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Nghệ thuật xếp hình Nhật Bản: polyhedra

Nghệ thuật xếp hình: polyhedra. Tài liệu rất có ích, nó giúp bạn nâng cao kỹ năng gấp tất cả mọi thứ bằng giấy. Bạn có thể gấp thành thạo những gì bạn thích cho riêng mình và cho bạn bè bạn. | Penultimate Polyhedra James S. Plank Department of Computer Science University of Tennessee 107 Ayres Hall Knoxville TN 37996 plank@cs.utk.edu http www.cs.utk.edu plank plank origami origami.html March 28 1996 Introduction These are some notes that I originally hacked up for my sister. They describe how to make polyhedra out of the penultimate module. This module is originally described in Jay Ansill s book Lifestyle Origami Ans92 and he attributes the module to Robert Neale. I have omitted how to put the modules together - buy the book or figure it out for yourself. It s pretty obvious. The pentagon module is pretty much lifted straight from the book although I ve found 3x4 paper easier to work with than 4x4 paper but the others are my own tweaks. A note about cutting and glue. The triangle and square modules as pictured have cuts. These are not necessary you may use inside folds to achieve the same purpose i.e. the tabs that you are inserting would be too long or wide otherwise . When you do use the inside folds the tabs become thick and it takes more patience to get the modules together. Also the resulting polyhedron is often less stable. However the choice is yours. If you care more about the purity of the art form i.e. no cuts or glue then that is achievable. I d recommend the dodecahedron and truncated icosahedron as excellent models that are very stable without cuts or glue. However my personal preference is to cut them and glue them once I m finished. This is because otherwise the larger polyhedrons tend to sag after a few months. Gluing has the additional benefit that the polyhedrons are more cat and child proof. This method of making modules lends itself to many variations besides the ones shown here. All you need is a calculater with trigonometric functions and you can figure them out for yourself. Besides the Platonic and Archimedian solids I have made various others rhombic dodecahedron rhombic triacontahedron numerous prisms and antiprisms stella .