In this tutorial I will show you how to render with edges in vray renderer. Is a simple tutorial but for some may come in handy

First we will make a plane and place teapot object

Now choose a new Vray material and for diffuse select VrayEdgesTex

You can adjust the thickness of wires

Here what it looks like with a simple rendering, just an omni light above casting shadows, no special illumination here

I have also rendered a red version of the teapot without edges, so that we can compose this in Photoshop

Open Photoshop, and drag the teapot with edges over the red teapot image

In the blending type choose screen

Now you can add a layer mask for the Layer 1

and if you apply a Gradient Fill, you will obtain this