Cel-shading for my game

Hi, I was wondering if anybody could help me out with this.

I've been on the gameSpace forums, trying to find some answers as to how I could have cel-shading in my game. They said that it would have to be related to the actual game engine itself, rather than gameSpace if I want cel-shading in my game.

I have searched for weeks for tutorials and methods of including cel-shading in my game, and I'm very lost on what to do for it. Could anyone help me out here?