How to scale the model's sub items on the Y-axis so that the model always stays close to the bottom, and how to calculate the difference between the model and the bottom of the model? thanks

Questions
1

How to scale the model’s sub items on the Y-axis so that the model always stays close to the bottom, and how to calculate the difference between the model and the bottom of the model? thanks

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https://playground.babylonjs.com/#UVVJA7

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Looks like the pivot is off in the mesh as scaling would move it even more:

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The simplest is to rebuild/move it in 3d tools and reexport.

Other wise you can try adding an extra transform in the hierachy to offset it and finally you could use a pivot in Babylon.

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When scaling the sub item model, I tried the algorithm closely at the bottom of the model for a long time, but it still didn’t work. Can you give me some specific ideas or demos

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As I mentioned you should either rely on the set pivot function or insert a new node in the hierarch if you can not update the mesh (despite this being the mist efficient way)