The Fur shader has been used to simulate fur. However, it can be used for a variety of other materials. It works very well for materials that are naturally made of multiple layers, such as forest canopies, fuzzy clouds, human hair, and even grass.
Some additional examples of the same shader being used by just tweaking the parameters can be seen in the book's example code:
There are many other improvements that can dramatically increase its realism. You can add a very simple wind animation by changing the direction of the gravity based on the current time. If calibrated correctly, this can give the impression that the fur is ...
