Re: Ortho Seat

[P3D Paul Talbot <ptww@xxxxxxxxx>]

P3D John Bercovitz wrote:

> If you project the images onto a screen so that the
> images are 1400 mm high, then you need to sit 2100
> mm from the screen.  If you project the images so that
> they are 4200 mm high, you still need to sit 2100 mm
> from the stereo window (that's a fixed number because
> it is the distance to the stereo reconstruction of
> the window), but you are now 6300 mm from the screen.

As usual, I can't begin to keep up with John's insightful
analysis.  :(  But I want to ask a question anyway.  ;)

As Bob Aldridge noted (but disagreed with) most projectionists
adjust the projector so that the window is at the screen.
But in the 4200mm image height example, you seem to be saying
that the window is 4200mm in front of the screen.  (6300mm
viewer to screen distance, minus 2100mm viewer to window distance).

And then there's the whole issue of the reconstructed distance to
the window changing with chip placement in the mask...

Paul


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