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This tool serves two main usages:

1,Rebuild skeleton structure after the character is animated,and keep the animation the same;
2,Batch bake and export animations.

If for some reason,after we animated the character,we need to reconstruct the skeleton to a flat hierarchy,which is,all bones are in the same hierarchy level,only under the root,this tool will come handy.

If the original skeleton structure was like obove.

It will be rebuilt to a 'flat' hierarchy as shows above,while keeping the full animation untouched,as shows below.