"Francescodario Cuzzocrea" <fra### [at] mailpolimiit> wrote:
> Hello !!
>
> Today I was thinkering about camera reference frames and I had a little bit of
> confusion.
> Which three vectors define the frame of reference of the camera? I took as
> granted that the z direction  was the one exiting from the camera, so the result
> of the difference between the vectors "look_at" and "location". But in this way
> the "right" and "up" directions (both defined or as default) are not
> perpendicular to the z direction. So what is it? Are the right and up directions
> (and the cross product of them) the reference frame of the camera (so the z
> direction is not perpendicular to the image plane) or is it otherwise and the
> right and up direction are not defining the camera reference frame?
>
>
> Thanks in advance !!!!

http://news.povray.org/povray.binaries.images/thread/%3Cweb.5d881ea3763463c54eec112d0%40news.povray.org%3E/

http://news.povray.org/povray.binaries.images/thread/%3Cweb.5880b8311652a4dcc437ac910%40news.povray.org%3E/

The camera defaults are pretty straightforward, it's only once you start moving
things around that it can get tricky.

I would also take a look at the screen.inc file - as that has a lot of
definitions and transformations in it that can be instructive.

and links in this thread:
http://news.povray.org/povray.general/thread/%3Cweb.5b9ed475f76fb4baa47873e10%40news.povray.org%3E/?mtop=424446

and maybe you may find _something_ of use here:

http://news.povray.org/povray.binaries.images/thread/%3C5baddad1%40news.povray.org%3E/?mtop=424795

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