Expressive rendering

Abstract

The ultimate goal of computer graphics is to make the rendered image effectively convey the visual content that can be effectively recognized by human beings. Almost all physical surfaces contain some microstructure or texture visible to the human eye. It gives us information such as the type of material which composes the object and the relative smoothness or coarseness of the surface. Therefore, texture is an important surface characteristic which provides a great deal of information about the nature of a surface, and here are three characteristics of texture which provide this perceptual information: size, shape, and density [Schweitzer, 1983]. Perceptual psychologists have recognized the importance of surface texture as a cue to space perception, and lots of perceptual principles are newly developed for computer graphics [May, 2000].Changes in these components due to standard perspective and projective transformations provide knowledge about surface depth and changes in the orientation of the surface.