I can’t think of any way to do this that isn’t going to be tedious. The issue comes with you wanting the pieces to change shape, then come back together.
You’d want to do it on a precomp so that you can change the images without having to go through many layers to fix them all in case you need to adjust the images used.
There may be a script out there that makes a bunch of random masks on a layer, but adapting that into a way of making each piece’s shape shift? Not that I can think of.
Okay, here’s my idea.
Make the first mask shapes you want to use on your precomp.
Duplicate the precomp as many times as you have pieces.
On each layer, delete all the masks but one until you have each layer being only one piece.
Move the anchor point for each piece to the center of the masked shape (or wherever you want the rotation to be centered.
Make all the layers 3d and tie the rotation parameters all to a controller layer’s rotation parameters.
Keyframe the rotation for each transition.
Then put keyframes for mask shape on the beginning of a transition point for each piece, go to the end of the transition point and change each mask to be the new shapes you want.
Repeat that last step for as many transitions as you have.
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