Computer Graphics

Chapter 19

Non-Photorealistic Rendering (NPR)

19.1   Cartoon rendering

19.2   Extended cartoon rendering

19.3   Gooch lighting model

19.4   Watercolor rendering

Traditionally the goal of computer graphics is to generate realistic images, the more realistic the better. But there is an area in computer graphics whose goal is just the opposite – creating images which look like they were drawn by an artist.

This area is called Non-Photorealistic Rendering (NPR) and it aims to model or mimic various drawing and painting styles and create images and movies in these styles.

There are areas where photorealism is not wanted. Such areas include disciplines like engineering and medicine, where the specific drawing styles were established many years before ...