I made an extension for the Unity 2DAnimation Package that allows scripts to access and modify to each individual Vertex Position.
Using this, I wrote a basic FFD script and a basic vertex mover:
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Here’s the full source of everything you need to get this to work on github:
https://github.com/democore/UnityVertexModify2D
Sadly, the only way I found to make this work is to replace the 2DAnimation package with a custom one that exposes the vertex data.
Hope this can be of help! c: