"Incidentally, this would be something that would be more likely to show up with a triangulated mesh. Right?" ...not necessarily, as it really has more to do with which app wrote the .obj file and compounded by how the model was created and/or broken up into material zones, during or after creation and/or wether the mesh was created as all triangles or triangulated later, etc. However, you are correct in the sense that, since a triangulated mesh DOES have twice as many polygons as the same mesh made up from quads, there is certainly more potential for fragmentation.

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