First I'd like to say Spine has really made my life so much easier now. I had done traditional pixel animation for awhile and it is very time consuming, but Spine makes a good chunk of the work really and I mean REALLY simple, easy, and time efficient. Now on to the the animations !!! These are just a few of the creatures for the game "Vitality" by MantaGames. http://vitalityrpg.com/. After switching over to Spine in the last year it really has opened up a lot of options for me as a Pixel artist when it comes to animations (as well as the project I am currently involved with). Which even as small pixel art as these creatures are, it just works wonders on them I can't praise Spine enough over it.
Postosuchus seen in the "Stone Age" part of the game.
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Coelophysis also seen in the "Stone Age" along with Postosuchus
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Wolf: seen starting in the "Ice Age" up to the "Modern Age"
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Update:
I have made several more animations across a few creatures, but a more finalized version of any of them would be this fellow here:
Brachiosaurus
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Due to the whiteness of his teeth his mouth looks a little off, but on a non pure white background it looks better. Also I am dying to use mesh deform on this guys animations (currently GameMaker Studio doesn't support this feature), and I may take the time to make another file just so I can anyway for the effects, I can do more dynamic shoulder and neck morphing then layering images to achieve a similar effect. Super excited for all the future stuff I will be-able to accomplish with Spine!