| Probably not. By "z-buffer rendering", you probably mean a scan-line 
| algorithm which would be very difficult or impossible to apply to POV, 
| which is a pure raytracer. 

Could the vista buffer be used in such a way?  Perhaps a z-buffer
post_process op?  I wasn't suggesting that you do this *while* the render
runs, but afterwards.  As for the memory hit, only one hair is in memory at
a time, so there is no large memory hit.  Also, you might want to download
the demo.  It really rocks, and gives a better idea of how these hairs are
made.

H.E. Day
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