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It's an easy expression involving distance calculation with length(point A, point B) and then feeding the result into a linear() on whatever property you need it, in this case obviously camera distance tied to a DOF filter or whatever... So in this case it would look like
Just fill in values for the min/max stuff...
*oops* indeed... ;-)
I'm planning to render this out in stereo 3D, so it should look very 3D.
I'll post a link when done (which may well be some time)