Grasshopper Express – shutter

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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