Keep the floor under foot?

How to keep the ground under the feet after the height change of dude ?
I want to constantly change the ground position through miny and proxy, but I don’t know the miny and proxy after the bone changes

You could probably rely on the pivot ? Set and Use a Pivot - Babylon.js Documentation

but i hope change the dude position y achieve my goals ,because dude walk the gound do not move

I hope when dude walk the ground dont move

Maybe in your case cause axis are aligned, you could rely on the bounding box instead of reading vertices data ?

Actually we read them to create the bounding boxes.

I dont understand create the bounding boxes then how to ensure that people are always on the ground ?premise the dude skeleton bones scaling