REQUIREMENTS: Max 2016 + Extension 1/2 + SP3, Max 2017 (for 2018, please read below)
Installation: Scripting, Install Max Creation Graph...
This MCG will curl a Spline, multi curve splines.
Works with both Max 2016 and 2017, although in 2017 you'll get deprecation messages, it will still compile and run.
Please note: This MCG works with Max 2018, however, due to incorrect auto-conversion in Max 2018, the Official Installation procedures will fail. I have no control over this, it is Autodesk's fault.
To get it to work with 2018: (close Max)
01) extract file Vu_CurlASpline.mcg
02) rename Vu_CurlASpline.mcg to Vu_CurlASpline.zip (yes I know this is a bit confusing)
03) from Vu_CurlASpline.zip, extract all (including subfolders) to:
C:\Users\yourusername\Autodesk\3ds Max 2018\Max Creation Graph\Tools
Open Max 2018, tool can be found in Create>Shape>Vu
So it works fine with 2018, it is simply the Official Installation process that is faulty.
Ver 1.20: added Curl Axis so now you can curl vertically (Y axis) or flat (Z Axis)