Modeling -> Mixamo auto rigging -> UE4 retargeting

In general, there are 3 ways we can work with the Blender-UE4 pipeline:

1	Model character	Export model	Upload to Mixamo for auto rigging	Export FBX -> Import to UE4 -> Retarget Anim
2	Download default UE4 Character blender file	Update mesh	Adjust rigging
3	Model character	Custom rig (match the bone hierarchy with UE4 mannequin)

If you want to minimaize the amount of headache and jump to UE4 programming ASAP, method 1 would save you a lot of time. (The tradeoff is that you wouldn't have custom character animation.)

https://wiki.unrealengine.com/Character_from_Blender_to_UE4

https://www.mixamo.com/

This post helped a lot. At first I wasn't able to get the mapping work, the key is that i forgot to turn on humanoid on the original skeleton of the animation.

https://docs.unrealengine.com/latest/INT/Engine/Animation/RetargetingDifferentSkeletons/

Technical artist talks about the Blender-UE4 flow (this is from 2015.1, many things have been changed; but as you can see the settings are very tricky)

https://forums.unrealengine.com/unreal-engine/events/26899-support-stream-%E2%80%93-blender-animation-ue4-%E2%80%93-jan-13th-2015?56101-Twitch-Support-Stream-%E2%80%93-Blender-Animation-amp-UE4-%E2%80%93-Jan-13th-2015=

The Youtube link for part I
https://www.youtube.com/watch?v=Ayp1lof0RJU&index=1&list=PLZlv_N0_O1gbggHiwNP2JBXGeD2h12tbB

Another video for retargeting anims

https://docs.unrealengine.com/latest/INT/Videos/PLZlv_N0_O1gbwdyIm78w42fZ1t8dDClsI/xy9aLbZLdeA/

Add root bone to Mixamo character. This might not be necessary since we can leave the root selection box to 'None'.

https://www.youtube.com/watch?v=_QpDGNgg7IA