RoundEdge 2.0 now has macros for rounded boxes with unequal edge radii. 
As a bonus, a wrapper is added for POV-Ray's cryptic isosurface evaluate 
feature.

In January of 2016, I posted an update to RoundEdge to correct a torus 
artifact.  More recently, while working on RoundEdge 2.0, I noticed that 
I had made the torus change in February 2015, and didn't post it until 
after clipka mentioned the artifact in December that year.  Why did I 
wait 350 days to post it?

I think it must have been that I was already working on the unequal edge 
radii when I made the torus correction, and planned to roll out the fix 
along with the new feature.  But the unequal edge radii turned out to 
have far more variations than I anticipated, so I put the whole update 
on the back burner--until clipka's comment induced me to rethink holding 
up the torus correction.  A massive toothache in early 2015 may have 
also been a factor in pausing development.

Well, it's 5 years later, and the new unequal edge macros are now 
completed and uploaded.

http://lib.povray.org/searchcollection/index2.php?objectName=RoundEdge&contributorTag=Cousin%20Ricky

An isosurface elliptical toroid is still on my wish list.  Although I've 
already implemented mesh toroids, they cannot be deformed or blobbed. 
Back in 2008, Nicolas George proposed a function which, upon 
implementation, I found unsatisfactory.  (He projected lines from the 
origin through the central ellipse, which I had previously determined to 
be a bad approach.)  In 2006, Sebastian H. posted a function that 
appears to create the exact shape I desire, but I have been unable to 
verify that the gradients are stable.  Stable gradients would be 
essential for isosurface blobbing.

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