Strange bones in Unreal sceleton

[anonymous_user_cc52fb42]

Hi! I’m now working with animations, and i’m confused a little with default Unreal skeleton: skeleton, that could be used for root motion animations should have special root bone, but, the “default” Unreal engine skeleton, have a lot of strange, unused bones:

This makes creation of animation very difficult, but looks like i have no choice if i wanna start with existed animations from Mixamo, for example - cause thay all have this bones. For what are these bones?

[Black_Phoenyx]

Those are the Inverse Kinematics or IK Bones that should all start with the prefix IK_ and they are used by the engine for the IK movement for the hands and feet.

This may be helpful:

IK Setups

[anonymous_user_cc52fb42]

Thank you!