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Some examples could be the animations framework used in Aquaria, or in Crimson Legend.

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Could you clarify what you mean by that? Simply hierarchical transforms? Some sort of skinning? Ragdoll? IK? – Rachel Blum Jul 15 '10 at 19:05
I am looking for something simple, no rag dolls, no inverse kinematics, only animations made with a skeleton and key frames, in 2d. I think that what I really want to know is which format is used for those kind of animations and if exists an application and/or a java library to edit and load them, respectively. Thanks – arielsan Jul 16 '10 at 3:50
up vote 2 down vote accepted

Most developers simply create their own tools; there is no standard format that I know of.

Part of the reason for that is it's a relatively straight-forward task once you have written the code to display such a keyframe. It's a trivial step from that to add some basic functionality to move and rotate each bone, and save the set of transforms as a keyframe. From there, you need only add some controls for the timeline, and you have yourself an editor!

That said, I was able to find this editor, though you'll have to write the loading routines yourself:

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It's probably not what you're looking for but JME has support for skeletal animation:

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I know jmonkeyengine, I have used it in the past, but it is not what I am looking for right now. Thanks for the answer. – arielsan Jul 15 '10 at 17:38

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