20,000 words (plus interactive demos) on Bézier curves: http://pomax.github.io/bezierinfo/ by @TheRealPomax
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That's one thing I still need to write some more on. having http://stackoverflow.com/questions/25453159/getting-consistent-normals-from-a-3d-cubic-bezier-path … on just SO is not ideal
Interesting! I was taking 3D splines and rasterizing to a heightfield. For roads, etc. Wanted to do banking, but unsure how.
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I think this normal/tan/bitan stuff would've been great for it. We didn't end up having time for it anyhow.
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Reading through your answer, I would've been able to cheat on finding the normal because of how we controlled spline points.
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