[vtkusers] Z-Depth compositing of Renderers

[Rupert Shute]

Hi,
	I'm trying to create a setup with two renders that are composited
and displayed in the same render window. The first handles the bulk of the
rendering (volume and poly) and only requires re-rendering when the scene is
rotated/translated/scaled. The second renderer requires almost continuous
updating as it is being used to display the position of a haptic device.
I've been delving through the VTK source and have a few ideas as to how to
go about this, but would appreciate any hints/experiences people may have.
In particular I'm unclear as to whether this is achievable using existing
VTK code. Will I need to write my own z-depth compositer?
Cheers 
Rupert
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