On Sat, Sep 1, 2012 at 7:33 PM, Gerardo @neorigami.com <[email protected]> wrote: > > In the preface Kawasaki writes: "The special techniques such as the 'twist > fold' and the '3D twist fold' are important bases for Hiraoir and > crytallographic origami..." Can you explain to me what does he mean by 3D > twist fold? Is it the same kind of fold as the one used in Jeff Beynon's > "Spring into Action" model? If not, does that kind of 3D twist fold have > another name? > > "Roses, Origami and Math" in Google Books: > http://books.google.com.co/books?id=P88KFwMzXQ0C&pg=PA10&lpg=PA10&dq=%223D+twist+fold%22&source=bl&ots=kShV-uPTbG&sig=qUJPE9j10a8rx3bm2uMJBQBud-A&hl=es#v=onepage&q=%223D%20twist%20fold%22&f=false > > Spring into Action: http://trumbore.com/spring/ >
Hi Gerardo, Spring into Action isn't a twist fold at all-- it's a corrugation. There's no central polygon that twists, so you shouldn't call it a twist fold. Philip Chapman-Bell started using the term "iris closure" to talk about this mechanism, I think it's probably the best option. When he says "3D twist fold", Kawasaki is referring to models like his rose, where the pleats of the twist fold become three-dimensional and wrap around the central polygon. He uses the term again on pages 116 and 118, in reference to the Rose Bud model diagrammed there. -- Andrew ______________________________ http://www.flickr.com/photos/ahudson http://ahudsonorigami.wordpress.com/
