[Qt-interest] Problems using QGraphicsView with a QGLWidget - example fails to run

[Mathias Gottschlag]

Hi,

I am trying Qt for a 3D game (with QML for the GUI) but at the moment 
face problems even setting up a simple 3D window. Basically I followed 
the instructions in http://doc.trolltech.com/qq/qq26-openglcanvas.html 
but only got the warning "OpenGLScene: drawBackground needs a QGLWidget 
to be set as viewport on the graphics view".

Thinking I might have made a mistake following the instructions I 
downloaded the example files, compiled and tried to run them, but ended 
up with exactly the same problem (no model in the demo was shown, only 
the 2D user interface).

Note that in both cases the QGraphicsView seems to draw garbage at the 
edges of the widget, screenshot: 
http://simplest-image-hosting.net/jpg-0-plasma-desktopah1912

I use Ubuntu 10.10 with Qt 4.7.1 and the proprietary nvidia driver 
installed, OpenGL works for everything else. Is there anything which 
could cause such problems then, and if so, where would I have to look 
for a solution? Anyone already reported issues like this? Google really 
did not help me much.

Thanks in advance,

Mathias Gottschlag