"Duncan Gray" <dun### [at] eclipsecouk> wrote in message
news:3b422cdd@news.povray.org...
> Haruto SASAKI wrote:
> > Now I study Stereo Matching , and I am using POV-Ray for making image.
> > So, I need distance of camera lens to image plane for Stereo Matching .
>
> POV-Ray alows you to change the distance from the camera to the viewing
> plane using the 'Direction' vector of the 'Camera' object.
>
> I still use this in preferance to the angle keyword. Most of my scenes are
> built with  direction <0,0,1.45> - this seems to give a natural kind of
> view.

Which is to say the camera needs to be farther away and have a narrower field of view
than what the
default camera provides.  A sheared camera example (using matrix) was posted before,
in which the
perspective camera does not distort the pair of renders, unlike what usually happens.
Maybe this is what is needed.
Please look at the two replies to me (Bob Hughes) in this newsgroup (general) by ingo
(yes,
ingo...) on February 19, 1999, subject line is Re: paralell lines and fisheyes
(paralell is
mispelled).
ingo posted about how to do such a thing.  I see now I hadn't thanked him for such a
great stereo
pair solution for correcting perspective.  Sorry ingo, I thank you now.  That's just
like me,
scampering along with new knowledge and little thanks to give (well, not always)  :-)
I know this was also brought up again more recently, same thing I believe.  I recall
thinking I
couldn't see the 3D effect correctly, or at least not in the way I thought looked
right.  Possibly
because I'm accustomed to incorrectness(?)
Anyhow, do read ingo's message if you can get to it.  There's also varying opinions
about how to go
about others aspects of camera placement elsewhere.  But I'm thinking "Stereo
Matching" might be
the more stringent of the 3D stereo pair realm, although I don't know about the
subject.

Bob H.

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