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The "rule of thumb" in stereo photography for separation of cameras is 1 to
30.
One unit separation of camera lenses for every 30 units to the nearest
significant object.
Maybe what you describe is the same thing, but I don't know what you mean by
primary focus. The 1 to 30 guideline is based on a "normal" focal length,
ie. a
50mm lens on a 35mm camera. Some stereo photographers argue for a
"1/focal length" rule. In the valentine I almost doubled the 1 to 30 rule,
but
anaglyphs can often work with execessive depth.
An advantage of using an image manipulation utility like PaintShop Pro is
that you can trim
the image to adjust the stereo window (relative placement of the scene in
the z-space) to
keep most things behind the virtual window (computer screen).
HB
GrimDude <vos### [at] gulf net> wrote in message news:3c6dd696@news.povray.org...
> It used to be that this required post processing. You would take the
distance from camera to primary focus and divide by twelve to
> get the camera separation. Then, use a two-frame animation to render left
and right eye views and finally piece them together with
> DTA, which had a specific red/blue anaglyph switch.
>
> Grim
>
>
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