[vtkusers] Applying post-processing shader

[WeltMarco]

Hi all,
i'm currently working on a project in which i need to apply a
post-processing shader to a rendered scene (in particular it is a barrel
distortion shader). 

The problem is, by applying the shader on the actor's vtkProperty i can only
intervene on the actor's model (for example a shader that paints everything
red, will only make the actor red) but i need it to intervene on the scene
already rendered (so if i apply the same red shader, it will turn everything
red).

I was thinking of extracting an Actor2D by going through the WindowToImage
filter, but there is nothing about shaders on the vtkProperty2D.
Is there a way to do this in VTK?

Thank you in advance for your help
Marco



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