zorro nous apporta ses lumieres en ce 31/07/2006 10:37:
> Hi everybody.
> I find POV-ray very useful to test my computer vision algorithm.
> However I don't understand how focal length works. In particular after
> rendering my image I need to get the rays back from the image pixel, or
> better, given a image pixel at coordinate (x,y) of the image, I want to
> associate to it the relevant ray that passes through the pinhole of the
> camera (namely, its 3D equation).
> 
> For my preliminary experiments I use the simply standard camera
> camera
> { location <0, 0, 0>
>   direction <0,0,-1>
> }
> 
> So I was wonder what is the value of focal length (1?), so that if I have
> the pixel in (15,12) in the image (with the origin set in the middle of the
> image) what is the equation of the ray associated to that pixel? How this is
> also related to the resolution of the image?
> 
> Thank you.
> 
> Simone
> 
> 
The default camera is similar to a pinn-hole camera. Pinn-hole cameras don't 
have focal lenght because they don't have any optics.

-- 
Alain
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