Smart Spline Subdivision
Spline Refiner is a 3dsMax script to automatically subdivide your entire splines uniformly without losing any detail!
Main features:
Equalize Subdivision: automatic / custom value / curves only. Increase subdivision / Optimize straight lines Process hundreds of shapes in seconds Compatible with 3dsMax 2012 and higher
Here's all the info: http://www.splinedynamics.com/spline-refiner/