Inspired by the work of Elisa Strozyk, I wrote a script, that imposes a specific length to all edges of a given mesh. For triangulated input meshes, this results in equilateral triangles as faces. Download the python script for Rhino here.
The final geometry is a discrete representation of a crumpled developable surface, if the mesh is consisting only of nodes with the valence of six and of triangular faces. More digitally crumpled surfaces by Tamahiro Tachi on flickr.
3 days ago