In article <3A46CC17.EBD9DEB9@pacbell.net>, lin### [at] povrayorg 
wrote:

> It is useful to allow refraction for patch objects. Render the following
> and you will clearly see that it refracts just as you would expect it to
> in real life -

No it doesn't...it refracts like the surface of an object would, 
everything seen through it is "inside". If there is something behind it, 
it refracts as if it extended all the way to that object.
In real life, if infinitely thin objects were possible, they wouldn't 
refract at all.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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