[vtkusers] OpenGL stencil buffer disabled. Why? How to enable?

[Ingmar Wegner]

Hi everybody,
I got my augmented reality algorithms to work through overwriting the 
SetupPixelFormat method in VTKRenderWindow.
But to be able to be os independent (variable HDC), I would like to 
implement a method to be able to enable the OpenGL stencil buffer after 
the initialization of the VtkRenderWindow.

Before I do this, I would like to ask why stencil buffer is disabled by 
default in VtkRenderWondow.

PIXELFORMATDESCRIPTOR pfd = {
...
    0,                              //gc stencil buffer
...
  };

Performance? It shouldn't cost that much according to the standard video 
cards of these days.

Is there a standard way to enable the buffer apart from overwriting the 
method?

Thank you for your attention,
Ingmar