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Flash actually can do very similar things with their IDE via Object Tweens. And yes in flags you could edit the interpolated frames and "adjust it" However, at least with my experience with flash, the interpolations never did exactly what you wanted, and this tool seems to better predict what is desired.

With that said, despite being free I am not sure if VPaint interface is that much better than Flash.

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From my experience, Object Tweens "never doing exactly what you wanted" is an understatement - they're pretty much useless for any non-trivial shape, not doing anything remotely sensible.

There seems to be a lot of room for improvement in 2D interpolation, and their video shows stuff that looks impressive enough. I'd have to try it to form an opinion, of course... I hope I will find the time

Flash doesn't support shared edges or multiway joins which sound pretty crucial for non-trivial animation work. VPaint is based on Vector Graphic Complexes (http://www.dalboris.com/research/vgc/) which supports both.

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