6 Jan
2013
6 Jan
'13
9:42 a.m.
A usual trick in modeling 3D surfaces is to "triangulate" them with triangles that could in principle be hooked together with hinges. Q. Is it possible to "quadrangulate" a 3D surface with _only_ (planar) quadrilaterals "hinged" together ? (A quadrilateral has to have 4 non-trivial sides, so no triangles as limiting cases.)