Nieminen Juha wrote in message <38205c18@news.povray.org>...
>Peter Popov <pet### [at] usanet> wrote:
>: #declare Rn = (R*R-I*I)+X;
>: #declare In = (2*R*I-J*J)+Y;
>: #declare Jn= (2*J*I+2*J*R)+Z;
>
>  Where does this formula come from? Is the formula for Jn just a randomly
>chosen one?
>  What's the bailout value?


I got J by deciding that J is equal to the square root of -i, and working
from there.  The bailout I used was 2 (actually, the formula uses 2^2 as
that is faster than finding a square root), however you may want to use a
higher value.

Mark

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