I think you could model each segment as the difference between
two discs (or scaled spheres).  I don't have a handy example, but
think of a small disc minus a larger (but offset) one... you should
end up with something like a crescent moon.

As for getting them to fit together right, start by making some
assumptions about the distance between the center of the
iris and the center of each disc.  You might find some cool
relationship that allows you to animate, but you didn't say
you were going to animate, so maybe I am just running off
at the mouth again...

Rune S. Johansen wrote in message <36645109.0@news.povray.org>...
>I'm making a spacecraft and I want a special gate/door in it.

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