What is the principle of this change in body shape? How to achieve this change in Babylon?

hi. you can deform body parts with bones https://doc.babylonjs.com/How_To/How_to_use_Bones_and_Skeletons and small things as shape of ears and other small details with morph meshes Use Morph targets - Babylon.js Documentation
The principles for deforming organic models are the same as in any other character workflow. animation of bones in something like maya, export in gltf and drawing mesh states in something like zbrush and retop models with normals baking for use in morphtargets and custom shader for smooth transition of material maps. and use all this parts for your app. similar demo making in threejs three morphing
the process of creating character animation is quite complicated and I can not describe it in one post

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