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    $\begingroup$ Finally a question asked in a proper way. :) Minimized working example, a readable screenshot, and very understandable text. $\endgroup$
    – Markus von Broady
    Commented Jun 28 at 17:35
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    $\begingroup$ I found 2 problems however: one small problem is that you didn't explicitly state it should be iterative process, which I figured based on how the loops are filled or disappear far from the color that would initially affect it. Second, bigger problem: the algorithm won't work as you predict: consider the loop on ears, you expect it to disappear, but according to the algorithm it should simultaneously disappear from the dead-end, and thicken from the connection with the thicker part: i.imgur.com/fsFUxXP.png - if that's desirable, it's not clear what about the overlap of the arrows... $\endgroup$
    – Markus von Broady
    Commented Jun 28 at 17:46
  • $\begingroup$ First problem: Yes, the process should be iterative, perhaps with a repeat zone and a controllable number of repetitions? Actually, I wouldn't know how to do it. Second problem: You're right, I hadn't thought of this possibility. Actually, I think either approach would be fine for me (maximizing the growth of the selection, or minimizing it). Assuming it is possible! $\endgroup$
    – crucchi
    Commented Jun 28 at 17:54
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    $\begingroup$ Geonodes are turing-complete so it is possible of course. I'm just starting my movie evening however... $\endgroup$
    – Markus von Broady
    Commented Jun 28 at 17:55