On 11/06/2012 9:53 PM, Thomas wrote:
> What I am struggling with is the bit where the shutter has to rotate and follow
> the groove. Any ideas how this can be achieved?

Hi Thomas, I have not looked at your code but I have an idea that you 
might be able to adapt.
Some years ago I did something similar for a TC-RTC animation. I used 
splines to control the motion. In the animation below (it is cyclic and 
should be viewed as a loop) each row is unioned (if that is a word). The 
unions can be translated then rotated. This should give you the motion 
required.

http://youtu.be/7BmtOe-8n0E

-- 
Regards
     Stephen

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