LIGHTING MODELS FOR NPR
In this chapter, we will explore lighting or illumination models as a method to modify systematically the appearance of images. By way of motivation, we will start by looking at sample images that were drawn by hand by scientific illustrators and artists. We will see that though the lighting effects are not straightforward, many of the effects that can be observed can be traced to a handful of effects that can be incorporated in a lighting model for NPR. While in photorealistic rendering the lighting models are based on physically determined relations between light sources, objects’ positions, and surface materials, we have more liberty in NPR to obey the laws of physics or not. Nonetheless, well-established lighting ...
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