An easy to set fat compound.
1: get an animated mesh
2: duplicate it, freeze the new mesh, put a weight map on it and paint fat.
3: connect the fat compound and set the values
4: enjoy

Inspired from Todd Akita's video: Ice Springs
vimeo.com/1743232

edit:
For those who wants it: area.autodesk.com/downloads/scripts/ice_fat_compound

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