algorithmic modeling for Rhino

unrolling polygons in grasshopper?

I would like to unroll a series of irregular icosahedrons (12 vertices,20 sides) in grasshopper, to make a net. The reason i was going to do it in grasshopper was because I need to make an animation that relating to variable slider values, (using the amazing centipede plugin). I was thinking that something like this would have been done before. But I'm not sure where to start looking... Any ideas?

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Permalink Reply by Andrew Heumann on June 4, 2011 at 11:34am

you've got a couple options. If the basic unroll command from rhino is sufficient, and you have Rhino 5 and ghpython, Steve Baer's python script will do the trick, with a little modification; just remove the "[0]" after breps in line 8. If you need a little more control (or don't have Rhino 5) I wrote a definition to do unfolding of continuous strips of surfaces available here. Not sure off the top of my head if the topology of an icosahedron lends itself to a continuous linear net, but the definition hopefully will be at least someplace to start.

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