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Le 16/10/2015 15:09, CAD-Andi a écrit :
> Can somebody give he a hint and nudge me in the right directon as
> far as how i could achive this?
> 
> The input variables for the wikipedia formulas are "f=focal length"
> and the angle under which the "ray" hits the focal point. The
> result "r" is the distance measured from the new point on the
> projection screen to the perpendicular center from the focal point.
> All this is calculated of course in a 2D plane. To project 3D
> Points in CAD I just had to stay on this plane, rotated around the
> "optical axis" So, in a sense I work with a hybrid of kartesian and
> polar coordinates to get the point on the virtual CAD screen.
> 

Thanks you for explaining the formula.

> Anyway, any help or general thoughts on using any of these
> mathematical projection methods or even real world camera formulas
> is welcome.

Povray has a fisheye camera,

http://wiki.povray.org/content/Reference:Camera

If I got it right from the code (tracepixel.cpp), the fisheye of
povray is wikipedia orthographic : r = f.sin(theta).
(in the code of povray, the computation is done the opposite way: you
start with r (named rad), compute theta (named phi) and use that phi
as the angle of the ray from the focal axis.



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