I'm not sure I follow all that. You describe the blades as "semicircle,"
while the ones in my wife's camera (which I'm trying to duplicate) are more
like shark fin shapes (I think, anyway, I can only see part of them). I also
tried twisting the blades a little to get the overlap, but that just caused
other problems. I was starting to think that there needed to be some
sliding, you're certainly correct that it's more complicated than it first
appears!

May I see your code? I'm amazed that you were able to succeed so quickly...

Thanks for taking the time (again!) to take a look at this.

Regards,
Dave

"Bob Hughes" <per### [at] aolcom?subject=PoV-News:> wrote in message
news:3972e411@news.povray.org...
> Well, I have rendered one now, animated too.  Like to see?  I hesitate to
show
> either the mpeg or the pov script since you might want to be going it
alone
> there as much as possible.  For right now I can say that I found
translating a
> disc with a wide opening over to one radius and rotating partway around
then
> translating back again does work.  Just needed to also rotate a slight bit
in
> the x and y first thing in order to get a good overlap later.  Then it's
only a
> matter of applying a specified amount (multiplied by clock) of rotation
again
> to turn the whole thing opposite the first rotation (which was also done
with
> clock aside from the while loop amount) so it acts like the aperture I
have
> here.  Not exactly, but pretty close to it.
> There was a bit more to it than this but it wasn't trigonometry either.
> I won't blame you if you need to see some actual code, it's one of those
> flip-flop kind of things to reason out for me anyway.
>
> Bob
>
>
>

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