestGLUTRenderWindow.cxx" target="_blank" class="">TestGLUTRenderWindow.cxx</a> for an example.</p>
<div title="MDH:PHNwYW4gc3R5bGU9ImZvbnQtc2l6ZTogc21hbGw7Ij5Ib3cgYXJlIHlvdSBpbml0aWFsaXppbmcg
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LjwvZGl2Pg==" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0" class=""></div></div></div><div class="HOEnZb"><div class="h5"><br class=""><div class="gmail_quote"><div dir="ltr" class="">On Tue, Oct 17, 2017 at 9:24 AM <a href="mailto:bartolomei-luca@virgilio.it" target="_blank" class="">bartolomei-luca@virgilio.it</a> <<a href="mailto:bartolomei-luca@virgilio.it" target="_blank" class="">bartolomei-luca@virgilio.it</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="">Hello Sankhesh,</div><div class=""><br class=""></div><div class="">thanks a lot for the reply.</div><div class=""><br class=""></div><div class="">Let's say the GUI "pipeline" is as I explained to Elvis. Then:<br class=""></div><ul class=""><li class="">At the moment the two widgets are under the central widget (a QWidget). They are in two different tabs of a QTabWidget. I tried to move the QVTKWidget out of its tab but no luck. I have also noted another thing. If I show at the same time the QWidget and the QVTKWidget, the QVTKWidget works fine, but the QWidget freeze. That's why I thought that it could be an OpenGL context issue.<br class=""></li><li class="">What do you mean by "replacing ROS widget with a simple button"? In any case, I can make QVTKWidget work, but no success with the QWidget. It just freeze on the last view.</li><li class="">Unfortunately, QVTKOpenGLWidget is available only for VTK 8.0 and higher. I am using VTK 7.1 and I cannot upgrade to 8.0 because of the cmake that is installed on my laptop. I cannot upgrade the cmake version due to some compatibility issues with ROS. I will get in a lot of trouble if I try to do that. Is there a way to use glut or vtkOpenGLRenderer (available in vtk 7.1)?</li></ul>Thanks a lot again for the help.<br class="">Best,<br class="">Luca<br class="">
<br class="">
<blockquote class="">
----Messaggio originale----<br class="">
Da: "Sankhesh Jhaveri" <<a href="mailto:sankhesh.jhaveri@kitware.com" target="_blank" class="">sankhesh.jhaveri@kitware.com</a>><br class="">
Data: 17-ott-2017 14.21<br class="">
A: "Elvis Stansvik"<<a href="mailto:elvis.stansvik@orexplore.com" target="_blank" class="">elvis.stansvik@<wbr class="">orexplore.com</a>>, "<a href="mailto:bartolomei-luca@virgilio.it" target="_blank" class="">bartolomei-luca@virgilio.it</a>"<<a href="mailto:bartolomei-luca@virgilio.it" target="_blank" class=""><wbr class="">bartolomei-luca@virgilio.it</a>></blockquote><blockquote class=""><br class="">
Cc: "VTK Users"<<a href="mailto:vtkusers@vtk.org" target="_blank" class="">vtkusers@vtk.org</a>><br class="">
Ogg: Re: [vtkusers] QVTKWidget in QT GUI freezes other QWidgets<br class="">
<br class="">
<div dir="ltr" class=""><div class="m_-7878088107456768635m_1798707275503750001markdown-here-wrapper" style="font-family:"Lucida Sans",Verdana,sans-serif;color:rgb(11,83,148)"><p style="margin:0px 0px 1.2em!important" class="">Hi Luca,</p>
<ul style="margin:1.2em 0px;padding-left:2em" class="">
<li style="margin:0.5em 0px" class=""><div style="margin: 0.5em 0px !important;" class="">Do the QWidget and QVTKWidget overlap at all or are they separated by some QFrame border, etc. ? If they are not overlapping, it means they are not sharing the OpenGL context.</div>
</li>
<li style="margin:0.5em 0px" class=""><div style="margin: 0.5em 0px !important;" class="">Have you tried replacing the ROS widget with a simple button to see if the QVTKWidget works properly?</div>
</li>
<li style="margin:0.5em 0px" class=""><div style="margin: 0.5em 0px !important;" class="">Lastly, the QVTKWidget is known to have rendering issues with Qt5. Try using the QVTKOpenGLWidget to see if anything changes.</div>
</li>
</ul><p style="margin:0px 0px 1.2em!important" class="">Best,<br class="">Sankhesh</p>
<div title="MDH:SGkgTHVjYSw8ZGl2PjxkaXY+PGJyPjwvZGl2PjxkaXY+LSBEbyB0aGUgUVdpZGdldCBhbmQgUVZU
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PC9kaXY+PGRpdj5CZXN0LDwvZGl2PjxkaXY+U2Fua2hlc2g8L2Rpdj4=" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0" class=""></div></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="">On Tue, Oct 17, 2017 at 3:29 AM Elvis Stansvik <<a href="mailto:elvis.stansvik@orexplore.com" target="_blank" class="">elvis.stansvik@orexplore.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">2017-10-17 9:22 GMT+02:00 <a href="mailto:bartolomei-luca@virgilio.it" target="_blank" class="">bartolomei-luca@virgilio.it</a><br class="">
<<a href="mailto:bartolomei-luca@virgilio.it" target="_blank" class="">bartolomei-luca@virgilio.it</a>>:<br class="">
> Hello Elvis,<br class="">
><br class="">
> thanks for your reply.<br class="">
> I don't have the gui avaiable right now; I will send a picture as soon as I<br class="">
> can.<br class="">
><br class="">
> To answer your question: yes, if I remove the QVTKWidget and replace it with<br class="">
> QWidget everything works. The problems occur only when the QVTKWidget is<br class="">
> present.<br class="">
><br class="">
> The GUI is built to work in this way:<br class="">
> 1) start showing stuff on the QWidget;<br class="">
> 2) After a while, the QVTKWidget shows some other stuff.<br class="">
><br class="">
> The QWidget is showing some interactive scene and it uses a library<br class="">
> ("librviz" - for ROS users) based on Ogre and OpenGL. Could the problem<br class="">
> happen because the QVTKWidget interfere with the already existing OpenGL<br class="">
> context?<br class="">
<br class="">
I don't know, but it sounds like it's possible. I think there are<br class="">
other people on this list who knows much more about OpenGL and how VTK<br class="">
uses it than I do, so I'll let those answer that.<br class="">
<br class="">
Elvis<br class="">
<br class="">
> I don't know if this is the cause, because it is sufficient to have the<br class="">
> QVTKWidget on the Gui to make the QWidget freeze.<br class="">
><br class="">
> Anyway, I have looked at this example:<br class="">
> <a href="https://www.vtk.org/Wiki/VTK/Examples/Cxx/GLUT" rel="noreferrer" target="_blank" class="">https://www.vtk.org/Wiki/VTK/<wbr class="">Examples/Cxx/GLUT</a><br class="">
> but no luck so far. Maybe is a problem of drivers (I have an Nvidia GeForce<br class="">
> GTX 950M on Ubuntu 14.04 LTS).<br class="">
><br class="">
> Best,<br class="">
> Luca<br class="">
><br class="">
><br class="">
> ----Messaggio originale----<br class="">
> Da: "Elvis Stansvik" <<a href="mailto:elvis.stansvik@orexplore.com" target="_blank" class="">elvis.stansvik@orexplore.com</a>><br class="">
> Data: 17-ott-2017 8.36<br class="">
> A: <<a href="mailto:bartolomei-luca@virgilio.it" target="_blank" class="">bartolomei-luca@virgilio.it</a>><br class="">
> Cc: "VTK Users"<<a href="mailto:vtkusers@vtk.org" target="_blank" class="">vtkusers@vtk.org</a>><br class="">
> Ogg: Re: [vtkusers] QVTKWidget in QT GUI freezes other QWidgets<br class="">
><br class="">
><br class="">
> Den 13 okt. 2017 12:08 em skrev "<a href="mailto:bartolomei-luca@virgilio.it" target="_blank" class="">bartolomei-luca@virgilio.it</a>"<br class="">
> <<a href="mailto:bartolomei-luca@virgilio.it" target="_blank" class="">bartolomei-luca@virgilio.it</a>>:<br class="">
><br class="">
> Hello everyone!<br class="">
><br class="">
> I have a problem with the QT GUI I am creating. Basically, I have an<br class="">
> interactive QWidget, a QVTKWidget and a "Quit" button.<br class="">
><br class="">
> When I launch my app, I can interact with the QWidget without any problem (I<br class="">
> have a 3D interactive scene, where I can zoom and rotate).<br class="">
> However, as soon as the QVTKWidget becomes "active" (i.e. some function in<br class="">
> my code start using it or if I click on it), both the QWidget and the<br class="">
> QVTKWidget freeze. The app keeps on working, since the "Quit" button works<br class="">
> as it should.<br class="">
><br class="">
> If I have a GUI with either the QWidget or the QVTKWidget (only one of them)<br class="">
> everything works fine. The problem is if I try to include both of them at<br class="">
> the same time.<br class="">
><br class="">
> Do you have any idea why this happens?<br class="">
><br class="">
><br class="">
> I don't have any immediate ideas. It would really help to see a small<br class="">
> example where the problem occurs.<br class="">
><br class="">
> Does it work if you put two of your QWidgets in the application. I mean, if<br class="">
> you remove the QVTKWidget and put another one of your QWidget where it was?<br class="">
><br class="">
> Elvis<br class="">
><br class="">
><br class="">
> Thanks a lot for you help.<br class="">
><br class="">
> ______________________________<wbr class="">_________________<br class="">
> Powered by <a href="http://www.kitware.com/" rel="noreferrer" target="_blank" class="">www.kitware.com</a><br class="">
><br class="">
> Visit other Kitware open-source projects at<br class="">
> <a href="http://www.kitware.com/opensource/opensource.html" rel="noreferrer" target="_blank" class="">http://www.kitware.com/<wbr class="">opensource/opensource.html</a><br class="">
><br class="">
> Please keep messages on-topic and check the VTK FAQ at:<br class="">
> <a href="http://www.vtk.org/Wiki/VTK_FAQ" rel="noreferrer" target="_blank" class="">http://www.vtk.org/Wiki/VTK_<wbr class="">FAQ</a><br class="">
><br class="">
> Search the list archives at: <a href="http://markmail.org/search/?q=vtkusers" rel="noreferrer" target="_blank" class="">http://markmail.org/search/?q=<wbr class="">vtkusers</a><br class="">
><br class="">
> Follow this link to subscribe/unsubscribe:<br class="">
> <a href="http://public.kitware.com/mailman/listinfo/vtkusers" rel="noreferrer" target="_blank" class="">http://public.kitware.com/<wbr class="">mailman/listinfo/vtkusers</a><br class="">
><br class="">
><br class="">
><br class="">
><br class="">
______________________________<wbr class="">_________________<br class="">
Powered by <a href="http://www.kitware.com/" rel="noreferrer" target="_blank" class="">www.kitware.com</a><br class="">
<br class="">
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<br class="">
Please keep messages on-topic and check the VTK FAQ at: <a href="http://www.vtk.org/Wiki/VTK_FAQ" rel="noreferrer" target="_blank" class="">http://www.vtk.org/Wiki/VTK_<wbr class="">FAQ</a><br class="">
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Search the list archives at: <a href="http://markmail.org/search/?q=vtkusers" rel="noreferrer" target="_blank" class="">http://markmail.org/search/?q=<wbr class="">vtkusers</a><br class="">
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</blockquote></div><div dir="ltr" class="">-- <br class=""></div><div class="m_-7878088107456768635m_1798707275503750001gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class="m_-7878088107456768635m_1798707275503750001inbox-markdown-here-wrapper" style="font-family:'proza libre',sans-serif;color:rgb(0,56,107)"><h5 id="m_-7878088107456768635m_1798707275503750001inbox-sankhesh-jhaveri" style="margin:1.3em 0px 1em;padding:0px;font-size:1.1em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(238,238,238);font-weight:bold;color:rgb(11,65,148)" class="">Sankhesh Jhaveri</h5>
<h6 id="m_-7878088107456768635m_1798707275503750001inbox--sr-research-development-engineer-kitware-http-www-kitware-com-518-881-4417" style="margin:1.3em 0px 1em;padding:0px;font-size:1em;color:rgb(11,83,148);font-family:'open sans',sans-serif;font-weight:normal" class=""><i class="">Sr. Research & Development Engineer</i> | <a href="http://www.kitware.com/" target="_blank" class="">Kitware</a> | <a href="tel:(518)%20881-4417" value="+15188814417" target="_blank" class="">(518) 881-4417</a></h6>
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