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Re: tilted image
At 14:16 9/17/96, P3D John Bell wrote:
[deleted]
>
>I, too, have been curious about why a "Dutch angle" might be
>off-limits in 3-D. The best I could come up with, which seems to be
>what the good doctor is describing, is that the TILT signs within the
>image will conflict with one's internal bodily clues (inner ear?)
>of being on the level. My follow-up questions for the group are:
>
>What if the viewer tilts his or her head to one side to match the
>image's horizon? Does that produce a greater sense of verisimilitude?
>(By "viewer" I don't mean the red-button kind, of course.)
>
When you tilt your head your eyes counter-rotate around the line of sight
by several degrees. This is not a good thing for stereo viewing, as it
means that the corresponding points in your two retinas are no longer
aligned, you'll be more likely to experience double vision, etc...
>Does the same phenonmenon occur when one tilts the camera forward or
>back instead of side to side? If not, why not?
>
I've always found stereoviews looking up or down to be most convincing when
viewed at the same angle from which they were taken. On the other hand, I
don't find this kind of mismatch (e.g. viewing a slide horizontally that
was taken with the camera pointed up) to be nearly as bothersome as a tilt.
-Jim C.
----------------------
Jim Crowell
Division of Biology
216-76
Caltech
Pasadena, CA
(818) 395-8337
jim@xxxxxxxxxxxxxxx
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