There are several loop plugins (Hoopsnake, Anemone), but all of them only seem to be offered for Rhino 5. Is any of these plugins working in Rhino 6? Or are there any other alternatives?
As for what I am trying to achieve:
I am working on a bridge, which is based on a curved arch. There are stairs between the bridge and the groundfloor. The location of the stairs is chosen relative to a point on the arch. Since the point on the arch is dependent on the length of the stairs, which depends on the heigth of the bridge, which in turn depends on the point relative to the arch, a recursive data stream occurs for the number of stair threads.