[Interest] Qt 5.4 Beta with Qt3D's QGLPainter

[Jonathan Poncelet]

Thanks for the info. Is it possible to use the development version of Qt3D at the current time? I’ll probably do without widget overlaying for now, but I really do need the functionality of the library because with my current time frame I won’t be able to re-write all those bits and pieces on my own from scratch.

Thanks,

Jonathan

On 22 Nov 2014, at 19:14, Sean Harmer <sean.harmer at kdab.com> wrote:

> On 20/11/2014 16:32, Jonathan Poncelet wrote:
>> Hi all,
>> 
>> I’m attempting to use the QGLPainter from Qt3D with Qt 5.4’s new QOpenGLWidget - I was originally making do with QGLWidget from the previous Qt version but I was running into trouble with putting widgets, buttons, etc. on top of the GL widget, which is something I need to do. I’m fairly familiar with the Qt3D library but not so much on the in-depth side, and right now if I call begin() on a QGLPainter I create in the QOpenGLWidget’s paintGL() function, I get the following messages output before the program crashes:
>> 
>> Attempt to cast non-window surface
>> Attempt to activate GL window surface on bad context
>> 
>> I’ve tried various things - calling begin() and passing the widget’s GL context doesn’t have any effect, and the function won’t accept the context's QSurface as it’s expecting a QGLSurface. Is there any way to get QGLPainter         working with the new QOpenGLWidget, or will I have to stick with QGLWidget?
> The old Qt3D is no longer being developed or maintained so please do not use it. We are busy rewriting Qt3D but in it's current state it is not possible to overlay widgets over a Qt3D window. This is in the feature roadmap however.
> 
> It sounds like you just need to use QOpenGLWidget which allows compositing widgets on top of the contained OpenGL content. Alternatively if you want to overlay Qt Quick 2 UI on top of GL you can use the QQuickWindow::beforeRendering() signal. See the openglunderqml example to see how to do this.
> 
> Cheers,
> 
> Sean
> 
> -- 
> Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
> Klarälvdalens Datakonsult AB, a KDAB Group company
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