[vtkusers] How to put Qt widgets on top of a VTK OpenGL scene

[clinton at elemtech.com]

In a QGraphicsView, QGLWidget::paintEvent isn't called, which means QGLWidget 
isn't doing some things for you.
Be sure you're calling glClear, glViewport, etc..

Clint

On Tuesday 21 October 2008 11:03:34 am Elvis Dowson wrote:
> Hi Clint,
>                    I was just wondering about why the
> QGraphicsScene::drawBackground method works with a QWidget and not a
> QGLWidget. There are possibly two OpenGL rendering contexts happening,
> one for the VTK off-screen rendered and the other for the QGLWidget
> renderer.
>
> So, do you think it has something to do with making the OpenGL
> rendering context current for the QGLWidget?
>
> Best regards,
>
> Elvis Dowson