Recursive subdivision is not the best way to flatten quadratic Béziers to polylines. Here's a better way: https://raphlinus.github.io/graphics/curves/2019/12/23/flatten-quadbez.html … . Hopefully catnip for my followers who are really into 2D graphics and math.
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Thanks for the reference, it looks excellent. How did I not know about that before now?
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Shorter: you can use Wang’s (and successors) for computing the necessary number of line segments for quads, cubics, and even rationals.

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I managed to get my hands on the chapter. It's interesting reading, but not an especially tight bound. Generally recursive subdivision is 1.5x the number of segments as optimal.
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