folding shutter.
In Grasshopper, there are no really good solutions for inverse kinematics. This is a major issue for many articulated mechanisms. In this example, we will see how to create an animated folding shutter without using angles and instead using the movement that we would do in real life. 
Start by creating 2 points. The highest one is the one where the folding shutter is hanged, the lowest one corresponds to the handler.
Create 2 circles
Find the intersections
Il will be necessary to isolate one of the points. If not, the solution will swing from one point to the other.
Let’s connect the cercle centers to the intersection. Beware of giving a logic order.
The system is finished. It’s now designing the Shutter.
We can offset the curves
Which is not working with Rhino 6. In Rhino 6
Some finishing
To segment the shutter
Divide the 2 lines used for the loft
Partition the list to take 5 lines, leave one.
The definition can be found here for RH6 and here for RH7
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Devoir trés interessant qui aide a developper les compétences grasshopper
constantly i uused tto read smaller articles oor reviews which also clear their motive,
and that is also happening wirh this piece of writfing
which I am reading now.