In the render globals, select mental ray as your renderer

Set all of the common settings (see render settings tutorial here)

Under the Mental Ray tab
- set Quality Presets to Production
- Under General - check enable Contour Rendering check hide source
- set flood color to black set oversample to 40
- set Filter type to Gaussian
- set Filter Support to 2.0
- check "Around Poly Faces"

Create a new Lambert Shader in the Hypershade window

In the hypershade window, go the Graph-> Input and output Connections Select the Lambert2SG, and press control-A for the Attribute Editor

In the attribute editor for that shader group, under Contours
- check "enable Controur Rendering"
- set the Color to white Set the Alpha to 1
- set the Width to .3 (this adjusts the thickness of the mesh)

Apply this shader to the object and Render