Re: Single lens 3D questions

[P3D John Bercovitz <bercov@xxxxxxxxxx>]

> By the way, another artifact I've noticed is "cardboarding," 
> the illusion that the picture is composed of different planes 
> of objects at different distances, rather than continuously 
> varying depth.  Is this also a Q-dos-specific problem?  What 
> would cause that?

Here's the answer:

Larry Berlin wrote:
> It [cardboarding] has to do with a situation where there is
> sufficient parallax to determine the relative placement of
> various subjects within the scene, but insufficient parallax
> visible to see roundness or relative depth of [within] each
> individual visible subject.

The way this applies to Q-DOS (forgive me, WJC) is that the
separation of the viewpoints is low so the parallax is low.
It's still enough to tell if a person at 10' is closer than a
star but not enough to get much depth _within_ the image of 
the person.  This is it's weakness but it is also its strength: 
when you do closeups, you need less parallax or you won't be 
able to maintain fusion.  Other forms of single lens are used 
in medical work and microscopes and solve otherwise tough 
problems.

John B


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