[vtkusers] 3D model and 2d Image overlay - depth issues, flickering

[manikandtan.ck]

I tried using the renderer->setlayer function 
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/BackgroundImage
<http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/BackgroundImage>   and
implemented used two renderers to make the 3d and 2d into layers 0 and 1.
There I found a quirk that if I set interactivity on for both renderers then
I get no Interaction. When I turn on interactivity of just 3d layer, both 3d
and 2d moves but it causes flickering. Nothing moves when I turn just the 2d
on. 



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