Vic,

Great precision in stereo base calculation is not necessary.
Stereo photographers rarely need to resort to complex
equations, the 1:30 rule is more than enough unless extreme
lens focal lenghths are involved.

By "vector between the two eyes" do you mean convergence?
Again, parallel cameras is your best solution, but if you do
"toe in" or converge the cameras then you do need to be
precise. You will also need to limit the depth of field because
what is sometimes called "on screen deviation" (the displacement
of left and right images on the screen) may cause the eyes to
diverge (rotate out) which is very uncomfortable!

I've never created an difficult to view stereo pair result from
using the 1:30 rule and parallel cameras.

HB

Vic <let### [at] fwhu> wrote in message news:3ccd9bb0@news.povray.org...
> Important:
>
> I've tried to replace look_at with my own mechanism to get rid of keystone
> distortion. I've faced a vector rotation problem, where the base angle of
> the rotation had not been determined. I've recognized, that not only
> stereo_base (the distance between the eyes of the viewer in the
appropriate
> metric)  important, but the direction of the vector between the two eyes!
> This is the base (zero degrees) of the camera rotation around the distance
> vector (the roll of the camera as I know).
>
> With the "monoscopic" camera model this was not an issue, because this can
> be corrected by trial and error camera placement. With stereoscopy this
must
> be the result of precise calculation, otherwise the left and right images
> stress your eyes and brain. This could be the source of most stereography
> problems arised using PovRay.
>
> Hermann and Harold? What's your opinion about the issue detailed above?
>
> - Vic -
>
>

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