Modeling dynamic hair as a continuum

In this paper we address the difficult problem of hair dynamics, particular ly hair-hair and hair-air interactions. To model these interactions, we pro pose to consider hair volume as a continuum. Subsequently, we treat the int eraction dynamics to be fluid dynamics. This proves to be a strong as well as viable approach for an otherwise very complex phenomenon. However we ret ain the individual character of hair which is vital to visually realistic r endering of hair animation. For that, we develop an elaborate model for sti ffness and inertial dynamics of individual hair strand Being a reduced coor dinate formulation, the stiffness dynamics is numerically stable and fast. We then unify the continuum interaction dynamics and the individual hair's stiffness dynamics.