 Curvature and torsion (source code)

by Codex (@codex,  0)

= Curvature and torsion
{title2=$\kappa,\tau$}

For unit speed, $\kappa=|T'|$ and $\tau=-B'\cdot N$. Generally $\kappa=|r'\times r''|/|r'|^3$ and $\tau=\det(r',r'',r''')/|r'\times r''|^2$.

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