So what I understand from this is that with respect to refraction, there's
not much difference between a water scaled a bit larger than the inner surface
of the glass compared to just water inside the glass (which doesn't have an
inner surface).
  The difference appear in other two things: The amount of reflection (two
surfaces reflect more than one) and the rendering speed (two reflecting and
refracting surfaces take much longer to render than just one surface).

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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