In article <3d3eda9b$1@news.povray.org>,
 "TinCanMan" <Tin### [at] hotmailcom> wrote:

> 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).

That is a different situation, where the fluid doesn't "wet" the glass 
and a layer of air is trapped between the two. That is a very easy case, 
POV definitely doesn't have any trouble with that one, but water doesn't 
usually do that.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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