Darkened Text Edge Effects

By using the Proximal Shader, you can reference the text polygons points and vertices to drive the gradient that is applied to the texts edge. Then I’ll show you how to use it in conjunction with global illumination to make it look like your glowing text is casting light in your scene.

http://eyedesyn.com/2012/04/02/darkened-text-edge-effects-in-cinema-4d/