>  well,I'd like to put forward a question,"How to Calculate or know the Focal
> Length of the perspective type Camera in POV-RAY3.6",can anybody be so kind
> to help me? 

WHile it is possible to include a lens into the rendering process, 
normally a pure raytracer implements a so called pinhole camera. As
such there is no focal length, everything from 0 to infinity is in
focus.

-- 
Paul Bourke
pdb(NOSPAM)swin.edu.au

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