Computer graphics that use CAD software are often good for creating representations of artificial objects using primitives such as lines, rectangles, polygons and 2D curves, or 3D boxes and surfaces. These geometric primitives and the usual tools to manipulate them are typically inadequate when it comes to representing most of the objects found in nature such as clouds, trees, veins, waves and a lot of mud. There has been considerable interest recently in chaos theory and fractal geometry, as we find that many processes in the world can be accurately described using that theory. The computer graphics industry is rapidly incorporating these techniques to generate incredibly beautiful images as well as realistic looking natural structures.
In what follows a description of some of the most commonly used techniques will be given along with an example of each. It should be noted that normally the example is one of an image with a large if not infinite variation depending on the parameters, scale and display position.