I'm trying to move a picture with jit.rota using the offset arguments. This picture is composed with a circular zone, then passing thru a circular mask. How can I keep the playing picture inside the surface of the mask. I think there should be a way to do this mathematicaly, but the problem is that my math skill sucks (furthermore, I'm quite new to Jitter so maybe I went the wrong way). Any help would be greatly appreciated.
As I realise my explanations are perfectly unclear, here's a demo patch using countdown.mov as an example.
Thanks in advance.