An at least pretty good solution to computing parallel curves of Béziers is given in [1]. This can give very accurate results with a modest number of segments,

An at least pretty good solution to computing parallel curves of Béziers is given in [1]. This can give very accurate results with a modest number of segments, using techniques that are fast to evaluate and not terribly complicated. I know it's possible to do better in terms of number of segments, but it's not obvious to me how to make that faster than doing curve fitting and error bounding. [1]: https://raphlinus.github.io/curves/2021/02/19/parallel-curves.html https://raphlinus.github.io/curves/2021/02/19/parallel-curve...