I implemented an algorithm to render connected Julia sets coloured according to angle by inverse iteration of a loop.

Reverse engineered from the description in the PDF linked at the bottom of virtualmathmuseum.org/Fractal/

My code:


Fails for dendrites like c=-2 and c=i, I suspect the "prune neighbouring points that are too close" step is too zealous and prunes the tips down to nothing, then it segfaults in the part due to false assumption of non-empty list. Not 100% sure though..

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