On 4-4-2016 14:58, Stephen wrote:

> Proof of concept.
> It needs more work on the inner cylinder* and the masking.
> It is short and cyclic. Probably better to download it and watch it
> looping.
>
> https://youtu.be/21Tb8_HIDp8

Yes, that looks like it I believe.

-- 
Thomas

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