any idea what fractal algorithm might generate this shape?

Question

I Found this image around, and i'm curious what algorithm generates this kind of shape

In particular, i'm curious how the flow lines are generated, since usually the Mandelbrot iteration just generates different regions depending on the steps required to get into divergence

Answer 1

The algorithm maybe external argument / field lines :

http://fraktal.republika.pl/cpp_argphi.html

http://linas.org/art-gallery/escape/phase/phase.html

See also external ray in wikipedia

or triangle inequility

http://jussiharkonen.com/?page_id=65

www.ultrafractal.com/help/index.html?/help/coloring/standard/triangleinequalityaverage.html

Nice image. Where did you find it ?