Hello Brian,

<<<Yes, hoopsnake. I wonder if nodeeditor has "feedback" detection code?>>>

I think that's a general problem - no special code is needed. The nodeeditor needs startpoints/nodes to start the calculation from an independent node. In a closed loop we need a intial startpoint and initial value(chicken-egg-problem). At a minimum we need an independent node that defines the step in to the loop and gives the initial value. I think it's possible to solve.

Have a nice day
Karsten