[osg-users] performance of QT GUI when integrated with OSG

[Lv Qing]

Hi,

     I have used class ViewerWidget(: public QWidget, public osgViewer::CompositeViewer) to integrate OSG into a QT application. Like this:

    viewer3DWindow = new ViewerWidget;
    QMdiSubWindow *tmpsubwin_3D = new QMdiSubWindow ;
    tmpsubwin_3D->setWidget(viewer3DWindow);

    And there are other QT GUIs like QT::Dialog,QT::LineEdit etc,they are in the same application but in different QMdiSubWindow.

    When our 3D widget (osg widget) has a lot of thing to render,the frame is down to 10 fps or even lower.It is totally acceptable for the 3D widget.

    However,the GUI widget seems also have low performance as the 3D widget.For example,when we tap some words to a QT::LineEdit,it take a long time to react our input.

   When 3D widget's frame back to normal,the QT GUI widget's performance is back to normal too.
    
   So it looks like the 3D OSG widget and QT GUI widget share the same graphic resource .When cpu or gpu usage is high,the 3D OSG widget try it best to keep performance ,while the  QT GUI widget dose not have  enough
resource  to react.

   We use linux.Any advice?



... 

Thank you!

Cheers,
Lv

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