
SubSpline is an Advanced Subobject Selector & Material IDs Editor for spline shapes in Autodesk 3dsMax.
With this plugin, you can edit your shapes way faster, using its smart and efficient tools for selecting vertices, segments and spline subobjects.
SubSpline is also the perfect tool for managing the material IDs in your splines, due to its extensive set of functions ment for this porpose.

Some tools in this plugin work only in subobject level (like the ones in Select Subobjects section), while others can work both at base or subobject level. See the image above.
SubSpline was ment to work in parallel with 3dsMax Editable Spline tools. You can switch between the different subobject levels directly from the script’s UI, with the vertex/segment/spline buttons, at the Main Panel.

Vertex/Segment/Spline (icon buttons):
These 3 check buttons are clones of the ones in Editable Spline parameters and have the same function: enable or disable the corresponding subobject level edition.
When active, all the controls in Select Subobjects section become enable and ready to operate.
You can hold CTRL+button to convert the current subobject selection to a different type (like you do in 3dsMax Editable Poly).
Select an editable spline shape and start playing with SubSpline tools. The pugin is very intuitive and easy to learn.
You will really speed up your workflow and reduce your spline editing times by half.
If you are a user of iToo Software RailClone plugin, SubSpline will open a world of exciting new possibilities for you. It’s a great tool to manage spline material IDs, fast and efficiently.
Here’s a great RailClone & SubSpline Tutorial.
For further information and detailed description of every tool in this plugin, please check the SubSpline Manual.
Cheers!