COMP 238 Final Project. Non-Photorealistic Rendering Techniques for a Game Engine. Remember NPR Quake?. How did they do it?. “grep”-ed the Quake source code for OpenGL calls Pulled them out into one source file Added dynamic loading support Started coding different visual styles.
Flip the normals and extend the edges of backfacing polygons.
Add thin quadrilaterals at each edge, forming an angle with the polygon.