CShake wrote:
[...]
>    phin=atan2(y,z)*n;
[...]
>   phin=atan2(y,z)*n;
[...]

Hmm.  Perhaps these have a small error?  I think maybe they should be like this.

   phin=atan2(y,x)*n;

http://www.skytopia.com/project/fractal/2mandelbulb.html#formula

Also, I used the same starting point, then grabbed one of the wikipedia
references and read some more.  (I also think I found a small improvement and
plan to write it up over the break.)

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