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Given the equations found in the answer here:

Determine arc-length of a Catmull-Rom spline

How would one A) Apply this to a 3D Catmull-Rom Spline, and B) write A out programmatically (for the math illiterate)?

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The generalisation of the formulas to 3D splines is straightforward; each time you see an expression with x and y, just add a 3rd term with z. – Sam Hocevar Jan 14 at 7:49
@Sam You could post that as an answer. – Anko Feb 18 at 12:53

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