Tim Nikias wrote:
>>For now, I'm going to vary the focal length of the camera to see if it
>>is related, but seems it is not the source of error. I've read from this
>>newsgroup that the pov-ray unit is not related to the real world unit
>>(centimeter or meter). Would it be the source of the error?
> 
> 
> Though a POV-Unit is not "standardized" in any way to be either cm, or
> meter, or mile, or whatever, this doesn't mean that the usual physics don't
> apply (as in parallax effects, angles, distances, etc). It's just that you
> can't tag unit = cm. Just think about it, even cm is just an arbitrary
> dimension someone has thought up someday.
> 
> So it just depends on your scene-file if unit=cm or unit=meter or unit=?.
> That just means you've got to multiply the distances with some factors.
> 
> As for the 40cm deviation: is that only happening on the POV-Ray images?
> Could you post a comparison image of photo vs Pov-Ray image with markers to
> p.b.i?
> 

Thanks for the comment on my problem. But just a silly question...
what's p.b.i???

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