This is a FREE 3Ds Max script I developed that helps you convert from MIXAMO.com bone hierarchy to the default humanoid in Unreal Engine 4

This aims to solve the annoying task of setting the bones between both skeletons to match each others one by one in non user-friendly dropdowns.

If you don't know what I'm talking about or don't want to use 3Ds Max to do this task, you can check out this video tutorial by Cobb Dev  https://www.youtube.com/watch?v=SbC9rIRgu-A 

You can retarget from within the Unreal Engine editor and save the bone “configuration” for future skeletons, but in some cases that would be a hard to track file (may be lost in one of many projects) and may not be a good solution if you want to manually edit an skeletonand then retarget It.

This MaxScript will modify all the bone names to fit the ones UE4 human uses in just one click, adding the extra root bone mandatory by UE

Licensed under: Creative Commons: Attribution-NonCommercial-ShareAlike
CC BY-NC-SA

Hierarchy BEFORE usage

Hierarchy AFTER usage

Using this plugin still requires you to retarget the skeleton In-Engine, but they will auto-fill all the correspondency between bones automatically so you don’t need to do anything by hand.

Creative Commons: Attribution-NonCommercial-ShareAlike
CC BY-NC-SA