> Cousin Ricky <ric### [at] yahoocom> wrote:
>
>> The question I have is how to best simulate interface between the glass
>> and a liquid without incurring either a coincident surface or spurious
>> IOR changes due to non-coincident surfaces.
> The way it used to be done was to overlap the surfaces to prevent an air gap
> from being in there.
>
>

The best way is to clip the glass, have an open to the top object for 
the glass-liquid part with the differential ior for the interface and a 
third object for the top surface, all enclosed into an union.
The glass part have the glass' ior. Maybe 1.5 to 1.8
The top surface have the ior of the liquid, around 1.33.
The inner surface ior would be ior (ior_glass/ior_liquid) -> 1.1278 to 
1.353.

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