<div dir="ltr"><div>Hi Werner,</div><div><br></div><div>We share the same belief around Qt.</div><div><br></div><div>Concerning your implementation, it's not clear how you integrate the OpenGL window into Qt. If you are willing to share a simple application that demonstrates your setup that would be a nice start to understand and discuss your approach ?<br></div><div><br></div><div>Recent versions of Qt5 use OpenGL to render many UI components and thus it is not unfrequent to have many OpenGL context created inside an application. It is my understanding that QOpenGLWidget and QOpenGLWindow manage to make these OpenGL context handling transparent.</div><div></div><div>The main difference between these two is that the QOpenGLWidget is rendered inside a ImageBuffer or something like that and that the QOpenGLWindow mimics the Qt4's QGLWidget we were used to allowing QuadBuferring etc.. But being a Window lots of the Widget inherited things have to be implemented (mostly UI events).</div><div><br></div><div>Regards<br></div><div><div><div dir="ltr" class="m_-2658650971414500090gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">--<br>nǝıɥʇɐ<span style="color:rgb(51,51,51);font-family:'Open Sans','Helvetica Neue',Helvetica,Arial,sans-serif;font-size:14px;line-height:20px;background-color:rgb(249,249,249)">Ɯ</span></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, 11 Sep 2018 at 13:02, Werner Modenbach <<a href="mailto:Werner.Modenbach@texion.eu" target="_blank">Werner.Modenbach@texion.eu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
Hi Mathieu,<br>
<br>
thanks for your support for OSG/Qt integration. I think there are
really many people using OSG together with Qt.<br>
Qt is just great for building multi environment user interfaces.<br>
But there is one thing I don't really understand. There is some
discussion sometimes about difficulties in this integration.<br>
My integration is dated April 2013 and I didn't need any changes
since then.<br>
<br>
<span style="color:#808000">class</span><span style="color:#c0c0c0"> </span><span style="color:#800080">Cl_3D_OsgViewer_QT</span><span style="color:#c0c0c0"> </span>:<span style="color:#c0c0c0"> </span><span style="color:#808000">public</span><span style="color:#c0c0c0">
</span><span style="color:#800080">QWidget</span>,<span style="color:#c0c0c0"> </span><span style="color:#808000">public</span><span style="color:#c0c0c0"> </span><span style="color:#800080">osgViewer</span>::<span style="color:#800080">Viewer</span><span style="color:#c0c0c0">
</span>{...
<pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">
</pre>
It works without any problems with every version of Qt since that
time.<br>
So where is the problem?<br>
<br>
OK, I'm not using VS 20xx but Qt Creator and g++ instead. Maybe that
makes the difference. But in this case <br>
it isn't really a problem of Qt integration but a VS problem.<br>
I see that some people tend integrating OSG into QOpenGLWindow. In
my opinion this is a stony way <br>
because Qt GL wasn't that stable and finally decided since many
years now. So things change frequently <br>
and this is always causing headache for keeping integrations
running.<br>
<br>
On the other hand I think there is nothing more developed and stable
than QWidget. <br>
If someone needs help send me a PM and I'm willing to share my
integration class.<br>
<br>
- Werner -<br>
<br>
<div class="m_-2658650971414500090m_-5575806555701100837moz-cite-prefix">Am 10.09.2018 um 18:42 schrieb Mathieu
MARACHE:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>Back from holidays...</div>
<div><br>
</div>
<div>Community support is thin when considering
OpenSceneGraph with Qt. I am currenlty the only maintainer
of osgQt because I have a software using it and I didn't
want the project to be tossed out. <br>
</div>
<div><br>
</div>
<div>The Qt4 way of doing things with legacy osgQt (that was
droped from OpenSceneGraph) doesn't fit well with the Qt5
way of doing things. Since Qt5.7 there are even
incompatibilities (black screens, etc.).</div>
<div><br>
</div>
<div>Qt4 support is getting difficult, even debian is
dropping Qt4 (<a href="https://wiki.debian.org/Qt4Removal" target="_blank">https://wiki.debian.org/Qt4Removal</a>).</div>
<div><br>
</div>
<div>In anticipation I have proposed to drop Qt4 and
concentrate only on Qt5. Robert only asked to keep the Qt4
version around and make it clear which version of osg
compiles with which version/branch of osgQt.</div>
<div><br>
</div>
<div>There is a feature branch (since Feb '18) of the Qt5
way of doing things awaiting testing and validation from
the community. This is the code I use in my application
which was crafted by paid support from KDab's Mike Krus
(from which I had authorization to open source).<br>
</div>
<div><br>
</div>
<div><a href="https://github.com/openscenegraph/osgQt/tree/feature/osgQOpenGL" target="_blank">https://github.com/openscenegraph/osgQt/tree/feature/osgQOpenGL</a></div>
<div><br>
</div>
<div>Regards<br>
</div>
<div>
<div>
<div dir="ltr" class="m_-2658650971414500090m_-5575806555701100837gmail_signature">
<div dir="ltr">--<br>
nǝıɥʇɐ<span>Ɯ</span></div>
</div>
</div>
<br>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Mon, 30 Jul 2018 at 17:07, Robert Osfield
<<a href="mailto:robert.osfield@gmail.com" target="_blank">robert.osfield@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Mon, 30
Jul 2018 at 15:59, Andrew Cunningham <<a href="mailto:andrewC@mac.com" target="_blank">andrewC@mac.com</a>> wrote:<br>
><br>
> Back on the original topic :)<br>
><br>
> This is a really simple QtOSGWidget that I used as a
starting point for an OSG widget in a QDialog. Simple and
works fine.<br>
><br>
> <a href="https://github.com/vicrucann/QtOSG-hello" rel="noreferrer" target="_blank">https://github.com/vicrucann/QtOSG-hello</a><br>
<br>
Just had a quick look at the code. It only works "fine"
because there<br>
it's a trivial example, it's buggy. Please compare to the
the<br>
osg::Camera setup in the osgQt master and see if you can see
the<br>
error, in this example. If you can then you'll be able to
spot what<br>
to fix in your own programs.<br>
<br>
Robert.<br>
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