Le 05/04/2017 à 02:41, Alain a écrit :
> Le 17-04-04 à 19:38, omniverse a écrit :
>> 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.

Or you could just go that way:

http://wiki.povray.org/content/User:Le_Forgeron/HowTo/Perfect_glass

No overlapping, and just CSG in the right order.

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