In article <38b027d7@news.povray.org>, Nieminen Juha 
<war### [at] sarakerttunencstutfi> wrote:

>   I made a refraction test and I'm a bit confused.
> 
>   For the test, I made a typical glass-container-with-water object in 
>   three
> different ways:
>   1. The water cylinder is just a bit smaller than the inner surface of 
>   the
> glass cylinder.
>   2. The water cylinder is just a bit bigger than the inner surface of 
>   the
> glass cylinder.
>   3. The glass cylinder has no inner surface (it's just like a solid 
>   object);
> the glass cylinder is just inside it.

I am guessing the first one simulates a thin film of air between the 
liquid and the glass, you can see this effect in real life, sometimes in 
conditions where a liquid does not wet it's container, sometimes in 
layered structures(like fingernails or some plastics) that are splitting 
apart. You can see some total internal reflection which bounces the rays 
out of the glass.
The second one looks like the liquid is actually contacting the glass. 
The third one acts like the liquid is actually part of the glass. This 
is probably the least realistic, the other two depend on what you are 
doing.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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