in news:47574968$1@news.povray.org mc wrote:

> Where I'm not sure I got it straight is that it looks like the
> refracted ray in b) is going to be "glass/air" instead of
> "glass/water" as we don't know yet that water will be hit.
> 
> 

From a modelling point of view, to get a better visual result, modell 
the water so it slightly overlaps the glass, no air gap between the 
two.

A solution in the POV-Ray source was once posted by Ron Parker in 
comp.graphics.rendering.raytracing. Couldn't find is posting with a 
quick search...

ingo

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