Cubic splines are a real thing for curve approximations. Maybe you’ve seen them mentioned in drawing programs (for interpolation)? Here’s a quick overview video. (First minute’s a simple explanation, last two minutes involve actual calculations.)
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QCUBI: Dammit Rhys, I do splines, not spines! Why does QLogan think I can be a medic? Just because QT did it?
RHYS: (thinks) Maybe since you’re as testy as ArcTan?
QCUBI: Anyway, Signum’s only here to point us back to Maud. What’s QLogan ordered her to do? Bring him tea?
RHYS: No. *sigh* That’s my job.
SLOPE: Tea? Come on, where’s the ice cream on this ship? I came along to relax.