How can I calculate the radius of curvature of a 3D curve that is parameterized in the form:
x(t), y(t), z(t)?
It is the reciprocal of the curvature, whose formula can be found at Curvature - Wikipedia, the free encyclopedia
Essentially, at a point p, one takes the limiting value of the radius of the circle passing through p-dp, p, and p+dp.