Can someone think of a better way for cover the gaps left by these 
sphere_sweep (cubic_spline) curves with bicubic_patch?. I've been 
looking at before posting this message and I am stuck at the point at 
which, for the example given in the documentation I arrived to a 
self-referential loop. (in short: being a circular shape you need to 
know previously the point B to know point A and point A to calculate the 
point B).
doc: http://www.povray.org/documentation/view/3.6.1/64/

Another point is commented by clipka a 2015 post on this issue.
http://news.povray.org/povray.tools.general/thread/%3Cweb.54e9d43835fbd8f37a3e03fe0%40news.povray.org%3E/

If it is mathematically impossible to make a perfect circle based on 
patches, I suppose that the task of adjusting them smoothly to this form 
can not be carried out either.

Any help or idea to the respective one is welcome, thank you very much 
in advance.

Bruno Gimeno

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