Sigmund,
Alright, I realize my last message didn't really answer the question- why.
Well, when we look at things in the distance (infinity) the line of
sight of each eye is parallel. It is still pretty much parallel at
195cm. Given an average human eye separation of 6.5cm that works out
to be 1:30. When we look at things closer than this our eyes converge
(cross). So if the cameras are still parallel they will not provide
the same image as our eyes would when we look at things closer than
195cm. To recreate the effect of looking at a close object you would
need to angle the cameras toward the center. I don't know the formulae
to calculate that, so I just use the 30:1 rule. You should also be
aware that the separation used in creating the images directly
effects how large the object seems to be. Hence, if you use the 30:1
rule to make a stereo image of an insect, and the insect fills the
image area, it will appear to be a very large bug!

Harolddd

Sigmund Kyrre Aas <as### [at] studntnuno> wrote in message
news:387E0D16.FE6D484F@stud.ntnu.no...
> I just crammed a stereogram out of an unfinished scene of mine.
>
> Just wondering; shy can't I use 'actual' eye distance? I tried 7 cm
> between the cameras, but that produced far too different images. This
> one uses 1 cm and the camera is ca. 50 cm away from.
>
> sig.


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