"And" <49341109@ntnu.edu.tw> wrote:

> Many years ago I ever do something for the same goal.
>
http://news.povray.org/povray.binaries.images/thread/%3Cweb.5264d1b954cff585cc1fd1150%40news.povray.org%3E/?ttop=4230
56&toff=750
>
> But not the same, I used the math formula, not parametric formula. And just suit
> for a small offset(a thin shell)
> Because it is just an approximation.

Outstanding!  :)
This is exactly something I was trying to do and was having trouble with.
Hopefully I'll have time to look this over in detail tonight or over the
weekend.

Thanks so much for posting the link to that thread.  :)
Great work!

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