Is there a procedural way to set up a cylinder so that it looks like
it's half full of liquid--liquid that refracts, interacts with photons,
etc?   I know how to make the whole cylinder look like a liquid: I want
to be able to animate the level at which the liquid resides, etc.

I tried this a few times with setting up a gradient y in the pigment,
but this never had quite the right effect.  Are there interior maps or
is there some way to do this with the pigment?

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