Integrating a OgreWidget in a QMdiArea (Ogre3D)

Hello,

I made an application using Ogre3D (http://www.ogre3d.org/) and Qt. But I had some problems.

When we create a QWidget to render a Ogre3D Scene (by deriving a OgreWidget from QWidget), it works. But when we set this OgreWidget to a QMdiSubWindow and add the QMdiSubWindow to a QMdiArea, there is a problem. The widget doesn't want to let Ogre do a render.
I think the problem comes from the render method of the QMdiSubWindow when it is added to the QMdiArea.

You can see a french tutorial (with source code) at this link : http://irmatden.developpez.com/tutoriels/qt/integration-ogre-qt/
I used this tutorial to create my application.

I tried to derive the OgreWidget directly from QMdiSubWindow, this QMdiSubWindow can be displayed, but when we add this QMdiSubWindow to a QMdiArea, it's the same problem.
I attached the source code of this last test. Normally we should set the Qt::WA_PaintOnScreen flag on the QMdiSubWindow for doing a Ogre render, but this flag take the QMdiSubWindow entirely transparent in the QMdiArea.

To test the integration (or not) of the Widget in the QMdiArea, you can :

• go to the implementation of the fonction OgreMainWindow::createOgreWidget
• comment (or not) the line : mdiArea->addSubWindow( (QMdiSubWindow*)og );

The test the flag Qt::WA_PaintOnScreen flag, go in the contructor of the OgreWidget and uncomment this line : //setAttribute(Qt::WA_PaintOnScreen);

there are screenshots (from different tests) of this problem at this adress : http://ant.lafarge.free.fr/FTP/index.php?url=./Projects/QtOgre/

thanks,
Antoine Lafarge