Randomize the material IDs for the segments in your spline shapes.
Set random material IDs for the selected splines, either using the existing IDs or specifying a range of IDs.
Compatible with 3dsMax 2012 and higher.

Script
By rode3d · 2018-11-20
Randomize the material IDs for the segments in your spline shapes.
Set random material IDs for the selected splines, either using the existing IDs or specifying a range of IDs.
Compatible with 3dsMax 2012 and higher.

Tags: script, Material, random, 3dsmax, curve, randomize, id, free, plugin, IDS, segments, splineshape
Advanced edition of spline material IDs
rode3d · 2019-02-19
If you are looking for a professional tool for a fast and efficient edition of spline material IDs, then you need SubSpline plugin.
It's an Advanced Subobject Selector & Material IDs Editor for spline shapes in 3dsMax.