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Draw a horizontal line under the water, then return back to its start with a wavy line crossing over the first line repeatedly. Very strange things happen. The first time i tried, it leapt out of the water then flapped around..


The site's algorithm generates negative masses when you cross the lines. There's a discussion about it in another thread.

This is a very obvious in retrospect flaw for anybody that has experience in graphic computing, but it's a common gotcha even there.


To trigger the behavior, it seems the waves need to be "asymmetric" in that if the leftest one is up, the rightest one needs to be down. Otherwise, it seems to behave normally.


Yeah, I noticed that, so it turns around rapidly. Maybe the "righting arm" torque overflows when it's much bigger than it ever would be in reality.




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