In this video youtube.com/watch at 1:34, you see the closing circle and opening circle for the transition? How to do that in C2?
Well, not possible to do with C2 until new effect with WebGL about circle effect. There no circle effect yet.
However, you can make a huge black sprite with alpha hole you could do animation size.
if you check out the technique used in the 'lighting' example inside program files>c2>examples
you can replace that light sprite with a solid circle that starts bigger than the screen and then gets ever smaller
preview, click anywhere
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keepee wow! i didn't know blending effects could do it.