On Wed, 24 Jul 2002 12:49:10 -0400, TinCanMan quoth:

>> One thing that has been bothering me is the "glass of water" type
>> situation...I'm not sure POV handles it correctly or how to model it
>> correctly.
>>
>>
> Here it is necessary to double up your surfaces so the surface of the
> water is slightly outside the surface of the glass. ie, the ray exits
> the glass into air and then into the water.  There is no way to avoid
> increasing the number of surfaces in this case if you want it to work
> correctly. For something completely immersed int the water (or glass for
> that matter) this isn't necessary (in case you think this is
> contradicatory to my previous post).
> 
> -tgq
 
If you could create the glass without an inner surface (perhaps by using
clipped_by), you would get the most realistic performance, since the ray
would go directly from glass to water, without passing through a layer of
air.

-- 
Mark

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