Hello i'm a french artist,
What about interpolation sprite morphing?
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Vanilliware uses this process for their 2D animation.
Please, observe the bust of this character (or the left armband, the sword etc... ).
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He's constituted by two sprites in two slightly different angles, the one exposed to the light, the other one darker
It's a ingenious combination of free form deform mesh and interpolation morphing.
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If you add this feature to your editor... I love you !
Thank ^^