Thank you very much. It helps indeed. First in understanding the isosurface and
second in understandig the mandelbulb computations. I wondered about a setting
by Tor Olav Kristensen in his code he gave here some years ago. Now I see that
this was an approach to estimate the distance to the mandelbulb, but different
from yours at first sight. But I must admit that my knowledge about stuff like
complex analysis and it extrapolation into 3-Space is a bit limited nowadays. If
I take his Mandelbulb function as a pigment function and compare it with yours,
differences are obvious. Since I like to play around with things, I will render
all three versions (Tor's, yours and my dichotomous one) and compare the
results.

Best regards,
Michael

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