[vtkusers] Trouble using VTK Widget with QVTK

[andyjk]

Thanks

I tried:

        vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New(); 
	ui->widget->SetRenderWindow(renderWindow);

This compiles OK, but when I run, it immediately gives the error:

QVTKOpenGLWidget requires a `vtkGenericOpenGLRenderWindow`. `
vtkWin32OpenGLRenderWindow ` is not supported.

because I presume this is the wrong type.
Strangely, 
      
          vtkSmartPointer<vtkRenderWindow> renderWindow =
ui->widget->GetRenderWindow();

is allowed, and runs - though it fails to render because I think the context
is wrong (ie in main.cpp I have the line
     
         
QSurfaceFormat::setDefaultFormat(QVTKOpenGLWidget::defaultFormat());

which allows me to render in the QVTKpenGLWidget

However, 

       vtkNew<vtkGenericOpenGLRenderWindow> renderWindow =
ui->widget->GetRenderWindow()

is not allowed by the compiler - telling me that GetRenderWindow() is
expecting a vtkRenderWindow, not an OpenGL one.

So it seems I can create a new OpenGL RenderWindow and set the widget Window
to this :

     vtkNew<vtkGenericOpenGLRenderWindow> renderWindow;
     ui->widget->SetRenderWindow(renderWindow);

and this gives be the sphere on screen, moveable mouse, but no contour
widget.

But I can't grab the existing render window from the widget, because

    vtkSmartPointer<vtkRenderWindow> renderWindow =
ui->widget->GetRenderWindow();

compiles, but fails at runtime (I think due to the mismatch between a
vtkRenderWindow and an OpenGL one), and 

    vtkNew<vtkGenericOpenGLRenderWindow> renderWindow =
ui->widget->GetRenderWindow()

will not compile because of the perceived type mismatch.




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