Is animation source required for retargeting?

Development Character & Animation
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1

First of all, I pay my respects to all the engineers and artists here.
We’re trying to create a Virtual Character.
using the motor of the optitrack
I’m going to retarget from UE4.

  1. In UE4, should retargeting have an animation source?
  2. I think the process of dynamic data > human skeleton > character skeleton retargeting will allow the output to match the ratio of the character. Please give your opinion.