I can only see tris. It's quite rare to see .obj files with anything except triangles.
Or do you mean something like "contains implied ngons because of the way coplanar tri faces are arranged"?
Or do you mean something like "contains implied ngons because of the way coplanar tri faces are arranged"?
Further more you would only allow quads to meet in 3, 4, or 5 edges per vertex. The 4 edges per vertex is the "normal" case that most of your mesh should have, it causes a regular grid of parabolic (euclidian) geometry with neutral curvature. Then patches of these meet in vertices with 3 edges to make it elliptic geometry with positive curvature or 5 edges to make it hyperbolic geometry with negative curvature.
You can ignore all of these and just randomly connect nearest neighbors to form triangles. But, then you still have only geometry, no useful topology, so not any better than a point cloud. A good topology is necessary for texturing, skinning, animation etc.
> In 5 of my 10 test there were n-gons. There are always starfishes with 5 or more connected verts.
Ok. So you are basing your definition on the number of edges that meet at a vertex. My understanding was that the important metric was "number of edges on a given face"