Just been mucking about with Spine to assess how easy it is to make animations for a possible future iOS storybook app. I have to say I've found it very very nice to use π!. I've used a lot of animation software and Spine seems to be pretty exceptional.
wave animation
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idle blink animation
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(these gifs might play a bit slow in some browsers (IE) cause they playback at 60fps)
Two feature suggestions I felt myself missing quite a bit though:
1) Skew transform
The vast majority of animation software I use (eg flash) allows for skew transformations on objects. This is really important for enabling the animator to squash and stretch elements properly. With Spine the way it is now, I can only squash and stretch in a way that is aligned to the objects axis. When skew is available it's possible to stretch something diagonally too. Working without this feature feels pretty restricting.
2) More than two key frames in the graph editor
This is less important but I found myself missing this. I think it would be awesome if I could select multiple frames on an objects rotational timeline for example and be able to see all those key frames in the graph editor an be able to assess their relative values visually. I don't think flash can do this either but maya and after effects can and it's a feature I find myself using all the time when it's there.
Other spine looks fantastic π. Great work!