title: Render a Qt3d view as a widget on QApplication MainWindow
body: <p>I'm starting out in Qt.
  I'm trying to render a 3D view from Qt3d on the MainWindow of a QApplication.</p>
  
  <p>The examples I've found are all based on QGuiApplications without widgets using Qt Quick and QML but I'm aiming to use widgets since this is going to be a desktop application.</p>
  
  <p>I have used Qt designer for my MainWindow UI form, On the central widget I have used Vertical layout to place tabs on my left and an empty widget with expansive horizontal size policy on the right. My goal is to create a Class that is based on an existing Qt class that will support Qt3d while also being able to handle widgets. Then from the Mainwindow form I want to promote the Widget to that class.</p>
  
  <p>I've tried QWindow but it doesn't allow widgets, am I suppose to Use QGlview to get access to the widgets?I'm not really looking to mess with opengl and isn't that deprecated now? Can someone direct me to an example that implements this?</p>
  
  <p>Thank you </p>