All you need to build such a complex object is one spline Watch this video before doing anything: https://youtu.be/XFqBG1LRF8E ................... And watch this one for setup the preset in RailClone: https://youtu.be/ObbW5-2n7L4 .................. 3DS Max 2015, Corona 5 3DS Max 2015, Vray 5 Rail Clone Pro 3.3.1 .................... Files Saved as 3dsMax 2015 but .mat file saved as 2018. I'll try to fix it soon. I used corona 5 and Vray 5 and And I do not know which lower versions are supported