ABSTRACT
This chapter discusses several techniques which can be used to create Non-Photorealistic Rendering (NPR) images. Traditionally the goal of computer graphics is to generate realistic images, the more realistic the better. Also educational programs for kids and computer games may benefit from using non-photorealistic rendering. Just in the last few years several games using NPR were successfully published. One of the simplest non-photorealistic styles is cartoon rendering. It is characterized by having several discrete levels of brightness with a clear border between them. There is a modification of cartoon rendering which uses lookup texture, a two-dimensional-lookup texture. Watercolor drawing is a simple drawing style which can be implemented using shaders. It is based on modeling different layers which are later mixed together.
