Wasn't it Mike who wrote:
>I have been trying to mimic an experiment where there are two boxes 
>with different indices of refraction one on top of the other.  I am 
>still getting weird artifacts in the rendering.  I have posted this 
>problem here before and got some advice and it looks better, but there 
>are still problems.  I have also posted an image on the binaries.images 
>section to illustrate the problem.  The bottom region should be clear 
>and the top liquid should be a translucent yellow.  At the top of the 
>upper region there seems to be a weird line.  Also, there are weird 
>triangles formed.  I do not think these are all real.

I reckon that they are real. They're just refracted views of the shadow 
and of the back of the object.

-- 
Mike Williams
Gentleman of Leisure

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