Adding more attractor points

Hi all!

I was trying out some of the definitions I found on the net, and this one is from au-urbanfuture.org.

Here there is one attractor point that makes the straps rotate, however I would like to add some more, but there is SurfaceCP there, it allows only one point. I tried some other things to use instead, with no result and I'm stuck here because of being just a beginner on Grasshopper.

If you can help, I would be thankful.