Rendering Nonphotorealistic Strokes with Temporal and Arc-Length Coherence

Nonphotorealistic Rendering (NPR) deals with representing pictures and animation in, as the name suggests, a nonphotorealistic fashion. While there is only one way to render a photorealistic image, in an NPR system we have the freedom to represent it in an unlimited number of ways. By varying the style of rendering, the image composition and the level of detail, by omitting or emphasizing certain parts of the drawing, we can direct the viewer’s attention and convey a bias -something that is not possible in photorealistic rendering systems.