Have a look to this article : 
http://labs.qt.nokia.com/2011/06/03/threaded-opengl-in-4-8/

I think it's maybe not possible with qt previous 4.8 version, but maybe under 
some conditions.

Basically, you need to call the updateGL() method from the worker thread.

Have also a look to this article about threading in Qt : 
http://labs.qt.nokia.com/2010/06/17/youre-doing-it-wrong/

Cheers,
Aurelien

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