[vtkusers] prop3D always in foreground

[Miro Drahos]

Hi all,
I've been scratching my head over this one for some time now, searching 
the mailing list, but still don't have a clue:

How do I manually set a z-order of a prop? In other words, I have a prop 
(silhouette outline of a surface) that I want to be rendered always in 
foreground.
Since this is output of vtkPolyDataSilhouetteFilter, it is rendered via 
vtkMapper and vtkActor and not via vtkMapper2D vtkActor2D. I tried to 
visualize it via the *2D pipeline since I saw the 
SetDisplayLocationToForeground() of vtkProperty2D but it did not render 
correctly.

I am thinking I need to traverse vtkCullerCollection 
<http://www.vtk.org/doc/nightly/html/classvtkCullerCollection.html> from 
my renderer, but then what?
The class vtkCuller has only one method declared virtual double 
Cull(...) with no definition.

I am kind of lost here and would very much appreciate any advice on this.
Thank you!
Miro

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