SubSpline is an Advanced Subobject Selector & Material IDs Editor for spline shapes in Autodesk 3dsMax.

Easily expose on screen the vertex numbers and material IDs for all your selected shapes, with a simple toggle button.
Take advantage of cutting-edge tools for spline subobject selection that complement and extend 3dsMax’s standard tools: shrink/grow selection, offset selection, dot selection, random selection, and more!
Accurately manage and control the material IDs assignment for your spline curves and their segments: quick buttons, predefined patterns, offset IDs, randomize IDs, etc. This is really helpful to control materials in spline modeling, hair plugins or procedural modeling plugins like RailClone (iToo Software).