Hair movement in cel character animation is sometimes
inconsistent. For example, there may be inconsistencies
in the number of strands or locks of hair, as can easily be
seen in the images in Fig. 1. The representation of hair is
thus a specialized work in cel animation. In fact, Cartoon
hair representation is very difficult to achieve in computer
graphics. This is because all of the hair attributes
may not be consistent between camera positions. Although
physics equations can be used to obtain physically
correct movement, it is not always the movement
for which the animator is looking. Since the movement of
hair in cartoon animation sometimes carries meaning, the
animator may be looking for something that exists only
in his or her imagination. This means that the characteristics
of the hair (modeled shape, number, etc.) between
key frames may actually have not to agree. Even though
the frames are physically inconsistent, the results can be
quite convincing. This is the most difficult part of creating
cartoons using computer graphics and is the reason