I admire your efforts to achieve realism, I think that they are very laudable.  I think too, that you have made a very positve suggestion here -one that's very inovative.  But my question is, how well could this be used in an animation, or is ti best used only for still rendes.  You said that you needed to readjust the hair for each focus, so how would that work in a situation of constant motion?  Could possibly a pyton script be written to automatically readjust the hair of each camera angle and focus?
DPH

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