What are heightfield fractals?
As has been stated above, it is possible to represent some property of the behavior of each point by a number. So each point is defined by 3 coordinates: the real and imaginary parts x and y, and the number representing the behavior of the point (which is usually coded as a color). It is also possible to use a 3D visualization, this number being the height of the point, providing that the position of the observer is specified. This can be combined with the use of a color map and ray tracing.