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.
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Flip the normals and extend the edges of backfacing polygons.
Add thin quadrilaterals at each edge, forming an angle with the polygon.