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"IGM" <iar### [at] gmail com> wrote:
> Hi,
> I'm following also the discussion
>
http://news.povray.org/povray.general/thread/%3CXnsA9E3A3F647A49seed7%40news.povray.org%3E/
>
> The approach, in my opinion, is still far from being user friendly, but I
> _think_ that the problem is similar to mine.
>
> igmar
Yes, I recall briefly looking at that thread.
TOK has a very thorough understanding of a lot of the underlying math, and
excels in applying it and translating it into code.
Since this (in my mind) seems very similar to isosurfaces, you might take a look
at
http://www.econym.demon.co.uk/isotut/substitute.htm
to see how various transforms are implemented in functions.
As for rotations, I looked into the transforms for that a number of times.
There should be some useful links in this thread
http://news.povray.org/povray.general/thread/%3Cweb.5b9ed475f76fb4baa47873e10%40news.povray.org%3E/
as well as others to show you how to change the expressions for x, y, and z to
rotate the function you want to use.
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