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. Author manuscript; available in PMC: 2009 Sep 11.
Published in final edited form as: J Theor Biol. 2007 Feb 20;247(2):266–280. doi: 10.1016/j.jtbi.2007.02.003

Figure 2.

Figure 2

The coordinate system is centered at the root of the hair. In this example, the vector n(i) points in the direction of the negative y axis and thus the hair moves in the (x, z)-plane. The angle θ is the angle of the hair with the positive x-axis.