jiangzhijun nous apporta ses lumieres en ce 2005-12-30 04:42:
>  Hello Everyone:
>        I am doing experiments to try to recover the focal length of the
> perspective camera,for illustration,I do some experiments on the image
> sequences generated by POV.
>        here is my camera: it is translating along the axis +x,always look at
> a fixed point <0,0,1>,always set the horizontal view angle to 53;
> //===============================================
> camera {
>     location <0, 0, -16>
>     right x
>     up    y
> 
>     translate x*(clock*6)
>     look_at   <0,0,1>
>      angle 53
>   }
> //.............
> //.............
>         So,I would like to ask whether the camera focal length of  the
> result sequence equals 1 in every image frame. if not,how can i get such a
> image sequence then?Thanks!
> 
> 
That camera DON'T have a focal lenght! It's similar to a pinn hole camera: infinite
focal deeph. It 
does have a field of view that you set at 53 degrees and that field of view will never
change unless 
you specificaly change the angle.

-- 
Alain
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