Can cycles Wireframe Input be coerced into displaying Tris, Quads and Ngons edit 2 years later: Here is an alternative answer that meets the desired end-result using FreeStyle.



Is there a way to make the wireframe input show the geometry as BMesh polygons instead of the raw triangulated mesh? The example below displays the wireframe of a mesh in edit mode (as you can see it doesn't have any triangles).



When I render the mesh it appears triangulated, but being able to show quads and ngons (instead of only tris) would be more useful to me.
As of yet it hasn't been implemented. Although there was no specific mention of improving the wireframe node, Thomas Dinges is working on some Cycles things this GSoC. I think it's just a matter of time before he, or another developer, gets to it.