Contour Wireframe

So here's how to create wireframe renders in Maya using mental ray and contours. It can also be done using the hardware renderer but this is much easier and you get a better result.

1. Create a material for your object.
2. Call the new material WireFrameMTRL and the shading group WireFrameSG.
3. Go to the shading group, click the mental ray tab -> Contours tab.
   
4. Click enable contour rendering.
5. Set the color to whatever you want.
6. Set the width to whatever you want, a good place to start is 0.5 (this is for the wireframe lines).
7. Apply the material to the object.
8. Open Render Settings
9. Select Mental Ray as your renderer.
10. Under the Features tab scroll down and expand the Contours tab.
11. Select Enable Contour Rendering.
12. Open the Draw By Property Difference tab.
13. Click Around All Poly Faces.
14. Render! (May want to test render to make sure the wireframe lines aren't too chunky or too small).