Bad .obj model file

[RobertATfm]

I don't know what kind of solid "dodecahedron.obj" is supposed to be, but it isn't a dodecahedron; those have 12 (pentagonal) faces (hence the name) and 20 vertices. The file "dodecahedron.obj" describes 50 triangular faces (that would be a pentacosahedron) and 15 vertices. (I find the idea of its dual, which would have 50 vertices for only 15 faces, mind-boggling.) Finally, simple numerical analysis shows that the purported solid cannot be real; 50 triangular faces means 75 edges, so this "solid" doesn't follow the rule that edges=faces+vertices-2.