Zippable Bunnies

Christian Schüller, Roi Poranne und Olga Sorkine-Hornung von der ETH Zürich haben Hasen erfunden, die man mit einem Reißverschluss konstruieren kann. Klingt komisch, is aber so. (Es geht tatsächlich um eine Methode, jegliche Objektformen mit „reißverschlussartigen Mechaniken“ formen zu können. Funktioniert also nicht nur mit Hasen, sondern mit allem.)

Paper: Shape Representation by Zippable Ribbons (via Improbable Research)

Shape fabrication from developable parts is the basis for arts such as papercraft and needlework, as well as modern architecture and CAD in general, and it has inspired much research. We observe that the assembly of complex 3D shapes created by existing methods often requires first fabricating many small flat parts and then carefully following instructions to assemble them together. Despite its significance, this error prone and tedious process is generally neglected in the discussion. We propose an approach for shape representation through a single developable part that attaches to itself and requires no assembly instructions.

Our inspiration comes from the so-called zipit bags [zipit 2017], which are made of a single, long ribbon with a zipper around its boundary. In order to “assemble” the bag, one simply needs to zip up the ribbon. Our method operates in the same fashion, but it can be used to approximate any shape. Given a 3D model, our algorithm produces plans for a single 2D shape that can be laser cut in few parts from flat fabric or paper. We can then attach a zipper along the boundary for quick assembly and disassembly, or apply more traditional approaches, such as gluing and stitching. We show physical and virtual results that demonstrate the capabilities of our method and the ease with which shapes can be assembled.