This is my personal mini project for learning vellum to drive some dynamic strings. 

Render by Redshift for using point attributes to drive the emission while collision in the dark part.

I tried to use the simple curves as the constraint to drive the dynamic, it was quite handy to contral and simulate(15 Secs). After cache the curve dynamic data, they can be used to generate those pipes. The pipes' radius are related with the curve point pscale(thickness in vellum contraint), so they would seem to be collided each other exactly as they look.

Thanks to the Houdini 17.5 PDG feature, it allows cache data by multithread in different parameters or timeshift. It bring the speed up to 10X above base on your CPUs!